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Passivation - Passivating - Chemical Passivation


Chemical Passivation

Why does stainless steel Rust? When the correct alloy has been chosen for a specific environment, and it still rusts, then something has likely affected the surface of the material. Real-world fabrication, welding and handling of stainless steel components will leave surface contaminates. These contaminates, including weld oxides and embedded particles, hinder stainless steel’s natural ability to resist corrosion. Pickling and/or Passivation can remove these surface contaminates, and allow the material to perform as it is engineered.

What is Passivation?

Passivation is the treatment of a stainless steel with a mild oxidant intended to remove free iron and other foreign matter, but which is generally not capable of the removal of heat tint or oxide scale, for the purpose of improving corrosion resistance by enhancing the formation and structure of the materials naturally forming, corrosion-resistant passive film. A material becomes passive when it becomes resistant to environmental elements such as water and air which contribute to corrosion reaction. Stainless steel and nickel alloys are auto-passivating. However, while these metals are being formed, handled or machined, trace amounts contaminates can invade the metal’s surface and effect the passive layer. The process of passivation removes any free iron, unwanted debris contaminates and oils from the surface where corrosion can initiate. This process restores the alloy to its original engineered properties, improves the appearance and extends the life of the product in many corrosive environments.

When to Passivate

Because real world fabrication and handling operations degrade the surface properties of the material, all corrosion resistant alloys benefit from passivation prior to going into service. Passivation may also be performed on a routine preventative maintenance schedule. Some companies schedule a routine passivation once a year while others passivate more frequently as a result of frequent high chloride levels.

Stainless Steel Passivation

Chemical passivation treatment removes free iron & contaminants and promotes the formation of a chromium-rich corrosion resistant layer...

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Passivation vs Pickling

Passivation and Pickling are two different processes, which produce different results...

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AL6XN Passivation

Harrison Electropolishing has performed passivation treatments on AL6XN with excellent results for a number of years...

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Hastelloy Passivation

Surface contaminants, including grease, dirt, iron, and other imbedded metallic particles are removed during the passivation process...

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Nickel Passivation

The presence of exogenous surface contaminants may adversely affect the engineered corrosion-resistant properties of Nickel alloys...

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Passivation Portfolio

View the Harrison passivation portfolio...

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