2O4和AlPO4相；涂層厚度和孔隙率稍有增加，厚度由8.49 μm增加到9.60 μm，孔隙率由5.05%增加到5.75%。通過干摩擦磨損實驗、浸泡實驗和電化學測試分別評估了基體和涂層的耐磨性和耐蝕性。結(jié)果表明，微弧氧化涂層明顯改善了基體的耐磨性和耐蝕性。Sn和Mn的復合添加改善了涂層的耐磨性，但其涂層的耐蝕性有所下降，涂層的磨損率由3.53×10-5 mm3·(N·m)-1減小到2.993×10-5 mm3·(N·m)-1，涂層的腐蝕電流密度由3.14×10-6 A·cm-2增加 到4.18×10-6 A·cm-2。;The effects of low-cost Sn (1wt%) and Mn (0.5wt%) composite addition on the microstructure and properties of micro-arc oxidation coatings on extruded Mg-2Al-Zn (AZ21) alloy were studied. After the addition of Sn and Mn elements to the substrate, the phase composition of the coatings remains unchanged, mainly consisting of MgO, MgAl2O4 and AlPO4 phases. The thickness and porosity of the coatings increase slightly, the thickness increases from 8.49 μm to 9.60 μm, and the porosity increases from 5.05% to 5.75%. The wear resistance and corrosion resistance of the substrates and coatings were evaluated by dry friction and wear test, immersion test and potentiodynamic polarization test. The results show that the micro-arc oxidation coating significantly improves the wear resistance and corrosion resistance of the substrate. The composite addition of Sn and Mn improves the wear resistance of the coatings, but their corrosion resistance decreases. The wear rate of the coating decreases from 3.53×10-5 mm3·(N·m)-1 to 2.993×10-5 mm3·(N·m)-1. The corrosion current density of the coating increases from 3.14×10-6 A·cm-2 to 4.18×10-6 A·cm-2."/>