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Verification Tests for Cobalt Chrome Passivation  

May 12, 2009

Hi All,

I work for a manufacturer of We currently passivate a range of stainless steels in Citric or Nitric solution (depending on customer requirements) and use Copper Sulphate and Boil tests as verification methods.

We are now looking to passivate some cobalt chrome implants in Nitric Acid. Can anyone suggest any verification methods for testing the effect of the passivation on cobalt?


Thanks

James Dodds
Quality Engineer - Sheffield, United Kingdom

James,
Passivation tests for stainless steel are checks for the presence of free iron on the surface, and you would want a passivation test for non-ferrous alloys such as your cobalt chrome to do the exact same thing. Go ahead and use copper sulfate and/or the boil test.

Ray Kremer Stellar Solutions, Inc. McHenry, Illinois