PROPERTIES OF CERAMIC COATING OBTAINED BY MICRO-ARC OXIDATION OF HOT-DIP ALUMINUM COATING ON Q235

The ceramic coating was obtained by the method of micro-arc oxidation of the hot-dip aluminum coating on Q235.The corrosion resistance,wear resistance,hardness of the ceramic coating were measured.The corrosion resistance of the micro-arc oxidized samples was much better than that of the hot-dip aluminum samples in either NaCl electrolyte or sea water.And the corrosion resistance of both the micro-arc oxidized samples and the hot-dip aluminum samples was worst in 10% NaCl electrolyte.The wear resistance of the ceramic coating was more than 3 times of the heat treated 45# steel when the wear distance was 70 meters.The hardness of the ceramic was about 11 times of the Q235 steel.