AZ91D镁合金表面不同树脂体系富镁涂层的保护性能

doi:10.11949/j.issn.0438-1157.20150542

化工学报 ›› 2015, Vol. 66 ›› Issue (11): 4578-4587.DOI: 10.11949/j.issn.0438-1157.20150542

AZ91D镁合金表面不同树脂体系富镁涂层的保护性能

卢向雨^1,3, 吴静英¹, 左禹², 郑传波¹

1 江苏科技大学材料科学与工程学院, 江苏镇江 212003;
2 北京化工大学材料科学与工程学院, 北京 100029;
3 材料腐蚀与防护四川省重点实验室, 四川自贡 643000

收稿日期:2015-04-30 修回日期:2015-06-10 出版日期:2015-11-05 发布日期:2015-11-05
通讯作者: 郑传波
基金资助:
江苏省高校自然科学研究项目(14KJB430012);材料腐蚀与防护四川省重点实验室开放基金项目(2015CL08);国家自然科学基金项目(51301060);江苏省自然科学基金项目(BK20141292);江苏高校优势学科建设工程资助项目(PAPD)。

Protection performance of Mg-rich coatings formed by different epoxyresins on AZ91D alloys

LU Xiangyu^1,3, WU Jingying¹, ZUO Yu², ZHENG Chuanbo¹

1 School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu, China;
2 School of Materials Science and Engineering, Beijing University of Chemical and Technology, Beijing 100029, China;
3 Material Corrosion and Protection Key Laboratory of Sichuan Province, Zigong 643000, Sichuan, China

Received:2015-04-30 Revised:2015-06-10 Online:2015-11-05 Published:2015-11-05
Supported by:
supported by the Natural Science Research Program for Higher Education in Jiangsu Province, China (14KJB430012), the Open Foundation of Material Corrosion and Protection Key Laboratory of Sichuan(2015CL08), the National Natural Science Foundation of China (51301060), the Natural Science Foundation of Jiangsu Province, China (BK20141292) and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

摘要/Abstract

摘要：

采用划叉浸泡实验,电化学交流阻抗(electrochemical impedance spectroscopy,EIS),开路电位(open circuit potential,OCP)及动电位扫描研究了不同类型的环氧树脂对于AZ91D镁合金的表面的富镁涂层的保护性能的影响。结果表明环氧618-593构成的富镁涂层防护性能较差;环氧6101-TY650制备的富镁涂层可明显改善涂层对破损处镁合金基体的保护作用,但涂层本身长期防护性能较差;环氧618-T31构成的富镁涂层对AZ91D镁合金的防护作用较强,适宜制备镁合金表面的富镁涂层。3种环氧涂料中加入镁粉颗粒制备的富镁涂层均可对缺陷处裸露的AZ91D镁合金基体提供保护,从而延长漆膜的破坏时间。涂层中的镁粉颗粒被激活后,为镁合金的基体提供了一定程度的阴极保护作用,减缓了镁合金基体的腐蚀。

关键词: 腐蚀, 电化学, 界面, 镁合金, 涂层

Abstract:

The influence of different types of epoxy resins on protection performance of magnesium-rich coating for AZ91D alloy was studied with scratch testing, electrochemical impedance spectroscopy (EIS), open circuit potential (OCP) and dynamic potential scanning. The results indicated that Mg-rich coating consisting of epoxy coating 618-593 showed poor protective performance. Magnesium particles in 6101-TY650 epoxy coating could significantly improve the protective effect for magnesium alloy substrate at the coating defects, however, their over the long-term protection performance was poor. Epoxy 618-T31 coating showed strong barrier properties. Then, the Mg-rich primer consisting of epoxy coating 618-T31 had a strong protective effect, indicating that the epoxy coating 618-T31 was suitable for the preparation of Mg-rich coating for AZ91D alloy. For AZ91D alloy, magnesium particles added in three types of epoxy coatings could provide cathodic protection to AZ91D substrate at coatings defects, prolonging the corrosion life of coatings. Meanwhile, magnesium particles were activated to provide cathodic protection for the magnesium alloy substrate to some extent, retarding the corrosion rate of magnesium alloy substrate.

Key words: corrosion, electrochemistry, interface, magnesium alloy, coating

中图分类号:

TG174.4

卢向雨, 吴静英, 左禹, 郑传波. AZ91D镁合金表面不同树脂体系富镁涂层的保护性能[J]. 化工学报, 2015, 66(11): 4578-4587.

LU Xiangyu, WU Jingying, ZUO Yu, ZHENG Chuanbo. Protection performance of Mg-rich coatings formed by different epoxyresins on AZ91D alloys[J]. CIESC Journal, 2015, 66(11): 4578-4587.

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AZ91D镁合金表面不同树脂体系富镁涂层的保护性能

Protection performance of Mg-rich coatings formed by different epoxyresins on AZ91D alloys

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