The ennoblement of stainless steel by manganic oxide biofouling

被引：85

作者：

Dickinson, WH

Caccavo, F

Lewandowski, Z

机构：

[1] Center for Biofilm Engineering, 409 Cobleigh Hall, Montana State University, Bozeman

来源：

CORROSION SCIENCE | 1996年 / 38卷 / 08期

基金：

美国国家科学基金会;

关键词：

stainless steel; polarization; SEM;

D O I：

10.1016/0010-938X(96)00031-5

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Twenty-three 316L stainless steel (SS) coupons were exposed in situ to fresh river-water for periods of up to 35 days. All samples developed steady-state corrosion potentials (E(corr)) near + 350 mV (SCE) and polarization measurements showed enhanced cathodic current density characteristic of passive metal ennoblement. Epifluorescence and scanning electron microscopy of the attached biofilm showed numerous 10-20 mu m diameter Mn-rich annular deposits, associated clusters of bacterial cells, and abundant sheathed bacteria. Dissolution of the Mn deposits using Na2SO3 shifted E(corr) to pre-exposure values. SS coated with MnO2 paste displayed electrochemical behavior nearly identical to that of ennobled samples. A mechanism of ennoblement by MnO2 biofouling is proposed which explains a variety of findings on the electrochemical behavior of microbially colonized SS. Copyright (C) 1996 Published by Elsevier Science Ltd.

引用

页码：1407 / 1422

页数：16