Degradation of protective coatings in steel chimneys of flue gas desulfurisation systems

•Coatings with spherical infill show bad protective properties.•Corrosion rate of structural steel indicate the occurrence of disastrous corrosion.•Failure of chimneys is connected to aggressive environments and mechanical stress. This paper presents problems associated with corrosion of steel stack...

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Bibliographic Details
Published in:Progress in organic coatings 2018-04, Vol.117, p.141-145
Main Authors: Krakowiak, S., Darowicki, K.
Format: Article
Language:English
Subjects:
Chimneys
Clean energy
Construction methods
Corrosion
Corrosion effects
Corrosion prevention
Corrosion resistance
Electrochemical impedance spectroscopy
FGD chimneys
Flue gas
Limestone
Protective coatings
Resistance factors
Steel
Steel structures
Vinyl ester resins
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Summary:•Coatings with spherical infill show bad protective properties.•Corrosion rate of structural steel indicate the occurrence of disastrous corrosion.•Failure of chimneys is connected to aggressive environments and mechanical stress. This paper presents problems associated with corrosion of steel stacks and changes in philosophy of corrosion protection when implemented into flue gas desulphurization systems. In-situ tests were taken by means of electrochemical impedance spectroscopy at the stack which discharges flue gas before wet lime/limestone desulphurization. A very quick electrolyte absorption by the spherical infill vinylester coating was found using the electrochemical impedance spectroscopy. An analysis of destruction shows a joint effect of mechanical and corrosion factors on the poor resistance of the coating. The poor resistance of the coating is also connected with the method of chimney construction and coating application.
ISSN:0300-9440
1873-331X
DOI:10.1016/j.porgcoat.2018.01.011