Patent ID: 6387244
Filing Date: 2002-05-14
Classification: C23F,E04C

Abstract:
A method of treating a steel-reinforced concrete structure to impregnate it with inhibitor cations comprising,measuring the corrosion potential of the steel, placing a primary anode adjacent an outer surface of the reinforced concrete structure, supplying the primary anode with an aqueous solution of an inhibitor for reinforced concrete and substantially saturating the structure with the inhibitor solution, applying a direct impressed cathodic current, at a chosen first voltage non-injurious to humans, between the primary anode and the steel in the structure at a potential in the range from 50 mV to about 350 mV numerically greater than the corrosion potential measured, maintaining the impressed current until flow is relatively constant at a level at least one-half the level at which the impressed current was initiated.