电化学渗氮对不锈钢表面结构的影响

doi:10.11901/1005.3093.2023.201

材料研究学报

2024, Vol. 38

Issue (3): 161-167 DOI: 10.11901/1005.3093.2023.201

研究论文

本期目录 | 过刊浏览

电化学渗氮对不锈钢表面结构的影响

陈真勇¹^,², 魏欣欣³, 徐妍婷¹^,², 张波³(

), 马秀良³^,⁴

^1.中国科学技术大学材料科学与工程学院沈阳 110016
^2.中国科学院金属研究所沈阳材料科学国家研究中心沈阳 110016
^3.松山湖材料实验室大湾区显微科学与技术研究中心东莞 523830
^4.中国科学院物理研究所北京 100190

Effect of Electrochemical Nitriding on the Surface Structure of Stainless Steel

CHEN Zhenyong¹^,², WEI Xinxin³, XU Yanting¹^,², ZHANG Bo³(

), MA Xiuliang³^,⁴

^1.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
^2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang National Laboratory for Materials Science, Shenyang 110016, China
^3.Songshan Lake Materials Laboratory, Bay Area Center for Electron Microscopy, Dongguan 523830, China
^4.Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

引用本文:

陈真勇, 魏欣欣, 徐妍婷, 张波, 马秀良. 电化学渗氮对不锈钢表面结构的影响[J]. 材料研究学报, 2024, 38(3): 161-167.
Zhenyong CHEN, Xinxin WEI, Yanting XU, Bo ZHANG, Xiuliang MA. Effect of Electrochemical Nitriding on the Surface Structure of Stainless Steel[J]. Chinese Journal of Materials Research, 2024, 38(3): 161-167.

全文: PDF(7289 KB) HTML

摘要:

使用原子力显微技术和透射电子显微技术等手段，研究了电化学渗氮的304L不锈钢多尺度下表面结构的演变。结果表明，在电化学渗氮电位下304L不锈钢表面发生了钝化膜的局部阴极还原、金属基体的微区阳极溶解以及溶解的金属阳离子再沉积，从而形成了起伏幅度为几十纳米的微观粗糙表面。在扫描透射成像模式下进行的超级能谱分析结果表明，表面沉积物的主要组成是Fe的氧化物，进一步佐证了在渗氮过程中发生了Fe的微区阳极溶解和Fe阳离子的再沉积过程。

关键词 ：材料表面与界面, 表面结构演变, 电化学渗氮, 透射电子显微技术, 原子力显微技术, 304L不锈钢

Abstract：

Nitrogen is well known as a beneficial alloying element which entitles stainless steels an enhanced corrosion resistance against chloride attack. The introduction of N into the surface of stainless steel can be achieved by electrochemical nitriding. The role that Nitrogen plays in pitting resistance has long been discussed focusing on the distribution and incorporation form of N as well as the modification to the local corrosive circumstance induced by the N-participated electrode reactions. For electrochemical nitriding, stainless steel surface, as the place on which involved electrode reactions occur, is expected to undergo structural evolution. This, to some extent, would influence the corrosion property of nitrided stainless steel. Detecting the structural evolution occurring in the electrochemical nitriding is of great significance for deciphering the involved electrode reactions and thus optimizing the nitriding parameters. In this work, using atomic force microscopy as well as transmission electron microscopy, we have clarified the concomitant localized reductive dissolution of passive film, anodic dissolution of metal matrix at micro-anodic sites, as well as re-deposition of the dissolved metal cations, which roughens the surface by forming the undulations at surface with undulation amplitude in the range of a few tens of nanometers. Element mapping analysis by Super EDS technique reveals that the re-deposited product is mainly comprised of iron oxide, which indicates iron is dissolved and the resultant iron cations occurs re-deposition.

Key words： material surface and interface surface structural evolution electrochemical nitriding transmission electron microscopy atomic force microscopy 304L stainless steel

收稿日期: 2023-03-24

ZTFLH:

TG174.4

基金资助:国家自然科学基金(51971228);国家自然科学基金(51771212)

通讯作者: 张波，研究员，bozhang@sslab.org.cn，研究方向为基于电子显微学的腐蚀基础科学

Corresponding author: ZHANG Bo, Tel:13624078267, E-mail: bozhang@sslab.org.cn

作者简介: 陈真勇，男，1998年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2023.201 或 https://www.cjmr.org/CN/Y2024/V38/I3/161

图1 电化学渗氮电流密度随渗氮时间的变化

图2 304L不锈钢电化学渗氮前后在3.5%NaCl溶液中的阳极极化曲线

图3 电化学渗氮对304L不锈钢表面结构的影响

图4 304L不锈钢电化学渗氮前后的剖面显微图像

图5 电化学渗氮后沉积在不锈钢表面的沉积物能谱

图6 304L不锈钢渗氮前后的电化学阻抗谱

表1 电化学渗氮前后EIS曲线拟合的参数值

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