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A Comparison Study of the Chemical Dissolution of Aluminum Alloys in Sulfuric Acid Solution with and without METALAST Additive

From METALAST International, Inc.

The effect of the METALAST additive on the chemical dissolution of bare aluminum in anodizing solutions was investigated in this study. The results showed that the dissolution rates of aluminum alloys employed in this study were reduced about 13% to 33% by addition of METALAST additive to static anodizing solutions. From these results, it is apparent that METALAST additive has positive effect to some extent on preventing the direct dissolution of aluminum from substrate to an anodizing solution. However, it was also shown that the effect reduced as the intensity of solution agitation increased. The results also showed that the dissolution of aluminum alloys in anodizing electrolytes at 32 °F was very slow. As a result, the effect of the METALAST additive on the dissolution of bare aluminum parts in the MLT - III anodizing solution is trivial from practical standpoint of view.
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