Fabrication of Cr based electrodeposited composite film using nano ZrO2 particles on aluminum substrate

Abstract

Abstract In this study, the coating method suitable for producing high-quality film on aluminum substrate was investigated by using different surface treatment to each specimen before electrodeposition. Microstructure of coating cross section was observed with Electron Prove Micro Analyzer (EPMA). Vickers hardness of coating surface was measured. The measurement of polarization behavior of aluminum in CrO3-H2SO4 electrolyte with ZrO2 addition was carried out to investigate corrosion resistance. The addition of ZrO2 particles increased Vickers hardness of Cr coating. The existence of Zr in the coating was confirmed by point analysis from coating cross section. Polarization point was shifted higher by dispersing ZrO2 particles into the plating bath, and this means that corrosion resistance was improved by the addition of ZrO2 particles.