Verification and Demonstration for Transition of Nonhexavalent Chromium, Lowâ??Volatile Organic Compound (VOC) Alternative Technologies to Replace DOD-P-15328 Wash Primer for Multimetal Applications

Report No. ARL-TR-8169
Authors: John Kelley; Thomas Considine; Thomas Braswell; Alicia Farrell
Date/Pages: September 2017; 53 pages
Abstract: The DOD-P-15328 wash primer is used to passivate metal surfaces to protect against corrosion and improve the adhesion of the subsequent primer to the base metal. The wash primer contains hexavalent chromium (Cr(VI)) and volatile organic compounds (VOCs) that are risks to both human health and the environment. A memo released by the Office of the Secretary of Defense in 2009 specifically directs the military to approve the use of alternatives to Cr(VI) where they can perform adequately for the intended application. This effort examines the effectiveness and demonstrates the feasibility of alternative spray-applied pretreatments for multimetal substrates as a replacement for DOD-P-15328 hexavalent chrome containing wash primer. Eight nonchromate alternative candidates were assessed against the baseline wash primer. The results show that there are viable alternatives that can provide comparable, and in some cases improved, performance to the legacy wash primer. One such candidate, a nonchromate, low-VOC product, compared very well with the baseline wash primer and is a viable drop-in replacement. Furthermore, we found that the DOD-P-15328 wash primer would not meet some of the requirements of TT-C-490F and would not be approved for use in many of the applications today. The approval of multiple candidates to populate the TT-C-490F qualified product database has prompted the US Army Research Laboratory to cancel the wash primer specification on September 30, 2017, and directs users to begin transitioning toward full implementation of TT-C-490F type III and IV pretreatments on military systems that currently rely on DOD-P-15328.
Distribution: Approved for public release
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Last Update / Reviewed: September 1, 2017