What is Passivation?

Passivation is a chemical finish process that removes free iron from the surface of stainless steel. In doing so, the raw material actually forms a thin oxide layer that protects the surface from future corrosion. Passivation is typically utilized after parts have been stamped or machined to ensure any residual contaminants from the manufacturing process have been removed.  The result is a uniform, smooth appearance, and finish. It is compliant with RoHS Directive (2011/65/EU) and can be achieved through a Nitric Acid or Citric Acid process. The Citric Acid process is more sustainable option and minimizes the overall chemical footprint of the parts being processed. 

RoHS Compliant Processes
  • AMS 2700E Method 1 Type 7
  • AMS 2700E Method 1 Type 8
  • AMS 2700E Method 2
  • ASTM A967/A967M-13 Nitric 3
  • ASTM A967/A967M-13 Nitric 4
  • ASTM A967/A967M-13 Citric 1
  • ASTM A967/A967M-13 Citric 2
  • ASTM A967/A967M-13 Citric 3
  • STM B912-02
Metal Types
  • Stainless steel
  • Improved corrosion resistance
  • Uniform, smooth appearance and finish
  • Contaminant Removal
  • In compliance with RoHS Directive (2011/65/EU)
  • Anodizing, Type II and III
  • Passivation
  • Electropolishing