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

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-02-21 DOI:10.1016/j.corsci.2025.112795

Yi-Jun Lin, Siao-Ying Chen, Wei-Liang Chien, Zong-Syun Yang, Chao-Sung Lin

引用次数: 0

Abstract

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 ZrF₆^2- 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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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.