N-LAUROYL SARCOSINE SODIUM-SALT AS A CORROSION-INHIBITOR FOR TYPE-1518 CARBON-STEEL IN NEUTRAL SALINE ENVIRONMENTS

The influence of the sodium salt of N-lauroyl sarcosine (NLS) on corro sion of a manganese steel was studied in aerated, nearly neutral salin e solutions at room temperature and under various hydrodynamic conditi ons. The inhibitive efficiency of NLS was examined using gravimetric t ests, polarization curves, and electrochemical impedance spectroscopy (EIS). The additive slowed the corrosion phenomena, either generalized or localized, that occurred on steel, but only at the high rotation s peed of the rotating cylinder electrode (RCE). The mechanism of action was anodic and probably resulted from precipitation of an insoluble p roduct on the anodic areas.