Chloride induced pitting corrosion of Swedish iron in ordinary Portland cement mortars and alkaline solutions: the effect of temperature.

Pitting potentials were measured in CPC mortars and alkaline solutions containing different levels of chloride, using a potentiodynamic method. Results at 0 degreesC, 20 degreesC and 40 degreesC show that with increasing temperature pitting potentials tend to fall and the critical concentration of chloride needed for pitting decreases. It is suggested that in the case of mortars the release of bound chloride into the pore solution as temperature is increased is a contributory factor. The influence of temperature on pit initiation is discussed. (A)