Change Depend on Time of Cathodic Current in Tidal Zone of Cathodically Protected Marine Steel Structure

Abstract

The results of exposure test by using the test piece which simulates cathodically protected marine steel structure are reported. The cathodic current in the tidal zone was measured. The average current density of cathodic current during a cycle of tidal range was calculated, and the relationship between long term change of the average current density and atmospheric temperature was investigated. The corrosion rate of carbon steel and the weight loss of aluminium anode were investigated. The weight loss of aluminum anode calculated from the average current density was almost equal to the experimental value.