采用失重法、电化学方法和表面分析技术研究了淡水微生物对Q235钢早期腐蚀行为的影响。丹江口水库现场挂片实验表明，Q235钢腐蚀失重量随着水深的增加递增。通过对各种影响因素的检测分析得出，水体不同深度的微生物浓度差异是造成该结果的主要原因。水中微生物（尤其是进行光合作用的藻类）数量随着水深增加递减，致使附着在基体表面的生物膜面积缩小，致密性变差，暴露在水中的金属表面增多，腐蚀失重增大。在实验室开展的电化学和挂片实验也证明了淡水微生物的大量存在可以降低Q235钢的腐蚀速率。腐蚀表面形貌及产物分析表明， Q235钢在富营养化淡水中形成的产物膜更致密、成分更复杂。
The effect of microbes on the early corrosion behavior of Q235 steel in fresh waters was studied using immersion tests, electrochemical measurements and surface analysis techniques. In the field immersion test at Dan Jiangkou reservoir in China, the corrosion weight loss of Q235 steel increased as the immersion water depth increased. The reason may be that the microbe amount (especially algae amount) decreased with water depth increasing, which resulted in the biofilm formed on the surface of coupons with weak density and reduced coverage area. Therefore, more surface of Q235 steel were exposed to water and the corrosion weight loss increased. This conclusion was also confirmed by the electrochemical measurements and immersion test in natural freshwater. The results of the scanning electron microscopy (SEM) and Fourier transform infra-red (FT-IR) spectra further confirmed that the surface film formed in eutrophic freshwater was thicker and with more complex corrosion products.
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