硫酸盐还原菌的生长过程及其对D36钢海水腐蚀行为的影响

Effects of Growing Sulfate-reducing Bacteria on Corrosion Behaviour of D36 Steel in Seawater

通过测定海水中硫酸盐还原菌(SRB)的生长曲线及其不同生长阶段的硫离子浓度、D36钢电极体系的氧化还原电位、自腐蚀电位、极化曲线和电化学阻抗谱,研究了硫酸盐还原菌对该体系钢电极腐蚀行为的影响。结果表明,海水中D36钢氧化还原电位和自腐蚀电位主要由体系中硫酸盐还原菌代谢产物硫离子的浓度所决定;体系的阳极和阴极反应速率均在硫酸盐还原菌增殖期增加,而且阳极反应速率衰亡期和残余期保持不变。

Influences of growing process of sulfate-reducing bacteria （SRB） in seawater system on the corrosion behaviour of D36 steel were studied by detection of sulfide concentration, redox potential, corrosion potential, polarization curves and electrochemical impedance spectroscopy analysis. The results indicate that the redox potential and corrosion potential of the D36 steel do not depend on the number of active SRB, but on the accumulation of metabolism products of SRB. The anodic and cathodic reaction rate increased in the expotential stage of SRB growth and anodic reaction rate kept almost constant in the death and residual stages.