passivation
Stainless Steel Specification ASTM A-967
Metal Finishing
Specialty Process
Information
Certifications
ISO 9001:2000/
AS9100 Rev B
NADCAP Certified
Passivation Improves Corrosion Resistance
What Is Passivation?
Passivation is a chemical treatment for Stainless Steel, not an electrochemical process.
Removes Metallic Impurities From Stainless Steel
When Stainless Steel is machined, stamped, drawn, heat treated or in any way worked with, it is possible that its corrosion resistance has been compromised by the presence of metallic (primarily iron) or other impurities on the surface. By immersing the formed part in a Passivating Solution, these impurities can be removed leaving a surface layer that is rich in chromic oxides.
Why Stainless Steel Is "Stainless"
Chromic oxides are extremely corrosion resistant and are the major factor as to why stainless steel is “stainless.” Passivated surfaces are also fingerprint resistant.
About Passivation Baths
Passivation baths are typically Nitric Acid or Citric Acid based. The composition of the stainless steel alloy is usually the determining factor in choosing which bath is used.
Passivation Specifications
Hi-Tech passivates stainless steel part to specifications ASTM A-967. (QQ-P-35C is still in widespread use but has been superseded by the ASTM spec.)
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