Galvanic polarization tests clearly showed the increase of pitting resistance when US vibration is applied to the stainless steel. However, the efficiency of this approach was tested with weight-loss technique. The steel specimen was polarized in series NaCl solutions (No 6-9, table 1). The weight loss data is reported in fig. 5. From the results obtained it is clearly seen, that the application of US vibration prevents dissolution of steel. The specimens, treated in 100 g/l NaCl solution were investigated with SEM. The microphotographs are given in fig. 6. The surface of non-vibrating plate is heavily damaged with pittings, however, no signs of dissolution is visible on vibrated specimen.