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topic 17469

Anodize test


Could you tell me the best test to measure if my black anodize coating is well done?


Carlos Pongo
- Chatsworth, California


Good quality anodize can't be determined in a single test. It needs to be corrosion resistant, thus, the anodizer should be doing monthly panels to demonstrate that they are indeed producing a corrosion resistant anodize. It should be sealed to avoid color fading upon exposure to excesses of light, heat or certain chemicals. A typical seal integrity test is ASTM B136-84 [affil. link to spec at Techstreet] . A cheap, unsealed anodize will easily show up with this test. Lastly, the anodize should be a set thickness in order to maintain final, finished dimensions. In general a typical black anodize should be on the order of 1/2 to 1 mil thick. All specs such as Mil-A-8625 [link is to free spec at Defense Logistics Agency,] define quality anodize. Good luck....

milt stevenson jr.
Milt Stevenson, Jr.
Anoplate Corporation
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Syracuse, New York
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