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Anodize Seal quality test

Hi,

Could you please specify how to do seal quality test with ink for chromic anodize coating?

Owen Y. Liao
- Barrie, On., Canada

British Standard 3987:1974, anodic oxide coatings on wrought aluminum for external Architectural applications is a test, sorry, I don't see the use of ink anywhere, and it might be for sulfuric anodized parts, but I gave it a try.

Tom Pullizzi
Falls Township, Pennsylvania

The "stain resistance test" as we call it can be found in detail in the ASTM document titled ASTM B136 "Measurement of stain resistance of anodic coatings-test method" Your local Document center should have this. Basically a 50% nitric acid is applied to a small area (drop or two) of the part and left on for 6 minutes after which it is wiped with a clean damp cloth. A Blue dye is then applied for a particular period and after wiping again no absorption of the dye should have occurred. This test should not be used for 2000 series alloys containing high 4% copper.

Good luck.

Bill Grayson
- Santa Cruz, California, USA

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