水热处理对<strong>AZ31</strong>镁合金微弧氧化陶瓷层组织结构及耐蚀性的影响

doi:10.11901/1005.3093.2019.430

材料研究学报

2020, Vol. 34

Issue (3): 183-190 DOI: 10.11901/1005.3093.2019.430

研究论文

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水热处理对AZ31镁合金微弧氧化陶瓷层组织结构及耐蚀性的影响

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

Effect of Hydrothermal Treatment on Microstructure and Corrosion Resistance of Micro-arc Oxidization Ceramic Layer on AZ31 Mg-alloy

WANG Zhihu¹,ZHANG Jumei²,BAI Lijing¹,ZHANG Guojun¹(

)

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 and Technology, Xi’an 710054, China

引用本文:

王志虎,张菊梅,白力静,张国君. 水热处理对AZ31镁合金微弧氧化陶瓷层组织结构及耐蚀性的影响[J]. 材料研究学报, 2020, 34(3): 183-190.
Zhihu WANG, Jumei ZHANG, Lijing BAI, Guojun ZHANG. Effect of Hydrothermal Treatment on Microstructure and Corrosion Resistance of Micro-arc Oxidization Ceramic Layer on AZ31 Mg-alloy[J]. Chinese Journal of Materials Research, 2020, 34(3): 183-190.

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摘要:

采用两种不同成分的溶液对AZ31镁合金微弧氧化(MAO)陶瓷层进行125℃+18 h的水热处理，研究了水热溶液成分对微弧氧化陶瓷层组织结构及耐蚀性能的影响，探讨了水热成膜及膜层腐蚀机理。研究结果表明：水热处理过程中微弧氧化陶瓷层表面的MgO部分溶解，释放出的Mg²⁺与碱性水热溶液中的OH^-结合形成Mg(OH)₂纳米片沉淀在陶瓷层表面及孔洞内；而在含有Al³⁺和Co²⁺的溶液处理过程中，溶液中的Al³⁺和Co²⁺取代沉淀在MgO表面及孔洞内的Mg(OH)₂中部分Mg²⁺的位置形成双金属氢氧化物(LDH)纳米片，将微弧氧化陶瓷层表面的孔洞及裂纹缺陷闭合。润湿性与电化学测试结果表明，亲水性的Mg(OH)₂/MAO复合膜层因Mg(OH)₂对MAO陶瓷层的封孔效应能在一定程度上提高MAO陶瓷层的耐蚀性，而疏水性的LDH/MAO复合膜层因封孔效应和LDH离子交换能力能显著提高MAO陶瓷层的耐蚀性。

关键词 ：材料失效与保护, 镁合金, 微弧氧化, 水热处理, 薄膜

Abstract：

The micro-arc oxidization (MAO) ceramic layer on AZ31 Mg-alloy was post-treated by hydrothermal treatment at 125℃ for 18 h with two solutions of different compositions. The effect of hydrothermal solutions on the microstructure and corrosion resistance of MAO ceramic layer was studied, and the relevant formation- and corrosion-mechanism of the film generated via hydrothermal treatment were discussed. The results show that MgO on the MAO ceramic layer was partially dissolved during hydrothermal treatment, and the released Mg²⁺ was combined with OH^- in alkaline hydrothermal solution to form Mg(OH)₂ nanosheets, which deposited on the surface of ceramic layer and pores; whereas Al³⁺ and Co²⁺ in the other solution might replace some Mg²⁺ in Mg(OH)₂ to form layered double hydroxides (LDH) nanoplates, which could seal the micro-poles and cracks on the MAO ceramic layer. Wettability and electrochemical test results show that the sealing effect of hydrophilic Mg(OH)₂ coating on MAO ceramic layer can improve the corrosion resistance of MAO ceramic layer to some extent. However, hydrophobic LDH coating can significantly improve the corrosion resistance of MAO ceramic coating due to the sealing effect and the ion exchange ability of LDH.

Key words： materials failure and protection magnesium alloy micro-arc oxidization hydrothermal treatment coating

收稿日期: 2019-09-03

ZTFLH:

TG174

基金资助:国家自然科学基金(51701162);陕西省教育厅重点实验室项目(17JS083)

作者简介: 王志虎，男，1978年生，博士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2019.430 或 https://www.cjmr.org/CN/Y2020/V34/I3/183

图1 三种膜层的截面形貌及三维表面形貌图

图2 不同试样的XRD图谱

图3 三种膜层的表面低倍与高倍形貌

图4 三种膜层标定位置的EDS能谱

图5 三种膜层的静态接触角

图6 AZ31基体及三种膜层的动电位极化曲线

表1 AZ31基体及三种膜层的电化学拟合参数

图7 三种膜层的Nyquist和Bode图

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