X70管线钢在硫酸盐还原菌作用下的应力腐蚀开裂行为

发布时间：2018-05-26 21:52

本文选题：X管线钢 + 应变速率　；参考：《表面技术》2017年10期

【摘要】：目的油气管输中X70钢的应力腐蚀开裂问题日趋严重,而且土壤环境中微生物腐蚀现象备受关注,因此拟通过实验室模拟土壤环境下X70管线钢的腐蚀,获得高强度管线钢在硫酸盐还原菌作用下的应力腐蚀开裂规律。方法采用自制的应力电化学测试装置,通过慢应变速率拉伸试验(SSRT)对材料的应力腐蚀敏感性进行分析,利用交流阻抗以及扫描电镜(SEM)对断口形貌以及生物膜的成分进行研究。结果当应变速率为5×10~(-7)s~(-1)时,无菌模拟溶液中试样的应力腐蚀敏感性远大于含SRB模拟溶液中试样的应力腐蚀敏感性,SRB的存在对X70管线钢应力腐蚀起到很大程度的促进作用。当应变速率为1×10~(-6)s~(-1)时,SRB对于X70管线钢应力腐蚀敏感性的影响较小,断裂主要由力学因素主导,SRB起辅助作用。结论 X70管线钢在沈阳土壤模拟溶液中具有一定的应力腐蚀敏感性。SRB对于X70管线钢在沈阳土壤模拟溶液中的应力腐蚀起到一定程度的促进作用。
[Abstract]:Objective the stress corrosion cracking of X70 steel in oil and gas pipeline transportation is becoming more and more serious, and the phenomenon of microbial corrosion in soil environment is concerned. Therefore, the stress corrosion cracking law of high strength pipeline steel under the action of sulfate reducing bacteria is obtained by simulating the corrosion of X70 pipeline steel in the laboratory soil environment. The stress corrosion sensitivity of the material was analyzed by the slow strain rate tensile test (SSRT). The fracture morphology and the composition of the biomembrane were studied by the AC impedance and scanning electron microscope (SEM). The stress corrosion sensitivity of the specimen in the aseptic simulated solution was far away when the strain rate was 5 x 10~ (-7) s~ (-1). It is greater than the stress corrosion sensitivity of the sample containing SRB, and the existence of SRB promotes the stress corrosion of X70 pipeline steel to a great extent. When the strain rate is 1 x 10~ (-6) s~ (-1), SRB has less influence on the stress corrosion sensitivity of the X70 pipeline steel. The fracture is mainly dominated by mechanical factors and SRB plays a auxiliary role. Conclusion X70 pipeline steel is concluded. A certain stress corrosion sensitivity.SRB in Shenyang soil simulated solution promotes the stress corrosion of X70 pipeline steel in the soil simulated solution in Shenyang.
【作者单位】：辽宁石油化工大学石油天然气工程学院油气储运技术重点实验室;
【基金】：国家自然科学基金资助项目(51604150)~~
【分类号】：TE988.2;TG172

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