细菌对碳钢腐蚀的电化学研究

ELECTROCHEMICAL STUDIES ON CARBON STEEL CORROSION INDUCED BY BACTERIA

采用开路电位测量、极化曲线和电化学交流阻抗法 (EIS)研究了小球菌对 4 5 # 碳钢的腐蚀行为。结果表明 :(1)小球菌存在时试样表面上所形成的疏松、不均匀的生物膜加速了碳钢的腐蚀过程 ;(2 )有菌存在时暴露2d、4d的Rpo值和Cc 值非常接近 ,表明细菌的生长代谢过程已趋于稳定 ,两种暴露条件下所形成的生物膜趋向于成熟一致 ;(3)分别提出了不同暴露条件下EIS的等效电路 ,并计算了相应的等效元件参数 ;(4)

The corrosion behavior of carbon steel by micrococcus was studied using measurements of open circuit potential. polarization curve and AC impedance. The results indicated: (1) When micrococcus existed, carbon steel corrosion was accelerated by the loose and heterogeneous biofilm formed on sample surfaces. (2) R po and C c values after immerging for two days and four days with micrococcus were very close, which indicated that the metabolization of bacteria had been stable, and the biofilms under two conditions tended to be ripe and accordant. (3) The equivalent circuits under different immerging conditions were proposed, and the parameters in circuits were also calcuated. (4) Corrosion reaction impedance with micrococcus showed dispersioin effect.