【摘要】：采用失重法、開路電位、電化學(xué)阻抗譜(EIS)、極化曲線等方法,通過在海洋環(huán)境中浸泡不同時(shí)間對(duì)比分析有無硫酸鹽還原菌(SRB)條件下Q235鋼的腐蝕電化學(xué)特征,研究SRB對(duì)Q235鋼的腐蝕行為的影響。結(jié)果表明,在含SRB的海水中,隨著浸泡時(shí)間延長(zhǎng),Q235鋼的腐蝕電流密度先從7.49mA·cm~(-2)增加至9.77mA·cm~(-2),然后逐漸減小至5.01mA·cm~(-2),最終增加至12.6mA·cm~(-2),且始終小于相同時(shí)間下無SRB海水中的腐蝕電流密度,表明SRB的存在抑制了Q235的腐蝕。在含SRB的海水中,Q235鋼的腐蝕行為主要由Cl~-和生物膜共同影響。在SRB穩(wěn)定生長(zhǎng)階段,腐蝕以生物膜抑制為主;在SRB指數(shù)生長(zhǎng)階段和衰亡階段,生物膜抑制作用較弱,以Cl~-促進(jìn)金屬腐蝕為主。
[Abstract]:By means of weightlessness method, open circuit potential and electrochemical impedance spectroscopy (EIS),) polarization curve, the corrosion electrochemical characteristics of Q235 steel were analyzed by immersion in marine environment for different time. The corrosion characteristics of Q235 steel were analyzed with or without sulphate reducing bacteria (SRB). The effect of SRB on corrosion behavior of Q235 steel was studied. The results show that the corrosion current density of Q235 steel increases from 7.49mA cm~ (-2) to 9.77mA cm~ (-2) and then decreases to 5.01mA cm~ (-2) with the prolongation of immersion time in seawater containing SRB. Finally, the corrosion current density of Q235 was increased to 12.6mA cm~ (-2), and was always less than the corrosion current density in seawater without SRB at the same time, indicating that the existence of SRB inhibited the corrosion of Q235. In seawater containing SRB, the corrosion behavior of Q235 steel is mainly affected by Cl~- and biofilm. In the stable growth stage of SRB, the corrosion was mainly inhibited by biofilm, but the inhibition of biofilm was weak in the growth stage and decaying stage of SRB exponent, and that of metal corrosion was mainly promoted by Cl~-.
【作者單位】： 遼寧石油化工大學(xué)石油天然氣工程學(xué)院;中石油遼寧撫順銷售分公司;
【基金】：國(guó)家自然科學(xué)基金(51574147;51604150) 遼寧省博士啟動(dòng)資金(201601324) 遼寧石油化工大學(xué)引進(jìn)人才科研啟動(dòng)基金(2016XJJ-032)
【分類號(hào)】：TG178

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