电参数对<strong>AZ31B</strong>镁合金微弧氧化膜能耗及耐蚀性的影响

doi:10.11902/1005.4537.2023.284

中国腐蚀与防护学报

2024, Vol. 44

Issue (4): 1064-1072 CSTR: 32134.14.1005.4537.2023.284 DOI: 10.11902/1005.4537.2023.284

轻质合金腐蚀与防护专栏

本期目录 | 过刊浏览

电参数对AZ31B镁合金微弧氧化膜能耗及耐蚀性的影响

田梦真¹, 王勇², 李涛³, 汪川², 郭泉忠²(

), 郭建喜⁴(

)

1.辽宁大学化学院沈阳 110036
2.中国科学院金属研究所沈阳 110016
3.滨州魏桥国科高等技术研究院山东省先进铝基材料与技术重点实验室滨州 256600
4.海军勤务学院天津 300450

Effect of Electrical Parameters on Energy Consumption and Corrosion Resistance of Micro-arc Oxidation Coating on AZ31B Mg-alloy

TIAN Mengzhen¹, WANG Yong², LI Tao³, WANG Chuan², GUO Quanzhong²(

), GUO Jianxi⁴(

)

1. College of Chemistry, Liaoning University, Shenyang 110036, China
2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3. Shandong Key Laboratory of Advanced Aluminium Materials and Technology, Binzhou Institute of Technology, Binzhou 256600, China
4. Naval Service Academy, Tianjin 300450, China

引用本文:

田梦真, 王勇, 李涛, 汪川, 郭泉忠, 郭建喜. 电参数对AZ31B镁合金微弧氧化膜能耗及耐蚀性的影响[J]. 中国腐蚀与防护学报, 2024, 44(4): 1064-1072.
Mengzhen TIAN, Yong WANG, Tao LI, Chuan WANG, Quanzhong GUO, Jianxi GUO. Effect of Electrical Parameters on Energy Consumption and Corrosion Resistance of Micro-arc Oxidation Coating on AZ31B Mg-alloy[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(4): 1064-1072.

全文: PDF(9984 KB) HTML

摘要:

微弧氧化可提高镁合金表面的耐腐蚀性，但微弧氧化存在能耗高的不足，限制其在镁合金部件上的大规模应用。为降低微弧氧化的能耗，采用脉冲微弧氧化电源在AZ31B镁合金表面制备微弧氧化膜层，通过盐雾实验、电化学测试、扫描电镜等表征手段，研究恒流模式下电参数(频率、占空比、电流密度)对膜层单位能耗和耐蚀性能的影响。结果表明，频率对膜层单位能耗影响较小，但频率越高，膜层耐蚀性能越好；占空比对能耗的影响比较明显，随占空比的升高，膜层单位能耗减小，但耐蚀性能降低；电流密度也显著影响能耗，电流密度越大，膜层单位能耗越大，但电流密度变化对膜层的耐蚀性能影响较小。

关键词 ：微弧氧化, 镁合金, 能耗, 耐蚀性

Abstract：

Micro-arc oxidation (MAO) can improve the corrosion resistance of Mg-alloys, but it has the deficiency of high energy consumption, which restricts its large-scale application on Mg-alloy components. In order to reduce the energy consumption of micro-arc oxidation, micro-arc oxidation coatings were prepared on the surface of AZ31B Mg-alloy in an electrolyte of Na₂SiO₃ 20 g/L, NaOH 2 g/L and NaF 2 g/L by pulsed power supply, and the effects of electrical parameters (frequency, duty cycle and current density) on the unit energy consumption and corrosion resistance of the coatings were studied by means of scanning electron microscopy, electrochemical testing and salt spray test. The results show that the frequency has less effect on the unit energy consumption of the coatings, but the higher the frequency, the better the corrosion resistance of the coatings; the duty cycle has more obvious effect on the energy consumption, with the increase of the duty cycle, the unit energy consumption of the coatings decreases, but the corrosion resistance decreases; the current density also has a significant influence on the energy consumption, the higher the current density, the higher the unit energy consumption of the coatings, but the change of current density has less effect on the corrosion resistance of the coatings.

Key words： Micro-arc oxidation Mg-alloy energy consumption corrosion resistance

收稿日期: 2023-09-11 32134.14.1005.4537.2023.284

ZTFLH:

TG174.4

基金资助:魏桥国科高研院-中科院金属研究所研发项目(GYY-JSBU-2022-006)

通讯作者: 郭泉忠，E-mail: qzguo@imr.ac.cn，研究方向为腐蚀科学与防护、电化学制造；
郭建喜，E-mail:1419863531@qq.com，研究方向为海军舰务

Corresponding author: GUO Quanzhong, E-mail: qzguo@imr.ac.cn;

作者简介: 田梦真，女，1998年生，硕士生

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图1 不同频率时微弧氧化过程的U-t和I-t曲线

表1 不同频率下制备的微弧氧化膜层的能耗

图2 不同频率下制备的微弧氧化膜层的微观形貌

图3 不同频率下制备的微弧氧化膜层极化曲线

表2 与图3极化曲线对应的拟合数据

图4 不同频率下制备的微弧氧化膜层96 h中性盐雾实验后的宏观形貌

表3 不同频率下制备的微弧氧化膜层中性盐雾实验结果

表4 不同占空比下制备的微弧氧化膜层的能耗

图5 不同占空比下所制备的微弧氧化膜层的微观形貌

图6 不同占空比下制备的微弧氧化膜层极化曲线

表5 与图6极化曲线对应的拟合数据

图7 不同占空比下制备的微弧氧化膜层96 h中性盐雾实验后的宏观形貌

表6 不同占空比下制备的微弧氧化膜层中性盐雾实验结果

表7 不同电流密度下制备的微弧氧化膜层的能耗

图8 不同电流密度下所制备的微弧氧化膜层的微观形貌

图9 不同电流密度下所制备的微弧氧化膜层表面孔径尺寸数量分布

图10 不同电流密度下制备的微弧氧化膜层极化曲线

表8 与图10极化曲线对应的拟合数据

表9 不同电流密度下制备的微弧氧化膜层中性盐雾实验结果

图11 不同电流密度下制备的微弧氧化膜层96 h中性盐雾实验后的宏观形貌

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