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

Jing‐Chie Lin Department of Mechanical Engineering, National Central University, Chungli, Taiwan 320, R.O.C.

Liang‐Yie Lue Department of Mechanical Engineering, National Central University, Chungli, Taiwan 320, R.O.C.

San‐Der Chyou Power Research Institute, Taiwan Power Company, Taipei, Taiwan 238, R.O.C.

Huei‐Neng Horng Power Research Institute, Taiwan Power Company, Taipei, Taiwan 238, R.O.C.

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.

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

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

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