{"title":"The Effect of Silicon in an Aluminum Alloy on the Composition and Structure of Coatings Formed by Microarc Oxidation","authors":"N. Yu. Dudareva, V. M. Sitdikov","doi":"10.1134/S1027451025700351","DOIUrl":null,"url":null,"abstract":"<p>The paper considers the effect of silicon in aluminum alloys on the structure, phase composition, and properties of coatings obtained by microarc oxidation. The research was carried out on samples made of eutectic aluminum alloy AK12ph (∼12% Si) and foreign hypereutectic aluminum alloy M244 (∼26% Si). The coatings were formed by microarc oxidation in a silicate-alkali electrolyte on a capacitive installation in the same technological mode for all samples. The thickness, porosity, phase composition, and crystallite sizes were determined for the formed coatings. Experimental dataset showed that silicon in an aluminum alloy contributes to the formation of coatings with greater thickness and high porosity. The coating thickness on the M244 alloy is ∼273 μm, which is 1.43 times greater than that of the coating on the AK12ph alloy. The macroporosity of the coatings on the M244 alloy is also high (∼29%), which is 4.8 times higher than that of the coating on the AK12ph alloy. The proportion of nanoscale pores with a diameter of less than 100 nm was determined from the high-magnification photograph of coating sections. The coating on the M244 alloy has a sufficiently high nanoscale porosity of 15.3%, which is 2.6 times higher than on the AK12ph alloy. X-ray phase analysis showed that silicon in an aluminum alloy increases the proportion of aluminosilicates (mullite and sillimanite) in the coating, the amounts of which in the coating on the M244 alloy reaches 76%, which is 1.3 times more than that of the coating on the AK12ph alloy. Aluminosilicate phases contribute to reducing the microhardness of the coatings. The results of this study demonstrate the possibility of controlling the structure and properties of coatings by changing the chemical composition of aluminum alloys subjected to microarc oxidation.</p>","PeriodicalId":671,"journal":{"name":"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques","volume":"19 1","pages":"256 - 265"},"PeriodicalIF":0.4000,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques","FirstCategoryId":"1085","ListUrlMain":"https://link.springer.com/article/10.1134/S1027451025700351","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"PHYSICS, CONDENSED MATTER","Score":null,"Total":0}
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Abstract
The paper considers the effect of silicon in aluminum alloys on the structure, phase composition, and properties of coatings obtained by microarc oxidation. The research was carried out on samples made of eutectic aluminum alloy AK12ph (∼12% Si) and foreign hypereutectic aluminum alloy M244 (∼26% Si). The coatings were formed by microarc oxidation in a silicate-alkali electrolyte on a capacitive installation in the same technological mode for all samples. The thickness, porosity, phase composition, and crystallite sizes were determined for the formed coatings. Experimental dataset showed that silicon in an aluminum alloy contributes to the formation of coatings with greater thickness and high porosity. The coating thickness on the M244 alloy is ∼273 μm, which is 1.43 times greater than that of the coating on the AK12ph alloy. The macroporosity of the coatings on the M244 alloy is also high (∼29%), which is 4.8 times higher than that of the coating on the AK12ph alloy. The proportion of nanoscale pores with a diameter of less than 100 nm was determined from the high-magnification photograph of coating sections. The coating on the M244 alloy has a sufficiently high nanoscale porosity of 15.3%, which is 2.6 times higher than on the AK12ph alloy. X-ray phase analysis showed that silicon in an aluminum alloy increases the proportion of aluminosilicates (mullite and sillimanite) in the coating, the amounts of which in the coating on the M244 alloy reaches 76%, which is 1.3 times more than that of the coating on the AK12ph alloy. Aluminosilicate phases contribute to reducing the microhardness of the coatings. The results of this study demonstrate the possibility of controlling the structure and properties of coatings by changing the chemical composition of aluminum alloys subjected to microarc oxidation.
期刊介绍：
Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques publishes original articles on the topical problems of solid-state physics, materials science, experimental techniques, condensed media, nanostructures, surfaces of thin films, and phase boundaries: geometric and energetical structures of surfaces, the methods of computer simulations; physical and chemical properties and their changes upon radiation and other treatments; the methods of studies of films and surface layers of crystals (XRD, XPS, synchrotron radiation, neutron and electron diffraction, electron microscopic, scanning tunneling microscopic, atomic force microscopic studies, and other methods that provide data on the surfaces and thin films). Articles related to the methods and technics of structure studies are the focus of the journal. The journal accepts manuscripts of regular articles and reviews in English or Russian language from authors of all countries. All manuscripts are peer-reviewed.
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