模拟海洋大气环境中镀锌钢的腐蚀行为和机理

doi:10.11902/1005.4537.2022.151

中国腐蚀与防护学报

2023, Vol. 43

Issue (3): 578-586 CSTR: 32134.14.1005.4537.2022.151 DOI: 10.11902/1005.4537.2022.151

研究报告

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模拟海洋大气环境中镀锌钢的腐蚀行为和机理

王瑾¹, 宁培栋¹, 刘倩倩², 陈娜娜², 张新³, 肖葵²(

)

^1.酒钢宏兴股份有限公司钢铁研究院嘉峪关 735100
^2.北京科技大学新材料技术研究院北京 100083
^3.北京科大分析检验中心有限公司北京 100083

Corrosion Behavior of Galvanized Steel in a Simulated Marine Atmospheric Environment

WANG Jin¹, NING Peidong¹, LIU Qianqian², CHEN Nana², ZHANG Xin³, XIAO Kui²(

)

^1.Research Institute, JISCO Hongxing Iron and Steel Co. Ltd., Jiayuguan 735100, China
^2.Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
^3.Testing Center of University of Science and Technology Beijing Co. Ltd., Beijing 100083, China

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摘要:

采用失重法、扫描电子显微镜 (SEM)、能谱仪 (EDS)、X射线衍射 (XRD)、X射线光电子能谱 (XPS)、电化学阻抗谱 (EIS) 和3D共聚焦显微镜表征镀锌钢在模拟海洋大气环境中不同实验周期下的腐蚀行为。结果表明：试样在实验初期腐蚀速率较高，56 d时速率下降，104 d时，腐蚀速率再次升高，这与腐蚀产物的生成有关。通过对产物进行物相分析，主要的腐蚀产物有羟基氯化锌 (Zn₅(OH)₈Cl₂·H₂O)、氧化锌 (ZnO) 和碱式碳酸锌 (Zn₅(OH)₆(CO₃)₂)。在模拟海洋大气环境中，热浸镀锌层的耐蚀性很快失效，腐蚀速率加快直至生成的腐蚀产物在缺陷处形成较为完整的产物膜，这对镀层的腐蚀具有一定的抑制作用。

关键词 ：热浸镀锌钢, 海洋大气环境, 室内加速实验, 腐蚀机制

Abstract：

The corrosion behavior of hot-dip galvanized steel after various test cycles in simulate marine atmospheric environment was assessed by mass loss method, 3D confocal microscope, electrochemical impedance spectroscope (EIS), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), X-ray diffractometer (XRD) and X-ray photoelectron spectroscope (XPS). The results show that the corrosion rate of the steel samples was higher at the beginning of the experiment, then decreased at 56 d, and increased again at 104 d, which might be related to the formation of corrosion products. After being tested for 56 d, the steel suffered form mainly uniform corrosion, the main corrosion products were hydroxyzinc chloride (Zn₅(OH)₈Cl₂·H₂O), zinc oxide (ZnO) and basic zinc carbonate (Zn₅(OH)₆(CO₃)₂). In the simulated marine atmospheric environment, the corrosion resistance of the hot-dip galvanized coating failed quickly. Whilst, the corrosion rate has been accelerating until the formation of a relatively complete corrosion product film on the existed damaged areas, hence, the corrosion product film has a certain inhibitory effect on the corrosion of the coating.

Key words： hot-dip galvanized steel marine atmospheric environment indoor acceleration test corrosion mechanism

收稿日期: 2022-05-14 32134.14.1005.4537.2022.151

ZTFLH:

TG174

基金资助:国家材料腐蚀与防护数据科学中心

通讯作者: 肖葵，E-mail：xiaokui@ustb.edu.cn，研究方向为材料腐蚀与防护

Corresponding author: XIAO Kui, E-mail: xiaokui@ustb.edu.cn

作者简介: 王瑾，女，1971年生，正高级工程师

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引用本文:

王瑾, 宁培栋, 刘倩倩, 陈娜娜, 张新, 肖葵. 模拟海洋大气环境中镀锌钢的腐蚀行为和机理[J]. 中国腐蚀与防护学报, 2023, 43(3): 578-586.
WANG Jin, NING Peidong, LIU Qianqian, CHEN Nana, ZHANG Xin, XIAO Kui. Corrosion Behavior of Galvanized Steel in a Simulated Marine Atmospheric Environment. Journal of Chinese Society for Corrosion and protection, 2023, 43(3): 578-586.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.151 或 https://www.jcscp.org/CN/Y2023/V43/I3/578

表1 GI板在模拟海洋大气实验下的腐蚀失重数据

图1 模拟海洋大气环境中GI板的腐蚀动力学相关曲线

图2 GI板在模拟海洋大气环境加速腐蚀实验不同周期后的XRD谱

图3 GI板在模拟海洋大气环境加速腐蚀试验不同周期后的XPS谱

图4 GI板在模拟海洋大气环境加速腐蚀实验不同周期后的宏观腐蚀形貌

图5 模拟海洋大气不同实验周期GI板除锈后的3D共聚焦形貌

图6 模拟海洋大气不同实验周期后GI板的腐蚀形貌

表2 模拟海洋大气不同实验周期后GI板的EDS结果

图7 模拟海洋大气不同实验周期后GI镀层截面的背散射形貌及面扫照片

图8 不同实验周期后的GI板在酸性 (1±0.1) g/L NaHSO3溶液中的电化学阻抗谱

图9 GI板在酸性 (50±5) g/L NaCl溶液中的等效电路

表3 GI板在酸性 (50±5) g/L NaCl溶液中的等效电路元件拟合值

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