Improved corrosion performance of selective laser melted stainless steel 316L in the deep-sea environment

被引：46
|
作者：
Zhao Y. [1 ]
Xiong H. [2 ]
Li X. [2 ]
Qi W. [1 ]
Wang J. [1 ]
Hua Y. [3 ]
Zhang T. [1 ]
Wang F. [1 ]
机构：
[1] Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang
[2] Corrosion and Protection Laboratory, Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Ministry of Education, Harbin
[3] Institute of Functional Surfaces, School of Mechanical Engineering, University of Leeds, Leeds
来源：
Corrosion Communications | 2021年 / 2卷
基金：
中国国家自然科学基金;
关键词：
Corrosion resistance; Dissolution; Grain boundary; Precipitation; Selective laser melting;
D O I：
10.1016/j.corcom.2021.09.002
中图分类号：
学科分类号：
摘要：
Through electrochemical and surface analysis, the composition, semi-conductive property and electrochemical performance of the passive film formed on selective laser melting stainless steel 316L (SLM SS316L) and wrought SS316L in the deep sea environment were analyzed, respectively. Results indicated that the corrosion resistance of SS316L can be enhanced by the SLM process, which is attributed to the greatly smaller grain size and higher density of grain boundaries. Grain boundary, i.e. metallurgical defects, enhances the dissolution of SS316L and releases a large quantity of Cr3+ ions at the interface. Then Cr(OH)3 precipitated and dehydrated to produce much more stable oxides Cr2O3. As a result, a thin and compact passive film formed on the SLM SS316L, which then suppressed localized corrosion and resulted in high corrosion resistance. © 2021
引用
收藏
页码：55 / 62
页数：7
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