Ni_(47)Ti_(44)Nb_9形状记忆合金耐蚀性能和抗氧化性能研究  

Corrosion and High Temperature Oxidation Resistance of Ni_(47)Ti_(44)Nb_9 Shape Memory Alloy

作　　者：王二敏[1] 倪志铭[1] 洪起虎[1] 杨根林[1] 韩劲[1] 

机构地区：[1]北京航空材料研究院,北京100095

出　　处：《航空材料学报》2012年第4期53-56,共4页Journal of Aeronautical Materials

基　　金：预研先进制造技术(51318040105)

摘　　要：采用高温氧化、电化学腐蚀测试,并结合SEM,XRD等分析手段,研究了Ni47Ti44Nb9合金的氧化性能和抗腐蚀性能。结果表明,Ni47Ti44Nb9合金在450℃下氧化非常轻微,600～800℃下合金的氧化增重曲线近似符合抛物线规律。经高温氧化后,合金表面形成的氧化层具有分层结构,氧化截面由外氧化层和过渡层组成。电化学腐蚀结果表明,溶液中NaCl含量越低,溶液温度越低,合金的腐蚀电流密度越小,腐蚀电位正移,保护膜的稳定性提高。The oxidation resistance and corrosion resistance of the Ni44Ti47Nb9 shape memory alloy were studied. The result shows that Ni47Ti44Nb9 alloy exhibits good oxidation resistance at 450℃. Further more, the oxidation curve of Ni47Ti44Nh9 alloy follows the para- bolie law in the temperature range of 600 -800℃. Experimental results indicate that a multi-layer scale, which is composed of outer layer and transition layer, is formed on the surface of N i47Tin Nb9 alloy after high temperature oxidation. The results of electrochemical corrosion test show that the corrosion resistance of Ni47Ti44 Nb9 alloy increases and the corrosion potential shifts positively as the temper- ature and the NaCI content of NaCI solutions decreases.

关 键 词：NiTiNb 形状记忆合金 腐蚀 高温氧化 电化学阻抗谱(EIS) 

分 类 号：TG142[一般工业技术—材料科学与工程]