An electrochemical investigation of the behaviour of aluminum alloys in different electrolytes

Elboujdaîni, M.; Ghali, Edward; Barradas, R.G.; Girgis, Magdy

doi:10.1016/0010-938x(90)90009-t

Cited by 33 publications

(9 citation statements)

References 14 publications

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“…Moreover, the reactivity of the Al-Cu-Mg particles themselves had to be considered. These particles are known to be very reactive [32][33][34]. They are first anodic to the aluminium matrix and are asso ciated to selective dissolution phenomena leading to a copper enrich ment and then to an inversion of the polarity matrix/particles: the particles become cathodic to the matrix [35].…”

Section: Evolution Of the Alloy Microstructure As A Function Of The Pmentioning

confidence: 99%

Influence of the alloy microstructure and surface state on the protective properties of trivalent chromium coatings grown on a 2024 aluminium alloy

Verdalet-Guardiola

Bonino

Duluard

et al. 2018

Surface and Coatings Technology

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Section: Evolution Of the Alloy Microstructure As A Function Of The Pmentioning

confidence: 99%

Influence of the alloy microstructure and surface state on the protective properties of trivalent chromium coatings grown on a 2024 aluminium alloy

Verdalet-Guardiola

Bonino

Duluard

et al. 2018

Surface and Coatings Technology

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“…Such a value indicates that the passivation process proceeds mainly under diffusion control (Delehay, 1954). Generally, the increase of peak current and potential shifts with sulphate concentration indicates the incorporation of SO 2À 4 anions with zinc oxide lattice during the passivation process (Elboujdaini et al, 1990;Abd El Rehim et al, 1992).…”

Section: Effect Of So Pàmentioning

confidence: 99%

Passivity and passivity breakdown of zinc anode in sulphate solutions

Aal

1999

Anti-Corrosion Methods and Materials

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The electrochemical behaviour of zinc in different concentrations of Na 2 SO 4 (pH = 6.0) was investigated using the potentiodynamic anodic polarization single sweep and cyclic voltammogram techniques. The anodic portion is characterized by one distinct peak corresponding to Zn(OH) 2 or ZnO. This is followed by a passive region up to a certain potential; the passive current suddenly rises steeply without any sign of oxygen evolution. This denotes the breakdown of the passive film and initiation of pitting corrosion. It was found that the breakdown potential depends on the sulphate concentration, type of aeration, scan rate, solution temperature and pH. The pitting initiation may be explained through the adsorption of SO 4 2± anion on the oxide film formed.This decreases the repair efficiency and causes further metal dissolution. From the cyclic voltammogram of zinc in different concentrations of Na 2 SO 4 , it was found that the change in the integrated anodic charge, Áq a , which is taken as a measure of the extent of pitting, varies linearly with concentration of SO 4 2± anion.

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“…Magnesium enrichment of aluminum alloys is known to catalyze the cathodic reaction in deaerated aqueous solutions and result in magnesium incorporation into the oxide form, forming a less stable, porous oxide layer as opposed to .the impervious aluminum oxide film present on pure aluminum (23). Magnesium enrichment of aluminum alloys is known to catalyze the cathodic reaction in deaerated aqueous solutions and result in magnesium incorporation into the oxide form, forming a less stable, porous oxide layer as opposed to .the impervious aluminum oxide film present on pure aluminum (23).…”

Section: Discussionmentioning

confidence: 99%

Corrosion Behavior of a P130x Graphite Fiber Reinforced 6063 Aluminum Composite Laminate in Aqueous Environments

Dutta

Elkin

King

1991

J. Electrochem. Soc.

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The aqueous corrosion behavior of 0/90 cross-plied P130x graphite fiber reinforced 6063 A1 composite laminates was studied in deaerated and aerated aqueous Na2SO4 and NaC1 solutions using immersion and electrochemical techniques. Special emphasis was given to the identification of the principal mechanism(s) of corrosion. It was demonstrated conclusively via microscopic and electrochemical considerations that galvanic attack of the matrix was by far the dominant mechanism of corrosion in both solutions when A1 and graphite are simultaneously exposed. Localized attack of microstructural segregations, if operative, was negligible compared to galvanic corrosion. When graphite is not exposed to the electrolyte, pitting of the surface foil, followed by galvanic attack of the matrix once the pit penetrates to the underlying graphite fibers, was found to be the primary corrosion mechanism. The effects of matrix heat-treatment, solution pH, sulrite ion contamination, and solution aeration on the electrochemical parameters and the overall corrosion behavior in 3.5% NaCI solutions were also studied. In general, the susceptibilities of general, galvanic, and localized corrosion were found to increase at lower pH levels and in the presence of su]fite ion contamination. Progressive aging of the matrix decreased corrosion susceptibility in deaerated solutions, but seemed to increase it in aerated solutions. The impact of each of the above parameters on the electrochemical nature of the various operative corrosion processes has been discussed in detail.) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 130.56.64.29 Downloaded on 2015-03-16 to IP

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An electrochemical investigation of the behaviour of aluminum alloys in different electrolytes

Cited by 33 publications

References 14 publications

Influence of the alloy microstructure and surface state on the protective properties of trivalent chromium coatings grown on a 2024 aluminium alloy

Influence of the alloy microstructure and surface state on the protective properties of trivalent chromium coatings grown on a 2024 aluminium alloy

Passivity and passivity breakdown of zinc anode in sulphate solutions

Corrosion Behavior of a P130x Graphite Fiber Reinforced 6063 Aluminum Composite Laminate in Aqueous Environments

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