5083铝合金表面单致密微弧氧化膜的制备及其性能研究

doi:10.11902/1005.4537.2019.069

中国腐蚀与防护学报

2020, Vol. 40

Issue (3): 251-258 DOI: 10.11902/1005.4537.2019.069

研究报告

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5083铝合金表面单致密微弧氧化膜的制备及其性能研究

曹京宜¹^,², 方志刚¹, 陈晋辉³, 陈志雄³, 殷文昌¹, 杨延格¹^,²^,⁴, 张伟⁴(

)

1 中国人民解放军92228部队北京 100072
2 海军研究院博士后科研工作站北京 100073
3 福建龙溪轴承 (集团) 股份有限公司漳州 363000
4 中国科学院金属研究所金属腐蚀与防护实验室沈阳 110016

Preparation and Properties of Micro-arc Oxide Film with Single Dense Layer on Surface of 5083 Aluminum Alloy

CAO Jingyi¹^,², FANG Zhigang¹, CHEN Jinhui³, CHEN Zhixiong³, YIN Wenchang¹, YANG Yange¹^,²^,⁴, ZHANG Wei⁴(

)

1 Unit 92228, People's Liberation Army, Beijing 100072, China
2 Postdoctoral Research Station of Naval Research Academy, Beijing 100073, China
3 Fujian LongXi Bearing (Group) Corp. , LTD, Zhangzhou 363000, China
4 Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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摘要:

采用响应曲面法对微弧氧化电解液体系进行了优化，并在5083铝合金表面进行了单致密微弧氧化涂层的制备。通过扫描电镜、X射线衍射仪、显微硬度计和极化曲线对铝合金微弧氧化膜的微观组织、显微硬度和耐蚀性进行了研究。结果表明：随着微弧氧化膜层厚度从30 μm增加到90 μm，烧结颗粒的尺寸从约为10 μm增加到约为50 μm，致密层由最初的20 μm增加到70 μm，陶瓷膜层中α-Al₂O₃的比例明显增加，涂层的硬度由900 HV提高到1500 HV。依据极化曲线和盐雾实验结果发现：随着微弧氧化时间的增加，微弧氧化膜的自腐蚀电流密度逐渐降低，钝化能力逐渐增强，膜层的耐腐蚀性能大幅度提高。

关键词 ：铝合金, 微弧氧化, 单致密层, 耐蚀性

Abstract：

Marine Al-alloy 5083 owns low density, good weldability and high hardness, but it is easily suffered from pitting corrosion in sea water due to the effect of Cl^-. Micro-arc oxidation (MAO) is an effective way to improve the corrosion resistance of Al-alloy. In the present study the electrolyte formula was optimized via response surface methodology so that to acquire a novel MAO coating on Al-alloy 5083, which composed of merely a dense layer. The prepare MAO coating was then characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), micro-hardness meter and dynamic polarization technology in terms of microstructure, micro-hardness and corrosion resistance. Results showed that in comparison with the coating prepared with the ordinary electrolyte, the thickness of the MAO coating increases from 30 μm to 90 μm, size of the sintered particles on MAO coating grown from 10 μm to 50 μm, and the thickness of the dense layer increased from 20 μm to 70 μm, accompanied by the increase of the percentage of α-Al₂O₃ in the MAO coating as well. The hardness of the polished MAO coating increased from 900 HV to 1500 HV. Polarization curve and salt frog test results also found that with the increasing of micro-arc oxidation time, the corrosion current density of MAO coating was gradually decreased, while its passivation ability was enhanced. Therefore, corrosion resistance of Al-alloy 5083 was increased substantially in the presence of the MAO coating composed merely of a thick dense layer.

Key words： aluminum alloy micro-arc oxidation single dense layer corrosion resistance

收稿日期: 2019-06-01

ZTFLH:

TG174

通讯作者: 张伟 E-mail: weizhang@imr.ac.cn

Corresponding author: ZHANG Wei E-mail: weizhang@imr.ac.cn

作者简介: 曹京宜，女，1972年生，研究员

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引用本文:

曹京宜, 方志刚, 陈晋辉, 陈志雄, 殷文昌, 杨延格, 张伟. 5083铝合金表面单致密微弧氧化膜的制备及其性能研究[J]. 中国腐蚀与防护学报, 2020, 40(3): 251-258.
Jingyi CAO, Zhigang FANG, Jinhui CHEN, Zhixiong CHEN, Wenchang YIN, Yange YANG, Wei ZHANG. Preparation and Properties of Micro-arc Oxide Film with Single Dense Layer on Surface of 5083 Aluminum Alloy. Journal of Chinese Society for Corrosion and protection, 2020, 40(3): 251-258.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.069 或 https://www.jcscp.org/CN/Y2020/V40/I3/251

表1 实验因素及水平

表2 实验方案设计及相应实验结果

图1 氧化膜电阻值的三维曲面分析

图2 自腐蚀电流的三维曲面分析

图3 氧化膜孔隙率的三维曲面分析

图4 微弧氧化膜的表面和截面形貌

图5 不同氧化时间的微弧氧化膜的XRD谱

表3 不同厚度微弧氧化膜的硬度值

图6 不同厚度微弧氧化膜极化曲线实验结果

表4 极化曲线拟合结果

图7 不同厚度微弧氧化膜的盐雾实验结果

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