Promoted anodizing reaction and enhanced coating performance of Al-11Si alloy: The role of an equal-channel-angular-pressed substrate

Zhikai Zhou; Dan Song; Ningning Liang; Haiyang Jiang; Bo Gao; Yuna Wu; Aibin Ma; Yanxin Qiao; Jiapeng Sun; Jinghua Jiang; Xiaolong Ma

doi:10.3390/ma12193255

Promoted anodizing reaction and enhanced coating performance of Al-11Si alloy: The role of an equal-channel-angular-pressed substrate

Zhikai Zhou, Dan Song^*, Ningning Liang, Haiyang Jiang, Bo Gao, Yuna Wu, Aibin Ma, Yanxin Qiao, Jiapeng Sun, Jinghua Jiang^*, Xiaolong Ma^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

11 Citations (Scopus)

Abstract

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.

Original language	English
Article number	3255
Journal	Materials
Volume	12
Issue number	19
Online published	5 Oct 2019
DOIs	https://doi.org/10.3390/ma12193255
Publication status	Published - Oct 2019
Externally published	Yes

Research Keywords

Al-Si alloy
Anodizing coating
Corrosion resistance
ECAPed substrate
Microstructure

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title = "Promoted anodizing reaction and enhanced coating performance of Al-11Si alloy: The role of an equal-channel-angular-pressed substrate",

abstract = "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.",

keywords = "Al-Si alloy, Anodizing coating, Corrosion resistance, ECAPed substrate, Microstructure",

author = "Zhikai Zhou and Dan Song and Ningning Liang and Haiyang Jiang and Bo Gao and Yuna Wu and Aibin Ma and Yanxin Qiao and Jiapeng Sun and Jinghua Jiang and Xiaolong Ma",

year = "2019",

month = oct,

doi = "10.3390/ma12193255",

language = "English",

volume = "12",

journal = "Materials",

issn = "1996-1944",

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TY - JOUR

T1 - Promoted anodizing reaction and enhanced coating performance of Al-11Si alloy

T2 - The role of an equal-channel-angular-pressed substrate

AU - Zhou, Zhikai

AU - Song, Dan

AU - Liang, Ningning

AU - Jiang, Haiyang

AU - Gao, Bo

AU - Wu, Yuna

AU - Ma, Aibin

AU - Qiao, Yanxin

AU - Sun, Jiapeng

AU - Jiang, Jinghua

AU - Ma, Xiaolong

PY - 2019/10

Y1 - 2019/10

N2 - 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.

AB - 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.

KW - Al-Si alloy

KW - Anodizing coating

KW - Corrosion resistance

KW - ECAPed substrate

KW - Microstructure

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U2 - 10.3390/ma12193255

DO - 10.3390/ma12193255

M3 - RGC 21 - Publication in refereed journal

C2 - 31590409

SN - 1996-1944

VL - 12

JO - Materials

JF - Materials

IS - 19

M1 - 3255

ER -

Promoted anodizing reaction and enhanced coating performance of Al-11Si alloy: The role of an equal-channel-angular-pressed substrate

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