GB 5237.2-2004 Aluminium alloy building profiles Part 2: Anodised and coloured profiles
Some standard content:
ICS77.150.10
National Standard of the People's Republic of China
GB5237.2-—2004
Replaces GB/T5237.2—2000
Aluminium alloy extruded profiles for architecture
Part 2: Anodized colored profiles
Wrought aluminium alloy extruded profiles for architecturePart 2: Anodized coloredprofilesIssued on 2004-11-01
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of ChinaDigital Anti-counterfeiting
Standardization Administration of the People's Republic of China
Implementation on 2005-03-01
Articles 5.5.1 and 5.5.2 of this part are mandatory, and the remaining clauses are recommendatory. GB5237 "Aluminum Alloy Building Profiles" is divided into six parts: - Part 1: Base Materials
- Part 2: Anodized and Colored Profiles - Part 3: Electrophoretic Painted Profiles
- Part 4: Powder Sprayed Profiles
- Part 5: Fluorocarbon Paint Sprayed Profiles
- Part 6: Thermal Insulation Profiles
This part is Part 2 of GB5237.
GB5237.2--2004
This part is a revision of GB/T5237.2-2000. This revision changes the nature of the standard from a recommended standard to a mandatory standard.
Appendix A of this part is a normative appendix.
Appendix B, Appendix C and Appendix D of this part are informative appendices. This part replaces GB/T5237.2-2000 from the date of implementation. This part is proposed by China Nonferrous Metals Industry Association. This part is under the jurisdiction of the National Technical Committee for Standardization of Nonferrous Metals. The main drafting units of this part are: Northeast Light Alloy Co., Ltd., Guangdong Xingfa Innovation Co., Ltd., Guangdong Jianmei Aluminum Profile Factory Co., Ltd., Foshan Jinlan Aluminum Factory Co., Ltd., Sichuan Zhongxin High-tech Industrial Co., Ltd. The main drafters of this part are: Zuo Hongqing, Lv Xinyu, Zhang Guibin, He Yanfeng, Wu Xikun, Lu Jiyan, Wang Laiding, Wang Wenge, Li Ruishan. This part is interpreted by the National Technical Committee for Standardization of Nonferrous Metals. The previous versions of the standards replaced by this part are: -GB/T5237-1985, GB/T5237-1993 (anodized, color profiles), GB/T5237.2-2000. 1 Scope
Aluminum alloy building profiles
Part 2: Anodized, color profiles
GB 5237.2-2004
This part specifies the contract content, technical requirements, test methods, inspection rules and packaging, marking, transportation and storage of anodized and color-differentiated aluminum alloy building profiles.
This part is applicable to aluminum alloy hot extruded profiles with anodized, electrolytically colored or organically colored surfaces for use in the construction industry. Hot extruded pipes with the same purpose and surface treatment method can also refer to this part. Aluminum alloy hot extruded profiles with the same surface treatment method for other industries can also refer to this part. 2 Normative references
The clauses in the following documents become the clauses of this part through reference in this part. For all the referenced documents with dates, all the subsequent amendments (excluding the contents of errata) or revisions are not applicable to this part. However, all parties that reach an agreement based on this part are encouraged to study whether the latest versions of these documents can be used. For all the referenced documents without dates, the latest versions are applicable to this part. Method for rating ageing of paint and varnish coatings GB/T1766www.bzxz.net
GB/T2480
Ordinary abrasive silicon carbide
GB/T4957
Measurement method for thickness of non-conductive coatings on non-magnetic metal substrates GR5237.1
GB/T6461
GB/T6462
GB/T8014
Aluminium alloy building profiles Part 1: Substrate
Rating of specimens and test pieces after corrosion tests of metallic and oxide coatings Microscopic measurement method for cross-sectional thickness of anodic oxide coatings on aluminium and aluminium alloys Anodic oxidation Definition and application of anodic oxide film thickness Provisions on measuring thickness GB/T10125 Artificial gas corrosion test Salt spray test GB/T12967.4 Determination of UV resistance of anodized aluminum and aluminum alloys Anodized aluminum film Sealing quality assessment of anodized aluminum and aluminum alloys Phosphorus-chromic acid method GB/T14952.1
GB/T14952.3 Inspection method for color difference and appearance quality of anodized aluminum and aluminum alloys Visual observation method GB/T16585 Test method for artificial weathering (fluorescent ultraviolet lamp) of vulcanized rubber 3 Definitions
Decorative surfaces exposedsurfaces
Decorative surfaces refer to the surfaces that can still be seen after the profiles are processed into doors, windows and curtain walls. It includes the surfaces that can be seen when the windows, vents, doors or panels are open and closed. 3.2
Local thickness localthickness
The average value of the measured values obtained by several (not less than 3) film thickness measurements on a certain inspection surface of no more than 1cm on the profile decorative surface.
average thickness
Average film thickness
The average value of the film thickness of a certain (not less than 5) parts measured on the profile decorative surface1
GB5237.2—2004
Content of contract (or order)
The contract (or order) for ordering materials listed in this standard shall include the following contents: a)
Product name:
Brand, state:
Specification;
Surface treatment method, color and film thickness level; Dimensional tolerance accuracy level:
This standard number;
Other special requirements.
5 Requirements
5.1 Product classification
5.1.1 Brand, state, specification and surface treatment method The brand, state and specification of the product shall comply with the provisions of GB5237.1, and the surface treatment method shall comply with the provisions of Table 1: Table 1
Surface treatment method
Anodizing (silver white):
Anodizing plus electrolytic coloring
Anodizing plus organic coloring
5.1.2 Marking example
Product marking is based on the product name (anodized profiles are indicated by "aluminum oxide profile", anodized plus electrolytic coloring profiles are indicated by "electrolytic aluminum oxide profile", anodized plus organic Colored profiles are indicated by "oxidized organic aluminum profiles"), alloy grade, state, product specifications (consisting of profile code and cut-to-length), color, film thickness level and the order of this standard number. The marking example is as follows: Made of 6063 alloy, T5 state, profile code 421001, cut-to-length 3000mm, surface anodized electrolytic coloring, medium bronze color, film thickness level AA15 profile for exterior windows, marked as: exterior window profile 6063-T5421001X3000 medium bronze AA15GB5237.2-2004. 5.2 Base material quality
The quality of the base material shall comply with the provisions of GB5237.1. 5.3 Chemical composition and mechanical properties of the product
After removing the surface oxide film, the chemical composition and mechanical properties of the product shall comply with the provisions of GB5237.1. 5.4 Allowable deviation of product dimensions
The allowable deviation of product dimensions (including oxide film) shall comply with the provisions of GB5237.1. 5.5 Quality of anodized film
5.5.1 The thickness level of anodized film shall be selected according to the use environment (refer to Appendix B), and its requirements shall comply with the provisions of Table 2 and be indicated in the contract. When indicated, door and window profiles comply with AA10 grade, and wall profiles comply with AA15 grade. Table 2
Average film thickness of single piece/um. Not less than
Local film thickness of single piece/μm, not less than
5.5.2 The sealing quality of oxide film shall be tested by the phosphorus chromic acid etching loss method, and the weight loss shall not exceed 30mg/dm. GB5237.2-2004
5.5.3 The color of the oxide film of electrolytically colored and organically colored profiles shall comply with the physical standard sample and the allowable deviation agreed by the supply and demand parties. Slight color unevenness is allowed on non-decorative surfaces, and the degree of unevenness is negotiated by the supplier and the buyer. 5.5.4 The corrosion resistance of the anodic oxide film is tested by the copper accelerated acetic acid salt spray test (CASS) and the alkali drop test, and the wear resistance is tested by the falling sand test. The results should comply with the provisions of Table 3.
Corrosion resistance
Oxide film thickness level
Time/h
CASS test
Alkali drop test/s
≥100
≥123
Wear resistance
Falling sand test wear coefficient
I(g/μm)
≥300
5.5.5 The weather resistance of the oxide film is tested by the artificial accelerated aging test of 313B fluorescent ultraviolet lamp. After 300h continuous irradiation, the color difference of the electrolytic coloring film should reach at least level 1, and the color difference of the organic coloring film should reach at least level 2. The specific color difference level should be determined by negotiation between the supply and demand parties according to the different colors.
5.6 Appearance quality
The product surface is not allowed to have defects such as electric burning, oxide film shedding, etc. that affect the use. It is allowed that there is no film or electric burns within 80mm from the end of the profile.
6 Test methods
Chemical composition analysis method, room temperature mechanical properties test method, dimension measurement method, appearance inspection method The chemical composition arbitration analysis method, room temperature mechanical properties test method, dimension measurement method and appearance inspection method of the product shall comply with the provisions of GB5237.1.
6.2 Determination method of anodic oxide film
The quality inspection of anodic oxide film should be carried out 72 hours after the sealing is completed. 6.2.1 Determination method of anodic oxide film thickness The determination of anodic oxide film thickness can be carried out according to the methods specified in GB/T8014 and GB/T4957, and the arbitration determination shall be carried out according to GB/T8014 and GB/T6462.
6.2.2 Inspection method for sealing quality of anodic oxide film The test for sealing quality of oxide film shall be carried out in accordance with GB/T14952.1. 6.2.3 Determination method for color and color difference of colored anodic oxide film The determination of color and color difference of colored anodic oxide film shall be carried out in accordance with the relevant provisions of GB/T14952.3. 6.2.4 Determination method for corrosion resistance of anodic oxide film 6.2.4.1 CASS test
The copper accelerated acetic acid salt spray test of anodic oxide film shall be carried out in accordance with the method specified in GB/T10125, and the test results shall be determined in accordance with GB/T6461, as shown in Table 4.
Proportion of defect area after test/%
>0.02~0.05
Protection level
Proportion of defect area after test/%
>0.05~0.07
>0.07~0.10
>0.10~0.25
Protection level
GB5237.2—2004
6.2.4.2 Alkali drop test
At 35℃±1℃, drop about 10mg, 100g/.NaOH solution onto the surface of the profile sample, visually observe the drop until corrosion bubbles appear, and calculate the time it takes for the oxide film to be penetrated. The time it takes for the oxide film to be penetrated can also be measured by an instrument. 6.2.5 Test method for wear resistance of anodic oxide film The wear resistance of anodic oxide film adopts the falling sand test, and the method is shown in Appendix A. 6.2.6 Weathering test of anodized film
Weathering test is carried out according to the method specified in GB/T16585 and graded by visual method according to GB/T1766. Or by negotiation between the two parties. 7 Inspection rules
7.1 Inspection and acceptance
7.1.1 The product shall be inspected and accepted by the supplier's technical supervision department to ensure that the product quality meets the requirements of this standard and fill in the quality certificate. 7.1.2 The buyer may inspect the received products according to the provisions of this standard. When the inspection results do not conform to the provisions of this standard or the contract, the objection to the appearance quality and dimensional deviation shall be raised within one month from the date of receipt of the product, and the objection to other performance shall be raised within three months from the date of receipt of the product. The two parties shall negotiate and resolve the issue. If arbitration is required, the arbitration sampling shall be conducted by the buyer and jointly by the two parties. 7.2 Batching
The products shall be submitted for acceptance in batches, and each batch shall consist of profiles of the same brand, state, specification and surface treatment method, with no limit on batch weight. 7.3 Inspection Items
Each batch of products shall be inspected for chemical composition, dimensional deviation, mechanical properties, appearance quality, oxide film thickness, sealing quality, and oxide film color change and color difference. Corrosion resistance, wear resistance, and weather resistance shall be inspected regularly (at least once a year). Generally, no inspection is required, but the supplier shall guarantee the corresponding quality requirements. If the user needs to test, it shall be indicated in the contract. 7.4 Sampling
Product sampling shall comply with the provisions of Table 5.
Inspection items
Chemical composition, dimensional deviation, mechanical properties, appearance quality, film thickness
Sealing quality
Color, color difference
Corrosion resistance, wear resistance
Weather resistance
Sampling regulations
According to the provisions of GB5237.1
According to Table 6
Take 2 profiles from each batch, and take 1 sample from each according to the provisions of GB/T14952.3||t t||Take 2 profiles from each batch, and take 1 sample from eachTake 2 profiles from each batch, and take 1 sample from each
Required article number
5.3, 5.4.5.6
Test method article number
6.2.4.6.2.5
7.5 Determination of test results
7.5.1 When the number of unqualified anodic low-calorification film thickness exceeds the upper limit of unqualified products specified in Table 6, double the number of profiles should be taken for re-test. If the number of unqualified products does not exceed twice the upper limit of unqualified products allowed in Table 6, it is qualified. Otherwise, the whole batch is judged as unqualified, but the supplier can test each one, and the qualified ones will be delivered.
Batch inspection range
11~200
201~300
301500
501~800
800 and above
Number of random sampling
Unit is root
Upper limit of number of unqualified products
GB5237.2—2004
7.5.2 If the color and color difference of the oxide film are unqualified, the batch will be judged as unqualified, but the supplier can inspect each root and deliver the qualified ones. 7.5.3 If the sealing quality, corrosion resistance, wear resistance and weather resistance are unqualified, the batch will be judged as unqualified. 7.5.4 The inspection results of other items shall be judged in accordance with GB5237.1. 8 Marking, packaging, transportation and storage
8.1 The maintenance of anodized film shall refer to Appendix C. 8.2 The quality certificate shall indicate the oxide film grade, color, corresponding test results and the corresponding contents specified in GB5237.1. 8.3 The handling and temporary protection measures of profiles during transportation and installation shall refer to the corresponding provisions of Appendix D; the requirements for profile packaging, marking, packaging, transportation, storage and other contents shall be implemented in accordance with the provisions of GB5237.1. 8.4 The qualified profiles shall have a label (or certificate) with the following contents: a)
Supplier name and address;
Inspection stamp of the supplier's quality inspection department;
Alloy grade and state;
Name and specification of profile (the name of profiles for external doors and windows shall indicate "external doors" or "external windows"), oxide film thickness level and color;
Production date or batch number;
This standard number;
Production license number.
GB5237.2—2004
A.1 Scope
Appendix A
(Normative Appendix)
Falling Sand Test Method
This appendix specifies the method for determining the wear resistance of anodic oxide film by using the falling sand test. This appendix is applicable to the test of the wear resistance of anodic oxide film on aluminum alloy substrate. A.2 Summary of the Method
Use the specified abrasive to fall freely at a certain height to wash the oxide film on the surface of the sample and wear it through. The wear resistance of the oxide film is evaluated by the mass of the falling abrasive.
A.3 Test instruments and abrasives
A.3.1 The schematic diagram of the test instrument results (Figure A, 1) is as follows: 0ZE
Flow control needle valve
Material
Glass-breaking slide bucket inner diameter 70, inner angle 60°
Inner diameter 5±0.1
Inner diameter of catheter 20
Unit is mm
A.3.2 The test abrasive is No. 80 black silicon carbide specified in GB/T2480. It can be reused 50 times and should be dried at 105℃ before each use.
A.4 Sample preparation
A.4.1 The sample should be cut on the decorative surface of the profile. When it is impossible to sample directly on the profile, a test piece with the same production process and representative of the profile under test can be used instead.
A, 4.2 The size of the specimen is 50mm×40mm. A.5 Test environment
A.5.1 The test should be carried out in an environment with a relative humidity of no more than 80%. A.5.2 Avoid wind during the test.
A.6 Test steps
A.6.1 Measure the thickness of the oxide film of the sample with an eddy current meter according to the method specified in GB/T4957 and make a record. 6
GB5237.2—2004
A.6.2 Fix the sample on the sample support with the test surface facing up, the area for measuring the oxide film thickness facing the guide tube, and the test surface and the guide tube at a 45-degree angle.
A6.3 Add the weighed abrasive (accurate to 1g) into the funnel, turn on the switch to let the abrasive fall freely, and control the flow rate at about 320g/min. At the same time, observe the sample under test. When a small black spot appears on the surface of the sample under test and gradually expands to about 2mm, immediately turn off the switch to stop the sand falling, and then weigh the mass of the abrasive. From the above two weighings, calculate the mass of the abrasive required to wear through the oxide film. A.7 Test results
Use the wear coefficient () to judge, and the calculation formula is as follows: f=m/ha
Where:
f is the wear coefficient, in grams per micron (g/μm), m
is the mass of the abrasive consumed, in grams (g): ho--the thickness of the oxide film, in microns (μm). (A.1)
GB5237.2-2004
Appendix B
(Informative Appendix)
Guidelines for selecting film thickness grades
Anodized film is one of the main quality characteristics of aluminum alloy building profiles. The film thickness will affect the corrosion resistance, wear resistance, weather resistance and service life of the profiles. Building profiles used in different environments should use different thicknesses of anodized films. Table B.1 lists the use environments of oxide films of different thickness levels for reference by consumers. Table B.1
Film thickness grades
Use environment
Application examples
Kitchen utensils, daily necessities, household appliances, decorations, used in outdoor places with clean air, away from industrial pollution and away from the ocean. Indoors can be used under normal circumstances
Used in places with industrial air pollution, acidic gas, astringent environment or frequent rain, and marine climate. However, the above environmental conditions are not very important for use in places with very harsh environments. Such as long-term atmospheric pollution, moisture or rain, friction, especially the surface where condensation may occur, vehicle exterior decoration, indoor and outdoor doors and windows, kitchen utensils, ships, outdoor building materials, firewood walls, etc., ships, firewood walls, doors and windows, mechanical piano parts
Appendix C
(Informative Appendix)
Maintenance of anodic nitride film
GB5237.2-2004
The main reason for the damage of aluminum alloy anodic oxide film is due to the deposition of dust and dirt, and the absorption of moisture is corroded, especially when there are sulfides in the air, which is more susceptible to corrosion. When the building profile is used for a long time, the surface of the oxide film must be cleaned on time to extend the service life. The period of regular cleaning of the oxide film is generally half a year. The interval can be determined according to the degree of pollution in the use environment. When cleaning, pay attention to cleaning the surface dirt and not damaging the anodized film. The cleaning method can be determined according to the degree and scale of possible damage to the oxide film. For small workpieces, it is usually wiped gently by hand. For large workpieces, it is required to try to dissolve the sticky deposits. Dirt is generally cleaned with hot water containing appropriate lubricants or neutral soap solution. A fiber brush can also be used to remove attached dust. It is not allowed to use sandpaper, wire brushes or other friction objects, nor is it allowed to use acid or cracks for cleaning, so as not to damage the anodized film. After cleaning, it should be washed with clean water, especially where there are cracks and dirt, and it should be wiped with a soft cloth dipped in alcohol. Finally, the anodized film should be polished with a superior wax. GB5237.2-2004
Appendix D
(Informative Appendix)
Handling and temporary protection measures for profiles during transportation and installation In order to avoid damage to the oxide film, the following issues should be noted during transportation and installation. The anodized films are not allowed to rub or slide against each other. During transportation, storage and stacking, they should be carefully protected with appropriate containers. It is also possible to use some kind of varnish or easily removable wax film or plastic film for protection to prevent sewage, condensate, cement and other dirt from contacting the profile surface and causing corrosion.
It is recommended to arrange the installation of aluminum alloy building profiles in the later stage of construction, and to affix the following label to the packaging of building profiles delivered to the construction site as much as possible: "In order to avoid damage to the anodized film of the profile, special care should be taken during each handling process. When storing and stacking, it is not allowed to contact with pollutants such as cement and mortar, otherwise it will cause damage to the oxide film." 102—2004
Appendix D
(Informative Appendix)
Handling and temporary protection measures for profiles during transportation and installation In order to avoid damage to the oxide film, the following issues should be noted during transportation and installation. The anodic oxide films are not allowed to rub or slide against each other. During transportation, storage and stacking, they should be carefully protected with appropriate containers. Some kind of varnish or easily removable wax film or plastic film can also be used for protection to prevent sewage, condensate, cement and other dirt from contacting the profile surface and causing corrosion.
It is recommended that the installation of aluminum alloy building profiles be arranged in the later stage of construction, and as far as possible, the following label should be affixed to the packaging of the building profiles delivered to the construction site: "In order to avoid damage to the anodic oxide film of the profile, special care should be taken during each handling process. During storage and stacking, it is not allowed to contact with cement, mortar and other pollutants, otherwise it will cause damage to the oxide film." 102—2004
Appendix D
(Informative Appendix)
Handling and temporary protection measures for profiles during transportation and installation In order to avoid damage to the oxide film, the following issues should be noted during transportation and installation. The anodic oxide films are not allowed to rub or slide against each other. During transportation, storage and stacking, they should be carefully protected with appropriate containers. Some kind of varnish or easily removable wax film or plastic film can also be used for protection to prevent sewage, condensate, cement and other dirt from contacting the profile surface and causing corrosion.
It is recommended that the installation of aluminum alloy building profiles be arranged in the later stage of construction, and as far as possible, the following label should be affixed to the packaging of the building profiles delivered to the construction site: "In order to avoid damage to the anodic oxide film of the profile, special care should be taken during each handling process. During storage and stacking, it is not allowed to contact with cement, mortar and other pollutants, otherwise it will cause damage to the oxide film." 10
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