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A galvanostatic pulse technique was used to study corrosion of steel in mortar immersed in simulated sea water and steel exposed to 0.3 M NaOH + 0.6 M NaCl, both as aqueous solution and set with agar gel. Transients were analysed to provide impedance information. Diffusion impedance was identified for corroding steel embedded in mortar and in gel but not in solution. Three time constants were evident for steel embedded in mortar while only two time constants were identified for corroding steel in alkaline chloride gel and solution. The extra time constant for steel cast in mortar appears to be associated with the dielectric characteristics of the mortar.

A galvanostatic pulse technique was used to study corrosion of steel in mortar immersed in simulated sea water and steel exposed to 0.3 M NaOH + 0.6 M NaCl, both as aqueous solution and set with agar gel. Transients were analysed to provide impedance information. Diffusion impedance was identified for corroding steel embedded in mortar and in gel but not in solution. Three time constants were evident for steel embedded in mortar while only two time constants were identified for corroding steel in alkaline chloride gel and solution. The extra time constant for steel cast in mortar appears to be associated with the dielectric characteristics of the mortar.