Control of structure and corrosion performance in PEO coatings on AZ91/Ti composites: influence of electrolyte composition

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics Pub Date : 2025-05-07 DOI:10.1016/j.matchemphys.2025.130995

Jinchao Jiao , Yongrui Gu , Xiaoyun Ding , Jinghan Yang , Menghui Cui , Yong Lian , Jin Zhang , Kaihong Zheng , Fusheng Pan

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引用次数: 0

Abstract

The reinforcement phases in magnesium matrix composites (MMCs) may negatively impact the discharge behavior and corrosion resistance of PEO coatings, posing challenges to their application. This study investigates the PEO of AZ91/Ti composites in mixed electrolytes with varying compositions. It focuses on optimizing the coating phase composition to regulate the electrical structure and discharge behavior. These improvements ultimately improve the coating structure and performance. The results demonstrate that PEO treatment in mixed electrolytes containing silicates, phosphates, and aluminates produces a dense, self-sealing coating structure, significantly reducing the self-corrosion current density by an order of magnitude. Specifically, the presence of aluminates promotes the formation of an insulating layer on Ti reinforcement phase regions and facilitates the generation of Al₂TiO₅. Meanwhile, phosphates enhance MgO content in the Ti reinforcement phase regions, promoting the formation of MgTiO₃. The synergistic effect of low-dielectric-constant phases, Al₂TiO₅ and MgTiO₃, reduces discharge intensity in Ti reinforcement phase areas, resulting in a dense and self-sealing pore coating structure with improved corrosion resistance.

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AZ91/Ti复合材料PEO涂层结构与腐蚀性能的控制：电解液组成的影响

镁基复合材料（MMCs）中的增强相会对PEO涂层的放电性能和耐腐蚀性产生负面影响，给其应用带来了挑战。本文研究了AZ91/Ti复合材料在不同成分混合电解质中的PEO。重点是优化涂层相组成，以调节电学结构和放电行为。这些改进最终改善了涂层的结构和性能。结果表明，在含有硅酸盐、磷酸盐和铝酸盐的混合电解质中，PEO处理产生了致密的自密封涂层结构，显著降低了自腐蚀电流密度一个数量级。具体来说，铝酸盐的存在促进了Ti增强相区域上绝缘层的形成，有利于Al2TiO5的生成。同时，磷酸盐提高了Ti增强相区MgO的含量，促进了MgTiO3的形成。低介电常数相Al2TiO5和MgTiO3的协同作用降低了Ti增强相区域的放电强度，形成致密的自密封孔涂层结构，提高了耐腐蚀性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Chemistry and Physics 工程技术-材料科学：综合

CiteScore

8.70

自引率

4.30%

发文量

1515

审稿时长

69 days

期刊介绍： Materials Chemistry and Physics is devoted to short communications, full-length research papers and feature articles on interrelationships among structure, properties, processing and performance of materials. The Editors welcome manuscripts on thin films, surface and interface science, materials degradation and reliability, metallurgy, semiconductors and optoelectronic materials, fine ceramics, magnetics, superconductors, specialty polymers, nano-materials and composite materials.