This specification covers the different types of passivation treatments as well as recommendations, guidance and precautions for cleaning and descaling corrosion-resistant parts, components, equipment and systems.

Purpose:

This specification covers the method for cleaning and descaling of stainless steel parts and outlines the final cleaning stage or passivation treatments for use on austenitic, ferritic, martensitic and precipitation hardening corrosion resistant steels. Engineering drawings and specifications should specify classification type (passivation treatment) which should be used in accordance with 1.2.1.

Types: Passivation treatments shall be of the following types, as specified (see 6.2).

Type II - Medium temperature nitric acid solution with sodium dichromate additive

Type VI - Low temperature nitric acid solution

Type VII - Medium temperature nitric acid solution

Type VIII - Medium temperature high concentration nitric acid solution