Passivation

Passivation uses an acid solution to remove free iron from the surface of stainless steel, creating or restoring the passive oxide layer that protects against further oxidation. Parts must be free of dirt, scale, and weld residue before passivation; the process does not polish or change the finish. CMP passivates in nitric acid solutions in multiple tanks, each meeting a range of specification requirements. Passivation is verified in our facility by copper sulfate, salt spray, and 24-hour water immersion testing.