以X80管线钢为研究对象, 以模拟江西樟树土壤溶液为试验环境, 研究了外加电位、应变速率以及这二者的交互作用对X80管线钢应力腐蚀敏感性的影响。结果表明: 在中等应变速率和阴极电位下试验钢对应力腐蚀开裂(SCC)非常敏感; 在阳极电位条件下, 应变速率所引起的物质交换对SCC过程影响不大, SCC敏感性较低; 在阴极电位区, 试验钢上发生析氢反应, 在中等应变速率下, 本体溶液与裂纹内部溶液及裂纹内部溶液与裂纹尖端金属原子的交换充足, 试验钢发生氢致开裂的倾向增加, SCC敏感性更高。

Taking X80 pipeline steel as research object and simulated solution of Jiangxi Zhangshu area soil as test environment, the effects of applied potential, strain rate and the interaction of above factors on stress corrosion susceptibility of X80 pipeline steel were studied. The results show that the tested steel was very sensitive to stress corrosion cracking (SCC) at medium strain rates and cathodic potentials. Under anodic potential condition, the material interchange induced by strain rate had small effect on SCC process and the SCC susceptibility was relatively low. In cathodic potential area, hydrogen evolution reaction happened on the tested steel , the interchange between bulk solution and the solution inside crack and the interchange between the solution inside crack and the metal atoms in crack-tip were sufficient at medium strain rates, and the trend of the tested steel suffering hydrogen induced cracking increased and the SCC susceptibility was higher.