This paper discusses the capability of Electrochemical Noise Measurements
(ENM) in terms of applications on steel in concrete with respect to pitting corrosion. Passive
and active steel specimens in solution as well as in concrete are investigated and the results
particularly with regard to the conductivity of the electrolyte and the influence of porosity
respectively are evaluated. Two different types of concrete, with fly ash and without, were used
to obtain noticeable differences in conductivity. The results clearly show the general influence
of resistance on the corrosion behavior of steel in concrete and give some indication that ENM
is a capable method also for systems with comparatively high electrolyte resistances.