Evaluation of Commercial-Off-the-Shelf Chrome-Free Pretreatments for Aluminum Substrates
Technical Report,03 Mar 2014,09 Mar 2018
CCDC Army Research Laboratory Aberdeen Proving Ground United States
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The objective of this work was to determine what products were commercially available that were chrome-free and could be used in place of hexavalent or trivalent chromium conversion coatings for both aviation and ground equipment as part of the Chemical Agent Resistant Coating CARC system. This work also looked at alternative ways to test chrome-free conversion coatings since the methods in MIL-DTL-81706 are specifically for chrome-containing systems. The results of this testing conducted at the US Army Research Laboratory provided critical data that showed there are chrome-free commercially available products that can perform as part of the CARC system, and that the use of a galvanic panel with titanium and stainless steel fasteners can quickly delineate good-performing coatings systems in a lab setting. Outdoor corrosion testing at Cape Canaveral Air Force Station showed similar results as lab testing with the galvanic panels.
- Coatings, Colorants and Finishes