摘要
为了提高铝合金的使用寿命,以6061铝合金为研究对象,在采用微弧氧化(Micro-Arc Oxidation,MAO)技术制备的陶瓷涂层上,使用激光熔覆技术将凹凸棒土(ATP)熔覆在其表面,从而制备MAO-ATP复合涂层并考察其耐磨和耐腐蚀性能。通过扫描电镜(SEM)及其自带的能谱仪(EDS)分析了涂层的表面形貌以及元素组成,通过摩擦磨损试验和电化学腐蚀试验等手段,考察了涂层的耐磨性和耐腐蚀性。结果表明:MAO-ATP复合涂层在水润滑条件下的摩擦系数比铝基体的降低了32%,比MAO涂层的降低了21%。通过耐腐蚀试验发现,MAO-ATP复合涂层的腐蚀电位(E_0)比铝基体的提高了0.145 V,比MAO涂层的提高了0.235 V;腐蚀电流密度(J_0)比铝基体的降低了2个数量级,比MAO层的降低了1个数量级,有效提高了铝合金的耐磨性和耐腐蚀性,有望拓展铝合金的应用领域。
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 disper-sive spectroscopy(EDS).The wear resistance and corrosion resistance of the coating were investigated through friction and wear tests and elec-trochemical corrosion tests.Results showed that the friction coefficient of MAO-ATP composite coating under water lubrication conditions de-creased 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 alumi-num substrate and 1 order of magnitude compared to the MAO coating.Generally,the MAO-ATP coatings effectively improved the wear resist-ance and corrosion resistance of aluminum alloy,which was expected to promote the development of aluminum alloy in application fields.
作者
冯智
孙俊丽
白凯元
杨慧云
王泽臻
陆海林
FENG Zhi;SUN Junli;BAI Kaiyuan;YANG Huiyun;WANG Zezhen;LU Hailin(School of Mechanical and Electrical Engineering,Xi’an Polytechnic University,Xi’an 710048,China)
出处
《材料保护》
CAS
CSCD
2024年第10期78-86,共9页
Materials Protection
