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topic 50517

Anodizing and Alodining

November 10, 2008

dear sir one of my exam question was what is chemical protection for aluminium 1 anodizing 2 alodizing I think both is on a chemical reaction can you explain I is right many thanks Frank

Frank N.
student - Melbourne, Australia

November 14, 2008

We'd have to see the exact wording on the exam, Frank. Anodizing is an electrochemical process rather than a simple chemical conversion process, and that may be what they were trying to get at. There is a Henkel chromate conversion coating for aluminum with the trade name "Alodine". I would call the process of applying Alodine "Alodining", but some people apparently call it "Alodizing" (although Henkel probably dislikes that corruption).


Ted Mooney, Teds signature
Ted Mooney, P.E.
Pine Beach, New Jersey
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