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Corrosion Resistance

From METALAST International, Inc.
 

 
One of the benefits of the METALAST Technology is improved corrosion resistance. Corrosion resistance is typically measured using a salt spray procedure (ASTM B 117) where the anodized samples are exposed to a heated salt spray to accelerate corrosion. In order to pass MIL A 8625F, Type II anodized samples must last 336 hours in the salt spray chamber before significant corrosion occurs. Testing was performed on six common alloys: 2024-T3, 3003-H14, 5005-H34, 6061-T6, 6063-T52, and 7075-T6. Ten aluminum coupons (4"x 4") of each alloy were anodized to 0.7 mil under Type II conditions using the METALAST Technology. The anodized samples were then sealed in a nickel acetate solution. The corrosion resistance of the samples was measured according to ASTM B 117 and MIL A 8625F procedures which states that the test specimens show no more than 5 isolated pits in a total of 30 square inches of test material from one or more test pieces. In this case, a failure occurs when two coupons (30 square inches) have a total of 6 pits. Both the anodizing and the corrosion testing were performed at the METALAST Tech Center.
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Topics of Interest
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