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7050T7451 Corrosion Tests

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I am having problems with my anodize passing salt spray tests. I would like to get additional info if possible.

1. We have fabricated our test samples our to plate. Is there a difference between running the samples made of extrusion vs plate in this alloy?
2. I have noticed a pattern in the samples after etch and anodize. It is confined to 1 face of the samples. When I run my finger nail over the areas there is a definite hang. Any thoughts on the condition?

Bob Potter
metal finishing - Wichita, KS, USA

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