Passivation of 440
What is the best passivation process for 440c?Dave Mortenson
Pullbrite, Inc. - Fremont, California USA
Electropolishing is considered the best way to passivate stainless steel. What particular application did you have in mind?
Falls Township, Pennsylvania
We use the Type 8 formulation found in AMS2700 [link by ed. to spec at TechStreet], which is the same as the Type VIII found in the olde QQ-P-35C [link is to free spec at Defense Logistics Agency, dla.mil]. 45-55% nitric acid in water, 120-130F, for 30 minutes minimum. We don't use a chromate dip afterward.
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