Intended to improve the corrosion resistance
of parts made from austentic, ferritic and martensitic corrosion-resistant
steels of the 200, 300 and 400 series and precipitation hardened corrosion-resistant
steels. 440C grades may be exempt from passivation treatments at the discretion
of the procuring activity. The types of passivating is alloy specific.
Type II: Medium temperature
nitric acid solution with sodium dichromate additive.
Type VI: Low temperature nitric
Type VII: Medium temperature
nitric acid solution.
Type VIII: Medium temperature
high concentration nitric acid solution.