Study on the Wear Resistance and Corrosion Resistance of 6061 Aluminum Alloy Micro-Arc Oxidation and Laser Cladding Attapulgite Composite Coating

Abstract

In order to improve the service life of aluminum alloy，6061 aluminum alloy was taken as the research object.On the ceramic coating prepared by micro arc oxidation (MAO) technology， attapulgite (ATP) was melted on its surface using laser cladding technology， thus preparing MAO-ATP composite coating and examining the wear resistance and corrosion resistance of composite coatings.Moreover，the surface morphology and elemental composition of the coating were analyzed using scanning electron microscopy (SEM) and its built-in energy dispersive spectroscopy (EDS).The wear resistance and corrosion resistance of the coating were investigated through friction and wear tests and electrochemical corrosion tests.Results showed that the friction coefficient of MAO-ATP composite coating under water lubrication conditions decreased by 32%compared to the aluminum substrate and 21%compared to the MAO coating.Through corrosion resistance tests， it was found that the corrosion potential (E0) of the MAO-ATP composite coating increased by 0.145 V compared to the aluminum substrate and 0.235 V compared to the MAO coating.Additionally， the corrosion current density (J0) was reduced by 2 orders of magnitude compared to the aluminum substrate and 1 order of magnitude compared to the MAO coating.Generally， the MAO-ATP coatings effectively improved the wear resistance and corrosion resistance of aluminum alloy， which was expected to promote the development of aluminum alloy in application fields.

Keywords

• micro-arc oxidation (mao)； 6061 aluminum alloy； laser cladding； mao-atp composite coating； wear resistance； corrosion resistance