Er(NO_(3))_(3)/La(NO_(3))_(3)掺杂比值对镁合金MAO涂层硬度和摩擦性能影响

Influence of La(NO_(3))_(3)/Er(NO_(3))_(3)Doping on Hardness and Friction Behavior of AZ31 MAO Coating

尝试利用微弧氧化技术在AZ31镁合金表面制备陶瓷涂层,探究微弧氧化电解液中La(NO_(3))_(3)/Er(NO_(3))_(3)掺杂含量对AZ31镁合金微弧氧化涂层显微硬度和摩擦因数等的影响。利用XRD、SEM、显微硬度计以及摩擦磨损设备研究La(NO_(3))_(3)/Er(NO_(3))_(3)掺杂含量变化对AZ31镁合金微弧氧化涂层相组成、金相组织、显微硬度、表面粗糙度以及摩擦性能的影响。在微弧氧化电解液La(NO_(3))_(3)/Er(NO_(3))_(3)掺杂镁合金涂层主要由MgSiO_(4)、MgSiO_(3)和MgO等晶相组成。即使掺杂量不同时,镁合金涂层表面粗糙度5~10μm。La(NO_(3))_(3)/Er(NO_(3))_(3)掺杂对镁合金涂层表面形貌和粗糙度影响不大,但对显微硬度影响作用较大,与原始镁合金相比,其显微硬度增加约88%~220%。在电解液中掺杂Er(NO_(3))_(3)含量增加,镁合金涂层的摩擦因数略有升高。

In view of the poor wear resistance of magnesium alloy,ceramic coating on AZ31 magnesium alloy surface was prepared by micro-arc oxidation technology.So the influence of La(NO_(3))/Er(NO_(3))doping content in micro-arc oxidation electrolyte on the micro-hardness and friction coefficient of AZ31 magnesium alloy micro-arc oxidation coating were investigated.The influence of La(NO_(3))/Er(NO_(3))doping on the phase composition,microstructure,microhardness,surface roughness and friction coefficient of AZ31 magnesium alloy micro-arc oxidation coating was studied by XRD,SEM,microhardness tester and friction and wear equipment.The magnesium alloy coating was mainly composed of Mg,MgO,MgSiO_(3)and MgSiO_(4).The surface roughness of magnesium alloy coating varied in the range of 5~10μm,even if the doping amount was different.The doping of La(NO_(3))/Er(NO_(3))had little influence on the surface morphology and roughness of magnesium alloy coating,but had a great influence on the microhardness.Compared with the original magnesium alloy,the microhardness increased by 188%~220%.When the content of Er(NO_(3))in electrolyte increased,the friction coefficient of magnesium alloy coating increases slightly.