电极电位和温度对X70钢在高pH值模拟土壤环境中应力腐蚀破裂的影响  

EFFECT OF ELECTRODE POTENTIAL AND TEMPERATURE ON STRESS CORROSION CRACKING OF PIPELINE STEEL X70 IN HIGH pH SOLUTIONS

作　　者：张国良[1] 李光福[1] 周建江[1] 黄春波[1] 杨武[1] 

机构地区：[1]上海材料研究所,上海200437

出　　处：《腐蚀与防护》2007年第9期437-441,共5页Corrosion & Protection

基　　金：上海市科学技术委员会项目资助(05dz22316);国家重点基础研究专项经费资助(G19990650)

摘　　要：采用慢应变速率拉伸试验(SSRT)方法研究了温度(30~65℃范围)和电极电位(-1500^-200 mV(SCE)范围)对X70管线钢在0.5 mol/L Na2CO3+1 mol/L NaHCO3的高pH模拟土壤溶液中应力腐蚀破裂(SCC)行为的影响。结果表明:在阳极极化区,温度对该钢的SCC敏感性影响不大,在阴极极化区,SCC敏感性随温度升高而下降;在所研究的电位区间,SCC敏感性随着电极电位的降低而增大;SCC机理分析表明,当电位E>EH(溶液中H+/H2的平衡电位)时,应该是阳极溶解占主导,而当E≤EH时,氢致破裂占主导。The behaviors of high pH stress corrosion cracking(SCC)of pipeline steel X70 in 0.5mol/L Na2CO3+1 mol/L NaHCO3 solution were studied by means of slow strain rate tests(SSRT) at different temperatures in the range from 30 ℃ to 65 ℃ and different electrode potentials from-1500 to-200 mV(SCE).The temperature had no apparent effect on SCC susceptibility of the steel in anodic polarization range,but the SCC susceptibility increased with the rise of temperature in cathodic polarization range.The SCC susceptibilit...

关 键 词：管线钢 高pH应力腐蚀破裂 电极电位 温度 

分 类 号：TG172.9[金属学及工艺—金属表面处理]