Effect of Sulfate-Reducing Bacteria and Iron-Oxidizing Bacteria on the Rate of Corrosion of an Aluminum Alloy in a Central Air-Conditioning Cooling Water System

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• 作者：Hongfang Liu ; Bijuan Zheng ; Dandan Xu ; Chaoyang Fu ; Yi Luo
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：May 14, 2014
• 年：2014
• 卷：53
• 期：19
• 页码：7840-7846
• 全文大小：564K
• 年卷期：v.53,no.19(May 14, 2014)
• ISSN：1520-5045

文摘

The microbiologically influenced corrosion behaviors of the 3A21 aluminum alloy in Wuhan (Hubei Province, China) municipal potable water containing wild-type total culturable bacteria (TCB) at different temperatures were investigated by mass loss and surface morphology analysis. When the water was inoculated with sulfate-reducing bacteria (SRB), laboratory results showed that SRB inhibited the mass loss-based rate of corrosion of the Al alloy coupons at 30 掳C but accelerated the corrosion rate by 2- and 4.6-fold at 45 and 60 掳C, respectively. It was also found that the presence of aerobic iron-oxidizing bacteria (IB) significantly reduced the corrosion rate at 45 掳C. The average corrosion rate in water inoculated with enriched TCB was the highest, and it decreased at higher temperatures. At 60 掳C, SRB were found to be the dominant bacteria in the water with TCB and in the water with IB.