Petroleum Engineering
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Item Electron-optical and auger electron spectroscopy studies of a zirconium conversion coating on Aluminium(Institute of Metals and Technology, Ljubljana, 2019) Adediran, A.A.; Oki, M.; Akintola, S.A.; Ogunsemi, B.; Akinlabi, E.T.The techniques of scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultramicrotomy and energy dispersive X-ray analysis (EDX) were employed to examine conversion coatings on aluminium developed from a zirconium nitrate/fluoride solution. The coating developed slowly on a microscopic metal substrate with islands of zirconium-rich centres within the coating matrix. According to the TEM assessment, the coating thickness was 30 nm for specimens treated for 60 s and 50 nm for those treated for 900s. The population of the zirconium-rich centers ranged from 2.8 × 1012 m–2 to 6 × 1012 m–2 over the treatment period. According to Auger-electron-spectroscopy in-depth analyses, the coating is composed of three diffused layers with an outer region of zirconium oxide followed by a layer of aluminium oxide/hydroxide and an inner layer at the metal/coating interface comprising compounds of aluminium and fluorides. The corrosion-resistance and paint-adhesion characteristics of the zirconium conversion coating are superior to those of bare aluminium.Item Electron-optical and auger electron spectroscopy studies of a zirconium conversion coating on aluminium(2019) Adediran, A. A.; Oki, M.; Akintola, S. A.Item Electron-optical and auger electron spectroscopy studies of a zirconium conversion coating on aluminium(2019) Adediran, A. A.; Oki, M.; Akintola, S. A.