EFFECT OF ANIONS ON CORROSION INHIBITION MECHANISM OF TUNGSTATE FOR CARBON STEEL IN AQUEOUS SOLUTIONS
水中阴离子对钨酸盐缓蚀机理的影响

The corrosion inhibition mechanism of tungstate used alone in neutral aqueous solutions was studies by measuring potentiodynamic polarization curves. The effect of several kinds of anions, dissolved oxygen and pH value on open circuit potential and potentiodynamic polarization was investigated and discussed. The results of experiments showed that there was competitive adsorption among WO 4 2- ,Cl - and OH - on the surface of carbon steel. Heightening the concentration of dissolved oxygen conduced to suppressing propagation of corrosion pits.SO 4 2- ]<10 -2 mol/L had hardly effect on it. Carbon steel could not be passivated in high SO 4 2- concentration solutions.