Effect of particle size and concentration of Al2O3 on the corrosion behavior of silane-Al2O3/MWCNT double-layer coating: towards protecting the AZ91 magnesium alloy
{"title":"Effect of particle size and concentration of Al2O3 on the corrosion behavior of silane-Al2O3/MWCNT double-layer coating: towards protecting the AZ91 magnesium alloy","authors":"Mohammad Reza Tohidifar","doi":"10.1007/s10971-024-06414-9","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The current research reports the influence of particle size and concentration of Al<sub>2</sub>O<sub>3</sub> additive on protective performance of double-layer coating of silane /multi-walled carbon nanotube (MWCNT) deposited on AZ91 magnesium alloy through sol-gel dip coating. The main objective of Al<sub>2</sub>O<sub>3</sub> incorporation to the base silica is to seal different types of defects in the coating and increase the surface hardness, anti-wear, and anticorrosion properties of the coatings which can be beneficial for real-world applications of AZ91 magnesium alloy in industries such as automotive, aircraft, and aerospace. For this purpose, several coatings with different Al<sub>2</sub>O<sub>3</sub> contents of various sizes (50 nm, 100 nm, 300 nm, and 1 μm) were deposited on AZ91 magnesium alloy with thicknesses of about 5–10 µm. It was found that the optimal Al<sub>2</sub>O<sub>3</sub> contents depend on their particle size; such that 1.5, 2, 3, and 5 wt% of Al<sub>2</sub>O<sub>3</sub> were determined as the optimal values for particle sizes of 50, 100, 300, and 1000 nm, respectively. Results revealed that incorporation of an optimal amount of Al<sub>2</sub>O<sub>3</sub> into double-layer coating improved the corrosion resistance where, the polarization resistance of the coatings containing the optimal contents of Al<sub>2</sub>O<sub>3</sub> with particle sizes of 50 nm, 100 nm, 300 nm, and 1 μm were 360.1, 265.3, 240.8, and 157.2 kΩ.cm<sup>2</sup>, respectively. Moreover, the coating comprising 1.5 wt% Al<sub>2</sub>O<sub>3</sub> with a particle size of 50 nm exhibited denser, finer, and lower porosity.</p><h3 data-test=\"abstract-sub-heading\">Graphical Abstract</h3>","PeriodicalId":664,"journal":{"name":"Journal of Sol-Gel Science and Technology","volume":null,"pages":null},"PeriodicalIF":2.3000,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Sol-Gel Science and Technology","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1007/s10971-024-06414-9","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}
引用次数: 0
Abstract
The current research reports the influence of particle size and concentration of Al2O3 additive on protective performance of double-layer coating of silane /multi-walled carbon nanotube (MWCNT) deposited on AZ91 magnesium alloy through sol-gel dip coating. The main objective of Al2O3 incorporation to the base silica is to seal different types of defects in the coating and increase the surface hardness, anti-wear, and anticorrosion properties of the coatings which can be beneficial for real-world applications of AZ91 magnesium alloy in industries such as automotive, aircraft, and aerospace. For this purpose, several coatings with different Al2O3 contents of various sizes (50 nm, 100 nm, 300 nm, and 1 μm) were deposited on AZ91 magnesium alloy with thicknesses of about 5–10 µm. It was found that the optimal Al2O3 contents depend on their particle size; such that 1.5, 2, 3, and 5 wt% of Al2O3 were determined as the optimal values for particle sizes of 50, 100, 300, and 1000 nm, respectively. Results revealed that incorporation of an optimal amount of Al2O3 into double-layer coating improved the corrosion resistance where, the polarization resistance of the coatings containing the optimal contents of Al2O3 with particle sizes of 50 nm, 100 nm, 300 nm, and 1 μm were 360.1, 265.3, 240.8, and 157.2 kΩ.cm2, respectively. Moreover, the coating comprising 1.5 wt% Al2O3 with a particle size of 50 nm exhibited denser, finer, and lower porosity.
期刊介绍：
The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.
京公网安备 11010802042870号
京ICP备2023020795号-1
分享
求助内容：
应助结果提醒方式：
扫码关注我们
