Zn-Al-Sr-Cu合金在NaOH溶液中的腐蚀行为  

Corrosion Behavior of Zn-Al-Cu-Sr Alloy in NaOH Solution

作　　者：刘敬福[1,2] 陈鹏飞[2] 宋建[2] 

机构地区：[1]辽宁工程技术大学材料科学与工程学院,阜新123000 [2]沈阳工业大学材料科学与工程学院,沈阳110870

出　　处：《表面技术》2012年第3期40-42,66,共4页Surface Technology

基　　金：辽宁省创新团队项目(2008T137);沈阳市科研项目(F10-205-1-49)

摘　　要：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 so lution 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 the temperature is elevated, the open cir cult 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.

关 键 词：ZA35-0.15Sr合金 NAOH溶液 温度 极化曲线 

分 类 号：TG172.5[金属学及工艺—金属表面处理]