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采用电化学动电位极化技术、慢应变速率拉伸(SSRT)实验和SEM对X80管线钢在鹰潭土壤模拟溶液中的应力腐蚀行为进行了研究.结果表明:X80管线钢在酸性土壤环境中具有较高的SCC敏感性,其断口模式为穿晶SCC;SCC机制随外加电位的不同而改变,在外加电位高于-930 mV时,其SCC机制由阳极溶解和氢致腐蚀两种电极过程控制,呈现阳极溶解和氢脆复合机制;当电位低于该电位时,其SCC为氢脆机制.随着外加阴极电位的降低,X80管线钢的SCC敏感性不断增大;与X70钢相比,氢脆作用在X80管线钢SCC过程中发挥了更重要的作用.
The stress corrosion behavior of X80 pipeline steel in Yingtan soil simulation solution was studied by electrochemical potentiodynamic polarization, slow strain rate tensile test (SSRT) and SEM.The results showed that X80 pipeline steel had the following properties in acidic soil: The SCC mechanism changes with the applied potential. When the applied potential is higher than -930 mV, the SCC mechanism is controlled by the processes of anodic dissolution and hydrogen induced corrosion , Showing anodic dissolution and hydrogen embrittlement mechanism.When the potential is lower than this potential, the SCC is hydrogen embrittlement mechanism.With the decrease of external cathodic potential, the SCC sensitivity of X80 pipeline steel increases continuously.Compared with X70 steel, Hydrogen embrittlement plays an even more important role in the SCC process of X80 pipeline steel.