Preparing Technology and Corrosion Resistance of Micro-arc Oxidation-Electrophoretic Coating on Pure Al

Micro-arc oxidation (MAO) coatings,electrophoretic deposition (EPD) coatings,and combined MAO + EPD coatings were deposited on pure Al sheets respectively.The surface and cross-sectional morphology was observed by means of SEM.The adhesion was tested by grid method and scratch test,The polarization curves and CASS tests were carried out to evaluate the corrosion resistance of the coatings.The results showed that the corrosion resistance of the combined MAO +EPD coatings was better than that of single MAO or EPD coating,and the MAO coating could improve the adhesion of Al sheets and EPD coating.