Interaction between sulfate-reducing bacteria and aluminum alloys——Corrosion mechanisms of 5052 and Al-Zn-In-Cd aluminum alloys

Fang Guan^1,2,3，Jizhou Duan^1,2,3，Xiaofan Zhai^1,4,3，Nan Wang^1,4,3,5，Jie Zhang^1,2,3，Dongzhu Lu^1,2,3，Baorong Hou^1,2,3

1. Key Laboratory of Marine Environmental Corrosion and Bio-Fouling, Institute of Oceanology, Chinese Academy of Sciences2. Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology (Qingdao)3. Center for Ocean Mega-Science, Chinese Academy of Sciences4. Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology(Qingdao)5. University of Chinese Academy of Sciences

摘 要：Microbiologically influenced corrosion caused by sulfate-reducing bacteria（SRB） poses a serious threat to marine engineering facilities.This study focused on the interaction between the corrosion behavior of two aluminum alloys and SRB metabolic activity.SRB growth curve and sulfate variation with and with aluminum were performed to find the effect of two aluminum alloys on SRB metabolic activity.Corrosion of 5052 aluminum alloy and Al-Zn-In-Cd aluminum alloy with and without SRB were performed.The results showed that both the presence of 5052 and Al-Zn-In-Cd aluminum alloy promoted SRB metabolic activity,with the Al-Zn-In-Cd aluminum alloy having a smaller promotion effect compared with 5052 aluminum alloy.The electrochemical results suggested that the corrosion of the Al-Zn-In-Cd aluminum alloy was accelerated substantially by SRB.Moreover,SRB led to the transformation of Al-Zn-In-Cd aluminum alloy corrosion product from Al（OH）₃ to Al₂ S₃ and NaAlO₂.

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