PAULO ROBERTO COSTINHAS DA SILVA
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Artigo IPEN-doc 29910 Obtention of hard coating using electrochemical process in aluminum-silicon alloys for automotive vehicles2023 - SILVA, P.R.C.; COLOSIO, M.A.; ORLANDO, M.T.D.; ROSSI, J.L.Automotive industry is searching for new ways to improve vehicles’ energy efficiency through mass reduction, using aluminum alloys. This change requires a surface protection to extend the life cycle of the components and aluminum anodization is the most used solution. This research is focused on the intake and exhaust ducts’ surfaces of aluminum internal combustion engines cylinder head, which are subject to chemical agents and temperature variation. To extend the working life of this component it is necessary to obtain a covering protective layer. The process targeted the anodization of an internal surface of a much larger part of a cast aluminum-silicon alloy cylinder head. The anodization was obtained using a H2SO4 solution (184 g.L-1) and a DC voltage starting at 20 V. The Al2O3 layer obtained, inside the cylinder head´s ducts, has an average thickness of 120 μm in accordance with the proposal of providing a suitable surface protection.Resumo IPEN-doc 29411 Al-Si automotive components hard coating implementation by electrochemical process2022 - SILVA, P.R.; ROSSI, J.L.; COLOSIO, M.; ORLANDO, M.T.The anodization processes related to the formation of protective (Al2O3) layers were first used on 1854. Ever since, new aluminum alloys were developed and this electrochemical process is widely used for most surface protection applications. The intake and exhaust ducts’ surfaces of internal combustion engines are prone to chemical agents and significant temperature variation. In order to extend the working life of these components it is necessary to implement covering protective layers all over the internal duct's surface. The present research work encompasses both, the required development phases for both, the mechanical and corrosion resistances improvement. The process was undertaken to allow the anodization of a small internal surface of a much larger part, which is the internal exhaustion duct of a cast aluminum-silicon cylinder head. The anodizing was obtained using H2SO4 solution 10% in volume and a DC current starting with 20 V. The Al2O3 layer attained, inside the cylinder head´s ducts, had an average thickness of 120 μm in accordance with the proposal of providing a suitable surface protection during the component´s lifecycle.