Role of intermetallic phases in localized corrosion of AA5083

Yasakau, K.A.; Zheludkevich, Mikhail L.; Lamaka, Sviatlana V.; Ferreira, M.G.S.

doi:10.1016/j.electacta.2006.12.072

Cited by 290 publications

(187 citation statements)

References 23 publications

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“…Pre-treatment 1 followed by pressurised steam treatment showed inferior corrosion resistance as compared to pre-treatment 2, which can be related to the removal of some intermetallic phases and the better coverage of intermetallic particles at high vapour pressure of steam [38]. The presence of different intermetallic phases in aluminium matrix makes the surface prone to localised corrosion [42][43][44]. Hence the coverage of intermetallic particles with the oxide film results in the enhancement of corrosion resistance of the aluminium alloys.…”

Section: Discussionmentioning

confidence: 99%

Accelerated growth of oxide film on aluminium alloys under steam: Part II: Effects of alloy chemistry and steam vapour pressure on corrosion and adhesion performance

Din

Bordo

Jellesen

et al. 2015

Surface and Coatings Technology

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Section: Discussionmentioning

confidence: 99%

Accelerated growth of oxide film on aluminium alloys under steam: Part II: Effects of alloy chemistry and steam vapour pressure on corrosion and adhesion performance

Din

Bordo

Jellesen

et al. 2015

Surface and Coatings Technology

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“…For particles containing both active and noble elements, such as Al 2 CuMg, the active alloying elements dissolve leaving behind remnants with noble elements such as Cu. This is commonly referred to as dealloying corrosion as shown in Figure 1 [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. Particles consisting primarily of noble elements generally possess a high corrosion potential, and act as a cathode to support the oxygen reduction reaction or hydrogen evolution.…”

Section: Introductionmentioning

confidence: 99%

A Summary of Corrosion Properties of Al-Rich Solid Solution and Secondary Phase Particles in Al Alloys

Dang

2017

Metals

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Abstract:The heterogeneous structure of Al alloys renders them susceptible to localized corrosion due to the different electrochemical properties existing in the Al-rich solid solution matrix and secondary phase particles. The galvanic interactions between these two phases can result in pit formation either through dissolution of the particles or corrosion of the matrix adjacent to the particles. This detrimentally localized corrosion behavior is closely related to the corrosion properties of the particles and the Al-rich matrix. The comprehensive characterization of this behavior under various and varying conditions is critical to understanding the mechanism of pit formation, selecting appropriate inhibitors, and developing protection strategies. The corrosion properties (corrosion potential, pitting potential and corrosion rate) of both secondary phase particles and Al-solid solutions in Al alloys are summarized in this review, aiming to provide a database for corrosion research applicable to the localized corrosion of Al alloys.

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“…7,[14][15][16][17] Many papers assume the dissolution of β phase will occur because its breakdown potential, E b , is lower than the OCP of the alloy.…”

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confidence: 99%

Influence of the Altered Surface Layer on the Corrosion of AA5083

Seong

Yang

Scheltens

et al. 2015

J. Electrochem. Soc.

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The corrosion behavior of sensitized AA5083 in aerated and deaerated 3.5 wt% NaCl solutions has been studied. The results indicated that an altered surface layer (ASL) with a recrystallized microstructure having no β phase at the grain boundaries formed on sensitized AA5083 during polishing. The ASL prevented the exposure of β phase at the surface and its dissolution at the alloy open circuit potential, even though this potential was above the breakdown potential of bulk β phase. Selective dissolution of β phase was observed when a cathodic reaction caused an increase in localized pH near intermetallic particles or after removal of the ASL by etching to expose the grain boundary β phase. The different corrosion behavior of solutionized and sensitized AA5083 was clarified by testing etched samples. Removal of the ASL is therefore necessary to understand the initiation of intergranular corrosion on sensitized AA5083. © The Author(s) 2015. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited. [DOI: 10.1149/2.0321506jes] All rights reserved.Manuscript submitted January 22, 2015; revised manuscript received February 16, 2015. Published February 27, 2015 Lightweight materials that provide good formability, high strengthto-weight ratio, weldability and corrosion resistance are desired for use in automotive and marine industrial and military applications. Wrought AA5XXX Al-Mg alloys are well known for these properties, and in recent years these materials have been used to replace heavier materials.1 However, Al-Mg alloys can be susceptible to intergranular corrosion (IGC) attack and intergranular stress corrosion cracking (IGSCC) because of sensitization, which involves the formation of the anodic β phase (Mg 2 Al 3 ) along the grain boundary. 2-4When an Al-Mg alloy containing more than 3 wt% Mg is exposed to room temperature over long periods of time or an elevated temperature (60∼180• C) over a shorter period of time, supersaturated Mg will diffuse to the grain boundary region and form β phase particles.5 Because the breakdown potential (E b ) of β phase (−0.95 V SCE ) 6 is more negative than the open circuit potential (OCP) of the alloy (−0.78 V SCE ), dissolution of β phase along grain boundaries can occur when the alloy is exposed in a corrosive environment. This phenomenon leads to IGC and also IGSCC when a tensile stress is present.1,7-10 Goswami et al. showed that the hardness of AA5083 gradually decreased with aging time, 10 which indicates removal of the strengthening element Mg from solid solution. Searles et al. found that the ductility of sensitized AA5083 during constant extension rate testing increased when a potential below the pitting potential of β phase was applied to the sample compared to testing at the OCP. 1 Jones et al. showed that the crack growth rates of AA5083 were ...

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Role of intermetallic phases in localized corrosion of AA5083

Cited by 290 publications

References 23 publications

Accelerated growth of oxide film on aluminium alloys under steam: Part II: Effects of alloy chemistry and steam vapour pressure on corrosion and adhesion performance

Accelerated growth of oxide film on aluminium alloys under steam: Part II: Effects of alloy chemistry and steam vapour pressure on corrosion and adhesion performance

A Summary of Corrosion Properties of Al-Rich Solid Solution and Secondary Phase Particles in Al Alloys

Influence of the Altered Surface Layer on the Corrosion of AA5083

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