AZ91镁合金表面微弧氧化与化学镀铜复合处理层的微观组织与性能

doi:10.11902/1005.4537.2017.061

中国腐蚀与防护学报

2018, Vol. 38

Issue (4): 391-396 DOI: 10.11902/1005.4537.2017.061

研究报告

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AZ91镁合金表面微弧氧化与化学镀铜复合处理层的微观组织与性能

王志虎¹, 张菊梅², 白力静¹, 张国君¹(

)

1 西安理工大学材料科学与工程学院西安 710048
2 西安科技大学材料科学与工程学院西安 710054

Microstructure and Property of Composite Coatings on AZ91 Mg-alloy Prepared by Micro-arc Oxidation and Electroless Cu-layer

Zhihu WANG¹, Jumei ZHANG², Lijing BAI¹, Guojun ZHANG¹(

)

1 School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China
2 School of Materials Science and Engineering, Xi'an University of Science &Technology, Xi'an 710054, China;

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摘要:

采用微弧氧化技术在AZ91镁合金表面制备MgO陶瓷膜层,然后在该膜层通过化学镀铜技术制备金属铜层。利用SEM,XRD,EDS,电化学实验及四探针测试等手段研究了复合膜层的显微结构、相组成、耐蚀性和导电性。结果表明：微弧氧化处理获得以MgO为主相的陶瓷层可有效提高镁合金的耐蚀性,平均厚度为2.5 μm的化学镀铜层连续均匀地覆盖在微弧氧化陶瓷层表面,渗入并填充微弧氧化陶瓷层内部呈网状分布的孔隙,形成交错咬合状态;复合膜层表面的导电性良好,与基体镁合金相比,复合膜层的腐蚀电位提高了0.2 V,腐蚀电流密度下降了一个数量级。但由于化学镀铜层与基体镁合金之间产生的电偶腐蚀,导致复合膜层的耐蚀性较陶瓷层有所下降。

关键词 ：镁合金, 微弧氧化, 化学镀铜, 耐蚀性, 导电性

Abstract：

MgO ceramic coating was prepared firstly on AZ91 Mg-alloy by micro-arc oxidation (MAO),and on which then a Cu-layer was deposited by electroless copper plating. The microstructure, composition, corrosion resistance and electrical conductivity of the composite coating were characterized by means of SEM, XRD, EDS, electrochemical techniques and four-point probe test. The results indicate that the corrosion resistance of Mg-alloy can be effectively improved due to the existence of the ceramic MAO coating, and the 2.5 μm-thick Cu-layer is evenly covered on the surface of MAO coating, while the deposited Cu penetrates and fills the reticular-like pores on the MAO coating and thus to realize a mechanical interlock between the Cu-layer and the MAO coating. The composite coating exhibits well electrical conductivity. Meanwhile, the free corrosion potential of the composite coating increases by 0.2 V, and the corrosion current density is one order of magnitude lower in comparison with the bare Mg-alloy. However, the corrosion resistance of the composite coating is inferior to that of the MAO coating because of the galvanic corrosion between the Cu-layer and the matrix Mg-alloy.

Key words： Mg-alloy micro-arc oxidation electroless copper plating corrosion resistance electrical conductivity

收稿日期: 2017-04-25

ZTFLH:

TG174.44

基金资助:国家自然科学基金 (51674196,51601144和51701162)

作者简介:

作者简介王志虎,男,1978年生,博士生

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引用本文:

王志虎, 张菊梅, 白力静, 张国君. AZ91镁合金表面微弧氧化与化学镀铜复合处理层的微观组织与性能[J]. 中国腐蚀与防护学报, 2018, 38(4): 391-396.
Zhihu WANG, Jumei ZHANG, Lijing BAI, Guojun ZHANG. Microstructure and Property of Composite Coatings on AZ91 Mg-alloy Prepared by Micro-arc Oxidation and Electroless Cu-layer. Journal of Chinese Society for Corrosion and protection, 2018, 38(4): 391-396.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.061 或 https://www.jcscp.org/CN/Y2018/V38/I4/391

图1 微弧氧化陶瓷层及化学镀铜层的XRD谱

图2 微弧氧化陶瓷膜层及镀铜层的表面形貌

图3 复合膜层的截面形貌

图4 图3中复合膜层截面不同位置的EDS结果

图5 镁合金基体、MAO膜层及复合膜层的极化曲线

表1 镁合金基体、MAO膜层及复合膜层的电化学参数

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