【摘要】：通過測定海水溶液中硫酸鹽還原菌(SRB)生長曲線、溶液狀態(tài)參數(shù)、自腐蝕電位、電化學(xué)阻抗譜和極化曲線的變化規(guī)律,研究了SRB的存在對X100鋼在該體系中的腐蝕行為的影響。結(jié)果表明:SRB在海水培養(yǎng)基中的一個生長周期可分為快速生長階段、穩(wěn)定階段和衰亡階段。溶液S2-濃度和氧化還原電位與SRB數(shù)目密切相關(guān),X100鋼的自腐蝕電位隨時間增加呈現(xiàn)先負移、然后正移、最后負移的變化規(guī)律;EIS結(jié)果表明,在接菌海水中,X100鋼的腐蝕速率隨著浸泡時間的增加呈現(xiàn)先增大、后減小、再增大的變化趨勢;與滅菌海水中的腐蝕相比,X100鋼在接菌海水中的腐蝕電流密度降低,腐蝕減弱,其原因是SRB生物膜的存在阻礙了海水與試樣表面的直接接觸,從而抑制了金屬的腐蝕。
[Abstract]:The influence of the presence of SRB on the corrosion behavior of X100 steel in this system was studied by measuring the growth curve of sulfate reducing bacteria (SRB), solution state parameters, corrosion potential, electrochemical impedance spectrum and polarization curve. The results showed that a growth cycle of SRB in seawater medium could be divided into three stages: rapid growth stage, stable stage and decaying stage. The concentration of S2- and the redox potential are closely related to the number of SRB. The self-corrosion potential of X100 steel shows a negative shift first, then a positive shift, and then a negative shift with the increase of time. The EIS results showed that the corrosion rate of X100 steel increased first, then decreased and then increased with the increase of soaking time in the inoculated seawater. Compared with the corrosion in sterilized seawater, the corrosion current density of X100 steel in the inoculated seawater was decreased and the corrosion was weakened. The reason was that the presence of SRB biofilm hindered the direct contact between seawater and the surface of the sample, thus inhibiting the corrosion of metals.
【作者單位】： 遼寧石油化工大學(xué)石油天然氣工程學(xué)院;
【基金】：國家自然科學(xué)基金資助項目(51574147,51604150) 遼寧省教育廳重點實驗室基礎(chǔ)研究資助項目(LZ2014027)
【分類號】：TG178

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