硫酸盐还原菌模拟生物膜对907A钢腐蚀的影响

907A STEEL CORROSION IN ARTIFICIAL SULFATE REDUING BACTERIA BIOFILM

根据生物膜的结构特征,以硫酸盐还原菌和琼脂的混合物沉积于907A钢表面,形成人工模拟生物膜,采用微电极研究了模拟生物膜下溶解氧的分布情况,采用环境扫描电镜和能谱表征了模拟生物膜下907A钢在不同环境中的腐蚀情况。研究结果表明在人工模拟生物膜内,距离金属材料表面越近,溶氧量越低;金属材料的腐蚀情况受环境影响,当环境中富含还原性物质且SRB生长旺盛时,907A钢腐蚀严重,腐蚀产物以硫化铁为主,当环境中缺乏还原性物质且SRB生长不良时,907A钢的腐蚀产物以铁氧化物为主。

Biofilm is one of the main factors that influence metal corrosion. According to the structure and property of biofilm, the compound of natural biopolymer agar and SRB cells were deposited on 907A surface. Artificial biofilm was produced. The dissolved oxygen concentration in artificial biofilm was studied by microsensors. Environmental scanning electron microscopy （ESEM） and energy dispersive X-ray detector （EDAX） were used to study 907A corrosion under artificial biofilm. The result indicated that the oxygen concentration became lower and lower with the distance between metal surface and test location becoming small. The corrosion morphology and corrosion products of 907A were influenced by environment.