Purpose of this type of coating is cleaning the surfaces of corrosion resistant steels, removing the oxide layer from surface and creating a film layer which passives the surface. Passivation treatment should be made according to the alloy of the steel part. Classifications are made according to different types of solutions and types on passivation treatments.
Coating performance is calculated by Corrosion Resistance and Copper Sulphate Tests.
SAE-AMS-2700, ASTM-A967M and QQ-P-35C (These are the main international standards, it can also be customer standards as well.)