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Microstructural and corrosion characteristics of coatings on SiC/2009 aluminum matrix composites fabricated via plasma electrolytic oxidation: Variation with Zr4+ concentration.

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Title: Microstructural and corrosion characteristics of coatings on SiC/2009 aluminum matrix composites fabricated via plasma electrolytic oxidation: Variation with Zr4+ concentration.
Authors: Li, Zhanpeng1,2 (AUTHOR), Ma, Guofeng1 (AUTHOR) guofma@163.com, Wang, Ziyao1,3 (AUTHOR) wzy@syu.edu.cn, Wang, Jiahao2 (AUTHOR), Sun, Yuan1,4 (AUTHOR) yuansun@imr.ac.cn, Kou, Ronghui2 (AUTHOR), Ren, Shengtao2 (AUTHOR)
Source: Ceramics International. Aug2025:Part A, Vol. 51 Issue 20, p30669-30683. 15p.
Subject Terms: *COMPOSITE coating, *ELECTROLYTIC oxidation, *ELECTROLYTIC corrosion, *ALUMINUM oxidation, *X-ray diffraction, *SURFACE coatings, *CAVITATION erosion
Abstract: Plasma electrolytic oxidation was utilized to prepare ZrO 2 -Al 2 O 3 -SiO 2 composite coatings on the surface of SiC/2009 aluminum matrix composites. The effect of Zr4+ concentration on the microstructure of the coatings was investigated by SEM, AFM, EDS, XRD, and XPS techniques. The electrochemical corrosion behavior, long-term exposure corrosion behavior, and cavitation corrosion behavior were explored in a 3.5 wt% NaCl corrosion solution. The results showed that the surface quality of the coatings was improved by the addition of K 2 ZrF 6. The thickness of the coatings gradually increased with the increasing amount of K 2 ZrF 6 added. At an addition level of 6 g/L, the coatings possessed the smallest porosity and pore size, and were the most uniform. The successful participation of Zr4+ in the reaction was confirmed. The coatings were mainly composed of α-Al 2 O 3 , γ-Al 2 O 3 and Mullite. When K 2 ZrF 6 was added at 6 g/L, the coatings demonstrated the highest corrosion resistance and improved durability upon long-term exposure. The formation mechanism of the composite coatings and their corrosion behavior are also discussed in detail. [ABSTRACT FROM AUTHOR]
Database: Academic Search Index
Description
Abstract:Plasma electrolytic oxidation was utilized to prepare ZrO 2 -Al 2 O 3 -SiO 2 composite coatings on the surface of SiC/2009 aluminum matrix composites. The effect of Zr4+ concentration on the microstructure of the coatings was investigated by SEM, AFM, EDS, XRD, and XPS techniques. The electrochemical corrosion behavior, long-term exposure corrosion behavior, and cavitation corrosion behavior were explored in a 3.5 wt% NaCl corrosion solution. The results showed that the surface quality of the coatings was improved by the addition of K 2 ZrF 6. The thickness of the coatings gradually increased with the increasing amount of K 2 ZrF 6 added. At an addition level of 6 g/L, the coatings possessed the smallest porosity and pore size, and were the most uniform. The successful participation of Zr4+ in the reaction was confirmed. The coatings were mainly composed of α-Al 2 O 3 , γ-Al 2 O 3 and Mullite. When K 2 ZrF 6 was added at 6 g/L, the coatings demonstrated the highest corrosion resistance and improved durability upon long-term exposure. The formation mechanism of the composite coatings and their corrosion behavior are also discussed in detail. [ABSTRACT FROM AUTHOR]
ISSN:02728842
DOI:10.1016/j.ceramint.2025.04.260