This standard specifies the copper sulfate test method for testing the continuity of thin anodic oxide films on aluminum and aluminum alloys. This standard is applicable to the rapid test of the continuity of thin oxide films on aluminum and aluminum alloys. GB/T 8752-1988 Anodic oxidation of aluminum and aluminum alloys - Test of continuity of thin anodic oxide films - Copper sulfate test GB/T8752-1988 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Anodizing of aluminium and aluminiumalloys— Check of coating continuity of thinanodic oxide coatings-- Copper sulphate test
Anodizing of aluminium and aluminiumalloys— Check of coating continuity of thinanodic oxide coatings-- Copper sulphate testThis standard specifies the copper sulphate test method for checking the continuity of thin anodic oxide coatings on aluminium and aluminium alloys. UDC 669.71 : 621
.794.61:620.1
GB 8752—88
ISO2085--86
This standard applies to the rapid inspection of the continuity of thin oxide films (thickness less than 5μm) on aluminium and aluminium alloys. For example, when there is doubt about visible defects on the surface of the oxide film, this method can be used to determine whether the defect is a local defect (exposed base metal). This standard is equivalent to IS02085-1986 "Anodizing of Aluminum and Aluminum Alloys - Copper Test for Continuity of Thin Anodic Oxide Films".
1 Principle of the Method
When there is exposed base metal or a poor oxide film in the test area, the steel ions in the copper sulfate solution will undergo a replacement reaction with the aluminum at the defect, accompanied by gas release. As a result of the reaction, many black spots can be observed at the defects of the oxide film.
The location to be inspected can be selected arbitrarily, but it should be avoided from the current input end during anodizing. The test area is about 100mm'.
When using a drop of copper sulfate solution for inspection, it can be observed with the naked eye or with the help of a magnifying glass. Once the solution is dripped, it can be found that gas is immediately precipitated at the location of the exposed base metal. 2 Solution
The solution is prepared with analytical reagents and distilled water (or deionized water). The solution composition is as follows: sulfuric acid (CuSO·5H,O): 20g:www.bzxz.net
hydrochloric acid: 20 ml (p = 1. 18 g/ml);
distilled water; 1000ml.
3 Test steps
3.1 Remove all grease on the surface of the test piece with an organic solvent. Select a plane on the test piece and circle the test area to be tested with a crayon or quick-drying paint, the size of which is about 100mm. Do not stain the test area with paint. 3. 2 Drop four drops of copper sulfate solution on the selected test area and keep it on the test surface for 5 minutes. 3.3 The test temperature should be 20±5℃.
4 Result display
After the reaction has been carried out for 5 minutes, check the surface condition and count the number of black spots on the 100mm area. In order to make a more quantitative evaluation, the China Nonferrous Metals Industry Corporation approved it on February 4, 1988 and implemented it on February 1, 1989.
Additional Notes:
This standard was drafted by the Northeast Light Alloy Processing Plant. The main drafters of this standard are Gao Kangzhi and Wang Ziyi. 278
GB 8752-
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