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采用慢应变速率拉神(SSRT)实验和SEM研究了SRB对X100管线钢在典型的酸性土壤(鹰潭土壤模拟溶液)中应力腐蚀开裂行为的影响。结果表明,X100钢母材和焊缝在无菌的鹰潭土壤模拟溶液中的SCC敏感性高于有菌时的,X100钢母材和焊缝在无菌和有菌酸性土壤中的断裂模式均为穿晶SCC断裂,说明SRB的存在抑制了X100钢的脆变,导致X100钢的SCC敏感性降低,这可能是由于SRB能在X100钢表面快速生长繁殖并形成生物膜,该生物膜随时间的增加会不断的堆积并变得致密,一定程度上阻隔了腐蚀性Cl~-进入钢基体表面,致使X100钢的SCC敏感性减小。
The effects of SRB on the stress corrosion cracking behavior of X100 pipeline steel in a typical acidic soils (Yingtan soil simulation solution) were investigated using slow strain rate pull-out (SSRT) experiments and SEM. The results show that the SCC sensitivity of X100 steel base metal and weld in sterile Yingtan soil simulation solution is higher than that of bacteria, and both fracture patterns of X100 steel base metal and weld in sterile and acid bacteria The results showed that the presence of SRB inhibited the brittleness of X100 steel and decreased the SCC sensitivity of X100 steel. This may be due to the rapid growth and reproduction of SRC on the surface of X100 steel and the formation of a biofilm. Will continue to accumulate and become dense, to a certain extent, blocking the corrosive Cl ~ - into the steel substrate surface, resulting in reduced SCC X100 steel sensitivity.