论文部分内容阅读
采用电化学技术、表面分析技术和失重法,研究了X100管线钢在有/无SRB的近中性土壤溶液中的腐蚀过程与行为。结果表明,X100管线钢在有/无SRB的近中性土壤溶液中的腐蚀均属于中度腐蚀,SRB的活动与代谢影响了X100钢的腐蚀行为,随着腐蚀时间的增加,SRB可在X100钢表面形成由微生物膜与腐蚀产物结合在一起的更加致密的结合膜,对腐蚀传质有一定的阻碍作用,进而减缓了X100钢的腐蚀;而无菌时X100钢表面的腐蚀产物比较疏松,厚度不均匀,对钢基体的保护作用差,导致X100钢在无菌溶液中的腐蚀速率大于有菌时,说明SRB具有减缓X100管线钢腐蚀的作用。不含SRB时X100钢的腐蚀产物主要为铁的氧化物(α-FeO(OH)和Fe_3O_4),含SRB时腐蚀产物主要为铁的氧化物和铁的硫化物(Fe_3O4和FeS)。
Using electrochemical technique, surface analysis technique and weight loss method, the corrosion process and behavior of X100 pipeline steel in near-neutral soil solution with / without SRB were studied. The results showed that the corrosion of X100 pipeline steel in neutral and neutral soil solution with / without SRB was moderate corrosion. The activity and metabolism of SRB affected the corrosion behavior of X100 steel. With the increase of corrosion time, SRB could be found in X100 The formation of the surface of the steel by the microbial membrane and corrosion products more closely together with the membrane, the corrosion of mass transfer has a certain impediment, thereby reducing the corrosion of X100 steel; and X100 steel sterile surface when the corrosion products more loose, Uneven thickness, the protective effect of the steel matrix is poor, resulting in X100 steel corrosion rate in sterile solution is greater than bacteria, indicating that SRB has the effect of reducing X100 pipeline steel corrosion. The corrosion products of X100 steel without SRB are mainly iron oxides (α-FeO (OH) and Fe_3O_4). The corrosion products of SRB with XRD are mainly iron oxides and iron sulfides (Fe_3O_4 and FeS).