缓蚀剂对金属钆在水介质中腐蚀行为的影响  

Effect of Inhibitors on Corrosion of Gadolinium in Water

作　　者：张泽玉[1] 龙毅[1] 叶荣昌[1] 常永勤[1] 万发荣[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《中国稀土学报》2005年第4期400-404,共5页Journal of the Chinese Society of Rare Earths

基　　金：国家"863计划"(2002AA324010)资助项目

摘　　要：采用失重法、腐蚀电化学方法研究了NaOH、NH4OH、单宁酸和苯并三氮唑等缓蚀剂对金属钆在水介质中腐蚀行为的影响。在没有缓蚀剂的情况下,钆在水中发生明显的点蚀,腐蚀速度为0.152g.m-2.h-1。NaOH能有效地控制金属钆在水介质中的腐蚀,经8880h的长时间浸泡,钆表面依然呈现明显的金属光泽,没有失重与点蚀发生。当采用NaOH调节苯并三氮唑(BTA)溶液的pH值接近中性时,钆在其中长时间浸泡,同样没有失重发生,表观没有发现点蚀发生。选择合适的缓蚀剂,使得钆能够在水介质中不发生腐蚀,保证了磁制冷机的长时间正常运转。The effects of some inhibitors such as NaOH, NH_4OH, Tannic acid and benzotriazole (BTA) on corrosion of Gd in water were investigated by weight loss, potentiodynamic polarization curve. The results show that NaOH solution is the best one to inhibit the corrosion of Gd in water. After 8880 h immersions in NaOH solution with pH=10, the surface of the Gd sample is still silver white. And there are no pitting and weight loss in this process. The same result is in BTA+NaOH solution with pH=7. After long time im...

关 键 词：钆 磁制冷 缓蚀剂 失重法 极化曲线 稀土 

分 类 号：TG174.3[金属学及工艺—金属表面处理]