Corrosion-Mitigating, Bondable, Fluorinated Barrier Coating for Anodized Magnesium

Report No. ARL-TR-7669
Authors: Joseph P Labukas; Noelle F Landers; Lindsey M Blohm; Victor Rodriguez-Santiago; Thomas Parker
Date/Pages: May 2016; 24 pages
Abstract: Enhanced barrier protection of magnesium (Mg) alloy AZ31B was achieved by coating oxidized Mg AZ31B H24 substrates with a perfluorinated silane. Then an atmospheric plasma treatment was used to promote adhesion of an epoxy topcoat to the silanized surface. This multistep process provides enhanced corrosion protection versus the untreated oxide as a result of accelerated corrosion testing via ASTM B117 (not shown) and electrochemical impedance spectroscopy. The adhesion of a top coat to this perfluorinated surface has been achieved and was tested using pull-off adhesion as described in ASTM D4541. Experimental work is ongoing for other anodized surfaces, various self-assembled monolayers, and alternative atmospheric plasma conditions.
Distribution: Approved for public release
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Last Update / Reviewed: May 1, 2016