prepping part before nitric passivation

nitric acid passivation

Nitric Passivation

Preventing corrosion with time-tested methods

Proven Stainless Steel Protection

Increase the longevity of your stainless steel materials

Stainless steel has naturally corrosion-resistant properties, but that doesn't necessarily mean that your equipment is completely protected. Harmful contaminants can cause passive layers to corrode away, leading to metal failure and, potentially, unplanned downtime.
Nitric acid passivation is an effective method for increasing the longevity of stainless steel materials. Using this post-fabrication process, the Armoloy Corporation and its knowledgeable team members can restore stainless steel surfaces to ensure peak corrosion resistance.

Nitric Passivation Highlights

  • Improves base substrates corrosion resistance
  • Uniform, smooth appearance, finish, and cleanliness
  • Deburring of polished surfaces
  • Improved and extended product life
  • Improved aesthetics
  • No physical or dimensional changes

Proven Applications

Utilizing nitric passivation can improve the long-term performance of applications in all the following industries:

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

Certifications & Specifications

  • AMS QQ-P-35 (Type VI)
  • ASTM A967-05 (Nitric II)
  • Sikorsky SS 8435 Rev. 8
  • MIL-S-5002D (Amend 2)

How Nitric Passivation Works

Nitric passivation is a well-established method for protecting stainless steel from rust and corrosion caused by oxidation.

By putting stainless steel into an acid bath, Armoloy’s experts can help dissolve any of the free iron on the surface while maintaining the chromium properties. The stainless steel then gets exposed to air and oxygen, which forms a chromic oxide layer that’s more protective and prevent corrosive materials from getting into the surface.

Additional Metal Treatments

Explore All Products
Passivation
nut and bolt
metal surface at x2000 magnitude after citric passivation
Citric Passivation
Citric Passivation
Natural and eco-friendly. Citric passivation uses a non-electrolytic finishing process to help industry manufactures worldwide enhance corrosion resistance.
TDC
nut and bolt
nodular thin dense chrome on surface seen at x500
Nodular Thin Dense Chrome
Nodular Thin Dense Chrome
Our thin dense chrome plating reduces the wear, friction and corrosion of components with a nodular finish.
TDC
nut and bolt
Armoloy Electrolizing microcracked thin dense chrome on surface at 500 magnification
Microcracked Thin Dense Chrome
Microcracked Thin Dense Chrome
Microcracked thin dense chrome plating offers a proprietary chemistry of pure chromium that increases both hardness and wear resistance.
TDC
nut and bolt
diamond chrome plating armoloy xadc at x500
Nodular Diamond Chrome XADC
Nodular Diamond Chrome XADC
For applications with particularly high wear rates, Diamond Chrome XADC provides a superior option to alternative metal surface treatments.
TDC
nut and bolt
armoloy biprotec nickel chrome plating on surface x500
Hybrid Coatings (Bi-Protec)
Hybrid Coatings (Bi-Protec)
Bi-Protec Nickel Chrome Plating—a combination of our high phosphorus electroless nickel coating with an overlay of Armoloy TDC® or XADC®. Bi-Protec's additional layer provides the best combination of wear and corrosion protection.
TDC
nut and bolt
electrolizing microcracked thin dense chrome and medical coating
ME-92 Biocompatible Chromium
ME-92 Biocompatible Chromium
Biocompatible Chromium Coating, known as ME-92, brings high-precision medical industry solutions throughout the world.
TDC
nut and bolt
plating aluminum with alcoat at x500
Microcracked Thin Dense Chrome For Aluminum
Microcracked Thin Dense Chrome For Aluminum
AL-COAT ensures premium protection for aluminum alloys by providing a high-chromium coating that is also both dense and non-magnetic.
Nickel
nut and bolt
electroless nickel coating from armoloy on metal surface at x500
Mid-phos Electroless Nickel Coating
Mid-phos Electroless Nickel Coating
For intricate applications susceptible to corrosion, our mid-phosphorus Electroless Nickel coating offers precise, uniform coverage for long-lasting preservation.
Nickel
nut and bolt
electroless nickel coating and nickel plating at x2000
High-phos Electroless Nickel Plating
High-phos Electroless Nickel Plating
Armoloy's High Phosphorus Electroless Nickel plating offers great corrosion resistance for components operating in acidic environments.
Nickel
nut and bolt
nickel teflon® on surface at x500
Nyflon – Nickel Teflon®
Nyflon – Nickel Teflon®
A co-deposit of electroless nickel and PTFE (Teflon®), Nyflon is the gold-standard for applications requiring increased corrosion resistance, hardness, and lubrication.

Services at Armoloy

The Armoloy Corporation is here to provide support for your project, starting from the discovery phase and continuing through a successful production launch. Whether coatings are considered during the initial part design phase or become necessary due to product failures in the field, our team can assist you at any stage in the process.

Research & Development
Fully equipped R&D plating lab for test runs, prototyping, and continual development of our plating technologies. Our turnkey approach ensures high-quality outcomes for your project.
ASTM testing for wear
Process Development & Validation
Support from design to product launch with coating selection, prototyping, testing, PPAP validation, and plating production on any scale. We also support a range of ASTM and AMS test methods with a NADCAP-certified laboratory. 
Fulfillment
Armoloy ensures the development of a robust plating process that can be distributed to one of our 16 plating facilities. We’ll handle prototyping, process validation, and much more.

How Metals Fail

Contact Armoloy

Some of the most common metal failures include:

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

Galvanic corrosion of metal washer
Galvanic Corrosion
abrasive wear and abrasive metal failure of metal bearing
Abrasive Wear
rolling contact fatigue
Rolling Contact Fatigue
erosion corrosion and erosive wear metal failure of piping due to lack of nickel chrome plating
Erosion-Corrosion
erosive wear erosion on solid surface
Erosive Wear
cavitation damage shown on metal coupon
Cavitation
pitting corrosion on metal surface without nickel plating
Pitting Corrosion
uniform corrosion of metal surface due to lack of nickel chrome plating
Uniform Corrosion
rolling contact fatigue caused by bearing friction if we don't reduce friction
Friction
prevent overheating metal failure in rail bearings
Overheating
plating aluminum improving chemical resistance
Chemical Resistance
corrosive wear of metal gear
Corrosive Wear

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Improve metal surface performance to its highest pinnacle. Meet our group of curious, innovative engineers and learn how we can help improve your industry with science-based solutions.

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