海洋硫酸盐还原菌对Q235钢腐蚀行为的影响
发布时间：2018-11-05 10:46
【摘要】：采用失重法、开路电位、电化学阻抗谱(EIS)、极化曲线等方法,通过在海洋环境中浸泡不同时间对比分析有无硫酸盐还原菌(SRB)条件下Q235钢的腐蚀电化学特征,研究SRB对Q235钢的腐蚀行为的影响。结果表明,在含SRB的海水中,随着浸泡时间延长,Q235钢的腐蚀电流密度先从7.49mA·cm~(-2)增加至9.77mA·cm~(-2),然后逐渐减小至5.01mA·cm~(-2),最终增加至12.6mA·cm~(-2),且始终小于相同时间下无SRB海水中的腐蚀电流密度,表明SRB的存在抑制了Q235的腐蚀。在含SRB的海水中,Q235钢的腐蚀行为主要由Cl~-和生物膜共同影响。在SRB稳定生长阶段,腐蚀以生物膜抑制为主;在SRB指数生长阶段和衰亡阶段,生物膜抑制作用较弱,以Cl~-促进金属腐蚀为主。
[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~-.
【作者单位】： 辽宁石油化工大学石油天然气工程学院;中石油辽宁抚顺销售分公司;
【基金】：国家自然科学基金(51574147;51604150) 辽宁省博士启动资金(201601324) 辽宁石油化工大学引进人才科研启动基金(2016XJJ-032)
【分类号】：TG178
[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~-.
【作者单位】： 辽宁石油化工大学石油天然气工程学院;中石油辽宁抚顺销售分公司;
【基金】：国家自然科学基金(51574147;51604150) 辽宁省博士启动资金(201601324) 辽宁石油化工大学引进人才科研启动基金(2016XJJ-032)
【分类号】：TG178
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