2019
DOI: 10.3390/met9030320
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Influence of Aerospace Standard Surface Pretreatment on the Intermetallic Phases and CeCC of 2024-T3 Al-Cu Alloy

Abstract: A standard three-step surface pretreatment employed in the aerospace sector for Al alloys have been investigated prior to the generation of cerium conversion coatings (CeCC) on aluminium-copper alloy 2024. Two pretreatments were analysed, one without final acid etching (Pretreatment 1) and another with this step (Pretreatment 2). Both pretreatments affect the alloy intermetallic phases, playing a key role in the development of the CeCC, and also in the susceptibility to localised corrosion in NaCl medium. Scan… Show more

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Cited by 13 publications
(14 citation statements)
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“…This phenomenon already observed for the 2024-T3 alloy after 15 min treatment in 2.8 M HNO 3 bath [27] is known as dealloying. This was also evidenced for Al(Cu,Mg) phase in the case of AA-2024-T3 after oxidising acid pickling in Turgo Smut Go NC by Alba-Galvin et al [17]. This type of morphology results from the preferential dissolution of aluminium, and magnesium in the case of S-phase.…”
Section: Surface Morphologymentioning
confidence: 59%
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“…This phenomenon already observed for the 2024-T3 alloy after 15 min treatment in 2.8 M HNO 3 bath [27] is known as dealloying. This was also evidenced for Al(Cu,Mg) phase in the case of AA-2024-T3 after oxidising acid pickling in Turgo Smut Go NC by Alba-Galvin et al [17]. This type of morphology results from the preferential dissolution of aluminium, and magnesium in the case of S-phase.…”
Section: Surface Morphologymentioning
confidence: 59%
“…Surface preparation is known to influence the properties of the coatings [4,[12][13][14][15][16][17]. The pretreatment should allow to remove lubricant to clean the surface, standardize and control the chemical composition of the alloy surface to improve conversion coating performances.…”
Section: Introductionmentioning
confidence: 99%
“…EDX analysis included in Table 2 was performed in the areas marked in each image (Supplementary Materials contain original EDX spectra in Figure S1). Sample 2-Ce-1 showed the typical microstructure of the 2024 alloy described in previous works [3,29], where the most common coarse IMPs were Al(Cu,Mg) and Al-Cu-Mn-Fe-(Si). SEM-EDX did not capture the presence of the peaks corresponding to Ce.…”
Section: Scanning Electron Microscopy (Sem-edx)mentioning
confidence: 65%
“…Therefore, the deposition, if any, is not detectable with this technique. Samples 2-Ce-5, 2-Ce-10, and 2-Ce-15 presented three types of morphologies associated with cerium layers: (a) deposits or copper islands typically formed on the intermetallic phases [24,29,32], (b) characteristic areas with cracked coating, and (c) uniform areas without cracking. However, there were still some areas in sample 2-Ce-5 where IMPs were appreciated.…”
Section: Scanning Electron Microscopy (Sem-edx)mentioning
confidence: 99%
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