除冰盐环境下桥梁钢的耐腐蚀性能研究

doi:10.11902/1005.4537.2019.281

中国腐蚀与防护学报

2020, Vol. 40

Issue (5): 448-454 DOI: 10.11902/1005.4537.2019.281

海洋材料腐蚀与防护专辑

本期目录 | 过刊浏览

除冰盐环境下桥梁钢的耐腐蚀性能研究

李琳¹^,²(

), 陈义庆¹^,², 高鹏¹^,², 艾芳芳¹^,², 钟彬¹^,², 伞宏宇¹^,², 杨颖²

1 海洋装备用金属材料及其应用国家重点实验室鞍山 114009
2 鞍钢集团钢铁研究院鞍山 114009

Corrosion Resistance of Various Bridge Steels in Deicing Salt Environments

LI Lin¹^,²(

), CHEN Yiqing¹^,², GAO Peng¹^,², AI Fangfang¹^,², ZHONG Bin¹^,², SAN Hongyu¹^,², YANG Ying²

1 State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan 114009, China
2 Iron & Steel Research Institute of ANGANG Group, Anshan 114009, China

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摘要:

采用干湿交替腐蚀实验和全浸腐蚀实验结合锈层物相分析，研究了桥梁钢Q345qENH、Q420qENH和对比钢种Q345qE在除冰盐环境下的腐蚀行为。结果表明：耐候桥梁钢Q345qENH、Q420qENH在除冰盐腐蚀环境的耐蚀能力明显优于Q345qE钢；同种桥梁钢在不同的结构部位受除冰盐腐蚀程度相差较大，Q345qENH、Q420qENH和Q345qE钢干湿交替腐蚀的加速倍率分别是其全浸腐蚀的26.88倍、27.5倍和33.75倍；干湿交替腐蚀实验随着时间的延长锈层物相结构及含量均有所变化，绝缘的非活性物质α-FeOOH相的增加是导致实验后期腐蚀速率下降的重要原因。

关键词 ：桥梁钢, 除冰盐, 干湿交替, 全浸, 腐蚀行为

Abstract：

The corrosion behavior of bridge steels Q345qENH and Q420qENH in deicing salt was studied by means of wet-dry cyclic corrosion test, immersion corrosion test and rust scale characterization, while taking Q345qE steel as comparison. The results indicate that the corrosion resistance of the Q345qENH and Q420qENH weathering bridge steels was better than that of the Q345qE steel. The dry-wet cyclic corrosion test results reveal that the Q345qENH, Q420qENH and Q345qE steels show corrosion rates of 26.88, 27.5, and 33.75 times higher than those measured in immersion corrosion test, respectively. During dry-wet cyclic corrosion test, the structure and composition of the formed rust scales changed and the amount of α-FeOOH phase increased gradually with time, which may be an important reason leading to the decrease of corrosion rate at the end of dry-wet cyclic test.

Key words： bridge steel deicing salt dry-wet cyclic immersion corrosion behavior

收稿日期: 2019-12-31

ZTFLH:

TG172

基金资助:国家重点研发计划(2017YFB0304800)

通讯作者: 李琳 E-mail: ansteellilin@163.com

Corresponding author: LI Lin E-mail: ansteellilin@163.com

作者简介: 李琳

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引用本文:

李琳, 陈义庆, 高鹏, 艾芳芳, 钟彬, 伞宏宇, 杨颖. 除冰盐环境下桥梁钢的耐腐蚀性能研究[J]. 中国腐蚀与防护学报, 2020, 40(5): 448-454.
Lin LI, Yiqing CHEN, Peng GAO, Fangfang AI, Bin ZHONG, Hongyu SAN, Ying YANG. Corrosion Resistance of Various Bridge Steels in Deicing Salt Environments. Journal of Chinese Society for Corrosion and protection, 2020, 40(5): 448-454.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.281 或 https://www.jcscp.org/CN/Y2020/V40/I5/448

表1 实验钢的化学成分 (mass fraction / %)

图1 除冰盐干湿交替实验的腐蚀形貌

图2 3种试样干湿交替32 d后的SEM形貌

图3 干湿交替实验3种桥梁钢的腐蚀减薄量

图4 3种桥梁钢干湿交替实验腐蚀减薄量拟合曲线

表2 干湿交替实验回归方程

图5 除冰盐全浸实验8 d腐蚀形貌

图6 全浸实验3种桥梁钢的腐蚀减薄量

图7 3种桥梁钢全浸实验腐蚀减薄量拟合曲线

表3 全浸实验回归方程

图8 干湿交替腐蚀产物XRD谱

表4 干湿交替腐蚀产物物相组成 (mass fraction / %)

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