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采用电化学极化曲线测试、EIS测试、裂纹扩展实验和SEM分析研究了X80管线钢在鹰潭土壤溶液环境下的应力腐蚀开裂(SCC)裂纹扩展行为及机理.结果表明,X80管线钢在酸性土壤环境中的裂纹扩展速率随着外加电位的降低呈现增加趋势,相较于开路电位下的裂纹扩展,在裂纹扩展初期,-850 m V下裂纹扩展速率较大,而在裂纹快速扩展阶段,过保护电位-1200 m V下裂纹扩展速率更大;同时X80管线钢在酸性土壤环境中的SCC裂纹扩展机制也随着施加外加电位的不同而改变,在外加电位高于-930 m V时为阳极溶解与氢脆的混合机制,负于-930 m V时则为氢脆机制.
Electrochemical polarization curve test, EIS test, crack growth test and SEM analysis were conducted to study the SCC crack growth behavior and mechanism of X80 pipeline steel in Yingtan soil solution environment. The results show that X80 pipeline steel has better corrosion resistance in acid soil The crack propagation rate increases with the decrease of applied potential in the environment. Compared with the crack growth at open circuit potential, the crack propagation rate at -850 mV is large at the initial stage of crack growth. However, in the rapid crack propagation stage, The crack growth rate is greater at the protective potential of -1200 mV; at the same time, the mechanism of SCC crack propagating in acidic soil environment changes with the applied potential, and is the anode when the applied potential is higher than -930 mV The mechanism of dissolution and hydrogen embrittlement is a hydrogen embrittlement mechanism when negative to -930 mV.