TZM合金在酸、碱腐蚀介质中的腐蚀行为研究  

Corrosion Behavior in Acid and Alkaline Medium of TZM Alloy

作　　者：胡平[1] 于志涛[1] 王快社[1] 杨帆[1] 胡卜亮[1] 宋瑞[1] 谭江飞 曹维成[2] 安耿[2] 郭磊 

机构地区：[1]西安建筑科技大学,陕西西安710055 [2]金堆城钼业股份有限公司,陕西西安710068 [3]西安瑞福莱钨铝有限公司,陕西西安721914

出　　处：《稀有金属材料与工程》2017年第12期3961-3966,共6页Rare Metal Materials and Engineering

基　　金：西部材料科技创新基金项目(XBCL-3-21);西安市科技计划-高校院所技术转移推进项目(CXY1521(3));西安建筑科技大学科技基金(QN1505)

摘　　要：对TZM、掺杂La-TZM合金进行酸性和碱性介质腐蚀试验,设计腐蚀周期分别为10、30、50、70 d 4个阶段。通过对2种TZM和掺杂La-TZM合金在2种腐蚀介质中不同腐蚀周期的质量损失、失重速度、平均腐蚀率以及腐蚀形貌的研究与比较,分析TZM合金在2种介质中的腐蚀机理,以及掺杂La对于TZM合金的耐酸、碱腐蚀性能的影响。研究表明TZM合金在酸性介质中主要发生电池反应,阳极金属溶解,阴极析氢;腐蚀在金属表面缺陷、杂质富集、晶界处以及位错处优先进行,并且表面存在划痕处的小于0.00254 mm的窄缝处发生缝隙腐蚀。TZM合金在碱性介质中几乎不发生腐蚀;掺杂稀土元素镧可以略微提升TZM合金的耐蚀性,但提升效果不显著。The corrosion behaviors of TZM and La doped TZM alloy in acid and alkaline medium were investigated.Four corrosion period stages as 10,30,50,70 d were designed,and the mass loss condition,weight loss condition,average corrosion rate and corrosion morphology were investigated and compared.The corrosion mechanism in acid and alkaline of TZM alloy and the effect of La doping on corrosion resistance of TZM alloy were analyzed.The results show that TZM alloy corroded in acid sets off cell reaction and anode dissolves with cathode hydrogen evolution.Corrosion prior occurs at the surface defect,impurity,grain boundary and dislocation.Crevice corrosion morphology is observed at the narrow slit which is formed by scratch and width less than 0.00254 mm.Corrosion hardly occurs in alkaline medium.La doping could slightly promote the corrosion resistance of TZM alloy,but the improvement is not significant.

关 键 词：腐蚀 酸性腐蚀介质 碱性腐蚀介质 阳极溶解 

分 类 号：TG172[金属学及工艺—金属表面处理]