Galvanic coupling of model alloys to aluminum — a foundation for understanding particle-induced pitting in aluminum alloys

Liao, Chi-Min; Wei, Robert P.

doi:10.1016/s0013-4686(99)00299-6

Cited by 113 publications

(61 citation statements)

References 20 publications

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“…The EDX O map exhibits the deposition of corrosion products in the periphery of the second phase particle, indicating that attack is concentrated at the intermetallic/matrix interface, resulting in the dissolution of the Al alloy close to the intermetallic. Consequently, in agreement with previous work, the SEM and Auger/EDX results show that the Al-Cu-Fe-Mn intermetallic is cathodic with respect to the matrix [3][4][5].…”

Section: First Intermetallic Groupsupporting

confidence: 92%

“…The major second phase precipitates in these alloys are Al-Cu-Fe-Mn, with a variable composition and size from 1 to 30 µm. Such Al-Cu-Fe-Mn second phase particles are generally accepted to be cathodic with respect to the matrix [3][4][5]. The corrosion behaviour of Al-Cu-Fe-Mn intermetallics has been the subject of several studies on the 2024 alloys, where the Al-Cu-Fe-Mn phase and the S phase have been found.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Localized corrosion of a 2219 aluminium alloy exposed to a 3.5% NaCl solution

Grilli¹,

Baker²,

Castle³

et al. 2010

Corrosion Science

135

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Section: First Intermetallic Groupsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Localized corrosion of a 2219 aluminium alloy exposed to a 3.5% NaCl solution

Grilli¹,

Baker²,

Castle³

et al. 2010

Corrosion Science

135

View full text Add to dashboard Cite

“…However, magnesium and aluminum dissolution promotes the formation of Mg-Al-depleted intermetallic particles which can act cathodically for longer immersion times. Otherwise, Al-Cu-Fe-Mn intermetallic particles constantly interact as cathodes with the aluminum matrix [11][12][13]. The electrochemical behavior of second phase particles is affected by the pH solution and it can become very complex [14].…”

Section: Introductionmentioning

confidence: 99%

Study of the effect of cerium nitrate on AA2024-T3 by means of electrochemical micro-cell technique

Paussa

Andreatta

Rosero-Navarro

et al. 2012

Electrochimica Acta

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t r a c tThis work evaluates the effect of cerium nitrate as corrosion inhibitor for AA2024-T3 in the view of its introduction in sol-gel coatings able to provide self-healing ability. Since it is well established that deposition of Ce species is activated by the local pH increase, the objective of this paper is to investigate the behavior of AA2024-T3 (open circuit potential and polarization curves) in the presence of Ce species in aggressive solutions by means of a local technique, the electrochemical micro-cell. This technique enables the investigation of small areas with resolution in the micrometer range by the use of glass capillaries to define the working electrode area. The micro-cell results clearly displayed that the entire AA2024-T3 area exposed to the ceriumcontaining electrolyte was involved in the cerium precipitation mechanism. The heterogeneous electrochemical behavior of the microstructure is minimized by the formation of a cerium-containing layer able to protect the metal substrate.

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“…Materials such as high-strength aluminum alloys and stainless steel contain numerous constituent particles, which play important roles in corrosion pit formation. Pit shape depends mainly on electrochemical processes in the metal/electrolyte interface and potential distribution inside the cavity (Liao and Wei, 1999;Wang et al, 2001;Perkins and Bache, 2005). Wei (2001) identified that pit growth was controlled by the limiting cathodic current density supported by the exposed constituent/ impurity particles within a growing pit.…”

Section: Introductionmentioning

confidence: 99%

3D analysis for pit evolution and pit-to-crack transition during corrosion fatigue

Huang

2013

J. Zhejiang Univ. Sci. A

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This paper presents a deterministic model to predict the pit evolving morphology and crack initiation life of corrosion fatigue. Based on the semi-ellipsoidal pit assumption, the thermodynamic potential including elastic energy, surface energy and electrochemical energy of the cyclically stressed solid with an evolving pit is established, from which specific parameters that control the pit evolution are introduced and their influence on the pit evolution are evaluated. The critical pit size for crack nucleation is obtained from stress intensity factor criterion and the crack nucleation life is evaluated by Faraday's law. Meanwhile, this paper presents a numerical example to verify the proposed model and investigate the influence of cyclic load on the corrosion fatigue crack nucleation life. The corrosion pit appears approximately as a hemisphere in its early formation, and it gradually transits from semicircle to ellipsoid. The strain energy accelerates the morphology evolution of the pit, while the surface energy decelerates it. The higher the stress amplitude is, the smaller the critical pit size is and the shorter the crack initiation life is.

show abstract

Galvanic coupling of model alloys to aluminum — a foundation for understanding particle-induced pitting in aluminum alloys

Cited by 113 publications

References 20 publications

Localized corrosion of a 2219 aluminium alloy exposed to a 3.5% NaCl solution

Localized corrosion of a 2219 aluminium alloy exposed to a 3.5% NaCl solution

Study of the effect of cerium nitrate on AA2024-T3 by means of electrochemical micro-cell technique

3D analysis for pit evolution and pit-to-crack transition during corrosion fatigue

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