Field Test on Corrosion Behavior of Concrete and Anticorrosion Coatings in Flue Gas Region of Desulphurization System

The corrosion behavior of concrete and anticorrosion coatings in flue gas region of desulphurization system was studied by field testing for 3 months and 6 months. The test specimens included unprotected concrete and concrete block with glass flake coating or high temperature resistance glass fiber reinforced plastic lining. The outward appearance, corrosion morphology of rebar in concrete specimens and Cl- content in concrete specimens were studied. The results show that Cl- can permeate into the unprotected concrete specimens, and thus cause marked corrosion of rebar in concrete specimens. Glass flake coating has some small blister and can provide some extent protection to the rebar in concrete specimen. High temperature resistance glass fiber reinforced plastic lining has very good corrosion resistance and can give an ideal protection to the rebar in concrete specimens.