Retarding of corrosion processes on reinforcement bar in concrete with an FBE coating

Fusion-bonded epoxy-coated rebar (FBECR) was studied by casting in a poor quality concrete and subjecting the specimens to a cyclic wet/dry exposure (monthly) using either 3.5% NaCl or demineralised water over a period of 12 months. On-going measurements of half-cell potentials were made together with regular visual observations. At the end of the test, the bars were removed for visual inspection and assessed for corrosion rate using weight loss. Variables examined included the presence or absence of a coating holiday (3 mm ∅) and the presence or absence of a chromate conversion coating. It was concluded that the FBECR provided a significant improvement in corrosion resistance that was further enhanced by the presence of the chromate conversion coating.