螺纹钢中<strong>MnS</strong>夹杂物诱发的局部腐蚀行为

doi:10.11902/1005.4537.2023.337

中国腐蚀与防护学报

2024, Vol. 44

Issue (5): 1255-1262 CSTR: 32134.14.1005.4537.2023.337 DOI: 10.11902/1005.4537.2023.337

研究报告

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螺纹钢中MnS夹杂物诱发的局部腐蚀行为

韩宇龙¹^,², 李健³, 郭丽雅¹^,²(

), 杨边疆², 陆恒昌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 314100
3 陕钢集团产业创新研究院有限公司汉中 723000

Localized Corrosion Behavior Induced by MnS Inclusions in HRB400E Rebar Steel

HAN Yulong¹^,², LI Jian³, GUO Liya¹^,²(

), YANG Bianjiang², LU Hengchang¹^,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 314100, China
3 Shaanxi Steel Group lndustrial Innovation Research Institute Co., Ltd., Hanzhong 723000, China

引用本文:

韩宇龙, 李健, 郭丽雅, 杨边疆, 陆恒昌, 韦习成, 董瀚. 螺纹钢中MnS夹杂物诱发的局部腐蚀行为[J]. 中国腐蚀与防护学报, 2024, 44(5): 1255-1262.
Yulong HAN, Jian LI, Liya GUO, Bianjiang YANG, Hengchang LU, Xicheng WEI, Han DONG. Localized Corrosion Behavior Induced by MnS Inclusions in HRB400E Rebar Steel[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(5): 1255-1262.

全文: PDF(20112 KB) HTML

摘要:

采用全自动夹杂物分析仪、浸泡实验和电子背散射衍射仪(EBSD)等手段研究了HRB400E螺纹钢中不同尺寸MnS夹杂物在Cl^-环境中诱发局部腐蚀行为。原位浸泡结果表明：MnS夹杂物尺寸越大，越容易诱发局部腐蚀行为。EBSD结果表明：尺寸大于40 μm²的夹杂物容易引发腐蚀，和周围有较多的小角度晶界和较高的位错密度有关。同时，团簇大尺寸夹杂物共同诱发局部腐蚀形成的蚀坑面积大于单一夹杂物诱发的蚀坑。

关键词 ： MnS, 尺寸, 螺纹钢, 局部腐蚀

Abstract：

The effect of MnS inclusions with different sizes on the corrosion behavior of HRB400E rebar steel in 2%NaCl solution was investigated by means of automatic inclusion analyzer, immersion tests and Electron Backscattered Diffraction. The in-situ immersion test results showed that the localized corrosion was more easily induced by the relatively larger MnS inclusions than the smaller ones. The EBSD results suggested that corrosion was more likely initiated by inclusions with size above 40 μm², and this may be related to the presence of more low-angle grain boundaries and higher dislocation densities around them. Meanwhile, compared with the pit induced by a single inclusion, the width of pits initiated by clusters of large-size inclusions were greater.

Key words： MnS size rebars localized corrosion

收稿日期: 2023-10-24 32134.14.1005.4537.2023.337

ZTFLH:

TG174

基金资助:国家自然科学基金(42276214, 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机理研究

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

作者简介: 韩宇龙，男，1998年生，硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2023.337 或 https://www.jcscp.org/CN/Y2024/V44/I5/1255

图1 样品中夹杂物的OM图像和MnS夹杂物的尺寸分布

图2 尺寸分布在0~5、5~10、10~20和20~40 μm2的MnS夹杂物浸泡60 min前后的SEM-EDS图

图3 尺寸约为60.5 μm2的MnS夹杂物浸泡60 min时SEM-EDS图

图4 团簇与单一夹杂物浸泡60 min后的SEM图和3D轮廓图

图5 大小尺寸MnS夹杂物的平均取向差图和大小角度晶界图

图6 不同尺寸MnS夹杂物在Cl-环境下的腐蚀机理图

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