Scope. 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
Passivation of Stainless Steel to ASTM A967. Five nitric and citric methods are listed as follows: Nitric 1: 20-25 v% Nitric Acid, 2.5 w% Sodium Dichromate, 120-130F, 20 Mins minimum. Nitric 2: 20-45 v% Nitric Acid, 70-90F, 30 Mins minimum. Nitric 3: 20-25 v% Nitric Acid, 120-140F, 20 Mins minimum. Nitric 4: 45-55 v% Nitric Acid, 120-130F, 30
: Designation: A 967 – 05 e1Standard Specif i cation forChemical Passivation Treatments for Stainless Steel Parts 1This standard is issued under the f i xed designation A 967; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision.
1. fA 967 – 05. passivation may also include the removal of sulfides from the surface of the metal for the purpose of maximizing corrosion resistance. 3.1.1.2 The formation of the protective passive film on a stainless steel, also called passivation in a more general context, will occur spontaneously in air or other oxygencontaining
Nitric1—The solution shall contain20to25volume percent of nitric acid and2.5+0.5weight percent of sodium dichromate.The parts shall be immersed for a minimum of20 min at a temperature in the range from120to130F (49to 54 C.°° Nitric2—The solution shall contain20to45volume percent of nitric acid.The parts shall be immersed for a …
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Stainless steel: ASTM A380 / ASTM A967 / BS EN 2516 – General about Passivation! Date: January 1, 2020 Author: Thanh Nguyen Le 0 Comments The process of passivation, is a post-fabrication acid treatment that removes "free iron" contamination left behind on the surface of the stainless steel from machining and fabricating.