Protective polysiloxane films on MgLi alloy by PECVD: Optimized oxygen flow rate to obtain highly anti-corrosion properties

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

Surface & Coatings Technology Pub Date : 2024-11-23 DOI:10.1016/j.surfcoat.2024.131589

Xuyue Yao , Dexin Chen , Zhong Alan Li , Zhentao Yu

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引用次数: 0

Abstract

The high corrosivity of MgLi alloy limits its wide application in maritime, aerospace, electronic device, etc. Therefore, there is an urgent need for an efficient coating to effectively protect it. In this study, hexamethyldisiloxane (HMDSO) was utilized as a precursor to deposit polysiloxane films on MgLi alloy using Plasma Enhanced Chemical Vapor Deposition (PECVD) technology, aimed at improving surface properties and enhancing corrosion resistance. By adjusting the O₂ flow rate, a series of films with different properties were prepared, and their structures were transitioned from organic (SiO_xC_yH_z) to inorganic (SiO_x). The test results showed that different O₂ flow rates led to different deposition rates, the film thickness initially increased and then decreased. With the increase in O₂ flow rate, the content of O element in the film gradually increases, the molecular chain extension of the film increases the crosslinking degree, which changes the mechanical properties and wettability. Electrochemical tests showed that the corrosion current density of the coated MgLi alloy is decreased by 5 orders of magnitude compared to the bare MgLi alloy. Additionally, in the voltage corrosion test at 10 V, the film showed good endurance against current breakdown, and the film surface was not damaged after 2 min of test.

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通过 PECVD 在镁锂合金上形成聚硅氧烷保护膜：优化氧气流速以获得高抗腐蚀性能

镁锂合金的高腐蚀性限制了它在航海、航空航天、电子设备等领域的广泛应用。因此，迫切需要一种有效的涂层来对其进行有效保护。本研究以六甲基二硅氧烷（HMDSO）为前驱体，采用等离子体增强化学气相沉积（PECVD）技术在镁锂合金上沉积聚硅氧烷薄膜，旨在改善其表面性能并增强其耐腐蚀性。通过调节氧气流速，制备了一系列不同性质的薄膜，其结构也从有机（SiOxCyHz）过渡到无机（SiOx）。测试结果表明，不同的氧气流速会导致不同的沉积速率，薄膜厚度先增加后减小。随着氧气流速的增加，薄膜中 O 元素的含量逐渐增加，薄膜分子链的延伸增加了交联度，从而改变了机械性能和润湿性。电化学测试表明，涂层镁锂合金的腐蚀电流密度比裸镁锂合金降低了 5 个数量级。此外，在 10 V 的电压腐蚀测试中，薄膜显示出良好的耐电流击穿性能，测试 2 分钟后薄膜表面未受损。

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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.