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2 d、4 d的Rpo值和C c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）小球菌影响下腐蚀反应的阻抗行为存在弥散效应。
The corrosion of A3 carbon steel induced by micrococ cus was studied using polarization curve and AC-impedance techniques.The resul ts indicated:(1) When micrococcus existed,carbon steel corrosion was accelerated by a loose and heterogeneous biofilm formed on its surfaces;(2)Rpo an d Cc values were close after two days and four days immersion respectively in solutions with micrococcus,which indicated that the metabolization of bacteria became sta ble,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) Corrosi on reaction impedance with micrococcus showed dispersion effect.
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