Investigation of mortar corrosion by an acidophilic sulfur-oxidizing microorganism A.thiooxidans  

嗜酸硫氧化菌A.thiooxidans对砂浆的腐蚀影响

作　　者：WANG Dong-sheng FENG Chao GUAN Fang SAND Wolfgang KRISHNAMURTHY Mathivanan WAN Fei ZHANG Rui-yong 王东升;冯超;管方;SAND Wolfgang;KRISHNAMURTHY Mathivanan;万菲;张瑞永(School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China;Key Laboratory of Advanced Marine Materials,Key Laboratory of Marine Environmental Corrosion and Bio-fouling,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;Guangxi Key Laboratory of Marine Environmental Science,Institute of Marine Corrosion Protection,Guangxi Academy of Sciences,Nanning 530007,China;Aquatic Biotechnology,University of Duisburg-Essen,45141 Essen,Germany;Institute of Biosciences,Freiberg University of Mining and Technology,09599 Freiberg,Germany)

机构地区：[1]School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China [2]Key Laboratory of Advanced Marine Materials,Key Laboratory of Marine Environmental Corrosion and Bio-fouling,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China [3]Guangxi Key Laboratory of Marine Environmental Science,Institute of Marine Corrosion Protection,Guangxi Academy of Sciences,Nanning 530007,China [4]Aquatic Biotechnology,University of Duisburg-Essen,45141 Essen,Germany [5]Institute of Biosciences,Freiberg University of Mining and Technology,09599 Freiberg,Germany

出　　处：《Journal of Central South University》2024年第10期3423-3434,共12页中南大学学报（英文版）

基　　金：Project(42476209)supported by the National Natural Science Foundation of China;Project(2023GXNSFBA026252)supported by the Youth Science Foundation of Guangxi Province,China;Project(ZR2023MD024)supported by the Natural Science Foundation of Shandong Province,China;Project(JC22022104)supported by the Natural Science Foundation of Nantong,China;Project(2023VEA0007)supported by the Chinese Academy of Sciences President’s International Fellowship Initiative。

摘　　要：The corrosion behavior of the acidophilic sulfur-oxidizing microorganism(ASOM)Acidithiobacillusthiooxidans(A.thiooxidans)on mortar was investigated for changes of medium and mortar,as well as for weight lossand surface morphology of mortar specimens.Weight loss analysis showed that mortar weight was reduced by(15.1±2.2)%after 56 d.Morphological surface analysis of mortar specimens showed weakly structured fibrous substances with2−100μm in size.The pH variations of the mortar surface and medium indicated that biogenic sulfuric acid had beenproduced by A.thiooxidans.The results prove that A.thiooxidans accelerated concrete corrosion and caused concretefailure.混凝土砂浆是海洋及城市基础设施中的重要基础材料,然而腐蚀环境中酸性微生物引起的腐蚀影响混凝土结构的安全运行。嗜酸硫氧化菌A.thiooxidans是造成混凝土砂浆腐蚀破坏的重要原因。为了弄清A.thiooxidans对混凝土砂浆的破坏机制,本文通过检测溶液环境中钙离子和硫酸根离子的浓度变化以及砂浆的表面pH、失重、微观形貌的变化,研究A.thiooxidans对砂浆的腐蚀影响。经过A.thiooxidans 56 d的腐蚀,砂浆的失重达到了(15.1±2.2)%,而无菌对照组的砂浆失重为(10.2±0.9)%,实验组是对照组的1.5倍。SEM结果显示砂浆样品表面有大量结构较弱的纤维状腐蚀产物附着,经XRD和EDS分析其成分主要为硫酸钙。砂浆表面pH和培养液pH的变化均表明A.thiooxidans通过新陈代谢产生生物硫酸腐蚀砂浆,导致砂浆表面沉积大量腐蚀产物。该结果表明嗜酸硫氧化菌A.thiooxidans加速了混凝土的腐蚀。本文创新性地结合溶液环境中钙离子和硫酸根离子的浓度变化,在热力学基础上分析了嗜酸硫氧化菌A.thiooxidans腐蚀砂浆的机理,为发展混凝土砂浆防护技术提供了科学参考。

关 键 词：sulfur-oxidizing bacteria Acidithiobacillus thiooxidans MORTAR CORROSION biogenic sulfuric acid mass loss 

分 类 号：Q939.98[生物学—微生物学] TU37[建筑科学—结构工程] P75[天文地球—海洋科学]