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A new method to determine the synergistic effects of area ratio and microstructure on the galvanic corrosion of LAS A508/309 L/308 L SS dissimilar metals weld

查看全文 作　　者：Bright [1,2]O.Okonkwo;Hongliang [1]Ming;Jianqiu [1]Wang;En-Hou [1]Han;Ehsan [3,4]Rahimi;Ali [3,5]Davoodi;Saman [6]Hosseinpour 高影响力作者 机构地区：[1]CAS Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;[2]School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China;[3]Materials and Metallurgical Engineering Department,Faculty of Engineering,Ferdowsi University of Mashhad,Mashhad 9177948974,Iran;[4]Polytechnic Department of Engineering and Architecture,University of Udine,33100 Udine,Italy;[5]John A.Paulson School of Engineering and Applied Sciences,Harvard University,Cambridge,MA 02138,USA;[6]Institute of Particle Technology(LFC),Friedrich-Alexander-Universitdt-Erlangen-Numberg(FAU),91058 Erlangen,Germany高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2021年第19期,共13页高影响力期刊 基　　金：the National Natural Science Foundation of China(No.51771211);Key Research Program of Frontier Sciences,CAS(QYZDY-SSW-JSC012);the Key Program of the Chinese Academy of Sciences(ZDRW-CN-2017-1)。 摘　　要：The synergistic effects of area ratio and microstructure on the galvanic corrosion of A508/309 L/308 L dissimilar metals weld(DMW)are studied by a multi-analytical approach.It was demonstrated that decreasing the anode/cathode surface area ratio obviously enhances the corrosion rate of A508,both locally and globally.Deeper analyses of the AFM results enabled quantitative comparison of the corrosion behaviour of the different surface constituents.It was revealed that in the galvanic interaction of the DMW,the grain refined region corrodes most,followed by the partial grain refined region and base metal matrix of the A508,respectively.The electrochemical localization index(LI)estimation method and AFM analysis both confirmed the presence of a mixed(localized and uniform)corrosion phenomenon occurring on the surface of the A508 anode metal in the galvanic interaction of the dissimilar metals.Finally,the degree of synergism equation was utilized to describe the synergistic effects of anode/cathode area ratio and the microstructure of the samples on the galvanic corrosion of LAS A508/309 L/308 L SS DMW. 关 键 词：Low alloy steel Stainless steel SEM AFM Galvanic corrosion INCLUSION
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