W-Ni-Cu和W-Ni-Fe合金的腐蚀性能（英文）  

Corrosion Performance of W-Ni-Cu and W-Ni-Fe Alloys

作　　者：李鹭 Liu Zhu 刘玉项 Li Lu;Liu Zhu;Liu Yuxiang(University of Manchester, Manchester MB 9PL, U)

机构地区：[1]曼彻斯特大学,英国曼彻斯特M139PL

出　　处：《稀有金属材料与工程》2018年第6期1708-1715,共8页Rare Metal Materials and Engineering

摘　　要：高比重钨合金是一种具有高密度,高强度和良好的耐腐蚀性等特性的复合材料。采用沉浸试验和电化学试验对2种钨合金(90%W-6%Ni-4%Cu和95%W-3.5%Ni-1.5%Fe)的腐蚀性能进行了研究。结果表明,当W-Ni-Cu合金发生电偶腐蚀时,W相首先遭到腐蚀;而在W-Ni-Fe合金中,粘结相会先发生腐蚀。动电位极化测量结果表明,pH值对高比重钨合金腐蚀速率有显著影响,与酸性环境相比较,合金在中性溶液中腐蚀速率较低。根据SEM和EDX的结果分析了合金成分的溶解以及腐蚀产物的生成等腐蚀机理。Tungsten heavy alloys（WHAs） possess a special combination of properties, such as high density, high mechanical strength and good corrosion resistance. The corrosion performance of two WHAs, 90%W-6%Ni-4%Cu and 95%W-3.5%Ni-1.5%Fe has been investigate by immersion test and electrochemical test. The AFM results indicate the attack would be on the W phase in W-Ni-Cu alloy when it generates galvanic corrosion, while W-Ni-Fe alloy reveals an opposite result. Potentiodynamic polarization measurement shows pH value is an important factor in corrosion rate. The two types of alloys show relatively lower corrosion rates in DI water, as compared to 0.6 mol/L HCl solution. The corrosion mechanism involved in the release of the metallic components and generation of corrosion products was analyzed by SEM and EDX.

关 键 词：高比重钨合金 腐蚀 表面电势测量 电动位极化测量法 

分 类 号：TG172[金属学及工艺—金属表面处理]