恒压恒流交互模式对AZ31B镁合金微弧氧化陶瓷膜组织与性能的影响

束银凤, 姜波, 王超, 宋仁国

doi:10.16577/j.issn.1001-1560.2024.0031

材料保护 >

2024 , Vol. 57 >Issue 2: 35 - 42

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0031

研究篇

恒压恒流交互模式对AZ31B镁合金微弧氧化陶瓷膜组织与性能的影响

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¹常州大学材料科学与工程学院； ²常州大学江苏省材料表面科学与技术重点实验室

宋仁国(1965-)，教授，博士生导师，博士，从事材料腐蚀与防护、表面工程、计算材料科学等研究，电话:0519-86330095，E-mail: songrg＠cczu.edu.cn

收稿日期: 2023-05-09

修回日期: 2023-06-18

录用日期: 2023-07-10

网络出版日期: 2024-03-08

基金资助

国家自然科学基金资助项目(51871031)

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Effect of Constant Voltage and Constant Current Interaction Mode on Microstructure and Properties of Micro-Arc Oxidation Ceramic Film on AZ31B Magnesium Alloy

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(a.School of Materials Science and Engineering，b.Jiangsu Key Laboratory of Materials Surface Science and Technology， Changzhou University， Changzhou 213164， China)

SONG Renguo (1965-)， Professor， Ph.D.Supervisor， Ph.D.， Research Focus: Materials Corrosion and Protection，Surface Engineering，Computational Materials Science，etc.，Tel.:0519-86330095，E-mail:songrg＠cczu.edu.cn

Received date: 2023-05-09

Revised date: 2023-06-18

Accepted date: 2023-07-10

Online published: 2024-03-08

Supported by

National Natural Science Foundation of China (51871031)

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摘要

为探究恒压与恒流相互叠加模式对AZ31B 镁合金微弧氧化膜层组织与性能的影响，利用AZ31B 镁合金为基材，在电解液和电参数相同的前提下，采用恒流、恒压、先恒流再恒压、先恒压再恒流4 种不同电源工作模式在AZ31B 镁合金表面制备微弧氧化陶瓷膜。采用扫描电镜(SEM)、电化学工作站、X 射线衍射仪(XRD)、高温摩擦磨损机等检测手段，对AZ31B 镁合金微弧氧化陶瓷膜层进行测试。结果表明:基材经微弧氧化处理后，表面生成微弧氧化陶瓷膜。在先恒流再恒压(0.7 A/6 min＋400 V/4 min)电源模式下制备的微弧氧化陶瓷膜的MgO、MgF2以及Mg2SiO4等强化相的峰值比其他模式下制备的膜层高；膜层表面平整，微孔小且分布均匀，致密性较好，膜层与基体紧密结合；相对于其他模式下的膜层，其被磨穿时长最长，材料的耐磨性得到提升；其腐蚀电位相对于基体，从-1.497 4 V增加到-1.376 9 V，腐蚀速率从0.009 1 mm/a 降低到0.002 0 mm/a，耐腐蚀性显著提升。

关键词： AZ31B 镁合金; 恒压恒流交互; 微弧氧化; 组织; 性能

本文引用格式

束银凤, 姜波, 王超, 宋仁国 . 恒压恒流交互模式对AZ31B镁合金微弧氧化陶瓷膜组织与性能的影响[J]. 材料保护, 2024 , 57(2) : 35 -42 . DOI: 10.16577/j.issn.1001-1560.2024.0031

Abstract

In order to study the effect of the superposition mode of constant voltage and constant current on the microstructure and properties of micro-arc oxidation coatings on AZ31B magnesium alloy，the AZ31B magnesium alloy was used as substrate under the condition of the same electrolyte and electric parameters，and micro-arc oxidation (MAO) ceramic coatings were prepared on AZ31B magnesium alloy by four different power supply working modes: constant current，constant voltage，first constant current and then constant voltage，first constant voltage and then constant current.Subsequently，scanning electron microscopy(SEM)，electrochemical workstation，X-ray diffraction (XRD) and high-temperature friction and wear tester were used to characterize the MAO ceramic coatings on AZ31B magnesium alloy.Results showed that after the substrate was treated with micro-arc oxidation， a micro-arc oxidation ceramic coating was formed on the surface.The peaks of MgO， MgF2 and Mg2SiO4 reinforcement phases of the as-prepared MAO coating under the power mode of first constant current and then constant voltage (0.7 A/6 min＋400 V/4 min) were higher than those under the other modes.In addition， the surface of MAO ceramic coatings was flat， the micropores were small and evenly distributed， the compactness was good， and the coatings was closely combined with the substrate.Compared with the coatings obtained under the other modes， the wear time of the coating prepared under the power mode of first constant current and then constant voltage had the longest wear through time， and the wear resistance of the material was improved.In the comparison of the substrate， the corrosion potential of the coating prepared under the power mode of first constant current and then constant voltage increased from -1.497 4 V to -1.376 9 V， and the corrosion rate was reduced from 0.009 1 mm/a to 0.002 0 mm/a，indicating that the corrosion resistance was significantly improved.

Key words： AZ31B magnesium alloy; constant voltage and constant current interaction; micro-arc oxidation; microstructure; properties

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