Electroless ZnO Deposition on Mg-Al Alloy for Improved Corrosion Resistance to Marine Environments

IF 2.9 3区 材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS
Coatings Pub Date : 2024-09-15 DOI:10.3390/coatings14091192
Luis Chávez, Lucien Veleva, Andrea Castillo-Atoche
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Abstract

Electroless ZnO (≈900 nm) was deposited on the surface of an Mg-Al alloy (AM60) to reduce its degradation in the marine environment. Uncoated and coated ZnO samples were exposed to an SME simulated marine solution for up to 30 days. The AFM and optical images revealed that the corrosion attack on the ZnO-AM60 surface was reduced due to an increase in the surface hydrophobicity of the ZnO coating (contact angle of ≈91.6°). The change in pH to more alkaline values over time was less pronounced for ZnO-AM60 (by ≈13%), whereas the release of Mg2+ ions was reduced by 34 times, attributed to the decrease in active sites on the Mg-matrix provided by the electroless ZnO coating. The OCP (free corrosion potential) of ZnO-AM60 shifted towards less negative values of ≈100 mV, indicating that electroless ZnO may serve as a good barrier for AM60 in a marine environment. The calculated polarization resistance (Rp), based on EIS data, was ≈3 times greater for ZnO-AM60 than that of the uncoated substrate.
在镁铝合金上沉积氧化锌以提高海洋环境耐腐蚀性能
在镁铝合金(AM60)表面沉积了无电解氧化锌(≈900 nm),以减少其在海洋环境中的降解。未涂层和涂层 ZnO 样品暴露在 SME 模拟海洋溶液中长达 30 天。原子力显微镜和光学图像显示,由于 ZnO 涂层表面疏水性的增加(接触角≈91.6°),ZnO-AM60 表面的腐蚀侵蚀减少了。随着时间的推移,ZnO-AM60 的 pH 值向更高的碱性值变化不太明显(≈13%),而 Mg2+ 离子的释放量则减少了 34 倍,这归因于无电解 ZnO 涂层在 Mg 基质上提供的活性位点的减少。ZnO-AM60 的 OCP(自由腐蚀电位)向≈100 mV 的较低负值移动,表明无电解 ZnO 可在海洋环境中对 AM60 起良好的阻挡作用。根据 EIS 数据计算得出的极化电阻 (Rp) 是 ZnO-AM60 未涂层基底的≈3 倍。
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
Coatings
Coatings Materials Science-Surfaces, Coatings and Films
CiteScore
5.00
自引率
11.80%
发文量
1657
审稿时长
1.4 months
期刊介绍: Coatings is an international, peer-reviewed open access journal of coatings and surface engineering. It publishes reviews, research articles, communications and technical notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. Full experimental and/or methodical details must be provided. There are, in addition, unique features of this journal: * manuscripts regarding research proposals and research ideas will be particularly welcomed * electronic files or software regarding the full details of the calculation and experimental procedure - if unable to be published in a normal way - can be deposited as supplementary material
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