A MnO2-ZrO2 composite conversion coating to enhance. the corrosion resistance of WE43-T5 Mg alloys

被引：0
作者：
Lin, Yi-Jun [1 ]
Chen, Siao-Ying [1 ]
Chien, Wei-Liang [1 ]
Yang, Zong-Syun [1 ]
Lin, Chao-Sung [1 ]
机构：
[1] Natl Taiwan Univ, Dept Mat Sci & Engn, 1 Roosevelt Rd,Sect 4, Taipei 106, Taiwan
来源：
CORROSION SCIENCE | 2025年 / 248卷
关键词：
A; magnesium; A. rare-earth elements; B; STEM; C. galvanic coupling; C. conversion coating; ELECTRICAL CONTACT RESISTANCE; MAGNESIUM ALLOYS; MICROSTRUCTURE; PRECIPITATION; MECHANISM; BEHAVIOR; ND;
D O I：
10.1016/j.corsci.2025.112795
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Permanganate conversion coating, a potential alternative to chromate conversion coating, was employed on WE43-T5 Mg alloys. A continuous MnO2/Mg(OH)2 coating was observed on the Mg matrix and micrometric second-phase particles (Mg24Y5, Zr-rich particle). In contrast, no coating formed at grain boundaries, and prolonged immersion resulted in cracks within the grains. These defects were detrimental to the corrosion resistance. A second treatment in ZrF62-solution healed these defects via ZrO2 precipitation. This MnO2/ZrO2 composite coating efficiently enhanced the corrosion in 3.5 wt% NaCl, including reduced corrosion current density and corrosion area ratio, and escalated breakdown potential and total impedance.
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页数：16
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