Influence of Er content on microstructure and corrosion resistance of Zn-Al-Mg alloys
In order to study the effect of Er element addition on the microstructure and corrosion resistance of Zn-Al-Mg alloy,four kinds of alloys with different compositions were melted separately,namely Zn-1.7％A1-1.1％Mg-0.1％Er,Zn-1.7％Al-1.1％Mg-0.5％Er,Zn-7％Al-2％Mg-0.1％Er,and Zn-7％Al-2％Mg-0.5％Er.The micro-structure and precipitated phase of the alloys were observed by SEM.The composition of different microstructures and phases was analyzed by EDS,and the proportion of precipitated phases was determined by XRD.The area frac-tion and distribution of Er2Zn17 in quaternary alloys with different compositions were studied by EPMA analysis.The Tafel curve and Nyquist curve were tested to study the corrosion resistance of alloys with different composi-tions.The results show that the corrosion current density of Zn-1.7％Al-1.1％Mg-0.5％Er alloy is lower than that of Zn-1.7％Al-1.1％Mg-0.1％Er alloy,and the corrosion current density of Zn-7％Al-2％Mg-0.5％Er alloy is low-er than that of Zn-7％Al-2％Mg-0.1％Er,indicating that the corrosion resistance of the alloy is further improved with the increase of Er content.The final results indicate that the addition of Er element can refine the microstruc-ture of the alloy and improve its corrosion resistance
Er added Zn-Al-Mg quaternary alloysolidified microstructurecorrosion resistanceEr2Zn17self-cor-rosion current
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