电位极化方式对奥氏体不锈钢应力腐蚀开裂敏感性的影响  

EFFECT OF POTENTIAL POLARIZATION ON THE STRESS CORROSION CRACKING OF AUSTENITIC STAINLESS STEEL

作　　者：牛林[1,2] 张震宇[1,2] 林海潮 曹楚南[1,2] 

机构地区：[1]山东大学化学院 [2]中国科学院金属腐蚀与防护研究所金属腐蚀与防护国家重点实验室

出　　处：《山东大学学报（自然科学版）》1998年第4期427-431,共5页Journal of Shandong University(Natural Science Edition)

基　　金：国家自然科学基金;金属腐蚀与防护国家重点实验室资助

摘　　要：在慢应变速率拉伸过程中通过施加循环电位扫描及电位阶跃等不同的电位极化方式，研究了奥氏体不锈钢在酸性氯化物溶液中的应力腐蚀开裂敏感性，并利用ＳＥＭ技术观察了断口形貌．结果表明，电位扫描速度和电位阶跃频率对裂纹萌生扩展起决定作用．相同电位范围内，电位阶跃比电位扫描导致更高的材料断裂敏感性．The stress corrosion cracking susceptibility of 1Cr18Ni9Ti austenitic stainless steel in 0.75 mol·L -1 HCl+0.25 mol·L -1 NaCl solution has been studied by slow strain rate tests(SSRT).During the slow rate tensile process,the specimen was polarized with different potential polarization modes such as cyclic potential scan and cyclic potential step methods.The results indicated that potential scan rate and/or step frequency played an essential role in the initiation and propagation of crack.Potential step led to much higher cracking susceptibility than potential scan within the same potential ranges.

关 键 词：奥氏体不锈钢 应力腐蚀开裂 电位极化 敏感性 

分 类 号：TG142.71[一般工业技术—材料科学与工程] TG142.25[金属学及工艺—金属材料]