Q690贝氏体桥梁钢焊接接头在模拟乡村大气中耐蚀性能研究

doi:10.11902/1005.4537.2021.258

中国腐蚀与防护学报

2022, Vol. 42

Issue (5): 826-832 DOI: 10.11902/1005.4537.2021.258

海洋材料腐蚀与防护专栏

本期目录 | 过刊浏览

Q690贝氏体桥梁钢焊接接头在模拟乡村大气中耐蚀性能研究

王昕煜, 黄峰(

), 刘海霞, 袁玮, 刘静

武汉科技大学省部共建耐火材料与冶金国家重点实验室湖北省海洋工程材料及服役安全工程技术研究中心武汉 430081

Corrosion Resistance of Welded Joints of Q690 Bainite Bridge Steel in Simulated Rural Atmosphere

WANG Xinyu, HUANG Feng(

), LIU Haixia, YUAN Wei, LIU Jing

Hubei Engineering Technology Research Center of Marine Materials and Service Safety, State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China

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摘要:

采用干、湿周期浸润法、电化学方法,结合X射线衍射仪 (XRD)、场发射原子探针显微镜 (FE-EPMA) 等现代表面分析技术,研究了Q690贝氏体桥梁钢及其焊接接头在模拟乡村大气环境中的腐蚀动力学规律及机理。结果表明,在整个腐蚀周期内,Q690钢及其焊接接头腐蚀动力学过程可以分为两个阶段,即n>1的加速腐蚀阶段和n<1的减速腐蚀阶段。腐蚀前期,因Q690钢焊接接头母材、热影响区和焊缝区存在明显显微组织差异,形成了以焊缝、热影响区为阳极、母材为阴极的电偶腐蚀对,导致其耐蚀性比母材要差；腐蚀后期,稳定锈层的形成缩小了Q690钢及焊接接头之间的耐蚀性差异。

关键词 ： 690, MPa级贝氏体钢, 焊接接头, 乡村大气, 周期浸润腐蚀, 极化曲线

Abstract：

The corrosion behavior of Q690 bainitic bridge steel and its welded joints in a simulated rural atmospheric environment were studied via cyclically wetting and drying method, electrochemical testing, X-ray diffraction (XRD), field emission electron probe micro analysis (FE-EPMA) and other modern surface analysis techniques. The results showed that the corrosion processes of Q690 steel and its welded joint may be differentiated as two stages, namely, the accelerated corrosion stage with n>1 and the deceleration corrosion stage with n<1. In the early stage of corrosion, owing to the obvious microstructure differences among BM (base metal), HAZ (heat affected zone) and WZ (weld zone) of Q690 steel welded joint, galvanic corrosion could emerge, i.e., WZ and HAZ act as anode and BM as cathode, resulting in worse corrosion resistance of the former two, in the contrast to BM. In the later stage of corrosion, as the stable rust layer formed, the difference in corrosion resistance between Q690 steel and welded joints was reduced.

Key words： 690 MPa grade bainite steel welded joints rural atmosphere periodic infiltrationcorrosion polarization curve

收稿日期: 2021-09-24

ZTFLH:

TG174

基金资助:湖北省自然科学基金创新群体(2021CFA023)

通讯作者: 黄峰 E-mail: huangfeng@wust.edu.cn

Corresponding author: HUANG Feng E-mail: huangfeng@wust.edu.cn

作者简介: 王昕煜,男,1998年生,硕士生

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引用本文:

王昕煜, 黄峰, 刘海霞, 袁玮, 刘静. Q690贝氏体桥梁钢焊接接头在模拟乡村大气中耐蚀性能研究[J]. 中国腐蚀与防护学报, 2022, 42(5): 826-832.
Xinyu WANG, Feng HUANG, Haixia LIU, Wei YUAN, Jing LIU. Corrosion Resistance of Welded Joints of Q690 Bainite Bridge Steel in Simulated Rural Atmosphere. Journal of Chinese Society for Corrosion and protection, 2022, 42(5): 826-832.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.258 或 https://www.jcscp.org/CN/Y2022/V42/I5/826

图1 焊接接头截面示意图

图2 Q690焊接接头各区域显微组织

图3 Q690钢及其焊接接头平均腐蚀速率随时间变化

图4 在不同周浸时间后Q690钢及其焊接接头试样表面宏观形貌

图5 Q690钢及焊接接头768 h锈层截面形貌及元素分布

图6 Q690钢及焊接接头周浸768 h后腐蚀产物XRD图谱

图7 Q690焊接接头不同区域开路电位随时间变化

图8 Q690焊接接头动电位极化曲线

表1 动电位极化参数表

图9 Q690焊接接头线性极化曲线

图10 Q690焊接接头各区域电化学阻抗谱及等效电路

图11 Q690钢及焊接接头腐蚀深度-时间双对数曲线

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