Effects of nanoscale Sn segregation on corrosion behavior of laser powder bed fusion Cu-15Ni-8Sn alloy  

作　　者：Pengcheng Zuo Zequn Zhang Xiaohong Qi Zhuangzhuang Liu Jiuyang Xia Junshen Wu Xiaogang Li Bowei Zhang 

机构地区：[1]Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China [2]Beijing Advanced Innovation Center for Materials Genome Engineering,University of Science and Technology Beijing,Beijing 100083,China [3]National Materials Corrosion and Protection Data Center,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《Journal of Materials Science & Technology》2023年第27期96-110,共15页材料科学技术（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.51901018);Young Elite Scientists Sponsorship Program by China Association for Science and Tech-nology(YESS,No.2019QNRC001);the Fundamental Research Funds for the Central Universities(No.FRF-AT-20-07,06500119);the Nat-ural Science Foundation of Beijing Municipality(No.2212037);the National Science and Technology Resources Investigation Program of China(No.2019FY101400);the National Natural Science Foundation of China(No.52104368).

摘　　要：Corrosion resistance of laser powder bed fusion(LPBF)Cu-15Ni-8Sn alloys is crucial towards its practical application in marine engineering.In this work,corrosion behavior of LPBF Cu-15Ni-8Sn alloy was com-prehensively investigated.The results suggest that LPBF Cu-15Ni-8Sn alloy exhibits superior corrosion re-sistance than the conventional casting counterpart and their corrosion behavior is highly associated with Sn segregation.Generally,a triple-layer film will be formed on the surface of LPBF Cu-15Ni-8Sn alloy when being exposed to 3.5 wt%NaCl solution.To be more detailed,the abundance of nanoscale Sn-rich precipitates at the molten pool boundaries promotes the initial formation of a thick inner layer,where Ni and Sn tend to be distributed at inner and outer positions of the layer,respectively.In contrast,the inner layer on molten pools is much thinner ascribed to a lower Sn content,facilitating the earlier nucleation and growth of a compact middle layer that is mainly composed of numerous Cu-rich nanoparticles.At the outmost position,CuO,Cu(OH)_(2) and Ni(OH)_(2) constitute the major composition of the loose layer.The results of this study could contribute to the optimal design and processing of additively manufactured Cu-Ni-Sn alloys.

关 键 词：Laser Powder Bed Fusion(LPBF) Cu-15Ni-8Sn alloy Sn segregation Localized corrosion Oxide film 

分 类 号：TG132.3[一般工业技术—材料科学与工程] TG665[金属学及工艺—合金]