, Volume 48, Issue 2, pp 171-175

Effect of chromate conversion coatings on the adhesion and corrosion resistance of painted 5083 aluminum alloy

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The surfaces of 5083 aluminum alloy were coated with chromate conversion coatings. Then epoxy paints were applied to the chromate and nonchromate treatment surfaces. The adhesion, hardness, and corrosion resistance of the coated samples were evaluated by using adhesion tape tests, pencil hardness tests, salt spray, and electrochemical technique. The results indicated that the adhesion of coating systems (including chromate treatment) was better than the adhesion of nonchromate conversion coatings, whereas the hardness of the coating systems was identical. The salt-spray results showed that the corrosion propagation from the scratched area in the painted samples with chromate treatment was lower than for the nonchromate coated surfaces. In addition, the electrochemical corrosion measurements indicated that the coating system including chromate treatment presented lower corrosion current densities, higher polarization resistance, and less negative corrosion potential than the corresponding values obtained for the nonchromate conversion coated surfaces.

Published in Fizyko-Khimichna Mekhanika Materialiv, Vol.48, No.2, pp.47–50, March–April, 2012.