Assessment of polyester and polyvinylester coatings in a simulated FGD scrubbing liquid with EIS

Jing Chie Lin, Liang Yie Lue, San Der Chyou, Huei Neng Horng

Research output: Contribution to journalArticlepeer-review

Abstract

Corrosion behaviours of carbon steel coated with polyester and polyvinylester in a simulated flue gas desulphurisation (FGD) fluid (i.e., a mixture of H2SO4 and 0.1 wt% Fe2(SO4)3 at pH=2) have been investigated with electrochemical impedance spectroscopy (EIS). The protective nature of the coatings at 25°C has been observed in the following order: polyvinylester primer >> polyvinylester topcoat > polyester topcoat > polyester primer. Coating deterioration occurred and the coating deterioration rate accelerated with increasing temperatures upto 85°C. However, the corrosion resistance sequence has remained the same. Equivalent circuits are suggested for various coatings to discuss their mechanisms in this work.

Keywords

  • EIS
  • FGD
  • Organic coating
  • Polyester
  • Polyvinylester

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