Q690qE桥梁钢在模拟滨海工业环境中的腐蚀行为研究

doi:10.11902/1005.4537.2021.197

中国腐蚀与防护学报

2022, Vol. 42

Issue (4): 669-674 DOI: 10.11902/1005.4537.2021.197

研究报告

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Q690qE桥梁钢在模拟滨海工业环境中的腐蚀行为研究

范益¹, 杨文秀¹, 王军¹, 蔡佳兴¹, 马宏驰¹^,²(

)

^1.南京钢铁股份有限公司江苏省高端钢铁材料重点实验室南京 210035
^2.北京科技大学新材料技术研究院国家材料腐蚀与防护科学数据中心北京 100083

Corrosion Behavior of Q690qE Steel in a Simulated Coastal-industrial Environment

FAN Yi¹, YANG Wenxiu¹, WANG Jun¹, CAI Jiaxing¹, MA Hongchi¹^,²(

)

^1.Nanjing Iron & Steel United Co. Ltd., Nanjing 210035, China
^2.National Materials Corrosion and Protection Data Center, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China

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摘要:

采用周期浸润腐蚀实验方法,结合锈层形貌与成分分析、基体腐蚀形貌观察以及腐蚀速率分析,研究了Q690qE高强耐候桥梁钢在模拟滨海工业环境中的腐蚀行为与规律。结果表明,Q690qE钢在模拟滨海工业环境中易形成致密锈层,具有一定保护作用,但锈层中没有Ni、Cr等合金元素的富集,且锈层底部存在Cl^-的富集和FeSO₄的沉积,导致Q690qE钢存在较高的腐蚀速率,且基体表面出现明显的点蚀坑,通过幂指数拟合显示腐蚀深度与腐蚀时间呈现D=0.019·t^0.7的幂函数关系。

关键词 ： Q690qE桥梁钢, 滨海工业环境, 高强耐候钢, 大气腐蚀

Abstract：

Corrosion behavior of high-strength Q690qE bridge steel was investigated by means of immersion-drying cyclical corrosion test (CCT) method coupled with characterization of the morphology and composition of rust, cross sectional morphology of the corroded steels and corrosion depth measurement. The results revealed that a compact rust layer can easily form in this simulated humid coastal-industrial environment, and which presents certain protection ability for the steel substrate. However, there was no enrichment of Ni/Cr and other alloy elements in the rust. Besides, there was apparent concentration of Cl^- and FeSO₄ underneath the rust layer, which may contribute to the high corrosion rate and evident corrosion pits on the steel surface. The results of power exponent fitting display that the corrosion depth (mm) and time (d) exhibits a well power function of D=0.019·t^0.7.

Key words： Q690qE bridge steel coastal-industrial environment high-strength weathering steel atmospheric corrosion

收稿日期: 2021-08-13

ZTFLH:

TG172.3

基金资助:国家科技基础资源调查专项(2019FY101400);中央高校基本科研业务费(FRF-BD-20-26A)

通讯作者: 马宏驰 E-mail: mahongchi@ustb.edu.cn

Corresponding author: MA Hongchi E-mail: mahongchi@ustb.edu.cn

作者简介: 范益,男,1980年生,高级工程师

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引用本文:

范益, 杨文秀, 王军, 蔡佳兴, 马宏驰. Q690qE桥梁钢在模拟滨海工业环境中的腐蚀行为研究[J]. 中国腐蚀与防护学报, 2022, 42(4): 669-674.
Yi FAN, Wenxiu YANG, Jun WANG, Jiaxing CAI, Hongchi MA. Corrosion Behavior of Q690qE Steel in a Simulated Coastal-industrial Environment. Journal of Chinese Society for Corrosion and protection, 2022, 42(4): 669-674.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.197 或 https://www.jcscp.org/CN/Y2022/V42/I4/669

图1 Q690qE钢微观组织

图2 Q690qE钢试样原始和周浸不同时间后的锈层形貌

图3 Q690qE钢周浸不同时间后的锈层表面形貌

图4 Q690qE钢周浸不同时间后的锈层截面形貌

图5 Q690qE钢周浸不同时间后的锈层截面成分分布

图6 Q690qE钢周浸不同时间后的宏观形貌

图7 Q690qE钢周浸不同时间后的腐蚀形貌

图8 Q690qE钢周浸腐蚀深度随周浸时间的变化趋势

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