车轮钢ER8在中性NaCl溶液中的电化学腐蚀行为

宋智博, 叶榕伟, 邹港, 黄挺博, 刘吉华, 何成刚, 徐志彪, 林群煦

doi:10.16577/j.issn.1001-1560.2024.0036

材料保护 >

2024 , Vol. 57 >Issue 2: 76 - 83

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0036

研究篇

车轮钢ER8在中性NaCl溶液中的电化学腐蚀行为

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¹五邑大学轨道交通学院； ²五邑大学机械与自动化学院； ³佛山智能装备技术研究院

何成刚，硕士生导师，主要研究方向腐蚀与防护、工程摩擦学，E-mail: hechengan＠126.com

收稿日期: 2023-04-20

修回日期: 2023-06-14

录用日期: 2023-06-25

网络出版日期: 2024-03-08

基金资助

广东省基础与应用基础研究基金项目(2019A1515110807)；广东省教育厅特色创新项目(2023KTSCX151)；江门市科技计划项目(2021030101720004620)；五邑大学高层次人才科研启动计划项目(AG2018001)

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Electrochemical Corrosion Behavior of ER8 Wheel Steel in Neutral NaCl Solution

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(1a.School of Railway Transportation， 1b.School of Mechanical and Automation， Wuyi University， Jiangmen 529020， China；2.Foshan Institute of Intelligent Equipment Technology， Foshan 528234， China)

HE Chenggang， Master Supervisor， Research Focus: Corrosion and Protection， Engineering Tribology， E-mail:hechengan＠126.com

Received date: 2023-04-20

Revised date: 2023-06-14

Accepted date: 2023-06-25

Online published: 2024-03-08

Supported by

Guangdong Basic and Applied Basic Research Foundation (2019A1515110807)；Characteristic Innovation Projects of General Universities of Guangdong Province ( 2023KTSCX151 )； Science and Technology Plan Project of Jiangmen(2021030101720004620)； Research Initiation Program for High-level Talents of Wuyi University (AG2018001)

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摘要

为研究ER8 车轮钢在沿海中性氯盐环境下的腐蚀行为，通过电化学测试、腐蚀失重试验，结合扫描电镜(SEM)、X 射线衍射(XRD)技术对ER8 车轮钢在3 种不同浓度中性NaCl 溶液中的电化学腐蚀行为进行分析。极化曲线结果表明浸泡初期5.0%NaCl 浓度下自腐蚀电流密度(Jcorr)最大，576 h 后Jcorr在2.0%、3.5%NaCl 浓度下均持续增大，腐蚀速率在2 160 h 时均大于0.12 mm/a。 SEM 结果显示腐蚀产物形貌主要为片状与团簇状结构，初期腐蚀产物形貌具有较多孔隙，难以阻碍Cl-与基体发生反应，2 160 h 时腐蚀产物结构更为均匀致密。 XRD 结果表明腐蚀产物主要由γ-FeOOH、α-FeOOH 与Fe3O4组成。

关键词： 车轮钢; ER8; 中性NaCl 溶液; 腐蚀速率; 锈蚀层

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宋智博, 叶榕伟, 邹港, 黄挺博, 刘吉华, 何成刚, 徐志彪, 林群煦 . 车轮钢ER8在中性NaCl溶液中的电化学腐蚀行为[J]. 材料保护, 2024 , 57(2) : 76 -83 . DOI: 10.16577/j.issn.1001-1560.2024.0036

Abstract

In order to study the corrosion behavior of ER8 wheel steel in coastal neutral chlorine salt environment，the electrochemical corrosion behavior of ER8 wheel steel in neutral NaCl solutions with three different concentrations were analyzed through electrochemical tests， corrosion weight loss tests，scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques.The polarization curve results showed that the self-corrosion current density (Jcorr) was the largest in 5.0%(mass fraction， the same below) NaCl solution at the initial stage of immersion.After immersed for 576 h， Jcorr continued to increase at 2.0%and 3.5%NaCl solutions， and the average corrosion rate was more than 0.12 mm/a for 2 160 h.The SEM results indicated that the morphology of corrosion products were mainly flake and cluster structures.Because the morphology of corrosion products at the initial stage had more pores， it’s difficult to prevent Cl- from reacting with the substrate.The structure of corrosion products was more uniform and denser for 2 160 h.Moreover，the XRD results showed that the corrosion products were mainly composed of γ-FeOOH， α-FeOOH and Fe3O4.

Key words： wheel steel; ER8; neutral NaCl solution; corrosion rate; rust layer

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