电化学阻抗谱研究负向电压对AZ31B镁合金微弧氧化陶瓷层致密性的影响

中国腐蚀与防护学报

2012, Vol. 32

Issue (6): 467-472

研究报告

本期目录 | 过刊浏览

电化学阻抗谱研究负向电压对AZ31B镁合金微弧氧化陶瓷层致密性的影响

郭泉忠^{1, 张伟¹,杜克勤¹,王荣²}

1.中国科学院金属研究所金属腐蚀与防护国家重点实验室沈阳 110016

2. 中国兵器科学研究院宁波分院宁波315103

EFFECT OF NEGATIVE POTENTIAL ON COMPACTNESS OF PLASMA ELECTROLYTIC OXIDATION COATINGS ON MAGNESIUM ALLOY AZ31B BY ELECTROCHEMICAL IMPEDANCE SPECTRUM

GUO Quanzhong¹, ZHANG Wei¹, DU Keqin¹, WANG Rong²

1. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy ofScience, Shenyang 110016

2. The Ningbo Branch of Ordnance Science of China, Ningbo 315103

全文: PDF(2895 KB)

摘要:

采用单极性和双极性脉冲，分别改变几种不同正向电压时的负向电压，在AZ31B镁合金表面制备了微弧氧化膜。利用电化学阻抗谱和扫描电镜研究氧化膜的等效电路元件值以及微观结构的变化，从而分析负向电压对镁合金微弧氧化膜致密性的影响。结果表明：负向电压对于微弧氧化陶瓷膜致密性具有至关重要的作用，适当的负向电压可以有效地提高膜层致密性。并且，不同的正向电压下形成致密氧化膜的负向电压都约为30 V，不随正向电压变化而变化。

关键词 ：镁合金, 微弧氧化, 负向电压, 电化学阻抗谱, 致密性

Abstract：

The effect of negative potential of bipolar pulse on the compactness of plasma electrolytic oxidation (PEO) coating on magnesium alloy is not definite nowadays. PEO coatings on magnesium alloy AZ31B were prepared by respectively using unipolar and bipolar pulse whose negative potential was changed while positive potential was at several levels. In order to analyze the effect of negative potential on compactness of PEO coatings, the samples were examined by electrochemical impedance spectrum (EIS) and scanning electron microscope (SEM) to study the variation of equivalent circuit data and the change of macrostructure. The results have shown that negative potential plays an important role on compactness of PEO coatings and suitable negative potential can increase the compactness of coatings. The negative potential of pulse which can prepare compact coatings is always 30 V and stays the same at several levels of positive potential.

Key words： magnesium alloy plasma electrolytic oxidation negative potential electrochemical impedance spectrum compactness

收稿日期: 2011-11-28

ZTFLH:

TG174.4

基金资助:

材料基础与应用技术重点项目(A0920110028)，国家科技支撑计划(2011BAE22B05)和辽宁省重大科技计划项目 (YOF1811181)资助

通讯作者: 杜克勤 E-mail: kqdu@imr.ac.cn

作者简介: 郭泉忠，男，1987年生，博士生，研究方向为金属腐蚀与防护

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引用本文:

郭泉忠, 张伟,杜克勤,王荣. 电化学阻抗谱研究负向电压对AZ31B镁合金微弧氧化陶瓷层致密性的影响[J]. 中国腐蚀与防护学报, 2012, 32(6): 467-472.
GUO Quanzhong, ZHANG Wei, DU Keqin, WANG Rong. EFFECT OF NEGATIVE POTENTIAL ON COMPACTNESS OF PLASMA ELECTROLYTIC OXIDATION COATINGS ON MAGNESIUM ALLOY AZ31B BY ELECTROCHEMICAL IMPEDANCE SPECTRUM. Journal of Chinese Society for Corrosion and protection, 2012, 32(6): 467-472.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2012/V32/I6/467

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