STUDIES ON CORROSION BEHAVIOR OF CERAMIC SPRAYED STAINLESS STEELS (REPORT II) - UTILIZATION OF ANODIC POLARIZATION CURVES TO EVALUATE CORROSION TENDENCY.

The anodic polarization curves of ceramic plasma-sprayed samples, blasted stainless steel and coating films in 3. 5%NaCl solution were separately determined. The result obtained by the polarization curve method was similar to that obtained by the natural potential method. The high Al//2O//3-content coatings of Al//2O//3-TiO//2 system ceramics were much more beneficial than the high TiO//2-content coatings. Corrosion sensitivity taking the effect of both the mean passive current density and the passive potential range into account, was derived and regarded as a criterion for judging the corrosion behavior of sprayed samples.