Influence of quench delay time on the corrosion behavior of aluminium alloy 2024

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

doi:10.1002/1521-4176(200009)51:9<616::aid-maco616>3.0.co;2-8

Cited by 14 publications

(4 citation statements)

References 3 publications

(3 reference statements)

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“…Surface morphology and microstructure.-As-received.-In agreement with the literature [33][34][35][36] and our previous results 37 the microstructure of AA2024 is characterized by the presence of two main types of IMCs ͑Fig. 1a͒: the round-shaped Al-Cu-Mg IMCs ͑named hereafter IMC 1 ) and the Al-Cu-Mn-Fe-Si containing IMCs ͑named hereafter IMC 2 ), which are characterized by an irregular shape and a larger size in comparison with IMC 1 .…”

Section: Resultssupporting

confidence: 88%

Chromate Conversion Coating on Aluminum Alloys

Campestrini¹,

Terryn

Vereecken

et al. 2004

J. Electrochem. Soc.

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By means of the combined use of scanning electron microscopy, energy dispersive spectroscopy, and atomic force microscopy in the Kelvin probe mode the mechanism of the chromate conversion coating ͑CCC͒ formation, discussed in the first part of the paper, was extended to the case of AA2024, taking into account the effect of the intermetallics ͑IMCs͒. It was found that the cathodic IMCs play a fundamental role during the nucleation of the CCC, since they act as preferential nucleation sites. Besides, the influence of the surface preparation procedure was also considered. The use of an acid pickling treatment prior to the chromate process was shown to strongly affect the growth of the CCC, since it results in the formation on the AA2024 surface of a copper-rich smut, which inhibits the chromate reduction reaction. Both IMCs and copper deposits negatively affect the CCC morphology. Indeed, the former are locations of defects and the latter decreases the thickness and adherence of the film.

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Section: Resultssupporting

confidence: 88%

Chromate Conversion Coating on Aluminum Alloys

Campestrini¹,

Terryn

Vereecken

et al. 2004

J. Electrochem. Soc.

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“…The second option (local IM dealloying) seems more plausible at this stage. Previous studies, for instance, reported that IM particles can sometimes manifest with complex microstructures entailing multiple phase domains [36,[58][59][60][61]. Such local compositional differences could lead to (nano) galvanic couplings between a less and a more noble domain within the same IM, thus determining the preferential dissolution of one domain (more anodic) at the expenses of the other (more cathodic).…”

Section: Local Degradation As Function Of Im Compositionmentioning

confidence: 99%

When all intermetallics dealloy in AA2024-T3: Quantifying early stage intermetallic corrosion kinetics under immersion

2021

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“…This can occur either at isolated particles or in clusters of multiple particles [29]. Two types of intermetallic particles can be distinguished, namely those containing Al-Cu(-Mg) or Al-Cu-Fe-Mn(-Si) [31][32][33]. The most numerous are Al 2 CuMg (S-phase) particles, belonging to the first type [28,34].…”

Section: Introductionmentioning

confidence: 99%