Abstract: A cathodic protection monitoring system which provides IR drop free cathodic protection potential measurements which are indicative of the effectiveness of the cathodic protection system. The system measures the polarized potential between a reference electrode and a coupon subsequent to decoupling the coupon from the protected structure. The present invention controls the time or times at which the potential is measured in order to ensure that the potential is measured only after the polarized potential has achieved a relatively steady state value. More particularly, the cathodic protection monitoring system controllably measures the polarized potential after the potential has stabilized to the extent that there are no inductive or capacitive voltage spikes present, and before the coupon potential decays significantly due to depolarization.

Abstract: A method and apparatus for the removal of chlorides from steel reinforced concrete utilizes an electrode with a rectifier impressing a voltage between the steel of the concrete and the electrode. The electrode and the surrounding concrete are saturated continuously with a controlled flow of an aqueous electrolyte. The aqueous electrolyte which may be water or salt water increases chloride movement within the concrete away from the steel reinforcing and improves the efficiency of the process by maintaining a saturated pore structure within the concrete. To facilitate such saturation of the concrete and electrode, the electrode may be immersed in a matrix of a porous water absorbing medium contained within a non-metallic membrane or jacket cover. In some forms, a collecting bin or reservoir is provided at the bottom to collect the aqueous solution for recirculation. For offshore or other installations, no collecting reservoir may be required.