利用动电位极化技术、慢应变速率拉伸试验(SSRT)以及扫描电镜(SEM)等方法研究了大港土壤环境中硫酸盐还原菌(SRB)对X80钢应力腐蚀开裂行为的影响及作用机理.结果表明:与无菌条件下相比,大港土壤模拟溶液中SRB的存在促进了X80管线钢的阳极溶解过程,诱发了金属的点蚀行为,增大了应力腐蚀开裂的机率.大港溶液中SRB数量越多,试样的点蚀电位越低,X80钢的应力腐蚀敏感性越大.当SRB生长4d时,其菌量最大,此时试样断口形貌仍表现为韧性断裂特征;在SRB不同生长阶段下大港土壤模拟溶液中X80管线钢的应力腐蚀开裂机理为阳极溶解机制.
Effects of sulfate reducing bacteria (SRB) on stress corrosion cracking (SCC) behavior and mechanism of X80 steel in Dagang soil environment were investigated by means of potentiodynamic polarization technology,slow strain rate test (SSRT) and scanning electron microscopy (SEM).The results show that comparing without SRB,the presence of SRB promotes the anodic dissolution process of the X80 steel,inducing the pitting corrosion and increasing the chance of stress corrosion cracking.The more SRB quantity is,the lower potential of pitting corrosion is,the greater stress corrosion sensitivity of the X80 steel is.When SRB grows for 4 days,the quantity is the most,and the fracture surface of the steel is ductile fracture characteristics.Stress corrosion cracking mechanism of the X80 steel is anodic dissolution mechanism at different SRB growth stages in Dagang soil.
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