一种化能异养细菌对碳钢腐蚀的电化学研究

ELECTROCHEMICAL STUDY ON CARBON STEEL CORROSION INDUCED BY A CHEMOTROPHIC HETEROTROPHIC BACTERIA

采用极化曲线和电化学交流阻抗 (EIS)研究了小球菌对A3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 值较为接近 ,表明细菌的生长代谢过程渐趋于稳定 ,两种暴露条件下所形成的生物膜趋向于成熟一致 ;(3)分别提出了有菌和无菌条件下EIS的等效电路 ,并计算了相应的等效元件参数 ;(4)

The corrosion of A3 carbon steel induced by micrococcus was studied using polarization curve and AC-impedance techniques.The results indicated:(1) When micrococcus existed,carbon steel corrosion was accelerated by a loose and heterogeneous biofilm formed on its surfaces;(2) R po and C c values were close after two days and four days immersion respectively in solutions with micrococcus,which indicated that the metabolization of bacteria became stable,and the biofilms under two conditions were tend to be ripe and accordant;(3) The equivalent circuits for situations without or with bacteria were proposed respectively,and the parameters in circuits were also calculated;and (4) Corrosion reaction impedance with micrococcus showed dispersion effect.