Chemical Passivation Treatments for Stainless Steel Parts
This specification covers several different types of chemical passivation treatments for stainless steel parts. It includes recommendations and precautions for descalinz cleaning, and passivation of stainless steel parts. It include'"s several alternative tests, with acceptance criteria, for confirmation of effectiveness of such treatments for stainless steel parts.
Practices for the mechanical and chemical treatments of stainless steel surfaces are discussed more thoroughly in Practice A 380.
The tests in this specification are intended to confirm the effectiveness of passivation, particularly with regard to the removal of free iron and other exogenous matter. These tests include the following practices:
- 1.4.1 Practice A-Water Immersion Test,
- 1.4.2 Practice B-High Humidity Test,
- 1.4.3 Practice C-Salt Spray Test,
- 1.4.4 Practice D-Copper Sulfate Test,
- 1.4.5 Practice E-Potassium Ferricyanide-Nitric Acid Test, and
- 1.4.6 Practice F-Free Iron Test.