GB/T 14952.1-1994 Evaluation of sealing quality of anodic oxide films of aluminum and aluminum alloys - Phosphorus-chromic acid method

GB/T 14952.1-1994 Anodic oxidation of aluminum and aluminum alloys. Evaluation of sealing quality of anodic oxide films. Phosphorus-chromic acid method. GB/T14952.1-1994 standard download decompression password: www.bzxz.net

UDC669.71:669.715：620.197.2H12
National Standard of the People's Republic of China
GB/T14952.1~14952.3—94
Anodizing of aluminium and aluminium alloys-Testing method for anodic oxide 1994-03-11 Issued
State Administration of Technical Supervision
1994-06-01 Implementation
GB/T14952.1—94 Assessment of sealing quality of anodic oxide coatings on aluminium and its alloys--Phosphorus-chromic acid method GB/T14952.2-94 Assessment of sealing quality of anodic oxide coatings on aluminium and its alloys--Acid leaching method GB/T14952.3—94
Anodic oxidation of aluminium and its alloys--Assessment of quality of sealed anodic oxide coatings by measurement of the loss of mass after Immersion in phosphoric-chromic acid solution This standard is equivalent to the international standard ISO3210-1983 "Aluminum and aluminum alloy anodic oxidation-Assessment of the sealing quality of anodic oxide films". 1 Subject content and scope of application
GB/T14952.1-94
- Mass loss after phosphorus-chromic acid etching
This standard specifies the method for evaluating the sealing quality of aluminum and aluminum alloy anodic oxide films according to the mass loss after etching in phosphoric-chromic acid solution.
This standard specifies the arbitration method for evaluating the sealing quality of aluminum and aluminum alloy anodic oxide films. This standard is applicable to anodic oxide films that are exposed to the atmosphere, play a protective role in corrosive media and focus on anti-pollution. This standard does not apply to anodic oxide films treated by the following processes: a. Hard anodic oxide films that are usually not sealed; anodic oxide films that have only been sealed in dichromate solution; b.
c. Anodic oxide films that have been treated with hydrophobicity.
This method is a destructive test. www.bzxz.net
2 Principle of the method
Anodized films without sealing treatment will quickly dissolve in a specific acidic medium, while well-sealed oxide films can withstand long-term immersion without obvious corrosion.
3 Reagents
Reagents should be analytically pure reagents; water should be distilled water or deionized water. 3-1 Chromium trioxide (CrO:)
3.2 Phosphoric acid (pzo=1.7g/mL)
3.3 Phosphorus-chromic acid solution: Dissolve 20g chromium trioxide (3.1) and 35mL phosphoric acid (3.2) in 500mL water, transfer to a 1000mL volumetric flask, dilute to the scale with water, and mix.
4 Instruments
The sensitivity of the analytical balance is 0.1mg.
Approved by the State Administration of Technical Supervision on March 11, 1994, and implemented on June 1, 1994
5 Preparation of samples
GB/T14952.1--94
For heat-sealed materials, samples can be taken at any time after sealing. For materials sealed at room temperature, samples can be taken after 24 hours. Cut a sample from the material to be tested, with an effective surface area of ​​about 1dm2 (minimum 0.5dm2). Usually its mass does not exceed 200g. For hollow extrusions, the sample should be cut from the end of the profile with an anodic oxide film on both the inner and outer surfaces of the test piece. In special cases (such as a certain type of fixture, small hollow profiles, etc.), the anodic oxide film on the inner surface should be removed and the test should be carried out on the outer surface of the extrusion. 6 Operating steps
6.1 Measure the total effective surface area S of the sample (excluding the cut edge section and other surfaces not covered with oxide film). Wipe off the frost on the surface of the sample with a dry cloth.
6.2 Degrease the sample with an appropriate organic solvent at room temperature according to the method described in A1 and A2 of Appendix A. After drying, weigh (m,) immediately, accurate to 0.1 mg. 6.3 Immerse the sample upright and completely in the phosphorus-chromic acid solution (3.3) preheated to 38 ± 1 ° C for 15 minutes (a water bath or continuous stirring should be used to ensure that the solution temperature is uniform). The solution (3.3) can be reused, but it should be discarded after treating 10dm of oxide film per liter of solution. Do not use the solution that has come into contact with materials other than aluminum and aluminum alloy anodized films. 6.4 Remove the sample from the solution and wash it with tap water first, then with deionized water or distilled water. Treat it according to A3 of Appendix A, and after drying, weigh (mz) immediately, accurate to 0.1 mg. 6.5 During the operation of 6.2 to 6.4, do not touch the sample with your hands, and the drying process of 6.2 and 6.4 should be carried out according to the same operating steps, and the drying temperature shall not exceed 60℃. 7 Result Expression
The mass loss per unit area is calculated by the following formula: Am,
Where: Am,—mass loss per unit area of ​​the sample, mg/dm\, m1-—mass of the sample before acid leaching, mg; m2——mass of the sample after acid leaching, mgS—total effective surface area of ​​the sample, dm.
8 Test Report
The test report shall include the following contents:
Type and identification mark of the tested product;
b. Number of this standard:
Test results,
Any differences from the contents specified in this standard (whether agreed or not);
Test date.
GB/T 14952.1—94
Appendix A
Methods for drying samples before and after acid treatment
(Supplement)
A1 At room temperature, stir the sample in an appropriate organic solvent for 30 seconds or scrub and degrease, then air dry (pre-dry) for 5 minutes in the room, then place the sample upright in a drying oven preheated to 60°C and dry for 15 minutes (when using chlorinated solvents for degreasing, such as perchloroethylene, pre-drying should be carried out in a good fume hood to prevent inhalation of solvent vapor). A2 In a sealed desiccator, place the sample on top of silica gel and cool for 30 minutes. A3 Repeat the operations of A1 and A2 except that no organic solvent is used. Additional remarks:
This standard was proposed by China Nonferrous Metals Industry Corporation. This standard was drafted by the Standard and Metrology Institute of China Nonferrous Metals Industry Corporation and the Beijing Nonferrous Metals Research Institute. The main drafters of this standard are Yao Chuan, Gong Qi and Zhu Zufang. 3
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