Structure and Property of Micro Arc Oxidation Ceramic Coatings on Al Alloy in K2ZrF6 Solution

摘要

The coatings containing zirconia were produced on LY12 Aluminium alloy by micro-arc oxidation in K2ZrF6 and NaH2PO2 solution.The composition,structure,hardness,friction and wear resistance and corrosion resistance of the coating were studied by XRD,SEM,EDS,ball-on-disk friction tester and electrochemical analyzer,respectively.The results show that coating was composed ofm-ZrO2 and t-ZrO2.There were a large amount of Zr and O and a little Al,P and K in the coating.The thickness of coating prepared for 3h was 168μr and the maximum value of the hardness was up to 16.75GPa.The friction and wear resistance and corrosion resistance were improved,compared with the LY 12 aluminium alloy substrate.