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components ready for thin dense chrome plating after citric passivation

stainless steel passivation

Natural Corrosion Solutions

Combining superior innovation with environmental consciousness


Put Metal Corrosion in the Past

Nitric acid was once seen as the only passivation method to prevent stainless steel corrosion. Though naturally corrosion-resistant, harmful contaminants can still breach the surface of stainless steel and wear away its passive layer.
Dedicated to remaining on the cutting-edge of metal corrosion prevention, The Armoloy Corporation utilizes a more effective passivation method that's both natural and eco-friendly. Known as citric passivation, we use this non-electrolytic finishing process to help industry manufactures worldwide enhance corrosion resistance.

Armoloy Citric Passivation Highlights

  • Natural process using citric passivation
  • Environmentally friendly
  • Restores natural chromium oxide layer
  • Maximizes the corrosion resistance for most stainless steels (including all 300/400 series SS)
  • Removes free iron particles

Proven applications

Utilizing citric passivation can improve the long-term performance of applications in all the following industries.

  • Food & Beverage
  • Medical
  • Aerospace
  • Semiconductor
  • Military


  • AMS 2700
  • ASTM A380
  • ASTM A967

The Science Behind Citric Passivation

While high chrome content makes stainless steel naturally corrosion-resistant, it does not prevent harmful contaminants from breaching its surface. As a non-electrolytic finishing process, citric acid passivation removes free iron particles and other surface contaminants from the material’s surface resulting from manufacturing processes, creating a passive oxide layer that maximizes corrosion resistance.

Not only highly effective, citric passivation offers the versatility to provide this same effect for nearly all stainless and high chromium steels. But what makes citric passivation a superior alternative to nitric passivation lies in its process. The citric acid used during passivation is not only much safer, but is also organic, non-hazardous, and ensures no toxic fume emissions.

Because of its environmental benefits and effectiveness compared to nitric passivation—confirmed through multiple studies—industry manufacturers around the world turn to Armoloy for our citric passivation capabilities. Our team offers the capability of providing innovative solutions customized to the requirements of both your application and industry.

Additional Metal Treatments

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How Metals Fail

Some of the most common metal failures include:

Armoloy’s different metal coating solutions help industries avoid costly metal failures and unplanned downtime.

Partner With Us

Eliminate metal wear and friction from your operations. Meet our group of curious, innovative engineers and learn how we can help improve your industry with science-based solutions.