The influence of rare earth mercaptoacetate on the initiation of corrosion on AA2024-T3 Part II: The influence of intermetallic compositions within heavily attacked sites

Catubig, Rainier; Hughés, A.E.; Cole, Ivan; Chen, F.F.; MacRae, Colin M.; Wilson, Nicholas C.; Glenn, A.M.; Hinton, Bruce; Forsyth, Maria

doi:10.1016/j.corsci.2015.01.055

Cited by 10 publications

(3 citation statements)

References 37 publications

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“…It is well known that intermetallic (IM) particles in aluminium alloy play an important role in pit initiation [13][14][15]. For example, sites with clustered IM particles are more likely, but not necessarily, to undergo the most severe corrosion attack [16]. Generally, the IM particles can be classified into three categories according to their difference in electrochemical activity, i.e.…”

Section: Introductionmentioning

confidence: 99%

Two years pitting corrosion of AA5005-H34 aluminium alloy immersed in natural seawater: morphology characterisation

Liang

Melchers

2020

Corrosion Engineering, Science and Technology

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Pitting corrosion of aluminium alloy AA5005-H34 immersed in natural sea water for up to 2 years is presented, together with new interpretations of the development of the pitting process over extended exposure periods. Trenching initiated at surface-located Fe-rich intermetallic (IM) particles. It occurred more extensively in sea water compared to atmospheric exposures. With increasing exposures, the pitting morphologies became more complex. Three types, i.e. hemispherical pits (Type 1), crystallographic pits (Type 2) and characteristic 'petal'-like pits (Type 3), were observed after 12 months. It is suggested that the formation of Type 2 and Type 3 pits occurs at an advanced corrosion stage, and are associated with large Fe-rich IM particles near the metal surface. The influence of marine growth on pitting was negligible.

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Section: Introductionmentioning

confidence: 99%

Two years pitting corrosion of AA5005-H34 aluminium alloy immersed in natural seawater: morphology characterisation

Liang

Melchers

2020

Corrosion Engineering, Science and Technology

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“…Their advantage is effectiveness, low toxicity [25,26] and economic competitiveness [27]. Some studies have shown synergy between rare earth salts and organic carboxylate compounds such as salicylate [6,28], cinnamate [29,30], octylthiopropionate [31], dibutyl phosphate [32], hexadecanoate [33], tartrate [34] and mercaptoacetate [35][36][37] in corrosion inhibition.…”

Section: Introductionmentioning

confidence: 99%

Synergistic inhibition of carbon steel corrosion in seawater by cerium chloride and sodium gluconate

et al. 2015

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“…26 More severe corrosion attack occurred at sites where these particles are more clustered together. 27 Our previous study showed an average of five S-phase particles present at heavily corroded sites 28 and that S-phase particles are more likely to have other S-phase particles as neighbours within a 25 μm radius. 29 The interactions between multiple particles on an alloy surface can be simulated by the multielectrode method which consists of more than two electrodes packed in close proximity with each other.…”

mentioning

confidence: 99%

An Al-Cu Multielectrode Model for Studying Corrosion Inhibition with Praseodymium Mercaptoacetate at Intermetallic Particles in AA2024

Catubig¹,

Tan²,

Hughes³

et al. 2021

J. Electrochem. Soc.

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Dealloying of S-phase particles on AA2024-T3 leave behind highly cathodic Cu-rich particles, creating a galvanic corrosion environment. Clustering of these particles intensify localised dissolution of adjacent matrix leading to pitting. Evaluation of such galvanic activities is critical to develop effective corrosion inhibitors. Unfortunately conventional electrochemical methods are unable to probe this type of anodic attack because in principle they only evaluate general corrosion and cannot measure galvanic corrosion currents flowing between particles and adjacent matrix. This work uses a multielectrode composed of four copper and forty-four aluminium electrodes to model galvanic activities occurring over a cluster of dealloyed S-phase particles to better understand localised attack and at clustered sites. The model Al-Cu multielectrode was shown to be an effective tool to investigate local interactions between Cu electrodes and Al electrodes which undergo significant anodic current densities, simulating the anodic attack on the aluminium matrix of AA2024-T3. Additionally this tool can more strictly differentiate between inhibitors for localised corrosion control. An environmentally friendly rare earth corrosion inhibitor, praseodymium mercaptoacetate (Pr(MAcet)3), has been evaluated by this technique and has been found to rapidly reduce anodic current densities at a faster rate than PrCl3 when concentrations were sufficiently high (>10−3 M).

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The influence of rare earth mercaptoacetate on the initiation of corrosion on AA2024-T3 Part II: The influence of intermetallic compositions within heavily attacked sites

Cited by 10 publications

References 37 publications

Two years pitting corrosion of AA5005-H34 aluminium alloy immersed in natural seawater: morphology characterisation

Two years pitting corrosion of AA5005-H34 aluminium alloy immersed in natural seawater: morphology characterisation

Synergistic inhibition of carbon steel corrosion in seawater by cerium chloride and sodium gluconate

An Al-Cu Multielectrode Model for Studying Corrosion Inhibition with Praseodymium Mercaptoacetate at Intermetallic Particles in AA2024

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