Microstructural characterisation of oxide layer developed by sulphuric anodisation on 2017A alloys

Abstract

In this paper, the characteristics of the oxide film formed on the surface of 2017A aluminium alloy by sulphuric oxidation are investigated. Morphological features on the oxide film are studied using scanning electron microscopy. Crystallographic details are obtained using X-ray diffraction. The composition of the oxide layer is estimated using wavelength dispersive X-ray spectrometry and Raman spectroscopy. Through systematic structure–property studies, the microstructure of the oxide layer is identified providing the incorporation of the alloying elements in the inner layer with a copper enrichment at the interface.

TSA anodising voltage effects on the near-surface coarse intermetallic particles in the AA2024-T3 and AA2198-T8 alloys

“…For example, Zahavi et al [62], Iglesias-Rubianes et al [63], Curione et al [64], Saenz de Miera et al [65,66] and Nickel et al [67] studied the effect of micrometric particles on the anodising behaviour of the AA2024 alloy. Also, Fares et al [68,69], Bononi et al [70], Abdel-Gawad et al [71], Veys-Renaux et al [72] and Elkilany et al [73] carried out works on the effect of micrometric particles on the anodising of other alloys different from the Al-Cu-Mg series. For the Al-Cu-Li alloys, the works of Viejo et al [74], Ma et al [75–78], Bononi et al [79] and Wu et al [80] explain the behaviour of the AA2099 alloy during anodising.…”

Coupled effects of substrate microstructure and sulphuric acid anodizing on fatigue life of a 2017A aluminum alloy

“…The incorporation of the alloying elements into the oxide layer, such as Cu and Mg were established by EPMA [25,26] in agreement with the findings reported earlier concerning a series of metastable sputtering-deposited Al-Cu films [9,10]. Copper has a strong influence on the corrosion of aluminum alloys, where it is present in at matrix regions or as a constituent of secondary phases.…”

“…In previous works conducted on the 2017A aluminum alloy [25][26][27], the morphological changes that occur in the anodic film as a consequence of the changes in substrate microstructure after heat treatments of artificial aging and annealing, have been investigated. One of the results of this study is the major role of intermetallic compounds (size and dispersion) on the oxide morphology and composition.…”