What Is The Process Of Passivation?

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what is passivation

 

Passivation is a method of chemically treating stainless steel and other alloys to enhance the surface of the metal against rust and corrosion. This non-electrolytic finish process is essential for protecting the metal parts after machining.

Get to know more about the process of passivation as you go through today’s blog entry.

How Does It Work?

Passivation makes use of a nitric acid solution to remove free iron particles from the surface of metal parts. Once the solution is applied to the alloy, it will trigger a reaction that will create a sort of thin “film” oxide layer on the surface.

By chemically treating the stainless steel’s surface and other metal parts, it will create more chromium into the surface as the metal is exposed to the air. And therefore, resulting in a non-reactive metal surface that is more resistant to corrosion.

As per common specifications of passivation ASTM A380 and A967, passivation is specified as the removal of any exogenous iron and/or iron compounds from the stainless steel’s surface by applying a chemical dissolution or acid solution to remove any particles that cause contamination without affecting the metal itself.

In addition to this, ASTM A380 also states that the process of passivation is a type of chemical method of treating stainless steel using a mild oxidant like nitric acid to cause a spontaneous formation of the protective passive film.

Currently, the following methods of passivation used are:

  • Tank Immersion
  • Circulation
  • Spray Application
  • Gel Application

Why It’s Necessary To Do Passivation?

Although the process of passivation naturally occurs in chromium-rich and corrosion resistant metals, the machine parts need to be placed into service after every use as it leaves behind certain particle contaminants such as inclusions, metal oxides, tramp iron, and fabrication debris which affects the metal’s ability to repel corrosion.

What Are The Benefits Of Using Passivated Systems And Equipment?

  • It removes surface contamination
  • It protects the product from contamination
  • It increases corrosion resistance
  • It increases the lifespan of metal parts and equipment
  • It allows you to extend the intervals of system maintenance

Final Word

Overall, the process of passivation is a vital element in biotechnology, pharmaceutical, semiconductor, and aerospace industries to ensure the efficiency of machinery and equipment and to avoid compromising the quality of manufactured products.

To have the best results in passivation, choose a company that has mastered the chemistries and processes of passivation. Likewise, this company should use environmentally-safe chemicals that are capable of creating an optimized passive layer on the stainless steel surface. And above all, it should meet the industry’s standards at all times. If you’re looking for a company offers passivation and other precision cleaning services in Florida, you can check out The Precision Company’s site and contact them to learn more about their industrial cleaning services.

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