<strong>6</strong>种典型商用纯铁和钢材在<strong>3.5%NaCl</strong>溶液中的初期腐蚀行为

doi:10.11902/1005.4537.2024.338

中国腐蚀与防护学报

2025, Vol. 45

Issue (2): 469-478 CSTR: 32134.14.1005.4537.2024.338 DOI: 10.11902/1005.4537.2024.338

研究报告

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6种典型商用纯铁和钢材在3.5%NaCl溶液中的初期腐蚀行为

杨震宇¹^,², 基超¹^,², 郭丽雅¹^,²(

), 徐闰¹^,², 彭伟¹^,², 赵洪山¹^,², 韦习成¹^,², 董瀚¹^,²

^1.上海大学材料科学与工程学院上海 200444
^2.上海大学(浙江)高端装备基础件材料研究院嘉兴 314113

Initial Corrosion Behavior of Several Pure Irons and Steels in 3.5%NaCl Solution

YANG Zhenyu¹^,², JI Chao¹^,², GUO Liya¹^,²(

), XU Run¹^,², PENG Wei¹^,², ZHAO Hongshan¹^,², WEI Xicheng¹^,², DONG Han¹^,²

^1.School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
^2.Zhejiang Institute of Advanced Materials, Shanghai University, Jiaxing 314113, China

引用本文:

杨震宇, 基超, 郭丽雅, 徐闰, 彭伟, 赵洪山, 韦习成, 董瀚. 6种典型商用纯铁和钢材在3.5%NaCl溶液中的初期腐蚀行为[J]. 中国腐蚀与防护学报, 2025, 45(2): 469-478.
Zhenyu YANG, Chao JI, Liya GUO, Run XU, Wei PENG, Hongshan ZHAO, Xicheng WEI, Han DONG. Initial Corrosion Behavior of Several Pure Irons and Steels in 3.5%NaCl Solution[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(2): 469-478.

全文: PDF(14445 KB) HTML

摘要:

采用电化学和浸泡腐蚀实验，结合扫描电镜、3D光学轮廓仪和显微Raman光谱仪等研究了纯铁3N2、4N2、5N2以及普碳钢Q235B、耐候钢SPA-H、不锈钢304L在3.5%NaCl溶液中的初期腐蚀行为。电化学阻抗谱结果表明样品的腐蚀速率为：304L < 5N2 < 4N2 < 3N2 < SPA-H < Q235B。扫描电镜和3D轮廓仪揭示了纯铁3N2、4N2和5N2发生了局部腐蚀，其中3N2蚀坑最深。各样品表面腐蚀产物的主要成分为Fe₃O₄、γ-FeOOH和α-FeOOH。

关键词 ：纯铁, 电化学, 蚀坑, 腐蚀产物

Abstract：

The initial corrosion behavior of three pure irons of different purity 3N2, 4N2 and 5N2, carbon steel Q235B, weathering steel SPA-H and stainless steel 304L in 3.5%NaCl solution was comparatively investigated by means of immersion test, electrochemical measurements, scanning electron microscopy, 3D profiling microscope and laser confocal Raman microscope. Results showed that according to the electrochemical impedance value, the corrosion rate of the six test materials from low to high is as following: 304L < 5N2 < 4N2 < 3N2 < SPA-H < Q235B. The scanning electron microscopy observation and 3D profiling microscope measurement revealed that the three pure irons 3N2, 4N2 and 5N2 exhibited localized corrosion; while the 3N2 presented the deepest corrosion pits. The corrosion products mainly consisted of Fe₃O₄, γ-FeOOH and α-FeOOH for all the six test materials.

Key words： pure iron electrochemistry corrosion pits corrosion products

收稿日期: 2024-10-14 32134.14.1005.4537.2024.338

ZTFLH:

TG174

基金资助:国家自然科学基金(42276214);国家自然科学基金(52201078);上海市青年科技英才扬帆计划(21YF1412800)

通讯作者: 郭丽雅，E-mail：liya_guo@shu.edu.cn，研究方向为钢的腐蚀与防护

Corresponding author: GUO Liya, E-mail: liya_guo@shu.edu.cn

作者简介: 杨震宇，男，2000年生，硕士生

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表1 材料的化学成分 (mass fraction / %)

图1 Q235B、SPA-H、304L以及3N2、4N2和5N2的显微组织

表2 样品中夹杂物数量

图2 6种材料在3.5%NaCl溶液中浸泡1 h后表面XPS分析

图3 全浸实验样品表面形成的钝化膜或氧化膜中Fe 2p各组分占比及Fe2+和Fe3+比

图4 6种材料在3.5%NaCl溶液浸泡1 h后的开路电位图

图5 6种实验材料在3.5%NaCl溶液浸泡1 h的EIS及等效电路图

表3 6种实验材料在3.5%NaCl溶液浸泡1 h后的EIS拟合数据

图6 6种实验材料在3.5%NaCl溶液中浸泡1 h后的动电位极化曲线

表4 浸泡于3.5%NaCl溶液1 h后样品的自腐蚀电位和腐蚀电流密度

图7 6种实验材料在3.5%NaCl溶液中浸泡1 h并除锈后的SEM图和3D轮廓仪图

表5 浸泡于3.5%NaCl溶液中1 h后样品的腐蚀坑特征

图8 除304L外其它5种实验材料在3.5%NaCl溶液中浸泡1 h后的拉曼光谱

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