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Citation: LI Song-Mei, BAI Ru-Bing, LIU Jian-Hua, YU Mei, . Corrosion Behavior of Steel A3 under the Combined Effect of Streptomyces and Nocardia sp[J]. Acta Physico-Chimica Sinica, ;2009, 25(05): 921-927. doi: 10.3866/PKU.WHXB20090518 shu

Corrosion Behavior of Steel A3 under the Combined Effect of Streptomyces and Nocardia sp

1.
Key Laboratory of Aerospace Materials and Performance, Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing 100191, P. R. China

Corresponding author: ,
Received Date: 14 November 2008
Available Online: 18 March 2009

The weight lossmethod, electrochemical impedance spectroscopy (EIS) and surface analysis methods were employed to investigate the corrosion behavior of steel A3 under the combined effect of Streptomyces and Nocardia sp. Results showed that the combined effect of Streptomyces and Nocardia sp markedly increased the corrosion tendency of steel A3, decreased the impedance value and increased the corrosion current density of the electrode after 21 days of exposure. Corrosion mass loss rate in the mixed colonies solution was more than the sum of the loss rate for each individual microorganism. Scanning electron microscopy (SEM) results indicated that localized corrosion occurred on the steel A3 coupon immersed in the mixed colonies solution. The combined effect of Streptomyces and Nocardia sp aggravated the corrosion of steel A3.
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