10 Pages

The impact of decreasing chloride concentration on the corrosion state of steel in alkaline solution

WithT. Eichler, A. Faulhaber, K. Weidauer & B. Isecke

Keywords: cathodic protection, corrosion, repassivation, decreasing chloride concentration, steel, alkaline solution, secondary protection system, macro cell


Usually, the reinforcement of reinforced concrete structures is well protected against corrosion by a dense and pore free oxide layer, the so called passive layer that forms on the steel surface in the highly alkaline environment, which is provided by the surrounding concrete. This layer has only a thickness of a few nanometres but it almost completely suppresses the anodic dissolution of iron (1).