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

LU Xiangyu; WU Jingying; ZUO Yu; ZHENG Chuanbo

doi:10.11949/j.issn.0438-1157.20150542

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

更新时间：2025-12-10

- Protection performance of Mg-rich coatings formed by different epoxyresins on AZ91D alloys
- CIESC Journal Issue 11, Pages: 4578-4587(2015)
- 作者机构：
  
  1. 江苏科技大学材料科学与工程学院,江苏,镇江,212003
  2. 材料腐蚀与防护四川省重点实验室,四川,自贡,643000
  3. 北京化工大学材料科学与工程学院,北京,100029
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20150542
  CLC： G174.4
- Online First：05 November 2015，
  
  Published：05 November 2015
- 稿件说明：
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LU Xiangyu, WU Jingying, ZUO Yu, et al. Protection performance of Mg-rich coatings formed by different epoxyresins on AZ91D alloys[J]. CIESC Journal, 2015, (11): 4578-4587.
DOI：

LU Xiangyu, WU Jingying, ZUO Yu, et al. Protection performance of Mg-rich coatings formed by different epoxyresins on AZ91D alloys[J]. CIESC Journal, 2015, (11): 4578-4587. DOI： 10.11949/j.issn.0438-1157.20150542.

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。

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.

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