水溶性缓蚀剂对建筑管道用<strong>Q235</strong>钢腐蚀行为的影响

doi:10.11902/1005.4537.2022.372

中国腐蚀与防护学报

2023, Vol. 43

Issue (5): 1041-1048 CSTR: 32134.14.1005.4537.2022.372 DOI: 10.11902/1005.4537.2022.372

研究报告

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水溶性缓蚀剂对建筑管道用Q235钢腐蚀行为的影响

何静¹(

), 于航², 傅梓瑛¹, 岳鹏辉³

^1.东北大学基建管理处沈阳 110819
^2.哈尔滨工程大学材料科学与化学工程学院哈尔滨 150001
^3.东北大学材料科学与工程学院沈阳 110819

Effect of Water-soluble Corrosion Inhibitor on Corrosion Behavior of Q235 Pipeline Steel for Construction

HE Jing¹(

), YU Hang², FU Ziying¹, YUE Penghui³

^1.Infrastructure Management Office, Northeastern University, Shenyang 110819, China
^2.School of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
^3.School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

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摘要:

采用失重实验、动电位极化曲线、电化学阻抗谱、丝束电极 (WBE) 测试技术研究了水溶性缓蚀剂对建筑管道Q235钢腐蚀行为的影响。结果表明，水溶性缓蚀剂能够有效地缓解沉积物下Q235钢的腐蚀行为，随着缓蚀剂浓度提高，缓蚀剂成膜完整，基体耐腐蚀性能逐渐增强，在添加25 mg/L水溶性缓蚀剂时缓蚀率最大，Q235钢的自腐蚀电流下降了两个数量级。并且水溶性缓蚀剂还能降低沉积物覆盖区域的电偶电流。因此，定期对建筑管道中加注25 mg/L的水溶性缓蚀剂可以有效抑制Q235钢的腐蚀，即使在沉积物覆盖条件下也起到了很好的效果，能够显著提高建筑管道的质量和延长建筑使用寿命。

关键词 ：水溶性缓蚀剂, 建筑管道, Q235钢, 腐蚀行为

Abstract：

The effect of water-soluble corrosion inhibitor on the corrosion behavior of pipeline Q235 steel beneath artificial sediments in a liquid of simulated building pipeline sewage was assessed by means of mass-loss measurement, potentiodynamic polarization curve measurement, electrochemical impedance spectroscopy and wire beam electrode (WBE) technique. The results show that the water-soluble corrosion inhibitor IMC-80-N-4 can effectively alleviate the corrosion of Q235 steel in the test environment. With the increasing concentration of the corrosion inhibitor, the inhibitor film formed and became compact gradually on the steel surface. The corrosion inhibition effect of 25 mg/L water-soluble corrosion inhibitor is the best, which reduces the free-corrosion current density of the steel substrate by two orders of magnitude. Moreover, the galvanic current in the area covered with sediments was also reduced. Therefore, regular injection of 25 mg/L water-soluble corrosion inhibitor in the construction pipeline can effectively inhibit the corrosion of Q235 steel, besides, the inhibitor exhibits a good effect even under the condition of sediment coverage. That can significantly improve the safe operation of the construction pipeline, so that increase and extend the service life of the building.

Key words： water soluble corrosion inhibitor construction pipeline Q235 steel corrosion behavior

收稿日期: 2022-11-28 32134.14.1005.4537.2022.372

ZTFLH:

TG172

基金资助:兴辽英才计划(XLYC2002071);环境友好材料应用教育部重点实验室项目 (吉林师范大学)(2020011)

通讯作者: 何静，E-mail: 470010175@qq.com，研究方向为工程管理、建筑材料腐蚀防护研究

Corresponding author: HE Jing, E-mail: 470010175@qq.com

作者简介: 何静，女，1982年生，硕士

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引用本文:

何静, 于航, 傅梓瑛, 岳鹏辉. 水溶性缓蚀剂对建筑管道用Q235钢腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2023, 43(5): 1041-1048.
HE Jing, YU Hang, FU Ziying, YUE Penghui. Effect of Water-soluble Corrosion Inhibitor on Corrosion Behavior of Q235 Pipeline Steel for Construction. Journal of Chinese Society for Corrosion and protection, 2023, 43(5): 1041-1048.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.372 或 https://www.jcscp.org/CN/Y2023/V43/I5/1041

图1 不同浓度水溶性缓蚀剂条件下沉积物覆盖Q235钢的动电位极化曲线

表1 不同浓度水溶性缓蚀剂条件下样品的自腐蚀电位、自腐蚀电流以及缓蚀效率

图2 不同浓度水溶性缓蚀剂条件下，沉积物覆盖的Q235钢随时间变化的电化学阻抗谱

图3 用于拟合图2中电化学阻抗谱的等效电路

图4 添加不同浓度缓蚀剂后，沉积物覆盖Q235钢在浸泡6 d内的腐蚀产物电阻和电荷转移电阻

图5 未添加缓蚀剂时，沉积物覆盖下Q235钢的电位与电流分布

图6 添加8 mg/L缓蚀剂时，沉积物覆盖下Q235钢的电位与电流分布

图7 添加15 mg/L缓蚀剂时，沉积物覆盖下Q235钢的电位与电流分布

图8 添加25 mg/L缓蚀剂时，沉积物覆盖下Q235钢的电位与电流分布

图9 浸泡168 h后沉积物覆盖下Q235钢的宏观腐蚀形貌

图10 浸泡168 h后沉积物覆盖下Q235钢的显微腐蚀形貌

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