铀尾矿土壤优势微生物对普通碳钢腐蚀行为的影响  

The Effect on Corrosion Behavior of Carbon Structureal Steel in the Dominant Fungi Coming from Uranium Tailings

作　　者：李梓番 罗学刚[2,3] 张楠[1,2] 

机构地区：[1]西南科技大学生命科学与工程学院,绵阳621010 [2]西南科技大学生物质材料教育部工程研究中心,绵阳621010 [3]西南科技大学核废物与环境安全国防重点学科实验室,绵阳621010

出　　处：《武汉理工大学学报》2014年第12期106-111,共6页Journal of Wuhan University of Technology

基　　金：国家核设施退役和放射性废物治理专题研究项目(12zg6104)

摘　　要：以铀尾矿场址土壤中筛选的优势真菌菌群作为Q235A钢片的腐蚀基质,采用分批补料培养的方式进行培养,通过钢片表面的真菌膜结构的红外图谱分析,腐蚀速率的测定以及钢片试件的电化学测试研究了真菌对Q235A的腐蚀行为。结果表明:通过一段时间的浸泡,钢片表面的真菌膜结构中含有具有加速腐蚀作用的多糖、脂蛋白、细胞外高聚物等物质的官能团O—H、—CH3、C=C、C—C和C—O;真菌对Q235A的腐蚀速率随着时间的增加而增大,浸泡90d时腐蚀速率增加到0.141mm/年,比对照组增加了0.07mm/年;电化学测试发现,当真菌存在的条件下,腐蚀电位降低,腐蚀电流增大,说明此条件下Q235A更容易受到腐蚀作用,同时造成局部微电池,加速金属阳极溶解,真菌的存在促进了试件的腐蚀。文中的结果可为金属的微生物腐蚀与防护提供一定的参考。The dominant Fungi were separated from soil of Hunan uranium tailings and were cultured as corrosion oi Q235A matrix in the mode of flora fed-batch culture. We used them to study corrosion behavior of carbon structureal steel by using Fourier transformed infrared and Electrochemical Measurement Technology. The experimental results showed that after a period of immersion, the structure of Fungi on the steel surface contains functional groups such as O-H, -CH3, C = C, C-C and C-O of polysaccharide, lipoprotein and extracellular polymer, which can accelerated corrosion. The corrosion rate of Q235A increased with the increasing immersion time in medium with the Fungi. And it increased to 0. 141 mm/a after exposed for 90d. The corrosion potential （Ecorr） decreased, and the corrosion current density （Icorr） increased in the Fungi medium in the electrochemical tests, which shows that the Fungi accelerated anoclie dissolution of metal. The results also indicated that the Q235A specimens were easier to be corroded with time by forming micro cell. The study would be helpful to provide certain referenee for the corrosion and protection of metals.

关 键 词：普通碳素钢(Q235A) 真菌 分批补料培养 腐蚀行为 电化学测试 

分 类 号：TG172[金属学及工艺—金属表面处理]