QB/T 2184-1995 Technical requirements for anodizing of aluminum alloy parts for bicycles
Some standard content:
Industry Standard of the People's Republic of China
Technical Conditions for Anodizing of Aluminum Alloy Parts of Bicycles Subject Content and Applicable Model
QB/T2184—95
This standard specifies the terms, types, categories, signs, technical requirements and test methods for anodizing of aluminum alloy parts of bicycles. This standard applies to aluminum alloy anodized parts of various types of bicycles specified in QB1714 Bicycle Naming and Model Compilation Method.
2° Reference Standard
GB5944 Evaluation of Corrosion Test Results of Metal Coatings of Light Industrial Products 3 Terms
3.1 Aging
The degree of structural variation of the oxide film due to the slow and continuous sealing process depends on the atmospheric exposure time. 3.2 BurnoutwwW.bzxz.Net
3.2.1 During the anodizing process, the oxide film is subjected to severe electrical breakdown, causing local damage to the base aluminum. 3.2.2 During the anodizing process, the oxide film presents a soft powdery surface due to local overheating. 3.3 Powdering
The surface after anodizing forms a layer of white powder in the atmosphere, usually due to the poor quality of the anodized film.
3.4 Peeling
The phenomenon of the anodized film breaking and the decreased adhesion. 3.5 Bottom exposure
The anodized part has a partial or complete absence of the oxide film, showing the color of the matrix. 3.6 Afterspot effect
The phenomenon of delayed appearance of spots on the surface of the finished product. 3.7 Bumps
Obvious depressions and scratches on the workpiece surface and obvious scratches on the oxide film. 3.8 Water marks
The color of the oxide film formed by residual water droplets after oxidation is inconsistent. 3.9 Flow marks
The color of the oxide film formed by the enclosed residual solution is inconsistent. 3.10 Stripes
Approved by China Light Industry Association on 1995-12-05 78
Implementation on 19960701
QB/T2184--95
A strip-shaped dark, non-bright area appears on the oxide film. Types, categories and marks of anodizing of aluminum alloy parts 4.1 Types
The types of anodizing of aluminum alloy parts are distinguished by the processing characteristics, processing name and post-processing method. 4.1.1
The processing to be tagged is shown in Table 1.
Full bright oxidation
Bright oxidation
Mixed semi-bright oxidation
Dark oxidation
The processing name is shown in Table 2.
Oxalic acid anodizing
Sulfuric acid anodizing
Chromic acid anodizing
Mixed acid anodizing
Post-treatment methods are shown in Table 3.
Boiling water sealing
Steam sealing
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The electrolyte contains two or more acids. When spelling the code, the code of the main acid should be placed in front, and the codes of the other acids should be placed at the back
4.2 Category
QB/T2184--95
Bicycle aluminum alloy anodizing is divided into three categories. The category of each component is determined by the product standard. 4.3 Marking
The marking of anodized bicycle aluminum alloy parts consists of four parts: treatment method code, treatment characteristics and treatment name code, post-treatment method code and category. Each part is connected by a dot, ". The treatment method code is represented by D for electrochemical treatment: the treatment characteristics and treatment name code, and the post-treatment method code are shown in Table 1, Table 2, and Table 3: the categories are represented by numbers 1, 2, and 3. The order of arrangement is as follows:
Post-treatment method code
Treatment name code
Treatment code to be collected
Treatment method code
Example:
5 Technical requirements
s.1 Appearance
Class I parts
Boiling water sealed
Sulfuric acid anodizing
Light-filling oxidation
Electrochemical treatment
The appearance quality of anodized aluminum alloy parts shall comply with the requirements of Table 4. Table 4
Class I parts
Class II parts
Class III parts
Appearance requirements
The oxide film shall be continuous, uniform, dense, and uniform in color. There shall be no defects such as aging, burning, powdering, peeling, bottom exposure, after-spot effect, obvious bruises, water avoidance, flow attenuation, streaks, etc. The composite film shall be continuous, uniform, dense, and uniform in color. There shall be no defects such as aging, burning, powdering, peeling, bottom exposure, after-spot effect, and obvious bruises.
There shall be no defects such as aging, burning, powdering, peeling, bottom exposure, after-spot effect, and obvious bruises. 5. 2 Thickness of oxide film
QB/T2184—95
The thickness of anodized film on aluminum alloy parts shall comply with the provisions of Table 5. Table S
Thickness of oxide film
53 Plating resistance of composite film
Class I parts
Class II parts
5.3.1 Corrosion resistance of oxide film (CASS method) test time and corrosion resistance grade shall comply with the provisions of Table 6, Table 6
Test time h
Corrosion resistance grade
5.3.2 Alkali resistance of oxide film
Class I parts
Class II parts
Class III parts
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The alkali resistance of anodized film on aluminum alloy parts is tested by the evolution method. The surface to be tested The oxide film should not be broken within the specified time. The alkali dripping time of various oxide films should comply with the provisions of Table 7. Table 7
Alkali dripping time
·Test method
Class I parts
Class II parts
Class III parts
6.1 Appearance test
6.1.1 Under natural light (or illuminated by two 40W straight tube fluorescent lamps, the test piece and the lamp are 60cm apart), the test piece and the tester are about 40cm apart, and visual inspection is carried out. 6.1.2 The test position is the front view, main surface, and use surface of the test piece. The specific position is specified by the product standards of each component. 6.2 Complex film thickness test
6.2.1 The test surface of the test piece is cleaned with alcohol or gasoline, and tested with an eddy current thickness gauge, and the operation is carried out according to the method specified in the instrument manual.
6.2.2 The test part should be the front view, main surface and use surface of the test piece. The specific measurement parts and points of each component shall be specified by the component product standard. The test data shall be based on the lower set. 6.3 Oxide film corrosion resistance test
6.3.1 Oxide film corrosion resistance test
6.3.1.1 Test method
Copper salt plus acetate test (CASS) method. The steel salt accelerated acetate test (CASS) method is used.—81-
6.3.1.2 Test equipment
QB/T2184—-95
Salt water spraying. Its specifications and requirements are shown in the attached A. 6.3.1.3 Preparation and placement of test pieces
. The test pieces shall be degreased with alcohol or gasoline, and cleaned with magnesium oxide powder if necessary to ensure that there is no oil stain. The edges, holes and mechanically abraded parts of the test pieces shall be protected at a distance of 2 mm. C. The test pieces shall not be in contact with each other during installation, and their main surfaces shall face the airflow direction and be connected at an angle of 15 to 30 degrees. 6.3.1.4 Test conditions
The test liquid shall be In each liter of fluorinated liquid (concentration 50±5L), 0.26±0.02g of chemically pure oxidizer (CuCl·2HO) is added.
Use chemically pure glacial acetic acid to adjust the pH to 3.0~3.1. The nozzle air pressure is 70~100kP.
The average salt precipitation is 1~2mL/80cmh within 8h, and the temperature of the salt spray chamber is 50±2℃.
The saturated air temperature is 47±2℃.
|6.3.1.5 The test time is 8h, using continuous acid mist 6.3.1.6 Treatment of the test piece after the test
After the test, gently wash the test piece in running water, or use running water to remove the sediment attached to the surface of the test piece.
Observation environment is the same as 6.1.1,
The evaluation method adopts the simple 10-level grading method in GB5944. The number of corrosion points on the 1dm test surface 6.3. 1.8
The relationship between corrosion resistance and peeling corrosion grade is shown in Table 8.
Corrosion slope points
>16~32
>32~64
>64128
>128~256
A few notes on evaluating corrosion resistance grade, 82
Corrosion resistance grade
QB/T2184—95
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. If the assessment area is less than 1dm, it can be reduced in proportion or calculated by using multiple parts to form 1dm. If the assessment area is greater than 1dm,It can be graded according to the number of corrosion points allowed per square decimeter. b. When calculating corrosion points, corrosion points within 5mm apart should not be counted. c. If any corrosion point larger than 2.5mm×2.5mm is found in any area within the test area or more than 10 corrosion points appear within the area of 5mm×5mm, the test piece cannot be graded. 3.1. Calculation of effective test area of multiple test pieces The effective test area of the test piece is calculated according to a unified method, in accordance with the product standards of each component. 6.31 Oxidation film alkali resistance test
6.321 Chemical reagent
10% sodium hydroxide solution. Preparation method: Take 10g of chemically pure sodium hydroxide and dilute it into 100mL in water. 6.32.2 Test method First, wipe the surface of the test piece with cotton wool with sugar, then place a piece of melted paraffin (the diameter of the circle is about 0.5 cm) in the middle of the test piece surface, place it in a temperature range of 35 ± 1 and keep it for 30 minutes, then pour a layer of sodium hydrofluoride on the surface of the paraffin circle, count the specified time with a stopwatch, wipe it with cotton wool, and then drip sodium sulfate filtrate (preparation method: 1000mL distilled water plus 20mL hydrochloric acid with a density of 1.19 and 20g crystalline copper sulfate) at the source. If it does not change color within 5 minutes, it means that the oxide film is not broken.
QB/T 2184-95
Technical requirements for salt water spray box
(Supplement)
Since the structure of salt water spray has a great influence on the spraying and aggregation, this appendix specifies some main technical conditions of salt water spray box.
A1 The materials of the spray box, the hooks in the box, the clamps, etc., should be resistant to the corrosion of the test solution used in this method. A2 Considering the characteristics of bicycle products, the effective volume of the box should be roughly within the range of the following dimensions. 1.5×0.8×0.70.8m
1.6×0.9×0.8~1.2m
2.0×1.0×081.6m
2.0×1.1×0.92.0m
2.4×1.1X0.92.4m
2.0×1.4×1.02.8mm
2.2×1.6X1.0~3.5m
The box is completely sealed, the top of the box is tilted, and the top angle is not greater than 100°, so that the test piece does not fall directly on the test piece. A3 spray box requires reliable temperature adjustment speed to ensure that the temperature difference at each point in the spray chamber does not exceed ±2°C. The thermometer is placed 100mm away from the whole box and can be read outside the box. The temperature control instrument is required to be simple and reliable. A4 The exhaust port of the spray box is arranged at the lower end of the rear wall of the box, so that the salt air flow can fill and flow through the entire spray pot, and then be discharged from the exhaust camp. There is a little slope at the bottom of the sprayer to facilitate drainage. The drain port should be at the lower end of the exhaust port and can be closed with a valve. A3 The compressed air must first remove oil impurities and be saturated with distilled water heated to 47 ±2°C. The nozzle diameters are: 0.51~0.53mm for air pipes and 0.74~0.76mm for salt water pipes, ensuring a 90° angle. It is required that the salt spray is reflected by the baffle or the whole box and shall not be sprayed directly in the direction of the test piece. A6 The number of nozzles and the amount of compressed air should ensure that the collector with an area of 80cm* collects an average of 1~2mL/h of salt spray within 8h. The collector should be arranged at the bottom of the box, with at least one near and far from the nozzle, and can be read and discharged outside the box. Additional notes:
This standard is proposed by the Quality Standards Department of the China Light Industry Association. This standard is developed by the National Bicycle Standardization Center. This standard is drafted by the drafter of the industry standard "Technical Conditions for Anodizing of Bicycle Aluminum Alloy Parts". The main drafters of this standard: Yang Huoji, Chen Zhiyu, 84
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