3Zn6Y相。添加Cu元素后，合金出現(xiàn)了MgZnCu相，并且MgZnCu相的含量隨著Cu含量的增加而增加。電化學和浸泡試驗結果表明，添加Cu后Mg-3Zn-1Y-xCu合金的耐腐蝕性能下降，這是因為受到了合金微觀組織和腐蝕產物膜性能的影響。具有高電化學電勢的MgZnCu相作為強陰極加速了微電偶腐蝕。腐蝕產物膜防護性能的下降源于相應化合物PBR值的改變。;The microstructure and corrosion behaviour of hot-rolled Mg-3Zn-1Y-xCu alloys (x=0, 1, 3, 5, wt%) were investigated. Results show that all Mg-3Zn-1Y-xCu alloys mainly consist of α-Mg matrix and Mg3Zn6Y phases. The addition of Cu element promotes the formation of MgZnCu phase, and the amount of MgZnCu phase is increased with the increase in Cu content. Electrochemical and immersion test results show that the corrosion resistance of Mg-3Zn-1Y-xCu alloys is deteriorated after Cu addition, which can be attributed to the influence of the microstructure of alloys and the properties of the formed corrosion product film. The MgZnCu phase with high electrochemical potential accelerates the micro-galvanic corrosion as strong cathodic sites, and the decreased protection effect of the corrosion product ?lm results from the variation in PBR value of the related compounds."/>