SciELO - Scientific Electronic Library Online

 
vol.54 número3PREPARATION AND CHARACTERISTICS OF NOVEL HYPERBRANCHED PEU-BASED GEL POLYMER ELECTROLYTESDIRECT ORTHOGONAL SIGNAL CORRECTION-PARTIAL LEAST SQUARES FOR SIMULTANEOUS SPECTROPHOTOMETRIC DETERMINATION OF SULFAMETHOXAZOLE AND TRIMETHOPRIM IN PHARMACEUTICAL FORMULATION AND SYNTHETIC SAMPLES índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Journal of the Chilean Chemical Society

versão On-line ISSN 0717-9707

Resumo

FOUDA, A. S  e  MAHFOUZ, H. INHIBITION OF CORROSION OF α-BRASS (Cu-Zn, 67/33) IN HNO3 SOLUTIONS BY SOME ARYLAZO INDOLE DERIVATIVES. J. Chil. Chem. Soc. [online]. 2009, vol.54, n.3, pp.302-308. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072009000300021.

The influence of some arylazo indole derivatives on the corrosion rate of 70/30 á-brass in 2 mol 1-1 HNO3 was investigated using weight loss and galvanostatic polarization techniques. It was found that the investigated compounds behave as inhibitors. The inhibition efficiency increases with increasing the inhibitor concentration, but decreases with increasing the temperature. The adsorption of these compounds on the á-brass surface follows a Frumkin's adsorption isotherm. The electrochemical results indicated that all the investigated compounds act as mixed-type inhibitors. The influence of the substituent group on the inhibition efficiency of the inhibitor was explained in terms of the density of the electron cloud on arylazo indole moiety. Some thermodynamic parameters for corrosion and adsorption processes were determined and discussed.

Palavras-chave : corrosion inhibition; á-brass; synergistic effect; HNO3; arylazo indole derivatives.

        · texto em Inglês     · Inglês ( pdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons