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Open AccessArticle

Promoted Anodizing Reaction and Enhanced Coating Performance of Al–11Si Alloy: The Role of an Equal-Channel-Angular-Pressed Substrate

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College of Mechanics and Materials, Hohai University, Nanjing 210098, China
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Suqian Research Institute of Hohai University, Suqian 223800, China
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School of Material Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
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School of Metallurgy and Materials Engineering, Jiangsu University of Science and Technology, Zhenjiang 215600, China
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Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77845, USA
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Authors to whom correspondence should be addressed.
Materials 2019, 12(19), 3255; https://doi.org/10.3390/ma12193255
Received: 14 September 2019 / Revised: 2 October 2019 / Accepted: 3 October 2019 / Published: 5 October 2019
(This article belongs to the Special Issue Advanced Surface Treatment Technologies for Metallic Alloys)
In this paper, the effect of the equal-channel-angular-pressed (ECAPed) substrate on the coating formation and anticorrosion performance of the anodized Al–11Si alloy was systematically investigated. The ECAP process dramatically refines both Al and Si phases of the alloy. The parallel anodizing circuit is designed to enable a comparative study of anodizing process between the cast and the ECAPed alloys by tracking their respective anodizing current quota. The optimum coatings of both alloys were obtained after anodization for 30 min. The ECAPed alloy attained a thicker, more compact, and more uniform coating. Energetic crystal defects in the fine Al grains of the ECAPed substrate promote the anodizing reaction and lead to the thicker coating. Fragmented and uniformly distributed fine Si particles in the ECAPed alloy effectively suppress the coating cracks, enhancing the compactness of the coating. Overall, the ECAP-coated sample exhibits the best anticorrosion performance, which is evidenced by the concurrently enhanced prevention of coating and improved corrosion resistance of the substrate. View Full-Text
Keywords: anodizing coating; ECAPed substrate; microstructure; corrosion resistance; Al–Si alloy anodizing coating; ECAPed substrate; microstructure; corrosion resistance; Al–Si alloy
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MDPI and ACS Style

Zhou, Z.; Song, D.; Liang, N.; Jiang, H.; Gao, B.; Wu, Y.; Ma, A.; Qiao, Y.; Sun, J.; Jiang, J.; Ma, X. Promoted Anodizing Reaction and Enhanced Coating Performance of Al–11Si Alloy: The Role of an Equal-Channel-Angular-Pressed Substrate. Materials 2019, 12, 3255.

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