César A. C. Sequeira *
* Grupo de Electroquímica de Materiais, Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa. E-mail: cesarsequeira@ist.utl.pt
ABSTRACT
The passive films present on some, but not all, metals and alloys have special characteristics that enable them to provide superior corrosion resistant metal surfaces. These protective “passive” films are responsible for the phenomenon of passivity, which has significantly contributed to modern technology (for example, development of stainless steels, semiconductor device technology). In this paper, the theory and basic experimental techniques used to investigate the passivation phenomenon are considered.
Keywords: Passivation Theory, Electrochemical Methods, AES, ESCA
]]> Algumas considerações sobre a teoria da passivação
RESUMO
Os filmes “passivos” com propriedades protectoras à superfície de muitos metais e ligas metálicas são responsáveis pelo fenómeno da passividade. Esta contribui significativamente para a tecnologia actual (por exemplo, aços inox, dispositivos semicondutores). Neste artigo revêm-se os modelos de passivação e descrevem-se as técnicas experimentais mais utilizadas para o seu estudo.
Palavras-chave: Teoria da Passivação, Métodos Electroquímicos, AES, ESCA
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]]> Artigo submetido em Março de 2010 e aceite em Maio de 2010. ]]>