Some standard content:
Military Standard of Electronic Industry of the People's Republic of China FL0182
Released on 2003-12-15
SJ208902003
Treatment and painting of electronic equipment
Implementation on 2004-03-01
Before approval by the Ministry of Information Industry of the People's Republic of China
This standard was proposed by the Technical Committee on Process Standardization of the Ministry of Information Industry and must be approved by the Fourth Institute of Electronics of the Ministry of Information Industry. Introduction
The drafting position of this standard is: the Eighth Research Institute of China Electronics Technology Group Corporation. The main drafters of this standard are: Gong Guangfu, Cao Rong, Hu Huihua, Sun, and Zhang Bingguang.-iKAoNhiKAca=
SJ20890—2003
1 Scope
Treatment and coating of electronic equipment
This standard specifies the technical requirements and process methods for the pre-treatment, surface modification and coating of military electronic equipment. The technical standard is applicable to the production and maintenance of electronic equipment. 2 Referenced documents
SJ20890-2003
The relevant provisions of the following documents become the provisions of this standard through reference. For referenced documents with date or edition number, any subsequent amendments shall apply. The single version (excluding the contents of errata) or revised version is not applicable to this standard, but it is recommended to use it! The parties to this standard explore the possibility of using the latest version. For documents without date or edition, the latest version shall apply to this standard. GB/T1730 Determination of paint film hardness test GB/T1743 Determination of paint film gloss GB/T1764 Determination of paint film thickness G3/I6739 Determination of paint film smoothness by pencil method GB/T8013 Aluminum and aluminum alloy anodizing: General specification of anodized film Coating performance Rust grade and rust removal grade of steel surface GB/T8923 Chromate conversion coating of electroplated zinc and electroplated zinc layer GB/T 980
GB/T 11376
All phosphate conversion coatings
Evaluation of surface quality of steel before paintingGB/T 13288
GB/T 17460
Chemical conversion coatings Chromate conversion coatings on aluminum and aluminum alloys8 Color of camouflage paint films
GJB 798
GJB1888
GJB 4004
Specification for anti-visible light near infrared solvent-based camouflage coatings for land combat equipment deformation camouflage pattern deletion
SJ/T10674—1995 Technical conditions for coating general coating Standards for surface before coating—acid precipitation
JR/T6978
QI467 Technical conditions for pickling and passivation of stainless steel Technical conditions for chemical oxidation film of magnesium alloy
Technical conditions for passivation film of copper alloy
3 Terms and definitions
The following terms and definitions apply to this standard. 3.1 Pretreatment pretreatment
The surface to be coated is treated by degreasing, sandblasting, grinding and other steps to become a surface that meets the requirements of coating, is clean and has a certain roughness.
3.2 Surface modification surfaction
The process of chemical treatment, purifying, aging and other processes to improve the adhesion of the coating and enhance the protective ability. This process forms a thin layer of certain compound on the surface. 3.3 Rust-cleaningGrades To obtain a degree of cleanliness of the coated surface, commonly used paint grades such as SJ 20890—2003
3.4 Roughness
The roughness of the surface to be coated formed after sandblasting, which specifically refers to the roughness after sandblasting, and is different from the roughness after sandblasting! , different from the rough surface state formed by the war, it is a high density of anti-corrosion points, thicker surface, which is conducive to the formation of inlay parts with benefits.
4 Requirements
4.1 Processing and coating process route
The process route required for the treatment and coating of the sub-equipment is as follows: Pretreatment
Table M
4.2 Pretreatment
4.2.1 Degreasing
4.2.1.1 Degreasing requirements
The degreasing work of the paint surface should meet the requirements of the table, and the degreasing and standardization
Compared with chemical oxidation, smell:
and chemical chemistry
Avoid (including phosphating paint)
Table 1 Degreasing quality requirements
Old oil quality level
4.2.1.2 Oil removal method
When the surface film is cracked, the following methods can be used to complete the removal
No leakage
Organic solvent removal: organic solvents such as gasoline, enzymes, diphenyl, etc.: usually use old 1 technology to scrub or wash; it has the ability to dissolve saponifiable grease and non-saponifiable grease, generally does not corrode, although the oil removal is large and the speed is fast, it is not easy to be thorough. The commonly used oiling methods before painting:
Emulsified degreasing: commonly used! The materials are mainly surfactants, such as detergent, laundry powder, detergent powder, metal detergent, etc.: The main methods are: rinsing: the oil removal is more thorough, aqueous cleaning, safe: the oil removal is small, the speed is slow: chemical and electrochemical oil removal: using heated sodium hydroxide, sodium carbonate, sodium phosphate and other wet solutions; commonly used: no immersion cleaning, electrolytic cleaning: the characteristics are more thorough removal, high efficiency, but it is corrosive to zinc, aluminum and other metals, and the residual liquid has cracks or micro-holes, which is easy to cause later corrosion. Mainly used for electroplating and phosphating pretreatment. The formula and process of Changchuan chemical degreasing are shown in Table 2; E4
-iKAoNiKAca=
Formula leather art
Nazco,
NagPO4
Nasio;
OP emulsifier
40~-50
20 --30
80~-90
Muzhu degreasing
Common chemical degreasing formula and process examples
Aluminum and aluminum composite
40·50
40--60
Gold oil removal and
and Zhao composite
10--15
20~-30
50---70
70 -- 81)
Until the turbidity is gone
SJ 20890—2003
Iron and magnesium alloys
60~·80
Until the turbidity is gone
High temperature degreasing: For castings or micro parts soaked with grease, the injected oil can be removed by heating method (about 3℃). The carbon deposits on the surface can be removed by grinding or sandblasting. For castings with high temperature, they can be cleaned with steam first, and then heated to 100~200℃, and repeated until there is no oil seepage in the pores. This method is more tedious and is generally used when other methods cannot be implemented: After degreasing, the surface should be free of oil stains, marks, dust and other residues: 4. 2. 2 Rust removal and roughening
Rust removal and roughening requirements
4. 2. 2.1
After sandblasting and roughening, the surface to be painted shall meet the requirements of Table 3. The manual rust removal shop shall meet the requirements of Table 4. Table 3 Sandblasting rust removal degree classification and roughness
Sandblasting degree
(light spray)
(degree)
Sa21/2
【Bottom sand
There should be no visible grease and dirt on the surface, and there should be no adhesion The oxide scale, iron and paint coating and other attachments are not visible on the surface, and the oxide scale, iron rust and paint coating have been basically removed. The total residue should be a small amount. The oil, dirt, oxide scale, rust and paint coating that are visible in the light should be only dots or stripes. The surface roughness Rz
25-~40
25 ~~60
Slight single bottom
Certificate can be found flying Shanzhang, dirt, oxidation zone, rust and sea paint -0--80
(spray phenol) "layer and other removal objects, the surface shows the color and luster of the groove. Table 4 Manual rust removal degree classification
Manual risk transfer degree
Slight risk rust:
Suitable for the following areas
Only suitable for pre-painting treatment and pre-welding cleaning and spraying treatment with low requirements
Suitable for pre-painting treatment
Pre-weather treatment, Also the company
hot zinc spraying pre-treatment
"avoid the eye and the spraying state and other
, the long show the requirements of the anti-repair treatment brand
the table Wu out of the three and the history of pollution. No representative of the South people fast oxidation, desire and paint long and other things
the table has no visible active pollution, has not maintained the oxygen content, read the embroidery paint coating and other things, except for the summer inquiry bottom, the bottom of the star Ying department only the gold strong gloss to supplement the flow installation
the main cost time is not complete
the family table Xianshan paint
SJ 20890-2003
4. 2. 2. 2
Rust removal and roughening methods
Rust removal and granulation are generally completed by "sand blasting method: use compressed air to carry the workpiece at high speed and spray it on the workpiece to remove the solid matter on the workpiece surface. The surface roughness of the workpiece can be roughened by the type, length, shape and process of the spraying material. According to different needs, appropriate abrasives and process methods are selected to obtain a surface with different roughness. See Table 5 for examples of spraying technology. Table 5 Example of sandblasting process
Sandblasting
Parts of hot spraying
Parts of hot spraying
Stainless steel paint
Fushu sandblasting
People's paint
Gold, right member, etc.
Various abrasives
Various abrasives
Corundum. Rong
Work, have English
.5 - 2
0.35 -0.5
0.25·0.35
0.25~ 0.35
Rust removal degree
Sa2 1/2
Table sugar degree R2
40 --80
25 --60
25 - 40
Before sandblasting, the surface should be cleaned with steam. No dirt: The spray carrier should not carry grease, dirt and other substances that may pollute the surface.
Easy to: Protect the damaged surface (such as long push, precision fitting surface, thread, thin plate with thickness less than 1.5mm, etc.) from sandblasting. Detailed product test: Confirm that the work is feasible. Sandblasting should only be carried out with protective equipment to ensure the safety of personnel and the environment. Do not spray in open conditions. Hand (machine) grinding: Use tools such as shovel, power wire, power sandpaper Disc or grinding wheel, etc., before rust removal, first remove the dirt, remove the dust and debris on the surface, and wash the hub to remove rust: Washing and rust removal should comply with the provisions of JB/T6978. This method mainly uses salt, sulfuric acid, phosphoric acid and other solutions to soak the parts to remove surface oxides. It is usually carried out in the car. For high elastic hook parts (HRc 40), there is a potential problem of oxygen embrittlement. Acid is easily retained in micropores and gaps. Therefore, these two situations are not suitable for pickling. 4.3 Surface modification
4.3. 1 Requirements for surface modification
Through chemical or chemical reaction, a stable dielectric layer is formed on the metal surface, and the surface properties should meet the requirements of Table 6. Table 6 Requirements for surface modification
Metal and alloy bzxZ.net
Stainless steel
Derivatives and alloys
4.3.2 Precautions in the process
Chemical oxidation (oxidation)
Electrochemical oxidation (oxidation)
Chemical oxidation (passivation)
Chemical oxidation (oxidation)
Chemical oxidation (oxidation)
Surface modification does not need to be repeated: For example, the surface of the chemical shop should not be phosphated: Technical
GHF[17460
G1TT 8013
GB/T9800
GB/T 11376
The modified surface is easily contaminated and affects the bonding force of the paint film. Special attention should be paid to keeping it clean: "The aluminum surface oxide film of the paint should usually be an acid anodic oxide film and an ordinary sulfuric acid anodized film: -iKAoNiKAca-
SJ 20890-2003
The baking temperature of the chemical oxide film of aluminum, magnesium, and copper is not higher than 60℃, and the baking temperature of the painted surface is not limited by the specific temperature. When local surface redness is required to be painted, do not choose a baking type coating. The coating is generally not primed. The baking temperature of the anodic oxide film on the aluminum surface is generally not higher than 150°C. The baking humidity of the coating is limited by this temperature. The aluminum structure of the aviation structure is made of aluminum. Considering the temperature that the material itself can withstand, the phosphating film is also a good paint base. Phosphating is usually done in the interior. If it is not possible, X-1 (phosphating paint) can be used instead of phosphating in the tank. The quality of the phosphating film is worse than that of the phosphating film in the tank. The reasonable matching of pre-treatment, surface modification and coating can finally achieve the desired effect. Unless otherwise specified by the manufacturer, the pre-treatment and surface modification process can be selected according to Table 7. Table 7 Common pre-treatment and surface modification processes. Electrochemical injection, surface modification, surface modification, coating ... ||Renji Qichushan
Chemistry, Wei Chemical Cai method
Chemistry, and chemical degreasing
Jiangji Yanchushan
Pi Jiangchushan
Chemistry, white chemical degreasing
(limited solvent degreasing
Chemistry, good chemical Xu Ni
Beixue, electrochemical degreasing
Pot surface, maintain surface serum treatment
Magnesium decay
3 Zinc surface
According to the surface condition, the surface of the material is coated with 4.5 chemical and electrochemical degreasing. There are solvent degreasing methods, electrochemical degreasing has porous agent degreasing, and later, the suitability must be considered and then the organic solvent (such as gasoline) is used for degreasing. 4.5.1Coating system
Acid rust removal
Carbon sand treatment
Sand treatment
Hand polishing
Spray coating
Surface modification
Slot phosphating
X06-1 Ethylene male paint
: X0G-1 Ethylene phosphating primer
Cationic oxidation
Chemical oxidation (including room oxidation)
X06-1 Ethylene phosphating low paint
X06-1 Ethylene phosphating primer
X06-1 Ethylene phosphating primer
X06-1 Ethylene phosphating primer
Inner phosphating
Chemical oxidation
X06-1 Ethylene phosphating primer
Manual grinding or X06-1 ethylene phosphating primer or chemical Yao chemical
Ethylene T grinding
Fine sandblasting
Chemical roughening, plasma treatment
Consideration system than belt for anti-corrosion, dense alcohol
Degree use main indoor special parts management
Often matched with rich sample primer machine, a large car structure belt piece for repair and maintenance
Required (not with paint type
Commonly used for clothing with summer requirements The surface of the oxide film is generally added to the surface of the large-scale production of aluminum castings, aluminum castings, and fiberglass expansion. There are large structures that require no painting and require varnish. Generally, the varnish base is used. Generally, only the varnish base is changed. Generally, it is used as an active varnish base - generally used for foaming varnish base and matched with varnish, etc., which can be directly sealed to improve the disease resistance. tt||Generally only the base coat is made. To match with white type 10 paint, the material must be suitable for the paint. The coating system is divided into two layers: primer, middle coat and top coat. The coating thickness of each layer is determined by the material and process. One or more coats can be completed. For indoor decoration, you can apply middle coat: 4.5.2 Primer
Choice of primer for black metal surface Paints containing zinc phosphate, aluminum tripolyphosphate, powder, etc. that have a stabilizing effect or electrochemical protection effect on the metal surface: For non-ferrous metal (including plated coating) surfaces, you can choose a primer containing zinc yellow, strontium yellow, barium, etc. that can act as a filler for the metal surface and passivation: such as epoxy anti-rust paint, epoxy amide paint, polynitrogen primer, and acrylic polyurethane primer containing the above fillers: 4. 5.3 Intermediate paint
You can choose a coating containing anti-penetration flake materials such as mica varnish, zinc flakes, or a low-porosity high-solid paint, such as epoxy micaceous iron, epoxy zinc flakes, five-solvent cyclic thick paste paint, etc. Attention should be paid to the compatibility of the primer. For coating, the user can choose not to apply intermediate paint. 4.5.4 Topcoat
The color and gloss of the topcoat can be determined according to the requirements of the manufacturer. It is specified in the technical agreement: There are many types of topcoats, such as acrylic paint, acrylic urethane paint, amino baking paint, etc. The selection should be based on the requirements of the user. If there is no requirement, it is recommended to use acrylic polyurethane paint. The selection of topcoat should pay attention to the compatibility with the intermediate paint or primer. 4.5.5 Application of coating system Common coating systems can be selected according to Table 8. Table 8 Selection of common coating systems Selection conditions Contains iron red, aluminum powder, carbon dioxide, etc., oxygen polyurethane anti-rust paint, ammonia anti-rust primer, etc. Contains yellow, yellow, planing yellow and other paints. Use oxygen glue to float the bottom: Generally, people use the bottom to roll the bottom, which can be extended for a period of time.
Primer - Use bottom float, you can also use primer according to the coating process requirements, intermediate paint containing iron oxide, phosphorus flakes and other flake fillers, primer and left solvent epoxy paint, etc., paint containing iron oxide, zinc flakes and other flake fillers and three solvent bad oxygen paint, etc., various types of olefin polyurethane paint must be used: ether paint, hydrophenylene resin, olefin acid, cross Chloro-olefin paint, etc., various acrylic acid urethane lacquers, base resin paint, acid lacquers, etc., various color resin thin polyurethane lacquers, hydrogen emulsion paint, acrylic acid paint, nitrocellulose lacquers, etc., various color acid nitrogen ester lacquers, solid-base resin paint, free-range lacquers, etc., must be fully treated before painting to avoid residual hydrogen gene Resin paint, acid-formaldehyde paint, etc. Remember to use special paint (thickness 0.5mm, each wire pressed olefin polymer composite paint, recommended to store illegal crown paint, fully hit or use the cloth, radiation and inevitably make a light Bin one, and then select and treat according to the requirements of 4.2 and 4.3 to obtain a suitable surface for coating. Before coating, the surface to be coated must be kept small and clean: the bare steel is easy to be induced, therefore: the surface after the single treatment should be modified as soon as possible with a paint, the shorter the better, after spraying, the next day (the interval time should not exceed 6, the time can be suitable for people). 4: The time for people or tides should not exceed 2: When the original surface of the original technology is obviously deteriorated due to pressure, the amount of spraying should not be moved; Aluminum surface and barrier electrode ammonia language, require no uniform pore thickness, primer: The zero after electrode preparation should be kept free of pollution before coating, avoid rubbing, contact, friction and damage, otherwise it may damage the replacement film and cause the paint time difference to be low. It will be very polluted in one day. "Generally, the primer is required to be applied within 24 hours. If the collection is properly maintained, the chain length can be up to 72h: More than 72h or two bags of paint pores should be treated, and etching should be done before coating: Note: For The etching of the polar oxide film can be made by chemical oxidation: passivation, the film should be low-blocking, clear, shiny, and free of stains before painting, and should be resistant to color irritation, friction, and machine operation. Paint the primer early; generally, it is required to apply the primer within 24 hours. If it is protected, it can be extended to 72 hours. If the surface is seriously polluted and the active film is damaged, it should be repaired according to the requirements of 31: If the surface is not slightly polluted, the surrounding area of the modified film can be cleaned with steam injection to remove the oil stains. Fingerprints and traces should be removed with a fine scrub or detergent. Primer: Low-density lacquer, low-density lacquer, and primer. Each layer of paint usually consists of two coats. Each coat of paint can be rubbed once (the same layer of paint can also be rubbed between each coat according to the technical requirements. This can reduce the problems of chemical reaction, flow retention, etc.): The thickness of the middle coat depends on the type of paint. Please refer to the paint instructions for use. The total thickness of the paint should be three times the surface roughness. Generally, the equipment is not greasy or less greased before painting. Indoor equipment can be cold-installed before installation. The putty that matches the product should not be more than 0.5mm
There are many types of metal materials, and the surface coating is more special. The selection of coatings and processes generally needs to be demonstrated through experiments: ABS plastic h)
Bevel parts can choose special plastic paint or internal acrylic polyurethane paint. The workpiece should eliminate stress before coating and remove the release agent: The surface of the polymer material needs to be granulated and it is best to use a peelable cloth during molding or sandblasting after molding, also called hand-blasting: The maintenance needs to remove the bad paint layer, and the sandblasting treatment is more thorough. The residual remover should be carefully removed, and the local maintenance is more convenient for "handling. The coating shall be consistent with the original design; micro-coating, deformation camouflage coating design of equipment shall comply with the requirements of GJB4004, and the patterns of different products and different parts of the same product shall not be the same; the coating used shall comply with the requirements of G1888. Camouflage coating is not formed on the surface of normal coating! The thickness of the topcoat of the coating shall be appropriately reduced; the heat dissipation surface is generally not painted, and the heat-generating surface of the automobile bracket (tube) that requires painting can be coated with organic silicon heat-resistant paint. The paint should be able to withstand heat. 4.5.7 Coating quality requirements 4.5.7.1 Coating color There is no obvious color difference compared with the standard color plate, and there is no obvious color difference between the same platform or the same batch of products 4.5.7.2. The gloss of coating
shall meet the requirements of design and coating product specifications. The gloss of the same platform or batch of products shall be uniform. 4.5.7.3. Appearance defects of coating
The appearance of coating shall meet the requirements of grade I, II, IIIII and V in 3.3.1 of SJ/T10674-1995. 4.5.7.4. Coating adhesion
) Scraping method: After the scraping test, the scraped coating shall be broken into pieces, and the broken coating shall not have flaky agent falling off: b) Cross-cut method: After the cross-cut method inspection, the coating without greasy layer shall be greater than or equal to grade 12, and the coating with greasy layer shall be greater than or equal to grade 3. 4.6.7.5. Coating thickness
The thickness of the coating shall meet the requirements of product design and process documents. 4.5.7.6 Coating camouflage characteristics
a) Tree spot color: In addition to complying with other regulations, the color of camouflage spots shall comply with the provisions of GJB798: b) Spot shape: It shall be composed of linear circles and shall be asymmetrically arranged, and shall comply with the requirements of G3B4004 c) Painting requirements. After painting, the variation in length and width of a single spot shall be within ±0.05m, and the offset of the wheel fan line position shall be within ±0.10m: The variation in the proportion of each color shall be within ±5%. There should be no defects such as coating flow, biting, coating shedding, color misalignment, etc.
4.5.7.7 Surface hardness of coating
The surface hardness of coating should be consistent with the hardness index of varnish. 4.5.7.8 Coating system
The coating system should be consistent with the technical requirements specified in the design drawings, technical documents or contracts. 5 Inspection method
SJ 20890—2003
5.1 Degreasing
5.1.1 Water film rupture time test
Moisten the surface of the product to be inspected with steam water, then let it stand for half an hour, and record the time when the water film is broken. 5.1.2 Oil stain test on filter paper surface
Put 2-3 drops of steam on the surface of the product to be inspected and keep it for 15 seconds. Then take a piece of filter paper and stick it to the surface of the inspected part. At the same time, take a piece of filter paper and add 1.2~3 drops of gasoline. After the gasoline on the two filter papers is completely evaporated, compare the oil pollution degree of the two filter papers under the presence of diffuse light. 5.2 Rust removal and roughening
Rust removal shall be tested according to the method of GB8923 or compared with standard rotten plates: roughening shall be tested according to the method of GBT13288 or compared with standard sample plates.
5.3 Coating color
5.3.1 Test conditions
The light is neutral gray, such as: ambient environment with diffuse H light or 40W fluorescent lamp; the visual acuity and color vision of the inspectors are usually: visual path 0.5 m-~ 1.0 m.
5.3.2 Test method
a) Compare the standard color plate and the color-free plate with the inspected plate (when there is no color difference sample, the standard color plate can be used for comparison alone); b) Put the samples or products to be inspected together for comparison; c) Put the inspected sample or product and the standard sample side by side and compare them by touch to improve the identification ability. If necessary, reverse color difference analysis can be performed to reduce human error. 5.4 Coating gloss
Inspect according to the method of GB/T1743. Or old standard sample and the tested coating are compared under the same lighting conditions. 5.5 Coating appearance defects
5.5.1 Test conditions
Large diffuse light environment or 40WH fluorescent lamp: Inspector’s vision and immunity: Viewing distance 0.40.5m 5.5.2 Test method
a) Grade I coating: Do not change the incident direction and observation angle of light to achieve the best identification conditions: Repeatedly check and evaluate the degree of coating surface defects
h) Grade I, II, V coating: Inspect and evaluate the degree of coating surface defects in the normal direction of incident light and reflected light 5.6 Coating adhesion
5.6.1 Test samples
The test samples can be the coated products, special parts or parts that have been changed due to other reasons such as phosphating, material composition, heat treatment, etc. After approval by the purchaser, the test samples can also be made of standard test plates made from materials and tested products or product parts. The treatment and coating processes of each test sample should be alternate with those of the products or product parts. 5.6.2 Test method
a) Tongue cutting method
When using a sharp blade to cut the typical (not obvious) position of the coating on the test sample, the coating quality should be: the coating should not be crisp and flaky, and the coating should be close to the substrate. b) The test sample should be coated with a sharp blade. Method
Use a special multi-blade machine (can be replaced by a three-blade machine) on the coating surface, according to the grade of horizontal and horizontal intervals, the cut line is divided into 25 squares
The grid is 30° with the coating, the moving parts are stable: the cutting depth reaches the machine surface, and it cannot cut into the right square: the side length of the square is related to the coating thickness, and the special requirements are as follows: the coating thickness is less than 100μm, the grid length is 1mm--1.6mm, and the thickness is more than 100μm: the grid side K1.6mm2.4mm-iiKAoNhiKAca=
Table 9 Grading of adhesion inspection by cross-cutting method
The cross-cutting line will avoid the edge of the cross-cutting line, and the cross-cutting line will be affected by less than 1% of the cross-cutting line. SJ20890—2003
The coating has fallen off along the edge of the system and the machine may not have more than 5% of the entire coating. I estimate that there are bands or fat falling off and (or) the whole part or the whole piece falling off. The affected area is greater than 35%.
The coating has fallen off along the edge of the system and the whole piece has fallen off. It can affect your blood accumulation. The degree of shedding is greater than 65 at level 65.
After pressing the tape on the engraved pattern, and after the bubbles are driven out, place the sample for 1min2min, and quickly peel off the tape from the tested layer at the unbonded end. During the peeling process, the tape should be 180 degrees back to back: the classification after the experiment is shown in Table 9.
Note: The tape used for the test is 1: If the width is 2.5cm, the separation strength should not be less than 500 g/cm: 5.6.3 Sample treatment
For the test samples that pass the inspection, the damaged parts of the coating are repaired, and the ordering party representative is satisfied and delivered according to the contract. The test samples with unqualified coating adhesion can be sent for inspection again after re-coating. 5.7 Coating thickness
The coating thickness is tested according to the method of GBT1764, and the dry film thickness of the coating is measured at several different parts of each test sample. 5.8 Coating camouflage characteristics
Use daily test method to compare with design drawings and standard color plates. When the ordering party has requirements, it can be tested in a laboratory approved by the ordering party.
5.9 Coating surface hardness
Coating hardness is tested according to the method of GB/T6739 or GB/T 1730. 5.10 Coating system
Compare with the technical requirements in the design drawings, process documents or contracts. 92~3 drops of gasoline, wait for the gasoline on the two filter papers to completely evaporate, and compare the oil pollution of the two filter papers under the presence of diffuse light. 5.2 Rust removal and roughening
Rust removal should be tested according to the method of GB8923 or compared with standard rotten plates: roughening should be tested according to the method of GBT13288 or compared with standard sample plates.
5.3 Coating color
5.3.1 Test conditions
The light is neutral gray, such as: ambient environment with diffuse H light or 40W fluorescent lamp; the visual acuity and color vision of the inspectors are usually: visual path 0.5 m-~ 1.0 m.
5.3.2 Test method
a) Compare the standard color plate and the color-free plate with the inspected plate (when there is no color difference sample, the standard color plate can be used for comparison alone); b) Put the samples or products to be inspected together for comparison; c) Put the inspected sample or product and the standard sample side by side and compare them by touch to improve the identification ability. If necessary, reverse color difference analysis can be performed to reduce human error. 5.4 Coating gloss
Inspect according to the method of GB/T1743. Or old standard sample and the tested coating are compared under the same lighting conditions. 5.5 Coating appearance defects
5.5.1 Test conditions
Large diffuse light environment or 40WH fluorescent lamp: Inspector’s vision and immunity: Viewing distance 0.40.5m 5.5.2 Test method
a) Grade I coating: Do not change the incident direction and observation angle of light to achieve the best identification conditions: Repeatedly check and evaluate the degree of coating surface defects
h) Grade I, II, V coating: Inspect and evaluate the degree of coating surface defects in the normal direction of incident light and reflected light 5.6 Coating adhesion
5.6.1 Test samples
The test samples can be the coated products, special parts or parts that have been changed due to other reasons such as phosphating, material composition, heat treatment, etc. After approval by the purchaser, the test samples can also be made of standard test plates made from materials and tested products or product parts. The treatment and coating processes of each test sample should be alternate with those of the products or product parts. 5.6.2 Test method
a) Tongue cutting method
When using a sharp blade to cut the typical (not obvious) position of the coating on the test sample, the coating quality should be: the coating should not be crisp and flaky, and the coating should be close to the substrate. b) The test sample should be coated with a sharp blade. Method
Use a special multi-blade machine (can be replaced by a three-blade machine) on the coating surface, according to the grade of horizontal and horizontal intervals, the cut line is divided into 25 squares
The grid is 30° with the coating, the moving parts are stable: the cutting depth reaches the machine surface, and it cannot cut into the right square: the side length of the square is related to the coating thickness, and the special requirements are as follows: the coating thickness is less than 100μm, the grid length is 1mm--1.6mm, and the thickness is more than 100μm: the grid side K1.6mm2.4mm-iiKAoNhiKAca=
Table 9 Grading of adhesion inspection by cross-cutting method
The cross-cutting line will avoid the edge of the cross-cutting line, and the cross-cutting line will be affected by less than 1% of the cross-cutting line. SJ20890—2003
The coating has fallen off along the edge of the system and the machine may not have more than 5% of the entire coating. I estimate that there are bands or fat falling off and (or) the whole part or the whole piece falling off. The affected area is greater than 35%.
The coating has fallen off along the edge of the system and the whole piece has fallen off. It can affect your blood accumulation. The degree of shedding is greater than 65 at level 65.
After pressing the tape on the engraved pattern, and after the bubbles are driven out, place the sample for 1min2min, and quickly peel off the tape from the tested layer at the unbonded end. During the peeling process, the tape should be 180 degrees back to back: the classification after the experiment is shown in Table 9.
Note: The tape used for the test is 1: If the width is 2.5cm, the separation strength should not be less than 500 g/cm: 5.6.3 Sample treatment
For the test samples that pass the inspection, the damaged parts of the coating are repaired, and the ordering party representative is satisfied and delivered according to the contract. The test samples with unqualified coating adhesion can be sent for inspection again after re-coating. 5.7 Coating thickness
The coating thickness is tested according to the method of GBT1764, and the dry film thickness of the coating is measured at several different parts of each test sample. 5.8 Coating camouflage characteristics
Use daily test method to compare with design drawings and standard color plates. When the ordering party has requirements, it can be tested in a laboratory approved by the ordering party.
5.9 Coating surface hardness
Coating hardness is tested according to the method of GB/T6739 or GB/T 1730. 5.10 Coating system
Compare with the technical requirements in the design drawings, process documents or contracts. 92~3 drops of gasoline, wait for the gasoline on the two filter papers to completely evaporate, and compare the oil pollution of the two filter papers under the presence of diffuse light. 5.2 Rust removal and roughening
Rust removal should be tested according to the method of GB8923 or compared with standard rotten plates: roughening should be tested according to the method of GBT13288 or compared with standard sample plates.
5.3 Coating color
5.3.1 Test conditions
The light is neutral gray, such as: ambient environment with diffuse H light or 40W fluorescent lamp; the visual acuity and color vision of the inspectors are usually: visual path 0.5 m-~ 1.0 m.
5.3.2 Test method
a) Compare the standard color plate and the color-free plate with the inspected plate (when there is no color difference sample, the standard color plate can be used for comparison alone); b) Put the samples or products to be inspected together for comparison; c) Put the inspected sample or product and the standard sample side by side and compare them by touch to improve the identification ability. If necessary, reverse color difference analysis can be performed to reduce human error. 5.4 Coating gloss
Inspect according to the method of GB/T1743. Or old standard sample and the tested coating are compared under the same lighting conditions. 5.5 Coating appearance defects
5.5.1 Test conditions
Large diffuse light environment or 40WH fluorescent lamp: Inspector’s vision and immunity: Viewing distance 0.40.5m 5.5.2 Test method
a) Grade I coating: Do not change the incident direction and observation angle of light to achieve the best identification conditions: Repeatedly check and evaluate the degree of coating surface defects
h) Grade I, II, V coating: Inspect and evaluate the degree of coating surface defects in the normal direction of incident light and reflected light 5.6 Coating adhesion
5.6.1 Test samples
The test samples can be the coated products, special parts or parts that have been changed due to other reasons such as phosphating, material composition, heat treatment, etc. After approval by the purchaser, the test samples can also be made of standard test plates made from materials and tested products or product parts. The treatment and coating processes of each test sample should be alternate with those of the products or product parts. 5.6.2 Test method
a) Tongue cutting method
When using a sharp blade to cut the typical (not obvious) position of the coating on the test sample, the coating quality should be: the coating should not be crisp and flaky, and the coating should be close to the substrate. b) The test sample should be coated with a sharp blade. Method
Use a special multi-blade machine (can be replaced by a three-blade machine) on the coating surface, according to the grade of horizontal and horizontal intervals, the cut line is divided into 25 squares
The grid is 30° with the coating, the moving parts are stable: the cutting depth reaches the machine surface, and it cannot cut into the right square: the side length of the square is related to the coating thickness, and the special requirements are as follows: the coating thickness is less than 100μm, the grid length is 1mm--1.6mm, and the thickness is more than 100μm: the grid side K1.6mm2.4mm-iiKAoNhiKAca=
Table 9 Grading of adhesion inspection by cross-cutting method
The cross-cutting line will avoid the edge of the cross-cutting line, and the cross-cutting line will be affected by less than 1% of the cross-cutting line. SJ20890—2003
The coating has fallen off along the edge of the system and the machine may not have more than 5% of the entire coating. I estimate that there are bands or fat falling off and (or) the whole part or the whole piece falling off. The affected area is greater than 35%.
The coating has fallen off along the edge of the system and the whole piece has fallen off. It can affect your blood accumulation. The degree of shedding is greater than 65 at level 65.
After pressing the tape on the engraved pattern, and after the bubbles are driven out, place the sample for 1min2min, and quickly peel off the tape from the tested layer at the unbonded end. During the peeling process, the tape should be 180 degrees back to back: the classification after the experiment is shown in Table 9.
Note: The tape used for the test is 1: If the width is 2.5cm, the separation strength should not be less than 500 g/cm: 5.6.3 Sample treatment
For the test samples that pass the inspection, the damaged parts of the coating are repaired, and the ordering party representative is satisfied and delivered according to the contract. The test samples with unqualified coating adhesion can be sent for inspection again after re-coating. 5.7 Coating thickness
The coating thickness is tested according to the method of GBT1764, and the dry film thickness of the coating is measured at several different parts of each test sample. 5.8 Coating camouflage characteristics
Use daily test method to compare with design drawings and standard color plates. When the ordering party has requirements, it can be tested in a laboratory approved by the ordering party.
5.9 Coating surface hardness
Coating hardness is tested according to the method of GB/T6739 or GB/T 1730. 5.10 Coating system
Compare with the technical requirements in the design drawings, process documents or contracts. 93 Sample processing
For qualified test samples, the damaged parts of the coating shall be repaired and delivered in accordance with the contract after the representative of the ordering party is satisfied. Test samples with unqualified coating adhesion can be sent for inspection again after re-coating. 5.7 Coating thickness
The coating thickness shall be inspected in accordance with the method of GBT1764, and the dry film thickness of the coating shall be measured at several different parts of each test sample. 5.8 Coating camouflage characteristics
The daily measurement method shall be adopted and compared with the design drawings and standard color plates. When the ordering party has requirements, the test can be carried out in a laboratory approved by the ordering party.
5.9 Coating surface hardness
The coating hardness shall be inspected in accordance with the method of GB/T6739 or GB/T1730. 5.10 Coating system
Compare with the technical requirements in the design drawings, process documents or contracts. 93 Sample processing
For qualified test samples, the damaged parts of the coating shall be repaired and delivered in accordance with the contract after the representative of the ordering party is satisfied. Test samples with unqualified coating adhesion can be sent for inspection again after re-coating. 5.7 Coating thickness
The coating thickness shall be inspected in accordance with the method of GBT1764, and the dry film thickness of the coating shall be measured at several different parts of each test sample. 5.8 Coating camouflage characteristics
The daily measurement method shall be adopted and compared with the design drawings and standard color plates. When the ordering party has requirements, the test can be carried out in a laboratory approved by the ordering party.
5.9 Coating surface hardness
The coating hardness shall be inspected in accordance with the method of GB/T6739 or GB/T1730. 5.10 Coating system
Compare with the technical requirements in the design drawings, process documents or contracts. 9
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