腐蚀
材料科学
收缩率
开尔文探针力显微镜
原电池
复合材料
冶金
石墨
多孔性
沉浸式(数学)
电偶腐蚀
纳米技术
原子力显微镜
数学
纯数学
作者
Tianqi Chen,Bingqin Wang,Liang Sun,Chao Liu,Xuequn Cheng,Yong Li
标识
DOI:10.1016/j.corsci.2023.111798
摘要
This study investigated the coupling mechanism of shrinkage defects and graphite on the corrosion resistance of ductile iron by electrochemical measurements, quasi-in-situ immersion tests and numerical simulations. The detrimental impact of shrinkage defects was confirmed by elevated corrosion current density and the formation of a porous corrosion product layer. Multiple-galvanic coupling effect among the matrix, graphite, and shrinkage defects serves as corrosion triggers, which is verified by scanning Kelvin probe force microscopy (SKPFM) and numerical simulations. Additionally, quasi-in-situ observations corroborate the deposition of corrosion products and Cl enrichment at defect bottoms, expediting occluded cell formation and corrosion propagation.
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