AZ31镁合金基Cu-MOF-SA超疏水膜的制备及其耐腐蚀性能研究

王世颖, 康丰, 吴敏娴, 陈艳丽, 陈智栋

doi:10.16577/j.issn.1001-1560.2024.0018

材料保护 >

2024 , Vol. 57 >Issue 1: 148 - 155

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0018

工艺篇

AZ31镁合金基Cu-MOF-SA超疏水膜的制备及其耐腐蚀性能研究

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¹常州大学材料科学与工程学院； ²常州大学石油化工学院

陈智栋(1964-)，博士，教授，主要研究方向为材料表面处理，电话:0519-86330239，E-mail:zdchen＠cczu.edu.cn

收稿日期: 2023-03-27

修回日期: 2023-05-16

录用日期: 2023-06-10

网络出版日期: 2024-01-30

基金资助

国家自然科学基金(22378029)

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Study on Preparation and Corrosion Resistance of Cu-MOF-SA Superhydrophobic Films on AZ31 Magnesium Alloy

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(a.School of Materials Science and Engineering，b.School of Petrochemical Engineering，Changzhou University，Changzhou 213164，China)

CHEN Zhidong(1964-)，Ph.D.，Professor，Research Focus: Material Surface Treatment，Tel.: 0519-86330239，E-mail: zdchen＠cczu.edu.cn

Received date: 2023-03-27

Revised date: 2023-05-16

Accepted date: 2023-06-10

Online published: 2024-01-30

Supported by

National Science Foundation of China (22378029)

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摘要

腐蚀是影响镁及其合金大规模应用的关键技术难题之一，因可有效隔离金属基底与腐蚀介质的直接接触，从而降低腐蚀速率，制备超疏水表面成为提高镁合金耐蚀性的有效途径。通过一步电沉积方法，在AZ31 镁合金基底上成功制备了铜-金属有机骨架-硬脂酸(Cu-MOF-SA)超疏水膜，并对超疏水膜的耐腐蚀性、化学稳定性和耐热性进行了综合研究。结果表明，表面的水接触角可达158°，超疏水膜覆盖的试样在3.5%NaCl 溶液中表现出良好的耐腐蚀性能，相比AZ31 镁合金基底，其腐蚀电位正移了0.24 V，腐蚀电流密度降低了1 个数量级。在pH 值为1～14 的溶液中浸润24 h 后，超疏水膜的水接触角仍可达135°以上，浸泡在pH＝1 的溶液24 h 的超疏水膜的腐蚀电位比AZ31 镁合金基底高0.21 V。在20～90 ℃空气中保温24 h 后，超疏水膜的水接触角仍保持在154°以上，80 ℃下保温24 h 后其腐蚀电位比AZ31 镁合金基底的高0.22 V，腐蚀电流密度比AZ31 镁合金基底的小1 个数量级。结果表明，本研究制备的Cu-MOF-SA 疏水膜具有良好的超疏水性和耐腐蚀性。

关键词： AZ31 镁合金; 一步电沉积法; Cu-MOF-SA 超疏水膜; 耐腐蚀性能; 化学稳定性; 耐热性

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王世颖, 康丰, 吴敏娴, 陈艳丽, 陈智栋 . AZ31镁合金基Cu-MOF-SA超疏水膜的制备及其耐腐蚀性能研究[J]. 材料保护, 2024 , 57(1) : 148 -155 . DOI: 10.16577/j.issn.1001-1560.2024.0018

Abstract

Corrosion is one of the key technical challenges affecting the large-scale application of magnesium and its alloys.Superhydrophobic surfaces are an effective way to improve the corrosion resistance of magnesium alloys，as they can effectively isolate direct contact between the metal substrate from the corrosive medium，thereby reducing the corrosion rate.A superhydrophobic film composed of Copper-Metal Organic Framework-Stearic Acid (Cu-MOF-SA) was successfully fabricated on an AZ31 magnesium alloy substrate using a one-step electrodeposition method.Comprehensive studies were conducted on the corrosion resistance，chemical stability and thermal stability of the superhydrophobic film.Results showed that the water contact angle of the superhydrophobic film surface reached up to 158°；the sample coated by superhydrophobic film exhibited good corrosion resistance in a 3.5%NaCl solution.Compared with the AZ31 magnesium substrate，the corrosion potential of the superhydrophobic film increased by 0.24 V，and the corrosion current density was reduced by one order of magnitude.The water contact angle of the superhydrophobic film remained larger than 135° after being immersed in solutions with a pH of 1～14 for 24 h.The corrosion potential of superhydrophobic film after being immersed in solution with a pH of 1 for 24 h was 0.21 V higher than that of the AZ31 magnesium substrate.After being insulated in air at 20 ～90 ℃for 24 h，the water contact angle of the Cu-MOF-SA superhydrophobic film’s surface remained above 154°.Additionally，after being insulated in air at 80 ℃for 24 h，the corrosion potential of the superhydrophobic film was 0.22 V higher than that of the AZ31 magnesium substrate.The corrosion current density of the superhydrophobic film was one order of magnitude smaller than that of AZ31 magnesium alloy substrate.In brief，the Cu-MOF-SA superhydrophobic film fabricated in this study demonstrated excellent superhydrophobicity and corrosion resistance.

Key words： AZ31 magnesium alloy; one-step electrodeposition method; Cu-MOF-SA superhydrophobic film; corrosion resistance; chemical stability; heat resistance

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