Relation between microstructural aspects of AA2024 and its corrosion behaviour investigated using AFM scanning potential technique

Campestrini, P.; Westing, E.P.M. van; Rooijen, H. W. van; Wit, J.H.W. de

doi:10.1016/s0010-938x(00)00002-0

Cited by 198 publications

(106 citation statements)

References 11 publications

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“…This finding is in good agreement with experimental data suggesting that sufficiently small particles are not harmful for the material since they do not cause serious localized corrosion. 6,8,48,49 Further, the model presented also has first-order agreement with experimental observations concerning the effect of particle spacing on the interaction between two particles. When the distance between the two cathodic particles was small enough (a few μm), modelling suggested the local acidification inside the dissolving volume around one cathodic particle may lead to a lower pH in the area between the adjacent particles.…”

Section: Resultssupporting

confidence: 82%

“…The normal component n of velocity vector v of the dissolution surface was calculated by the anodic current density according to Faraday's law: [8] where M is the atomic mass of the corroding metal (assumed to be Al here), Z is the electron charge number, F is the Faraday constant, and ρ is the density of the corroding phase. Note that even though the deposition of Al(OH) 3 is considered mathematically in the present model, Table I.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Simulation of Micro-Galvanic Corrosion in Al Alloys: Effect of Geometric Factors

Yin

Jin

Leygraf

et al. 2017

J. Electrochem. Soc.

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A finite element model for simulating the propagation of intermetallic particle driven micro-galvanic corrosion in an Al-matrix model system is presented. The model revealed dynamic changes related to localized corrosion, including the moving dissolution boundary, the deposition of reaction products (Al(OH) 3 ), and their blocking effect. Modelling was focused on the effects of key geometric parameters, including the radius of cathodic particle (range 0.5 to 4 μm) and the width of an assumed anodic ring surrounding the particle (range 0.1 to 2 μm). Simulations revealed the dynamic flow of molecular and ionic species, along with influence of geometrical constraints. For ring widths below 0.5 μm, deposition of Al(OH) 3 inside the dissolving volume was inhibited due to limited transport of OH − and O 2 into a constrained volume − resulting in local acidification. An increase in cathodic particle radius at given ring width resulted in a greater dissolution by providing a larger cathodic area for O 2 reduction, quantifying the effect of cathode/anode ratio. The model was also developed to include two cathodic particles to explore any interaction. The present study reveals a physicochemical model that contributes toward a framework for multi-process localized corrosion systems, which can be further adapted to commercial alloy systems. The initiation and propagation of different types of localized corrosion are two issues that have been extensively studied for several decades.1-4 An understanding of localized corrosion is important for both corrosion prognosis and corrosion protection. For multi-element alloys with heterogeneous microstructures, local electrochemistry is also heterogeneous, with an attendant risk for localized corrosion when exposed to a corrosive environment. In the case of aluminum (Al) alloys, localized corrosion has been commonly observed to be associated with intermetallic particles (IMPs). [5][6][7][8][9][10][11][12][13][14][15][16] Many alloying additions to Al include more 'noble' elements (i.e. Cu, Fe, Mn, etc.) and such additions leading to IMPs that are termed 'cathodic', resulting in the manifestation of localized corrosion of the alloy matrix surrounding such particles. The imaging of localized corrosion morphologies in a number of Al-alloys has shown that susceptibility and extent of corrosion damage is highly pH dependant. 17,18 Whilst analysis of the morphology of corrosion damage is indeed essential, from the perspective of electrochemical monitoring of localized corrosion, practical limitations of electrochemical measurements make it very difficult to accurately describe the kinetics of the localized corrosion − such as the corrosion induced by heterogeneous microstructures.In response to challenges in directly measuring localized corrosion, recent decades have seen the development of modelling and numerical simulation in the context of rationalising and quantifying the phenomenology of localized corrosion.19-30 Such model can be based on a theoretical analysis of the chemistry and el...

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Section: Resultssupporting

confidence: 82%

Section: Methodsmentioning

confidence: 99%

Numerical Simulation of Micro-Galvanic Corrosion in Al Alloys: Effect of Geometric Factors

Yin

Jin

Leygraf

et al. 2017

J. Electrochem. Soc.

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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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“…Different kinds of coarse intermetallic particles have been identified in AA2024-T3 [6][7][8]. Buchheit reported a compilation of corrosion potentials for aluminum-based intermetallic particles found in the literature [9].…”

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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Relation between microstructural aspects of AA2024 and its corrosion behaviour investigated using AFM scanning potential technique

Cited by 198 publications

References 11 publications

Numerical Simulation of Micro-Galvanic Corrosion in Al Alloys: Effect of Geometric Factors

Numerical Simulation of Micro-Galvanic Corrosion in Al Alloys: Effect of Geometric Factors

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

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

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