CORROSION AND POTENTIOSTATIC HYDROGENATION OF CARBON-STEELS IN CARBONATE-SULFATE SOLUTIONS

Corrosion behavior and hydrogenation of two structural carbon steels w ere studied at controlled potentials from -1.4 V to +0.4 V (vs. normal hydrogen electrode) in a carbonate-bicarbonate solution (pH 9.4) unde r (a) free access of oxygen; (b) deaeration of solution with argon; an d (c) saturation with hydrogen sulfide (pH 8.5). The susceptibility of steels to cathodic and anodic hydrogenation in the solutions was dete rmined. It was established that a shift in the electrode potential res ulted in the cathodic protection of steel in a solution, but stimulate d corrosion in a carbonate-sulfide solution thus manifesting a ''negat ive protect-effect.'' It was established that IFKhANGAZ inhibitor supp ressed anodic hydrogenation of steels much more efficiently in carbona te-sulfide solutions than in hydrogen-sulfide saturated chloride solut ions.