X80管線鋼表面SRB生物膜特征及腐蝕行為

X80管線鋼表面SRB生物膜特征及腐蝕行為Characteristics of SRB Biofilm and Microbial Corrosion of X80 Pipeline Steel

采用SEM、Raman光譜、XPS等分析手段，結(jié)合掃描振動電極(SVET)、微區(qū)電化學測試和電化學阻抗譜(EIS)等電化學測量技術(shù)，研究含硫酸鹽還原菌(SRB)的模擬海水中X80管線鋼表面生物膜的形成、特征，生物膜與膜下金屬的交互作用，以及管線鋼腐蝕行為及電化學過程特征。結(jié)果表明：SRB微菌落及胞外聚合物(EPS)形成初期，EPS的屏障作用抑制X80鋼的腐蝕過程；SRB生物膜形成后，X80鋼的自然腐蝕電位降低約20 mV，SRB顯著促進了管線鋼的腐蝕過程；浸泡后期SRB及其生物膜使X80鋼腐蝕速率較滅菌對照組高出約1個數(shù)量級。SRB生物膜與腐蝕產(chǎn)物Fe2+/Fe3+間存在絡合、螯合作用，細胞及其代謝產(chǎn)物硫化物與金屬間存在直接或間接電子交互作用，這些作用相互協(xié)同耦合，促使生物膜下局部腐蝕的發(fā)生和發(fā)展。

Microbiologically induced corrosion (MIC) is known as one of the most damaging failures for pipeline steels. Especially, sulfate-reducing bacteria (SRB) is the most widespread strains in soil and seawater environments and is the typical bacteria associated with MIC. SRB may cause severe localized attack, leading to pipeline failures in forms of pitting, crevice corrosion, dealloying and cracking. In this work, SEM, Raman spectroscopy, XPS, scanning vibrating electrode (SVET) technique, EIS and other electrochemical techniques were used to study the formation of SRB biofilm, its electrochemical interaction with X80 pipeline steel and corrosion behavior of the steel in a simulated seawater. The results showed that barrier effect of the extracellular polymer substances (EPS) inhibits corrosion process of X80 steel in the initial formation of EPS and SRB micro-colony. After the formation of SRB biofilm, open circuit potential (EOCP) of the steel decreases 20 mV, and SRB significantly promotes the corrosion process of the pipeline steel. In the later stage, due to SRB and its biofiom, the corrosion rate of X80 steel exposed in SRB inoculated environment is almost one order of magnitude higher than that in the sterile environment. The biofilm have complexation effect and chelation effect with corrosion products (Fe2+/Fe3+). SRB cells, metabolites and biofilms have direct and indirect electron interactions with the steel substrate. These various coupling effects promote occurrence and development of local corrosion on the surface of the steel beneath biofilm.

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