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Trivalent Chromate Coating

We offer cost-effective trivalent chromate conversion for functional and protective passivation of aluminum parts and components.

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Superior Results for Better Performance

Our process meets mil spec MIL-DLT-5541 Type II Class 1A and Class 3, and delivers numerous benefits.

Benefits of Trivalent Chromate Coating

  • Corrosion-resistant
  • Maintains electrical conductivity
  • Primer for paint and lacquer
  • Enables rubber bonding
  • Low-cost
  • No measurable build-up
  • Non-hexavalent chromium
  • Non-toxic
  • RoHS and WEEE compliant
  • Heat tolerable
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Metallic Mesh

Supporting Industrial Applications

Numerous industries rely on our trivalent chromate passivation because of the broad range of industrial and commercial uses.


Common Uses for Trivalent Coatings

  • Aluminum heat sinks
  • Wire housings
  • Fasteners
  • Hydraulic fittings
  • Decorative plating
  • Aerospace and maritime housings
  • Cast aluminum parts
  • Bushings
  • Aluminum electronic housings and components
  • And more


A conversion coating is a chemical treatment applied to manufactured parts that superficially converts the material into a thin coating of an insoluble compound. These coatings are commonly applied to protect the part against corrosion, improve adherence of other coatings, lubrication, or decoration.

Our chromate conversion coating for aluminum involves the following steps:

  • Degreasing and rinsing to remove oil, grease, oxides, and heavy metallic impurities
  • Deoxidize and desmut
  • Chromate treatment by immersion
  • Rinse
  • Dry

Due to its broad range of capabilities, chromate conversion coatings are utilized throughout a wide range of industries including:

  • Automotive
  • Aviation & Aerospace
  • Buildings & Architecture
  • Electronics
  • Marine
  • Medical/Dental Equipment
  • Military/Law Enforcement
  • Sporting Goods

At Arrow Cryogenics we use a unique chemical solution for our chromate conversion coatings. Our conversion coatings are hexavalent free and are compliant with NADCAP, RoHS and WEEE directives. Arrow Cryogenics is also ISO 9001:2015 certified.

Chromate conversion coatings have been in use since at least the 1960s; however, the hexavalent chromium chemicals used have been found to be highly toxic. Arrow Cryogenics uses a unique chemical solution for our chromate conversion coatings that does NOT contain hexavalent chromium.


AC7108 REV I – NADCAP Audit Criteria for Chemical Processing

  • AC7108 Anodize; Hard Anodize and Sulfuric Anodize (Not for Metal Bond) – AC7108/8 must also be selected
  • AC7108 Chromate (non-hexavalent)
  • AC7108 Passivation
  • AC7108 Electropolish
  • AC7108 Standalone Cleaning
  • AC7108 Descaling
  • AC7108 Solution Analysis & Testing – AC7108/4 must also be selected
  • General Cleaning & Pre-Cleaning
  • Alkaline Cleaning
  • Chemical Cleaning
  • Titanium Cleaning
  • Emulsion Cleaning
  • Semi-Aqueous Cleaning
  • Solvent Cleaning
  • Ovens for Thermal Treatments – Heat Processing; Part Dying
  • Stripping of Coatings
  • Inorganic Coatings
  • Other Stripping

AC7108/4 REV C – NADCAP Audit Criteria for Solution Analysis and Testing in Support of Chemical Processing to AC7108

  • Solution Analysis (In Support of AC7108)
  • Testing Performed Internally (In Support of the Chemical Process Accreditation)
  • B05 – Salt Spray Testing (In Support of Chemical Process Accreditation)
  • B06 – Water Immersion / Humidity Testing (In Support of AC7108)
  • B09 – Taber Wear Testing (In Support of AC7108)
  • B10 – Adhesion Testing (In Support of AC7108)
  • B13 – Coating Weight Testing(In Support of AC7108)
  • B 14 – Conductivity Testing (In Support of AC7108)
  • B15 – Resistivity Testing (In Support of AC7108)
  • B16 – Coating Thickness Measurement (In Support of AC7108)
  • B23 – Other Testing (In Support of AC7108)

AC7108/8 – NADCAP Audit Criteria for Anodizing (Not for Metal Bond)

  • Anodized Aluminum, Hard Anodize
  • Anodize Aluminum, Sulfuric Acid
  • Dye
  • Seal

AC7108/11 – NADCAP Audit Criteria for Conversion Coating

  • Aluminum, Non-Hexavalent Chrome Alternatives

AC7108/12 REV A – NADCAP Audit Criteria for Standalone Cleaning, Descaling, Passivation, and Electropolishing

  • Passivation


Your Single Source of Total Solutions

We look beyond today to increase efficiency and serve your business.

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Learn about Medical

We finish your materials within tight tolerances to meet exacting quality and regulatory demands.

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Learn about Military

Defense contractors rely on our anodizing, laser-marking, descaling, and other services to meet military specifications.

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Learn about Aerospace

We offer a range of finishing services for aerospace components and maintain NADCAP certification


Precision Manufacturing

Learn about Precision Manufacturing

CNC manufacturers rely on our services to complete final finishing.

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Learn about Pharmaceutical

We innovate processes in the science and art of finishing precision-engineered pharmaceutical components.

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Water Purification

Learn about Water Purification

Our services for finishing water-system components include cryogenic deflashing, passivation, and laser marking.

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Learn about Automotive

Our precision capabilities handle high-volume jobs for automotive OEMs.

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Learn about Computing

We offer anodizing and laser marking of components and enclosures for computers and audio equipment.

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Learn about Electronics

Our finishing services meet critical tolerances for metal and plastic parts made for consumer electronics.

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Food Service

Learn about Food Service

Our cleaning and finishing services meet strict regulatory requirements while enhancing performance and longevity.

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Learn about Hydraulics

Our deburring, deflashing, and other services optimize the operating life of hydraulic equipment.



Learn about Firearms

Our suite of capabilities delivers precise results producing the highest quality finishes.

Nadcap Administered by PRI Accredited
ISO 9001:2015
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NSSF - The Firearm Industry Trade Association
NADCA - North American Die Casting Association
MPMA - Minnesota Precision Manufacturing Association


Finished Means Finished. Done

We eliminate the need for your parts to go elsewhere.

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