Passivation is a process that makes corrosion resistant alloys corrosion resistant.  The process utilizes oxidizing acids to remove free iron from the surface of stainless steel that is present due to preceding forming and cutting manufacturing processes.  In addition to removing the free iron, a thin, dense oxide barrier is formed to provide a barrier to further corrosion.

In our efforts to be environmentally conscious, Citric Acid Passivation is the method of choice in our facility due to its low impact on the environment.  Although we prefer to use this method, we can passivate with Nitric Acid Solutions per customer requirements. 

Applicable Specifications:

QQ-P-35, AMS 2700, ASTM A380, ASTM A967, MIL-S-5002