第35卷第6期无机材料学报Vol. 35No. 6 2020年6月Journal of Inorganic Materials Jun., 2020文章编号: 1000-324X(2020)06-0709-08 DOI: 10.15541/jim20190426
网络收集AZ31镁合金微弧氧化陶瓷层表面Mg(OH)2 膜层的制备及耐蚀性
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)单兵作战系统
摘要: 采用不同浓度的NaOH溶液对AZ31镁合金微弧氧化(Micro-arc oxidation, MAO)陶瓷层进行水热处理, 研究了水热溶液浓度对MAO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的腐蚀机理。研究结果表明：水热处理过程中MAO陶瓷层表面的MgO部分溶解, 释放出的Mg2+与水热溶液中的OH–结合形成Mg(OH)2纳米片沉淀在陶瓷层表面及孔洞内。随着水热溶液中NaOH浓度的增加, 水热处理过程中形成的Mg(OH)2将MAO陶瓷层表面的孔洞及裂纹等固有缺陷闭合, 提高了膜层的致密性。电化学实验结果表明, MAO及水热复合处理所制备的Mg(OH)2/MAO复合膜层比单一MAO陶瓷层具有更好的耐蚀性, 而且随着NaOH浓度的提高, Mg(OH)2/MAO复合膜层的耐蚀性增强; 浸泡实验结果表明Mg(OH)2/MAO复合膜层能为镁合金基体提供长久的腐蚀防护保护能力。
关键词: 镁合金; 微弧氧化; 水热处理; 复合膜层; 耐蚀性
中图分类号: TG174; TG179文献标识码: A
Mg(OH)2 Film on Micro-arc Oxidation Ceramic Coating of AZ31 Magnesium
Alloy: Preparation and Corrosion Resistance
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)
电力线网络摄像机
Abstract: The micro-arc oxidation (MAO) ceramic coating on AZ31 magnesium alloy was treated by hydrother-mal treatment in NaOH solution to study the effect of the concentration of NaOH solution on the microstructure and corrosion resistance of the obtained Mg(OH)2/MAO composite coating, the formation mechanism and the corrosion mechanism of the hydrothermal film was annalysed at the same time. The results showed that MgO in the surface of MAO ceramic layer was partially disso
HD-PRIDElved during hydrothermal reaction. And the released Mg2+was combined with OH– in hydrothermal solution to form Mg(OH)2 nanosheets which deposited on the surface of ceramic layer and inner wall of the pores.With increasing of NaOH concentration of the hydrothermal solution, more Mg(OH)2 formed during hydrothermal reaction and sealed the inherent defects such as pores and cracks in the MAO ceramic layer, which improved the compactness of the coating. In addition, the electrochemical test results demonstrated that the Mg(OH)2/MAO composite coating prepared by MAO and hydrothermal treatment achieved better corrosion resistance than the single MAO ceramic layer, and the corrosion resistance of Mg(OH)2/MAO composite coating
收稿日期: 2019-08-14; 收到修改稿日期:2019-10-29
柴油燃烧器基金项目：国家自然科学基金(51701162); 陕西省教育厅重点实验室项目(17JS083)
National Natural Science Foundation of China (51701162); Key Laboratory Project of Shaanxi Education Department
(17JS083)
作者简介：王志虎(1978–), 男, 博士研究生, 高级工程师.E-mail:******************
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WANGZhihu(1978–),male,PhDcandidate,seniorengineer.E-mail:******************通讯作者：张国君, 教授.E-mail:********************
ZHANGGuojun,professor.E-mail:********************
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