文献类型：期刊文献

英文题名：Research on the mechanism of microbial corrosion in the subsurface layer of 7075 aluminum alloy under different corrosion environments with ultra low temperature double increase effect

作者：Zhang, Ping[1,2];Yue, Xiujie[2,3];Sun, Yajie[1];Zhou, Hanping[1];Zhang, Jinlong[1];Wang, Youqiang[3]

机构：[1]Guangdong Ocean Univ, Coll Mech & Power Engn, Zhanjiang, Peoples R China;[2]Qingdao Huanghai Univ, Coll Intelligent Mfg, Qingdao 266520, Peoples R China;[3]Qingdao Univ Technol, Coll Intelligent Mfg, Qingdao 266520, Peoples R China

年份：2024

卷号：227

外文期刊名：VACUUM

收录：SCI-EXPANDED(收录号：WOS:001259632800001)、、EI(收录号：20242516271759)、Scopus(收录号：2-s2.0-85196046587)、WOS

基金：Funding: The work was supported by the National Natural Science Foundation of China (51705270) , the National Natural Science Foundation of China (No.51575289) ,the Natural Science Foundation of Guangdong Province (No.2023A1515030171) , Science and Technology Project of Zhanjiang City, Guangdong Province (No.2022A01004) , the Natural Science Foundation of Shandong Province (No.ZR2016EEP03) , the Applied Basic Research Program of Qingdao city (No.19-6-2-69-cg) and Shandong Qingchuang Science and Technology Project (No.2019KJB022) , the Natural Science Foundation of Shandong Province (No.ZR2022QE149) .

语种：英文

外文关键词：Deep cooling treatment; Dual-enhancement effect; Microbiologically influenced corrosion; 7075-T6 aluminum alloy; Electrochemical impedance spectroscopy

外文摘要：Aluminum alloys exhibit a dual-enhancement effect, characterized by simultaneous increases in strength and ductility at ultra-low temperatures. This study investigates the effects of deep cooling time and corrosion time on the surface quality, elemental distribution, corrosion product films, and electrochemical properties of 7075 aluminum alloy using techniques such as scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and electrochemical testing. The research reveals that 7075 aluminum alloy surfaces are primarily covered with blocky corrosion products after microbiologically induced corrosion (MIC) in polar marine (PM) conditions, composed mainly of Al(OH)(3), Al2O3, and AlCl3. In contrast, in boreal marine (BM) conditions, the surfaces mainly feature cluster-like corrosion products composed of Al(OH)(3) and Al2O3. PM exhibits a lower self-corrosion potential compared to BM, and after 5 days of MIC, the self-corrosion potential of 7075 aluminum alloy in PM shifts positively by 0.612 V compared to BM. The BM-9 sample shows the lowest self-corrosion current density at 3.777 x 10<^>-7 A/cm(2), reduced by 81.3 % compared to PM-9, with the BM-9 sample exhibiting the highest polarization resistance at 9.15 x 10<^>3 Omega cm(2). In comparison to the PM MIC environment, BM MIC conditions result in better surface quality and electrochemical characteristics for 7075 aluminum alloy.