Corrosion Evolution Behavior of Ti/Zr/Oligomeric Epoxy Silane Composite Chemical Conversion Coatings on Multi-metals

IF 3.9 2区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Acta Metallurgica Sinica-English Letters Pub Date : 2025-03-22 DOI:10.1007/s40195-025-01842-0

Yunhu Ding, Yingpeng Li, Hongfang Liu, Wenhao Wang, Yijun Wei, Haitao Duan, Wen Zhan

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Abstract

The new energy vehicle body composed of multi-metals requires a synchronous chemical conversion coating to exhibit excellent corrosion resistance. Herein, we prepared a titanium/zirconium/water-based oligomeric epoxy silane composite chemical conversion coating on multi-metals, and conducted an investigation into its electrochemical behavior and micro-zone structural characteristics upon immersion in a 3.5% NaCl solution. The electrochemical results combined with characterization results revealed that the corrosion evolution characteristics of the composite coatings could be categorized into three stages of mild corrosion, synergistic protection, and substrate damage. Besides, Si–OH groups interact with Me–OH at the defect on the multi-metal surface to form an organic monolayer coating. This organic monolayer coating, in conjunction with the synergistic inorganic conversion layer comprising Al₂O₃, TiO₂·2H₂O, ZrO₂·2H₂O, effectively cooperates with the corrosion products to hinder the erosion by the corrosive medium and suppresses the progression of the anodic reaction.

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Ti/Zr/低聚环氧硅烷复合化学转化涂层对多种金属的腐蚀演化行为

由多种金属组成的新能源汽车车身需要同步化学转化涂层，以表现出优异的耐腐蚀性。本文制备了一种钛/锆/水基低聚环氧硅烷复合多金属化学转化涂层，并对其在3.5% NaCl溶液中浸泡后的电化学行为和微区结构特性进行了研究。电化学结果与表征结果相结合表明，复合涂层的腐蚀演化特征可分为轻度腐蚀、协同保护和基体损伤三个阶段。此外，Si-OH基团与Me-OH在多金属表面缺陷处相互作用，形成有机单层涂层。该有机单层涂层结合由Al2O3、TiO2·2H2O、ZrO2·2H2O组成的协同无机转化层，有效地与腐蚀产物协同作用，阻碍腐蚀介质的侵蚀，抑制阳极反应的进行。

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来源期刊

Acta Metallurgica Sinica-English Letters METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

6.60

自引率

14.30%

发文量

122

审稿时长

2 months

期刊介绍： This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.