两种电弧喷涂涂层在中性盐雾环境下的耐蚀性能对比研究

doi:10.11902/1005.4537.2022.284

中国腐蚀与防护学报

2023, Vol. 43

Issue (5): 1003-1014 CSTR: 32134.14.1005.4537.2022.284 DOI: 10.11902/1005.4537.2022.284

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两种电弧喷涂涂层在中性盐雾环境下的耐蚀性能对比研究

肖文涛¹, 刘静¹(

), 彭晶晶¹, 张弦¹, 吴开明¹^,²(

)

^1.武汉科技大学高性能钢铁材料及其应用省部共建协同创新中心耐火材料与冶金省部共建国家重点实验室冶金工业过程系统科学湖北省重点实验室武汉 430081
^2.材谷金带 (佛山) 金属复合材料有限公司佛山 528000

Corrosion Resistance of Two Arc Spraying Coatings on EH36 Steel in Neutral Salt Spray Environment

XIAO Wentao¹, LIU Jing¹(

), PENG Jingjing¹, ZHANG Xian¹, WU Kaiming¹^,²(

)

^1.Collaborative Innovation Center for Advanced Steels, The State Key Laboratory of Refractory Material and Metallurgy, Hubei Province Key Laboratory of Systems Science in Metallurgical Process, Wuhan University of Science and Technology, Wuhan 430081, China
^2.Metals Valley & Band (Foshan) Metallic Composite Co. Ltd., Foshan 528000, China

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摘要:

采用电弧喷涂技术在EH36钢表面制备了5083铝合金涂层和Zn15Al涂层，结合扫描电子显微镜 (SEM)、X射线衍射仪 (XRD)、电化学测试和腐蚀失重等方法对比研究了两种涂层在中性盐雾环境下的耐蚀性能。结果表明，随着腐蚀的进行，两种涂层的腐蚀速率均逐渐下降，且5083Al合金涂层的腐蚀速率明显低于Zn15Al涂层。形貌观察结果表明，5083铝合金涂层的腐蚀产物呈致密块状，Cl^-无明显渗入；而Zn15Al涂层的腐蚀产物呈疏松的细针状，盐雾腐蚀10 d后有Cl^-沉积在腐蚀产物层中并逐渐渗入至涂层基体。5083铝合金涂层的腐蚀产物主要为Al(OH)₃，Zn15Al涂层腐蚀产物主要由Zn(OH)₂和Zn₅(OH)₈Cl₂·H₂O组成。结合溶度积常数K_sp和过饱和度的理论计算，Al(OH)₃沉积所需Al³⁺浓度更低、沉积速度更快，因此5083铝合金涂层更倾向于形成致密的腐蚀产物层。这一结果与电化学阻抗谱 (EIS) 测试结果相吻合，随腐蚀时间延长，两种涂层的极化电阻逐渐增大，且5083铝合金涂层的极化电阻高于Zn15Al涂层，说明腐蚀产物致密性是影响两种涂层耐蚀性能的主要原因。

关键词 ：电弧喷涂, 5083Al涂层, Zn15Al涂层, 盐雾腐蚀性能

Abstract：

The 5083 Al-alloy coating (5083 coating) and Zn15Al coating were prepared on the surface of EH36 steel by arc spraying technology, and the corrosion resistance of the two coatings in neutral salt spray environment was comparatively studied by means of mass loss method, electrochemical tests, SEM and XRD etc. The results show that, with the progress of corrosion, the corrosion rate of the two coatings gradually decreases, and the corrosion rate of 5083 Al-alloy coating is significantly lower than that of Zn15Al coating. The morphological observations show that the corrosion products of 5083 Al-alloy coatings are dense and blocky, and there is no obvious infiltration of Cl^-. However, the corrosion products of Zn15Al coatings are loose and fine needle-like, and Cl^- is deposited in the corrosion product layer after 10 d of salt spray corrosion and then gradually penetrates into the coating matrix. The corrosion products of 5083 Al-alloy coating are mainly Al(OH)₃, and those of Zn15Al coating composed mainly of Zn(OH)₂ and Zn₅(OH)₈Cl₂·H₂O. Taking the calculation results of the solubility product constant K_spand supersaturation into consideration, it follows that the deposition of Al(OH)₃ requires a lower Al³⁺ concentration and presents a faster deposition rate. Therefore, the 5083 coating is more inclined to form a dense layer of corrosion products. This result is verified by the EIS test results. As corrosion time prolongs, the polarization resistance of the two coatings gradually increases, and the polarization resistance of the 5083 Al-alloy coating is higher than that of the Zn15Al coating, indicating that the densification of corrosion products is the main reason affecting the corrosion resistance of the two coatings.

Key words： arc spray coating Al-alloy coating Zn15Al coating corrosion resistances of salt spray

收稿日期: 2022-09-14 32134.14.1005.4537.2022.284

ZTFLH:

TG174

基金资助:湖北省教育厅科学技术研究计划重点项目(D20221103);冶金工业过程系统科学湖北省重点实验室开放基金(Y202204)

通讯作者: 刘静，E-mail: liujing2015@wust.edu.cn，研究方向为金属材料深海腐蚀与防护；吴开明，E-mail: wukaiming@wust.edu.cn，研究方向为高强钢铁材料及其防护

Corresponding author: LIU Jing, E-mail: liujing2015@wust.edu.cn;WU Kaiming, E-mail: wukaiming@wust.edu.cn

作者简介: 肖文涛，男，1998年生，硕士生

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引用本文:

肖文涛, 刘静, 彭晶晶, 张弦, 吴开明. 两种电弧喷涂涂层在中性盐雾环境下的耐蚀性能对比研究[J]. 中国腐蚀与防护学报, 2023, 43(5): 1003-1014.
XIAO Wentao, LIU Jing, PENG Jingjing, ZHANG Xian, WU Kaiming. Corrosion Resistance of Two Arc Spraying Coatings on EH36 Steel in Neutral Salt Spray Environment. Journal of Chinese Society for Corrosion and protection, 2023, 43(5): 1003-1014.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.284 或 https://www.jcscp.org/CN/Y2023/V43/I5/1003

表1 丝材化学成分 (mass fraction / %)

表2 5083铝合金和Zn15Al涂层物理性能

图1 中性盐雾环境下两种涂层的腐蚀速率

图2 5083铝合金和Zn15Al涂层在中性盐雾环境下的表面宏观腐蚀形貌

图3 中性盐雾环境下5083铝合金和Zn15Al涂层表面微观腐蚀形貌

图4 中性盐雾环境下5083铝合金涂层截面微观腐蚀形貌

图5 中性盐雾环境下Zn15Al涂层截面形貌

表3 中性盐雾环境下腐蚀产物层厚度

图6 中性盐雾环境下腐蚀100 d后两种涂层的XRD谱

图7 5083铝合金涂层电化学阻抗谱及等效电路

图8 Zn15Al涂层电化学阻抗谱及拟合电路

表4 5083铝合金涂层EIS拟合结果

表5 Zn15Al涂层EIS拟合结果

图9 中性盐雾环境下两种涂层的极化电阻对比

图10 Al(OH)3和Zn(OH)2的过饱和度

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