Corrosion Surveys of Steel Structures under Marine Environment

Abstract

For studying the corrosion of steel structures under marine environment and for examining the effectiveness of corrosion protection, 229 port facilities with steel members were surveyed. In some of them, concentrated corrosions were found just below the mean low water level and the rate of corrosion where the severest concentrated corrosion had taken place was estimated to be larger than 0.93 mm/yr. Except such places, the corrosion rates of steel in sea water and bottom soil were about 0.1 mm/yr. In the structures to which the corrosion protection with the electrode of aluminum alloy was applied, the protection potentials were maintained below the corrosion potential and no concentrated corrosion was found.