Abstract

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.

Keywords : carbon steel; corrosion inhibition; malonic acid; well water.

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