Insight into microbiologically induced corrosion performance of magnesium in tryptic soy broth with S.aureus and E.coli  

作　　者：Tao Liang Huanhuan Zhang Haobo Pan Ying Zhao 

机构地区：[1]Shenzhen Institute of Advanced Technology,Chinese Academy of Sciences,Shenzhen 518055,China [2]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Journal of Materials Science & Technology》2022年第20期221-231,共11页材料科学技术（英文版）

基　　金：the Science and Technology Innovation Commission of Shenzhen(Nos.JCYJ20210324120009026,JCYJ20210324102013036,JCYJ20210324101809026,and JCYJ20200109114620793);the Guangdong Basic and Applied Basic Research Foundation(No.2019A1515110631);the SIAT Innovation Program for Excellent Young Researchers(No.E1G052);the National Natural Science Foundation of China(Nos.31870956 and U2001221);the Frontier Science Key Research Programs of CAS(No.QYZDB-SSWJSC030)for financially supporting this study。

摘　　要：In this research,microbiologically induced corrosion(MIC)performance of magnesium in tryptic soy broth with S.aureus or E.coli were systematically explored.The results showed that magnesium in biotic solution presented higher mass loss,thicker degradation product layer and more severe pitting corrosion compared to abiotic solution after 24 h of immersion.Electrochemical measurements including EIS spectra and polarization curve further suggested that the corrosion rate of Mg in biotic solution increased during the early stage owing to the decrease of p H,which was originated from the consumption of glucose and the resulting accumulation of acidic metabolites.However,corrosion rate subsequently decreased because of the reduction of acidic metabolites and production of alkaline compound as well as the corrosion protection provided by the corrosion product and biofilm.Moreover,the corrosion rate of magnesium in high concentration of S.aureus and E.coli solution was larger than that in low concentration of S.aureus and E.coli solution,respectively during the initial stage,but subsequently presented a reverse variation.In addition,more severe corrosion of magnesium was observed in S.aureus solution in comparison with E.coli solution.These results suggested that the MIC performance of magnesium was closely related to the concentration and species of bacteria.

关 键 词：MAGNESIUM S.aureus E.COLI Microbiologically induced corrosion 

分 类 号：TG178[金属学及工艺—金属表面处理]