Dear Technetters,

There does not appear to be an industry standard acid resistance test for
determining the functional quality of a reduced black oxide layer. The acid
resistance test is a good method for determining the quality with respect to
pink ring resistance.

Several companies and indeed suppliers have different methods for testing this
functionality of the Reduced Oxide process.

So I thought it might be worthwhile firing these questions off around the
world :
What method is used at your shop to test the acid resistance of your Reduced
Black Oxide process - in terms of acid type - strength and application method
and when is it tested?

If you are using an alternative oxide or oxide replacement do you still carry
out an acid resistance test?

Russ Gregory
Atotech UK

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