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Titanium passivation versus anodizing
Can anyone tell me if passivation of Titanium is required per ASTM B600 for orthopedic implants. or is a type II or Type III anodization process alone sufficient.
Jason Geroldproduct designer - Eden Prairie, Minnesota USA
October 14, 2008
ASTM B600 is as much a pretreatment process as it is a "passivation." Titanium pretty well passivates itself but in manufacturing other materials - metal cutting tools, cutting and lubricating fluids, deburring media, etc. - can become embedded in the surface of the titanium. The cleaners and acidic etch specified in B600 will remove those contaminants allowing the titanium to reform a fully protective passive layer. Combining B600 followed by anodic treatment may be used to impart color, however, in my opinion results in little additional degree of protection. In my experience, titanium anodizing is performed for coloring to ease identification during surgical procedures. It's hard to believe that anyone anodizing isn't performing an ASTM B600 treatment prior to anodizing.
Milt Stevenson, Jr.
Syracuse, New York
October 15, 2008
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