选区激光熔化MnSi2增强316L不锈钢复合材料的表面质量及耐蚀性能

doi:10.13251/j.issn.0254-6051.2022.04.027

金属热处理 ›› 2022, Vol. 47 ›› Issue (4): 165-170.DOI: 10.13251/j.issn.0254-6051.2022.04.027

选区激光熔化MnSi₂增强316L不锈钢复合材料的表面质量及耐蚀性能

李梦¹, 武美萍¹, 陆佩佩^1,2, 赵子硕¹, 缪小进¹

1.江南大学机械工程学院, 江苏无锡 214122;
2.南京信息工程大学滨江学院机械工程学院, 江苏无锡 214122

收稿日期:2021-10-15 修回日期:2021-12-27 出版日期:2022-04-25 发布日期:2022-05-19
通讯作者: 武美萍,教授,博士,E-mail: wumeiping163@163.com
作者简介:李梦(1996—),女,硕士研究生,主要研究方向为金属增材制造,E-mail: 531637045@qq.com。
基金资助:
国防科技创新特区(2016312****00103)

Surface quality and corrosion resistance of MnSi₂-reinforced 316L stainless steel composites fabricated by selective laser melting

Li Meng¹, Wu Meiping¹, Lu Peipei ^1,2, Zhao Zishuo¹, Miao Xiaojin¹

1. School of Mechanical Engineering, Jiangnan University, Wuxi Jiangsu 214122, China;
2. School of Mechanical Engineering, Binjiang College, Nanjing University of Information Science & Technology, Wuxi Jiangsu 214122, China

Received:2021-10-15 Revised:2021-12-27 Online:2022-04-25 Published:2022-05-19

摘要/Abstract

摘要： 为改善316L不锈钢在海洋环境下的耐腐蚀性能,通过MnSi₂增强316L不锈钢基体,采用选区激光熔化(SLM)制备MnSi₂/316L不锈钢复合材料。利用Image-Pro Plus软件、光学显微镜、扫描电镜(SEM)及电化学工作站研究了激光功率对316L不锈钢金属基复合材料致密度及耐腐蚀性能的影响,通过Tafel极化曲线和阻抗谱表征其耐腐蚀性能的强弱,并通过点蚀形貌揭示了其腐蚀机理。结果表明:添加MnSi₂是提高316L不锈钢耐腐蚀性能的有效途径。随着激光功率的增大,耐腐蚀性能呈现先提高后降低的趋势,当激光功率达到190 W时,2%MnSi₂/316L不锈钢复合材料的致密度为99.80%,其腐蚀电位为－0.053 V (vs SCE)。同时,2%MnSi₂可以显著改善316L不锈钢的成形质量,提高其耐腐蚀性能,其腐蚀形式为氯离子诱导氯化物生成的点蚀,且点蚀产生位置主要集中在孔隙边界处。

关键词: MnSi₂/316L不锈钢复合材料, 激光功率, 致密度, 耐腐蚀性, 点蚀

Abstract: In order to improve the corrosion resistance of 316L stainless steel in marine environment, MnSi₂-reinforced 316L stainless steel composites were prepared by selective laser melting(SLM). The effect of laser power on density and corrosion resistance of the 316L stainless steel metal matrix composites was investigated by using Image-Pro Plus software, metallographic microscope, scanning electron microscope(SEM) and electrochemical work station. The corrosion resistance was evaluated by Tafel polarization curve and impedance spectrum, and the corrosion mechanism was revealed by pitting topography. The results show that adding MnSi₂ is an effective way to improve the corrosion resistance of 316L stainless steel. When the laser power reaches 190 W, the density of 2%MnSi₂/316L stainless steel composites is 99.80% and the corrosion potential is －0.053 V (vs SCE). At the same time, the 2% MnSi₂ can significantly improve the forming quality and corrosion resistance of the 316L stainless steel. The corrosion form is the corrosive pitting of chloride induced by chloride ions, and the pitting corrosion is mainly concentrated at the pore boundary.

Key words: MnSi₂/316L stainless steel composites, laser power, density, corrosion resistance, corrosive pitting

中图分类号:

TG178

李梦, 武美萍, 陆佩佩, 赵子硕, 缪小进. 选区激光熔化MnSi₂增强316L不锈钢复合材料的表面质量及耐蚀性能[J]. 金属热处理, 2022, 47(4): 165-170.

Li Meng, Wu Meiping, Lu Peipei , Zhao Zishuo, Miao Xiaojin. Surface quality and corrosion resistance of MnSi₂-reinforced 316L stainless steel composites fabricated by selective laser melting[J]. Heat Treatment of Metals, 2022, 47(4): 165-170.

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选区激光熔化MnSi₂增强316L不锈钢复合材料的表面质量及耐蚀性能

Surface quality and corrosion resistance of MnSi₂-reinforced 316L stainless steel composites fabricated by selective laser melting

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