Study Of Growth Process And Wear-Resisting Property Of Ceramic Coatings Formed By Microarc Oxidation On Aluminum Alloy

In this article, the microscopic patterns and phase constituents of ceramic coatings formed by microarc oxidation(MAO coatings) on aluminum alloy in the different treated time were analyzed, and the growth process of the coatings is studied by scanning electron microscope(SEM) and X-ray diffractometer (XRD) ; The affected factors on wear-resisting property of MAO coatings on aluminum alloy were investigated by abrasion test under the lubrication of oil.The results show that Hard MAO coatings is obtained because of plasma oxidation by microarc oxidation; There are differently directional nano line cluster quenching structures near micron level "ejecting pore" on the surface of MAO coatings, and these micropores can improve the wear-resistance of the coatings under the lubrication of oil; The run-in wear mass loss of MAO coatings increases while surface roughness and small adhesion ceramic particles of the coatings increase with the increase of current density; Single pulse energy is affected by frequency and duty ratio, .which can not be extremely big and small in order to obtainwear-resisting MAO coatings; Although it works on the run-in wear mass loss and the run-in time of the coatings, the thickness of MAO coatings doesn' t almost affect the wear-resistance of the coatings after the run-in wear under the same thchnics conditions; Therefore, excellently wear-resisting and compact MAO coatings may be achieved by opting proper technics conditions on the basis of sample material; Wear-resisting property of MAO coatings on aluminum alloy is better than that of the Cr-plating coating and the P-V-Cu cast iron under the lubrication of oil.