Effects of multifunction cavitation treatment during chemical conversion coating on compounds formed on AZ31 magnesium alloy surface and their electrochemical characteristics

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2025-05-21 DOI:10.1016/j.surfcoat.2025.132308

Masataka Ijiri , Fumihiro Kato , Toshihiko Yoshimura , Isao Nakatsugawa , Yasumasa Chino , Shoichi Kikuchi

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引用次数: 0

Abstract

We investigated the electrochemical properties of compounds and chlorides in the films formed on the surfaces of Mg alloys using cavitation for phosphating. The compounds formed by this treatment were Mg₃(PO₄)₂ and Mg(OH)₂. In addition, electrochemical measurements and combined cycle tests were carried out to investigate the chloride corrosion resistance of the films formed after surface treatment. Regarding the anodic polarization curves, each surface-treated sample exhibited passivation–depassivation behavior. In cathode polarization curves, the corrosion rate for each surface-treated sample was approximately 1/10 that of the corresponding untreated sample. In the combined cycle test, the amount of surface oxidation caused by chlorides was less for each treated sample than for the corresponding untreated sample. In addition, when droplets containing chlorides were dropped onto a surface and the angle of the droplets that adhered to the surface was measured, the angle for the untreated sample remained constant even after the droplets were dropped several times. However, when several droplets were dropped onto each of the cavitation-treated samples, some areas were highly hydrophobic and some areas were less hydrophobic than the untreated samples. The results revealed that, although the coating formed on Mg alloys by phosphating using cavitation showed a protective effect in the early stages when chlorides were attached, the protective effect decreased over time.

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化学转化涂层中多功能空化处理对AZ31镁合金表面形成的化合物及其电化学特性的影响

研究了空化磷化镁合金表面形成的膜中化合物和氯化物的电化学性能。经此处理形成的化合物为Mg3(PO4)2和Mg(OH)2。此外，还进行了电化学测试和联合循环试验，考察了表面处理后形成的膜的耐氯腐蚀性能。在阳极极化曲线上，各表面处理样品均表现出钝化-脱钝化行为。在阴极极化曲线上，每个表面处理样品的腐蚀速率约为未处理样品的1/10。在联合循环试验中，每个处理过的样品由氯化物引起的表面氧化量都小于相应的未处理样品。此外，将含有氯化物的液滴滴到表面上，测量液滴粘附在表面上的角度，即使滴下几次，未处理样品的角度也保持不变。然而，当几个液滴滴在每个空化处理的样品上时，有些区域比未处理的样品高度疏水，有些区域比未处理的样品疏水。结果表明，空化磷化在镁合金表面形成的保护层在初期具有一定的保护作用，但随着时间的推移，保护层的保护作用逐渐减弱。

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

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.