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1.1 This specification covers several different types of chemical passivation treatments for stainless steel parts. It includes recommendations and precautions for descaling, cleaning, and passivation of stainless steel parts. It includes several alternative tests, with acceptance criteria, for confirmation of effectiveness of such treatments for stainless steel parts.
1.2 Practices for the mechanical and chemical treatments of stainless steel surfaces are discussed more thoroughly in Practice A 380.
1.3 Several alternative chemical treatments are defined for passivation of stainless steel parts. Appendix X1 gives some nonmandatory information and provides some general guidelines regarding the selection of passivation treatment appropriate to particular grades of stainless steel. It makes no recommendations regarding the suitability of any grade, treatment, or acceptance criteria for any particular application or class of applications.
1.4 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.
1.5 The values stated in inch-pound units are to be regarded as the standard. The SI units given in parentheses are for information only.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A380 Practice for Cleaning, Descaling, and Passivation of Stainless Steel Parts, Equipment, and Systems
B117 Practice for Operating Salt Spray (Fog) Apparatus
B254 Practice for Preparation of and Electroplating on Stainless Steel
Federal SpecificationQQ-P-35C Passivation Treatments for Corrosion-Resistant Steels
ICS Number Code 77.140.20 (Steels of high quality)
UNSPSC Code 11171600(Stainless steel alloys)