Abstract
In this paper, Cr2O3 coatings were prepared on the 7075 Al alloys by cathode plasma electrolytic deposition (CPED) method in the trivalent chromium (CrCl3 · 6H2O) electrolytes. The effects of the concentrations of the CrCl3 · 6H2O and the deposition voltages on the phases and structures of the coatings were investigated by SEM, EDS, XRD and electrochemical test. The results showed that the electrolyte of 30 g l−1 CrCl3 · 6H2O was benefit for the formation of a coating with non-rough and sintered structure. The coating formed at the voltage of 240 V was relatively dense and showed better resistance to the corrosion. The formation mechanism of the Cr2O3 coating was disclosed.
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