Chloride-Induced Corrosion of Epoxy-Coated Steel in Saturated Ca(OH)2 Solution and in Concrete

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Title: Chloride-Induced Corrosion of Epoxy-Coated Steel in Saturated Ca(OH)2 Solution and in Concrete

Author(s): J. Havdahl, B.B. Hope and C. M. HanssonJ. Havdahl, B.B. Hope and C. M. Hansson

Publication: Special Publication

Volume: 170

Issue:

Appears on pages(s): 397-420

Keywords: Chlorides; coatings; corrosion; durability; epoxy resins; reinforced concrete; tests.

Date: 7/1/1997

Abstract:
The use of epoxy coated steel reinforcement in concrete serves to contribute to service life extension in aggressive environments especially where proper procedures for handling and placing of the steel are followed. In this study, it is shown the durability of these steel bars exposed in saturated calcium hydroxide (Ca(OH)2) solution and/or concrete is affected by the presence of chlorides. Test parameters included measurement of electrochemical potential and electrical resistance changes with exposure time, and corrosion monitoring using DC linear polarization (LPR) and electrochemical impedance spectroscopy (EIS). Corrosion damage was particularly critical at all as received flaws and holidays, and also deterioration was detected around the bends and patched coating areas.