海洋硫酸盐还原菌对X100钢腐蚀行为的影响
发布时间：2018-12-27 11:09
【摘要】：通过测定海水溶液中硫酸盐还原菌(SRB)生长曲线、溶液状态参数、自腐蚀电位、电化学阻抗谱和极化曲线的变化规律,研究了SRB的存在对X100钢在该体系中的腐蚀行为的影响。结果表明:SRB在海水培养基中的一个生长周期可分为快速生长阶段、稳定阶段和衰亡阶段。溶液S2-浓度和氧化还原电位与SRB数目密切相关,X100钢的自腐蚀电位随时间增加呈现先负移、然后正移、最后负移的变化规律;EIS结果表明,在接菌海水中,X100钢的腐蚀速率随着浸泡时间的增加呈现先增大、后减小、再增大的变化趋势;与灭菌海水中的腐蚀相比,X100钢在接菌海水中的腐蚀电流密度降低,腐蚀减弱,其原因是SRB生物膜的存在阻碍了海水与试样表面的直接接触,从而抑制了金属的腐蚀。
[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.
【作者单位】： 辽宁石油化工大学石油天然气工程学院;
【基金】：国家自然科学基金资助项目(51574147,51604150) 辽宁省教育厅重点实验室基础研究资助项目(LZ2014027)
【分类号】：TG178
[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.
【作者单位】： 辽宁石油化工大学石油天然气工程学院;
【基金】：国家自然科学基金资助项目(51574147,51604150) 辽宁省教育厅重点实验室基础研究资助项目(LZ2014027)
【分类号】：TG178
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