To tests pitting resistance in terms larger scale the weight loss technique was applied. Both vibrating and non-vibrating steel specimens were anodically polarized at 0.2 A/cm2 current density for 10 min in NaCl solutions No 6-9 table 1. The weight loss was determined with 0.0001 g accuracy. The data for 3 specimens were averaged. The surface of the specimens after dissolution in 100 g/l NaCl was investigated with SEM.