Kritischer Chloridgehalt – Untersuchungen an Stahl in chloridhaltigen alkalischen Lösungen

Critical chloride content – Investigations of steel in alkaline chloride solutions The question of the critical corrosion-inducing chloride content of steel in concrete still incites controversial debates. In a first series of trials, which will be outlined as part of the present article, the reduced corrosion system of steel/concrete pore solution was investigated. The results suggest that a log-log linear relationship exists between the molar concentrations of corrosion-inducing and passivating ions that can be expressed by the following equation: log c(Cl¯)_krit = 1.5 · log c(OH¯) - 0.245. On the basis of this relationship the results compiled in the bibliographical search were discussed and the significance with respect to the pitting potential was explained. Supplementary investigations into the time of chloride addition and the composition of the pore solution were conducted.