The effect of disodium cocoamphodiacetate on corrosion-erosion resistance of steel in saline water

The inhibitory actions of disodium cocoamphodiacetate (zwitterionic surfactant, abbreviated as ZS) on the erosion-corrosion of API ×52 steel in sand-containing saline produced water (SSPW) were explored by using electrochemical techniques. The scanning electron microscopy (SEM) and atomic force microscopy (AFM) were used to analyze the steel surface. The results showed that the ZS reduced the effects of the erosion-corrosion of API ×52 steel in SSPW solution. The extent of ZS performance depends on ZS concentration, solution temperature, static and dynamic conditions. The nature of ZS surfactant (i.e. mixed type of inhibitor) was extracted from polarization curves. ZS is more effective in static condition than in dynamic condition. The maximum inhibition efficiency of ZS is 93.2% and 66.7% at static and dynamic conditions, respectively.