采用慢应变速率拉神(SSRT)实验和SEM研究了SRB对X100管线钢在典型的西北盐渍土壤(库尔勒土壤模拟溶液)中应力腐蚀开裂行为的影响.结果表明,X100管线钢母材和焊缝在无菌的库尔勒土壤模拟溶液中具有较高的SCC敏感性,其断口模式为穿晶+沿晶SCC混合断裂;X100管线钢母材和焊缝在含有SRB的库尔勒土壤模拟溶液中的SCC敏感性低于无菌时的,其断口模式为穿晶SCC断裂,说明SRB的存在抑制了X100管线钢的脆变,致使X100管线钢的SCC敏感性降低,这可能是由于SRB能在X100管线钢表面快速繁殖并形成生物膜,该生物膜随时间的增加会不断的堆积并变得致密,一定程度上阻隔了活性阴离子Cl-进入X100管线钢基体表面,致使X100管线钢的SCC敏感性减小.
The effect of sulfate reducing bacteria (SRB) on stress corrosion cracking (SCC) behavior of X100 pipeline steel in saline soil of the Korla area in Northwest China was investigated using slow strain rate tensile (SSRT) tests and scanning electron microscopy (SEM).The results show that the X100 pipeline steel exhibits high SCC susceptibility in sterile simulated Korla soil solution and the failure mode is transgranular and intergranular mixed cracking.The X100 pipeline steel has lower SCC susceptibility in the simulated SRB Korla soil solution and the failure mode is transgranular cracking.These results suggest that the SRB in the solution suppress the embrittlement and reduce the SCC susceptibility of the X100 pipeline steel,it may be due to the SRB can multiply rapidly and form a compact biofilm on the X100 pipeline steel surface,and then partly blocks the active anion Cl-into X100 pipeline steel substrate surface.
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