桥梁钢Q345q在3种模拟大气环境中的腐蚀行为研究

doi:10.11902/1005.4537.2018.127

中国腐蚀与防护学报

2019, Vol. 39

Issue (4): 319-330 DOI: 10.11902/1005.4537.2018.127

研究报告

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桥梁钢Q345q在3种模拟大气环境中的腐蚀行为研究

郭铁明¹(

),张延文¹,秦俊山²,宋志涛¹,董建军²,杨新龙²,南雪丽¹

1. 兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室兰州 730050
2. 甘肃酒泉集团宏兴钢铁股份有限公司嘉峪关 735100

Corrosion Behavior of Q345q Bridge Steel in Three Simulated Atmospheres

GUO Tieming¹(

),ZHANG Yanwen¹,QIN Junshan²,SONG Zhitao¹,DONG Jianjun²

1. YANG Xinlong2, NAN Xueli1
2. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China

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摘要:

选择3种模拟西北地区大气环境的腐蚀介质 (除冰盐介质、工业大气介质及除冰盐+工业大气介质)，采用干湿交替加速腐蚀实验研究了桥梁钢Q345q的腐蚀行为，通过失重法探讨了桥梁钢Q345q在3种不同腐蚀环境下的腐蚀动力学曲线，并采用XRD、SEM和电化学工作站等分析了桥梁钢Q345q腐蚀不同时间形成的锈层物相、形貌、结构及其电化学特性。结果表明：虽然在除冰盐介质中480 h内腐蚀速率小，但表面形成含有β-FeOOH和氯化物等不稳定可溶性的腐蚀产物，导致锈层疏松，腐蚀电流增大，锈层不具保护性；在NaHSO₃介质中的腐蚀速率较高，但随着腐蚀时间的延长锈层致密性增加，腐蚀速率下降较快，锈层阳极稳态腐蚀电流减小，锈层具有保护性；而在混合介质中腐蚀行为为耦合效应，由于氯化物等腐蚀产物使得锈层致密性下降，但锈层仍具有一定的保护性。

关键词 ：桥梁钢Q345q, 除冰盐, NaHSO₃介质, 混合介质, 腐蚀行为

Abstract：

Corrosion behavior of Q345q bridge steel was studied by dry-wet alternating accelerated corrosion test method with three designed media, which aim to simulate three environmental conditions commonly encountered in the Northwest China, namely deicing-, industrial- and industrial with deicing-conditions respectively. While the corrosion kinetics curves of Q345q bridge steel were measured by weight loss method. The morphology, microstructure and phase composition, as well as the electrochemical properties of the rust scales of Q345q bridge steel corroded for different time were assessed by means of SEM, XRD and electrochemical workstation. Results show that although the corrosion rate is small in the deicing salt medium within 480 h, the corrosion product contains unstable and soluble compounds such as β-FeOOH and chloride, which results in loose rust scale, the corrosion current of the rust scale increases with time, thus which is poor in protectiveness. The corrosion rate in the sodium bisulfite medium is higher, but with the increase of corrosion time, the corrosion rate decreases rapidly, the anode corrosion current of the rust scale decreases, therewith, the rust scale is protective. In the mixed medium, the corrosion behavior is a coupling effect. Due to the existence of corrosion products such as chlorides, the compactness of the rust scale is poor, but which exhibits protectiveness to a certain degree in comparison with that in the deicing salt medium.

Key words： bridge steel Q345q deicing salt NaHSO₃ medium mixed medium corrosion behavior

收稿日期: 2018-09-05

ZTFLH:

TG172.3

基金资助:国家自然科学基金(51461029);广东省“扬帆计划”引进创新创业团队专项资助 (2015YT02G090) 和甘肃省交通厅科研项目(2015YT02G090);甘肃省交通厅科研项目(2017-16 and 2017-19)

通讯作者: 郭铁明 E-mail: guotm@lut.cn

Corresponding author: Tieming GUO E-mail: guotm@lut.cn

作者简介: 郭铁明，女，1969年生，教授

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引用本文:

郭铁明,张延文,秦俊山,宋志涛,董建军,杨新龙,南雪丽. 桥梁钢Q345q在3种模拟大气环境中的腐蚀行为研究[J]. 中国腐蚀与防护学报, 2019, 39(4): 319-330.
Tieming GUO, Yanwen ZHANG, Junshan QIN, Zhitao SONG, Jianjun DONG. Corrosion Behavior of Q345q Bridge Steel in Three Simulated Atmospheres. Journal of Chinese Society for Corrosion and protection, 2019, 39(4): 319-330.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2018.127 或 https://www.jcscp.org/CN/Y2019/V39/I4/319

表1 3种模拟大气环境的腐蚀介质成分

图1 Q345q钢在3种腐蚀介质下的腐蚀动力学曲线

表2 双对数线性拟合结果

图2 桥梁钢Q345q在干湿循环不同时间后腐蚀产物的XRD谱

图3 Q345q钢在3种介质中腐蚀不同时间的锈层宏观形貌

图4 Q345q钢在除冰盐中腐蚀不同时间的微观形貌

图5 Q345q钢在NaHSO3溶液中腐蚀不同时间的微观形貌

图6 Q345q钢在混合溶液中腐蚀不同时间的微观形貌

图7 Q345q钢在3种介质中腐蚀不同时间的截面形貌

表3 Q345q钢在3种介质中腐蚀不同时间后锈层的平均厚度

图8 Q345q钢在3种介质中腐蚀不同时间的极化曲线

表4 带锈Q345q钢的极化曲线参数

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