Study of charge and mass transference on copper/liquid interface : an application of QCM / Estudo da transferencia de carga e massa na inteface cobre/liquido : uma aplicação da QCM

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

In this work we used the QCM (Quartz Crystal Microbalance) as an alternative technique for the studying of the corrosion/inhibition of cooper. We studied the protection of cooper surfaces due to the adsorption of a volatile corrosion inhibitor, (VCI-Cyclehexilamine-Benzoate). We used electrochemical techniques to characterize the corrosion in different environments. We applied the QCM together with the potentiostat as a method of determination of charge and mass variations. In this work the QCM has been used as a complementary technique for investigating the corrosion of copper with and without adsorbed inhibitors. The protection of copper surfaces due to the adsorption of a volatile corrosion inhibitor (VCI) ? Cyclohexylamine Benzoate ? has been studied by electro chemical techniques to characterise the corrosion in aqueous environments over a wide range of pH values. The presence of VCI films on the copper surface was also shown by Reflection-Absorption Infra-Red Spectroscopy (RAIRS), a technique indicated for situations when very thin films are formed. The EQCM, which used 6 MHz gold-sputtered quartz crystals coated with electrodeposited copper films, was applied to the simultaneous determination of the charge and frequency variations associated with the corrosion process, with and without adsorbed inhibitor. Based on the measurements, a model has been developed to describe the dynamics of adsorption of the VCI on the metalli surface, including the formation of pits on the surface

ASSUNTO(S)

inibidores de corrosão volateis quartz crystal microbalance eletroquimica copper microbalança de cristal de quartzo volatile corrosion inhibitors surfaces (physics) superficies (fisica) cobre - corrosão electrochemistry

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