微生物影响下不锈钢焊缝的腐蚀机理  

MICROBIOLOGICALLY INFLUENCED CORROSION ON WELD OF STAINLESS STEEL

作　　者：陈志刚[1] 凌云[1] P.Guempel M.Kasser 

机构地区：[1]江苏理工大学材料科学与工程学院,镇江212013 [2]Industrial University of Konstance

出　　处：《金属学报》2001年第7期741-744,共4页Acta Metallurgica Sinica

基　　金：德国巴登-符腾堡州政府科研基金资助项目

摘　　要：从水化学、材料表面特征及微生物种类３方面研究了不锈钢３０４Ｌ焊缝微生物腐蚀．用微生物腐蚀实验台测量了试样的开路电位．结果表明，在有微生物的水介质中的试样产生了电位升，而无微生物的水介质中的试样没有电位升．当微生物腐蚀发生时．电位急剧下降．在几种焊接缺陷中，金黄色回火膜对微生物腐蚀最敏感．研究表明，当水中ＣＩ－含量较高时，容易发生微生物腐蚀．用ＳＥＭ对点蚀坑进行了观察，并用ＥＤＸＡ分析了部分腐蚀产物．微生物分析在腐蚀试样与未腐蚀试样表面最明显的区别是 Ｍｎ－Ｆｅ氧化菌的数量．The influence of welding defects, water compositions and microbiological species on MIC (microbiologically influenced corrosion) was studied. The open circuit potential (OCP) was measured during MIC test. It was found that OCP shifted to a higher level when the system was inoculated with bacteria and it decreased dramatically when MIC started. As a contrast, the OCP kept stable in the system without bacteria. Among a series of welding defects the golden heat tint was found to be the most susceptible to MIC. It was found that pitting corrosion happened when Cl(-)content in the water was high. The tubercles over pitting were observed with SEM. Some elements inside of the tubercles were measured with EDXA. Microbiological analysis of a corroded and a non-corroded samples revealed the significant difference to be number of the Mn-Fe oxidizing bacteria between them.

关 键 词：微生物腐蚀 不锈钢 焊缝 电位升 

分 类 号：TG172.7[金属学及工艺—金属表面处理] TG142.71[金属学及工艺—金属学]