Verification and Demonstration for Transition of Non–Hexavalent Chromium, LowVOC Alternative Technologies to Replace DOD–P–15328 Wash Primer for Multimetal Applications

Report No. ARL-TR-7244
Authors: John Kelley; Thomas Considine; Thomas Braswell
Date/Pages: March 2015; 65 pages
Abstract: It has been known for quite some time that chemical treatments containing hexavalent chromium [Cr(VI)] are risks to both human health and the environment. In April of 2009, a memo was released from the Office of the Secretary of Defense (OSD) that specifically directs the military to approve the use of alternatives to Cr(VI) where they can perform adequately for the intended application and operating environment. Effectively, the memo directs Department of Defense (DOD) Military Departments to restrict the use of Cr(VI) unless no cost-effective alternative with satisfactory performance can be identified. This effort examines the effectiveness of alternative spray applied pretreatments for steel substrates versus DOD-P-15328 chromated wash primer. Eight nonchromate alternative candidates were evaluated against the baseline wash primer and untreated controls on multiple metal substrates, steel, galvanized steel, stainless steel, and aluminum (Al). The laboratory results identified 3 promising alternatives to the DOD-P-15328 with 1 outperforming the baseline chromate wash primer.
Distribution: Approved for public release
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Last Update / Reviewed: March 1, 2015