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Portugaliae Electrochimica Acta
versão impressa ISSN 0872-1904
Resumo
JAYASHREE, A. et al. Malonic Acid as Transporter of Zn2+ Towards: Carbon Steel Surface. Port. Electrochim. Acta [online]. 2009, vol.27, n.1, pp.23-32. ISSN 0872-1904.
The inhibition efficiency (IE) of malonic acid (MA)-Zn2+ system in controlling corrosion of carbon steel immersed in well water has been evaluated by weight-loss method. The formulation consisting of 50 ppm of MA and 50 ppm of Zn2+ has 85% IE. The influence of N-cetyl-N,N,N-trimethylammonium bromide (CTAB) and N-cetyl pyridinium chloride (CPC) on the IE of the MA- Zn2+ system has been studied. At lower pH value (pH=6) IE decreases and in alkaline medium (pH=8) IE increases. Polarization study reveals that MA-Zn2+ system functions as a mixed inhibitor. AC impedance spectra reveal that a protective film is formed on the metal surface. FTIR spectra reveal that the protective film consists of Fe2+-MA complex and Zn(OH)2.
Palavras-chave : carbon steel; corrosion inhibition; malonic acid; well water.