微弧氧化处理对镁合金腐蚀行为的影响

中国腐蚀与防护学报

2006, Vol. 26

Issue (4): 216-220

研究报告

本期目录 | 过刊浏览

微弧氧化处理对镁合金腐蚀行为的影响

王燕华;王佳;张际标

山东青岛南海路7号中科院海洋所腐蚀室

Influence of Micro-Arc Oxidation Treatment on the Corrosion Behavior of AZ91D Magnesium Alloy

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山东青岛南海路7号中科院海洋所腐蚀室

全文: PDF(277 KB)

摘要: 采用碱性硅酸盐溶液，在AZ91D镁合金试样表面制得微弧氧化膜，并利用电化学阻抗方法对镁合金及微弧氧化处理试样在35%NaCl溶液中的腐蚀行为进行比较研究.结果表明，镁合金经微弧氧化处理后，腐蚀电位和膜层阻抗均有一定程度的提高.但在浸泡过程中，微弧氧化处理试样的电化学参数呈现出不同的变化规律，初期波动较大，后期则逐渐降低，趋向稳定.

关键词 ：微弧氧化, 镁合金, 腐蚀, 电化学阻抗

Abstract：To investigate the influence of micro-arc oxidation (MAO) treatment,a layer of ceramic coating was prepared on AZ91D magnesium alloy by using MAO technique in alkali-silicate solution.The corrosion resistance of MAO treated and untreated AZ91D magnesium alloy was studied in 3.5mass% NaCl solution by means of the electrochemical impedance spectroscopy (EIS) method.During the immersion process,both specimens exhibited two kinds of impedance diagrams,two capacitive loops at the initial stage and one capacitive with one inductive loop at the later stage.Compared with the untreated magnesium alloy,the MAO treated specimen exhibited positive corrosion potential and increased resistance.Both the corrosion potential and the resistance of the MAO treated specimen fluctuated at the initial stage of immersion,afterwards decreased.A two-stage deterioration mechanism,the MAO coating deterioration and the Mg alloy localized corrosion,was proposed to describe the corrosion process of the MAO treated Mg alloy. 

Key words： micro-arc oxidation Mg-alloy corrosion EIS

收稿日期: 2005-06-08

ZTFLH:

TG146.2

通讯作者: 王燕华 E-mail: wyhazz@163.com

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引用本文:

王燕华; 王佳; 张际标 . 微弧氧化处理对镁合金腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2006, 26(4): 216-220 .

链接本文:

https://www.jcscp.org/CN/Y2006/V26/I4/216

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