镁合金表面层状双氢氧化物的电化学沉积和表征

doi:10.11902/1005.4537.2019.178

中国腐蚀与防护学报

2019, Vol. 39

Issue (5): 453-457 DOI: 10.11902/1005.4537.2019.178

研究报告

本期目录 | 过刊浏览

镁合金表面层状双氢氧化物的电化学沉积和表征

欧阳跃军¹,胡婷²,王佳音²,谢治辉²(

)

1. 怀化学院化学与材料工程学院怀化 418000
2. 西华师范大学化学化工学院化学合成与污染控制四川省重点实验室南充 637002

Electrochemical Deposition and Characterization of Layered Double Hydroxide Film on Magnesium Alloys

OUYANG Yuejun¹,HU Ting²,WANG Jiayin²,XIE Zhihui²(

)

1. College of Chemistry and Materials Engineering, Huaihua University, Huaihua 418000, China
2. Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, College of Chemistry and Chemical Engineering, China West Normal University, Nanchong 637002, China

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摘要:

报道了利用电化学沉积直接在AZ31镁合金基底上制备镁铝层状双氢氧化物 (MgAl-LDH) 的方法。通过XRD，FT-IR，SEM，EIS和Tafel极化曲线表征涂层的表面形貌和耐腐蚀性能。结果表明，与镁合金基体相比，优化工艺下制得的涂层在3.5% (质量分数) NaCl溶液中具有良好的耐腐蚀性，可以有效地保护镁合金免受腐蚀。涂层的阻抗模值相比于镁合金基体增加了2个数量级，自腐蚀电位提高了0.96 V，腐蚀电流密度降低了3个数量级。结果显示通过简单的电化学沉积可以在镁合金表面形成具有良好耐腐蚀性能的MgAl-LDH涂层。

关键词 ：镁合金, 电化学沉积, 层状双氢氧化物, 耐腐蚀性能

Abstract：

MgAl-layered double hydroxide (MgAl-LDH) coatings were prepared on AZ31 magnesium alloy by electrochemical deposition. The surface morphology and corrosion resistance of the coatings were characterized by X-ray diffraction (XRD), Fourier infrared spectrometer (FT-IR), scanning electron microscope (SEM), electrochemical impedance spectroscopy (EIS) and Tafel polarization curves. The results show that the coating prepared with the optimal processing parameters has good corrosion resistance in 3.5%(mass fraction) NaCl solution and can effectively protect the magnesium alloy from corrosion. In comparison to those of the bare My-alloy substrate, the impedance modulus of the coating is increased by two orders of magnitude , the free-corrosion potential is increased by 0.96 V, and the corrosion current density is reduced by three orders of magnitude. These findings demonstrate that the MgAl-LDH coatings with good corrosion resistance can be obtained by a simple electrochemical deposition method.

Key words： magnesium alloy electrochemical deposition layered double hydroxide corrosion

收稿日期: 2019-09-30

ZTFLH:

TQ153

基金资助:中国科协青年人才托举工程(2018QNRC001);国家自然科学基金(51501157);四川省科技厅应用基础项目(2018JY0483)

通讯作者: 谢治辉 E-mail: zhxie@cwnu.edu.cn

Corresponding author: Zhihui XIE E-mail: zhxie@cwnu.edu.cn

作者简介: 欧阳跃军，男，1972年生，博士

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引用本文:

欧阳跃军,胡婷,王佳音,谢治辉. 镁合金表面层状双氢氧化物的电化学沉积和表征[J]. 中国腐蚀与防护学报, 2019, 39(5): 453-457.
Yuejun OUYANG, Ting HU, Jiayin WANG, Zhihui XIE. Electrochemical Deposition and Characterization of Layered Double Hydroxide Film on Magnesium Alloys. Journal of Chinese Society for Corrosion and protection, 2019, 39(5): 453-457.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.178 或 https://www.jcscp.org/CN/Y2019/V39/I5/453

图1 AZ31镁合金在不同电压下电沉积LDH后的表面形貌

图2 AZ31镁合金在不同电压下电沉积LDH后的XRD谱

图3 AZ31镁合金在不同电压下沉积LDH后的FT-IR谱

图4 AZ31镁合金和在不同电压下沉积的LDH涂层在3.5%NaCl溶液中的EIS模值图和相位角图以及相应的等效电路图

图5 镁合金和在不同电压下沉积的LDH涂层在3.5%NaCl溶液中的Tafel图

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