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See Chinese contents: GB/T 8753.4-2005 GB/T 8753.4-2005: Anodizing of aluminium and aluminium alloys -- Assessment of quality of sealed anodic oxide coatings -- Part 4: Dye spot test with prior acid treatment
This part specifies the method for assessing the quality of sealed anodic oxidation coatings, by the anti-dying adsorption ability, after acid treatment. This part is applicable to the production control inspection of anodic oxidation coating, with anti-pollution ability, which is subject to atmospheric sun-exposure or corrosive environment.
