AZ31镁合金超疏水涂层制备及耐腐蚀性能研究

罗仲龙, 朱莉, 张鹏, 饶思贤

doi:10.16577/j.issn.1001-1560.2024.0266

材料保护 >

2024 , Vol. 57 >Issue 12: 17 - 26

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0266

研究篇

AZ31镁合金超疏水涂层制备及耐腐蚀性能研究

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安徽工业大学机械工程学院

罗仲龙(1987－)，博士，副教授，主要研究方向为精密机械传动、材料表面的摩擦机理及其微观力学性能，电话:13919092372，E-mail:luozlsci＠ahut.edu.cn

收稿日期: 2024-04-25

修回日期: 2024-07-09

录用日期: 2024-07-16

网络出版日期: 2025-01-14

基金资助

国家自然科学基金青年项目(21803003)；安徽省自然科学基金资助项目(1908085ME148)

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Preparation and Corrosion Resistance of Superhydrophobic Coating on AZ31 Magnesium Alloy

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(School of Mechanical Engineering， Anhui University of Technology， Ma’ anshan 243002， China)

LUO Zhonglong(1987－)， Ph.D.， Associate Professor， Research Focus: Precision Mechanical Transmission，Friction Mechanism and Micro Mechanical Properties of Material Surface， Tel.: 13919092372， E - mail:luozlsci＠ahut.edu.cn

Received date: 2024-04-25

Revised date: 2024-07-09

Accepted date: 2024-07-16

Online published: 2025-01-14

Supported by

National Natural Science Foundation of China (21803003)； Anhui Provincial Natural Science Foundation (1908085ME148)

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摘要

AZ31 镁合金性质活泼、表面易氧化且不耐腐蚀等情况一直是其在实际应用过程中面临的最大挑战，为提高其耐腐蚀性能，降低其腐蚀速率并延长使用寿命，采用浸渍法在AZ31 镁合金表面制备出稳定且耐腐蚀的磷酸氢二铝/聚甲基丙烯酸甲酯(AP/PMMA)超疏水涂层，并用扫描电子显微镜(SEM)、X 射线能量色散谱仪(EDS)、X射线衍射仪(XRD)和傅里叶红外光谱仪(FTIR)分析涂层的微观形貌、化学组成、相组成和分子结构，利用接触角测量仪、Tafel 曲线和EIS 测试其疏水性和耐腐蚀性。结果表明:随着浸渍时间的延长，涂层的水接触角(WCA)呈先增大后减小的趋势，其中浸渍时间为60 s 制备的涂层表面接触角可达154.7°，呈现出超疏水性，表面腐蚀电流密度为2.289×10－9 A/cm2，较镁基体下降4 个数量级，腐蚀电位从抛光后的镁合金基体的－0.941 V 提高到－0.735 V，说明AP/PMMA 超疏水涂层能有效提高AZ31 镁合金的耐腐蚀性能。

关键词： AZ31 镁合金; 超疏水涂层; 腐蚀行为; 浸渍法

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罗仲龙, 朱莉, 张鹏, 饶思贤 . AZ31镁合金超疏水涂层制备及耐腐蚀性能研究[J]. 材料保护, 2024 , 57(12) : 17 -26 . DOI: 10.16577/j.issn.1001-1560.2024.0266

Abstract

The active properties，easy oxidation and poor corrosion resistance of AZ31 magnesium alloy have always been the biggest challenges in its practical application.In order to improve its corrosion resistance， reduce the corrosion rate and prolong its service life， a stable and corrosion-resistant aluminum phosphate-polymethyl methacrylate (AP/PMMA) superhydrophobic coating was prepared on the surface by impregnation method.The microstructure， chemical composition， phase composition and molecular structure of the coating were analyzed by scanning electron microscope (SEM)，X-ray energy dispersive spectrometer (EDS)，X-ray diffractometer (XRD) and Fourier transform infrared spectrometer (FTIR).Moreover， the hydrophobicity and corrosion resistance were tested by contact angle meter (CA)， Tafel curve and EIS.Results showed that with the increase of immersion time， the contact angle (WCA) of the coating increased first and then decreased.The surface contact angle of the coating prepared by the 60 s immersion sample could reach 154.7 °， showing superhydrophobicity.The surface corrosion current density was 2.289 × 10－9 A/cm2， which was 4 orders of magnitude lower than that of the magnesium substrate.The corrosion potential was increased from－0.941 V to－0.735 V after polishing， indicating that the AP/PMMA superhydrophobic coating could effectively improve the corrosion resistance of AZ31 magnesium alloy.

Key words： AZ31 magnesium alloy; superhydrophobic coating; corrosion behavior; soaking method

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