Al-Si automotive components hard coating implementation by electrochemical process
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2022
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CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 24.
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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.
Como referenciar
SILVA, P.R.; ROSSI, J.L.; COLOSIO, M.; ORLANDO, M.T. Al-Si automotive components hard coating implementation by electrochemical process. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 24., 6-10 de novembro, 2022, Águas de Lindóia, SP. Resumo... Disponível em: http://repositorio.ipen.br/handle/123456789/33777. Acesso em: 22 Feb 2025.
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