Localized corrosion in anodized aluminium alloys: The role of constituent particle-induced defects in anodic films

Joao Victor De Sousa Araujo; Jinghui Chen; Isolda Costa; Xiaorong Zhou

doi:10.1016/j.corsci.2025.112961

Localized corrosion in anodized aluminium alloys: The role of constituent particle-induced defects in anodic films

Joao Victor De Sousa Araujo, Jinghui Chen, Isolda Costa, Xiaorong Zhou

Research output: Contribution to journal › Article › peer-review

Abstract

The influence of defects formed by dissolution of constituent intermetallic particles (IMPs) on the corrosion resistance of anodized aluminium alloys, including AA2024-T3, AA2198-T8, AA2198-T851, and AA7475-T761, is investigated. Localized corrosion initiates cavity defects located at the film/alloy interface, mainly due to the dissolution of high-copper-containing IMPs. In AA2024, Si-containing particle-induced defects also contributed to a reduction in corrosion resistance. Low-copper-containing IMPs in AA7475-T761 alloy, however, do not affect corrosion resistance. The effects of particle density, composition, size, and location on the formation of defects in anodic films and, subsequently, on corrosion resistance of anodized alloys are discussed.

Original language	English
Article number	112961
Journal	Corrosion Science
Volume	252
Early online date	21 Apr 2025
DOIs	https://doi.org/10.1016/j.corsci.2025.112961
Publication status	E-pub ahead of print - 21 Apr 2025

Keywords

High-Strength Aluminium Alloys
Anodizing
Particle-Induced Defects
Corrosion Resistance

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10.1016/j.corsci.2025.112961

AAMAccepted author manuscript, 7.26 MBLicence: CC BY

https://linkinghub.elsevier.com/retrieve/pii/S0010938X25002884

SusCoRD: Sustainable Coatings by Rational Design
Lyon, S. (PI), Burnett, T. (CoI), Curioni, M. (CoI), Pereira Da Fonte, C. (CoI), Siperstein, F. (CoI), Stevens, N. (CoI) & Zhou, X. (CoI)
1/11/18 → 31/10/24
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title = "Localized corrosion in anodized aluminium alloys: The role of constituent particle-induced defects in anodic films",

abstract = "The influence of defects formed by dissolution of constituent intermetallic particles (IMPs) on the corrosion resistance of anodized aluminium alloys, including AA2024-T3, AA2198-T8, AA2198-T851, and AA7475-T761, is investigated. Localized corrosion initiates cavity defects located at the film/alloy interface, mainly due to the dissolution of high-copper-containing IMPs. In AA2024, Si-containing particle-induced defects also contributed to a reduction in corrosion resistance. Low-copper-containing IMPs in AA7475-T761 alloy, however, do not affect corrosion resistance. The effects of particle density, composition, size, and location on the formation of defects in anodic films and, subsequently, on corrosion resistance of anodized alloys are discussed.",

keywords = "High-Strength Aluminium Alloys, Anodizing, Particle-Induced Defects, Corrosion Resistance",

author = "{De Sousa Araujo}, {Joao Victor} and Jinghui Chen and Isolda Costa and Xiaorong Zhou",

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language = "English",

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T1 - Localized corrosion in anodized aluminium alloys: The role of constituent particle-induced defects in anodic films

AU - De Sousa Araujo, Joao Victor

AU - Chen, Jinghui

AU - Costa, Isolda

AU - Zhou, Xiaorong

PY - 2025/4/21

Y1 - 2025/4/21

N2 - The influence of defects formed by dissolution of constituent intermetallic particles (IMPs) on the corrosion resistance of anodized aluminium alloys, including AA2024-T3, AA2198-T8, AA2198-T851, and AA7475-T761, is investigated. Localized corrosion initiates cavity defects located at the film/alloy interface, mainly due to the dissolution of high-copper-containing IMPs. In AA2024, Si-containing particle-induced defects also contributed to a reduction in corrosion resistance. Low-copper-containing IMPs in AA7475-T761 alloy, however, do not affect corrosion resistance. The effects of particle density, composition, size, and location on the formation of defects in anodic films and, subsequently, on corrosion resistance of anodized alloys are discussed.

AB - The influence of defects formed by dissolution of constituent intermetallic particles (IMPs) on the corrosion resistance of anodized aluminium alloys, including AA2024-T3, AA2198-T8, AA2198-T851, and AA7475-T761, is investigated. Localized corrosion initiates cavity defects located at the film/alloy interface, mainly due to the dissolution of high-copper-containing IMPs. In AA2024, Si-containing particle-induced defects also contributed to a reduction in corrosion resistance. Low-copper-containing IMPs in AA7475-T761 alloy, however, do not affect corrosion resistance. The effects of particle density, composition, size, and location on the formation of defects in anodic films and, subsequently, on corrosion resistance of anodized alloys are discussed.

KW - High-Strength Aluminium Alloys

KW - Anodizing

KW - Particle-Induced Defects

KW - Corrosion Resistance

U2 - 10.1016/j.corsci.2025.112961

DO - 10.1016/j.corsci.2025.112961

M3 - Article

SN - 0010-938X

VL - 252

JO - Corrosion Science

JF - Corrosion Science

M1 - 112961

ER -

Localized corrosion in anodized aluminium alloys: The role of constituent particle-induced defects in anodic films

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