Passivation Services

H&W Global

Passivation: Nitric & Citric

  • ASTM-A380
  • ASTM-A967
  • QQ-P-35
  • AMS-2700

Passivation Services

H&W Global Industries, offers stainless steel passivation services, utilizing both nitric and citric acids. Typically part of other coating processes, passivation of stainless steel is a process to make stainless steel "passive," which means to stop the activity of rust and ready the part for industrial coatings.

Passivation Services

We take special care in selecting a passivation service treatment that will target the contaminant to properly aid in the development of the chromium-oxide passive film on the surface of the stainless steel.

Our passivation processes assure removal of free iron or other less noble contaminants from the surfaces of corrosion-resistant steel parts. We remove metallic contaminates using chemically oxidizing methods to prevent injury to the base metals. Passivation does not usually result in a marked change in appearance of the stainless steel surface.

Pickling and Passivation of Stainless Steel

H&W Global Industries adheres to the standards set forth by SSPC (The Society for Protective Coating) for pickling and passivation of stainless steel and metal preparation.

Contamination on the surface of stainless steel causes corrosion over time. Pickling passivation is the removal of any high temperature scale and any adjacent low chromium layer of metal from the surface of stainless steel by chemical means. This chemical treatment is applied to the surface to remove these contaminants to allow for a continuous chromium-oxide, passive film. In order for pickling passivation treatments to be fully effective, all heavy deposits of oil, grease, soil, drawing compounds and foreign matter are removed from the metal. Pickling then removes rust, scale, and oxide.

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