Keystone Corporation has been providing stainless steel passivation, pickle passivation and electro polishing services for many years. Our process control coupled with our expertise in treating stainless steel insures that your parts will come out perfectly every time. We have the capability to process parts for pickle passivation up to 10 feet in length and weights up to 2 tons.  


Passivation/Pickle passivation - The passivation of stainless steel is performed when free iron, oxide scale, rust, iron particles, metal chips or other nonvolatile deposits might adversely affect the metallurgical or sanitary condition or stability of the surface, the mechanical operation of a part, component or system, or contaminate the process fluid.

Passivation is performed on clean stainless steel, providing the surface has been thoroughly cleaned or descaled. Since the term "passivation" is used to describe distinctly different operations or processes relating to stainless steels, it is necessary to define precisely what is meant by passivation.


Electro polishing - Is an electrochemical process similar to, but the reverse of, electroplating. The electro polishing process smoothes and streamlines the microscopic surface of a metal object. As a result, the surface of the metal is microscopically featureless, with not even the smallest speck of a torn surface remaining.




Keystone offers the following processes for  Stainless Steel:


  • Passivation- QQ-P-35 OR AMS-QQ-P-3
  • ASTM A 967, Chemical Passivation Treatments for Stainless Steel Parts
  • ASTM A 380, Standard Practice for Cleaning, Descaling, and Passivation of Stainless Steel Parts, Equipment and Systems
  • Federal Specification QQ-P-35C, Passivation Treatments for Corrosion Resistant Steels
  • ASTM B 912, Passivation of Stainless Steels Using Electro polishing




Keystone stainless steel treatments have proved invaluable in countless industrial and machined parts applications. Some traditional uses of Keystone stainless steel treatments include:

  •   Automotive
  •   Military
  •   Aerospace
  •   Machinery
  •   Communications
  •   Electronics

Plated metal parts