为研究合金元素Sr对ZA35合金耐腐蚀性能的影响,采用电化学工作站测试ZA35和ZA35-0.15Sr两种合金在20,40,60℃NaOH 溶液中的开路电位和极化曲线,结合合金组织和表面腐蚀形貌,探讨了Sr对ZA35合金电化学腐蚀性能的作用规律。结果表明:两种合金的开路电位均随NaOH 溶液温度升高而降低,相同温度下,ZA35-0.15Sr合金的开路电位较ZA35高;两种合金在弱极化时发生活化溶解,在强极化时发生钝化,相同温度下,ZA35-0.15Sr合金的耐腐蚀性能较ZA35合金高;Sr对ZA35合金晶粒及枝晶的细化效果明显,从而提高了合金在NaOH 溶液中的耐腐蚀性能.

The open-circuit potential and polarization curve of ZA35 and ZA35-0.15Sr alloys in NaOH aqueous solution at 20℃,40℃ and 60℃ were studied by means of electrochemical workstation for studying the effect of alloying element Sr on corrosion resistance of ZA35 alloy. The result shows that: when thetemperature is elevated, the open-circuit potential of alloys are gradually shifted in the negative direction, the open-circuit potential of ZA35-0.15Sr alloy is higher than that of ZA35 alloy at the same temperature; Both of the alloys dissolve during weak polarization and passive during strong polarization, the corrosion resistance of ZA35-0.15Sr alloy is higher than that of ZA35 alloy at the same temperature; Compared to ZA35 alloy,ZA35-0.15Sr alloy with refined grain and dendrite improve the corrosion resistance in NaOH solution.