Non-chromate conversion coatings for aluminum and aluminum alloys
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United States of America Patent
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Jun 19, 2001
Grant Date -
N/A
app pub date -
Jun 25, 1998
filing date -
Jun 27, 1997
priority date (Note) -
Expired
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Abstract
A method and solution for forming a non-chromate conversion coating on an aluminum substrate. The invention was developed to replace the potentially toxic chromic acid process. The method provides a conversion solution capable of substituting a select set of metallic ions for the aluminum ions of the gel formed on the substrate, wherein the metallic ions have ionic radii differing less than 35% of the aluminum ion radii and where the coordination numbers of the respective ions remain the same. The preferred substituting metal ion of the invention is manganese. Manganese was found to be a close match to both the ionic radii and coordination numbers of the aluminum ions to be replaced.
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