Examination of Spray-Applied Oxsilan 9810/2 Steel Pretreatment on a Mine Resistant Ambush Protected (MRAP) Vehicle

Report No. ARL-TN-578
Authors: Jack Kelley; Tom Braswell
Date/Pages: October 2013; 28 pages
Abstract: The objective of this demonstration is to show the viability of a nonchromate conversion coating for high-hard armor (HHA) steel on Mine Resistant Ambush Protected (MRAP) vehicles, in order to improve the long term corrosion resistance of the low-volatile organic compound Chemical Agent Resistant Coating (CARC) system. The product demonstrated here is Oxsilan 9810/2, manufactured by Chemetall Inc., which satisfies the hexavalent chrome prohibition while minimizing environmental impact and worker safety. The results of a previous demonstration of Oxsilan 9810/2 on Stryker vehicles was consistent with laboratory tests conducted at the U.S. Army Research Laboratory (ARL). However, the MRAP demonstration resulted in a discoloration of the HHA. Follow up experiments were conducted to ascertain the cause of the discoloration. These results indicate that a combination of events contributed to the corrosion-like appearance of the MRAP. The flow rate of the Oxsilan 9810/2 was insufficient to convert the steel surface on a large scale of the full-size vehicle. The bare abrasive blasted surface of the vehicles was likely contaminated when left unprotected for 72 hours (h) prior to the application of the pretreatment. This likely would have affected the reaction of the Oxsilan 9810/2 with the steel surface.
Distribution: Approved for public release
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Last Update / Reviewed: October 1, 2013