铝合金超疏水涂层浸涂法制备及其耐蚀性能

李永富, 张永君, 沈先龙, 周池楼

doi:10.16577/j.issn.1001-1560.2022.0306

材料保护 >

2022 , Vol. 55 >Issue 11: 44 - 49

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0306

试验研究

铝合金超疏水涂层浸涂法制备及其耐蚀性能

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¹中车大连机车研究所有限公司； ²华南理工大学机械与汽车工程学院

张永君(1973-)，副教授，主要研究方向为腐蚀防护与表面工程材料和技术，E - mail：zhangyj@scut.edu.cn

收稿日期: 2022-05-27

修回日期: 2022-06-28

录用日期: 2022-07-20

网络出版日期: 2023-12-25

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Preparation of Superhydrophobic Coating on Aluminum Alloy by Dip - Coating Method and Its Corrosion Resistance

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(1. CRRC Dalian Locomotive Research Co., Ltd., Dalian 116021, China;2. School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou 510641, China)

Received date: 2022-05-27

Revised date: 2022-06-28

Accepted date: 2022-07-20

Online published: 2023-12-25

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摘要

为了提高铝合金的耐腐蚀性能，通过浸涂法在6063铝合金表面制备超疏水涂层。借助扫描电子显微镜、能量色散谱仪和3D光学轮廓仪分析了涂层的微观形貌、成分和粗糙度；通过胶带测试评估涂层与基体之间的结合性能；采用电化学动电位扫描极化曲线和交流阻抗研究了涂层的腐蚀行为。结果表明：涂层具有微/纳结构，呈现超疏水特性，水接触角达到152.1°；超疏水涂层在3.5% NaCl溶液中具有优良的耐腐蚀性能，相对于基体，超疏水涂层试样自腐蚀电位正移了407 mV，腐蚀电流密度下降了3个数量级，低频阻抗模量提高近7个数量级，说明超疏水涂层能够有效提高6063铝合金的耐腐蚀性能。

关键词： 铝合金; 浸涂法; 氟碳涂层; 超疏水; 耐腐蚀性

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李永富, 张永君, 沈先龙, 周池楼 . 铝合金超疏水涂层浸涂法制备及其耐蚀性能[J]. 材料保护, 2022 , 55(11) : 44 -49 . DOI: 10.16577/j.issn.1001-1560.2022.0306

Abstract

For improving the corrosion resistance of aluminum alloy, a superhydrophobic coating was prepared on the surface of 6063 aluminum alloy by dip - coating method. The microscopic morphology, composition and roughness of the coating were analyzed by scanning electron microscope, energy dispersive spectrometer and 3D optical profiler. Meanwhile, the bonding performance of the coating to the substrate was evaluated by tape test, and the corrosion behavior of the coating was studied by electrochemical potentiodynamic scanning polarization curve and AC impedance spectroscopy. Results showed that the coating had a micro/nano structure and showed a superhydrophobic characteristic with a water contact angle up to 152.1°. The corrosion resistance of the coating was excellent in 3.5% NaCl solution. In comparison with the substrate, the corrosion potential of the coating shifted positively 407 mV, the corrosion current density decreased by three orders of magnitude, and the impedance modulus in the low - frequency region increased by seven orders of magnitude, indicating that the superhydrophobic coating could significantly improve the corrosion resistance of 6063 aluminum alloy.

Key words： aluminum alloy; dip - coating method; fluorocarbon coating; superhydrophobicity; corrosion resistance

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