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Chromates & Passivates

Accu-Labs has developed approved chemical chromate and trivalent passivate conversion coating processes that can be found on both OEM and military QPL listings. Our products meet current military specifications MIL-5541 and ASTM D-1730.

628-DM Accu-Labs Conversion Coating

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The 628-DM conversion coating process is available as a RoHS compliant, chromium-free, dry compound alternative for corrosion protection. This coating for aluminum substrates produces a beautiful yellow-brown passivate film. Parts treated with the 628-DM conversion coating process have consistently achieved in excess of 168 hours of salt spray protection per ASTM B-117. The coating is abrasion-resistant and lends itself to good paint adhesion.

637 Accu-Labs Conversion Coating

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The 637 conversion coating process is a RoHS compliant, trivalent, chromium-based alternative for corrosion protection for most aluminum substrates. Each 637 coating provides a stable, clear, slightly iridescent trivalent finish with excellent corrosion resistance. Like our chromium-free 628-DM conversion coating process, parts treated with the 637 conversion coating processes have consistently achieved in excess of 168 hours of salt spray protection per ASTM B-117. The coating is amenable to subsequent organic coatings.

982A Accu-Labs Conversion Coating

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982A is a chromium-based blend of acid salts that was developed to produce a gold, iridescent chemical film on aluminum products. 982A will also give a clear chromate film on aluminum if used at a lower concentration and shorter time cycles. This conversion coating blend provides excellent corrosion protection and a good adhesive bond for paint. Accu-Labs 982A is notable for meeting current military specifications, including MIL-5541B-Class 1A, Class 3 and MIL-DTL-81706 Type 1, class 1A form 2 method C, and Type 1, class 3 method C.

615 Accu-Labs Conversion Coating

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615 Aluminum Dichromate is a dry, granular compound which, when dissolved in water, forms a solution for chromating aluminum and aluminum alloys. The chromate coating formed from 615 Aluminum Dichromate is typically light yellow or brown and has excellent corrosion resistance. It provides a good base for adherent paint coatings. This chromate process meets the requirements of Military Specification MIL-C-5541 for aluminum.