The inhibition effect of 2-pyrazinecarboxamide (PCA), KI and their synergistic effect on the
corrosion of carbon steel in 0.5 MH 2 SO 4 solution was studied by electrochemical
techniques. Scanning electron microscopy (SEM) was used to characterize the steel surface.
The inhibition efficiency increases with the concentration of PCA and KI and increase further
in the presence of PCA/KI mixture. The open circuit potential and polarization measurements
suggested that PCA and its mixture with KI act as mixed-type inhibitor; while, KI only acts as …

The inhibition effect of 2-pyrazinecarboxamide (PCA), KI and they synergistic effect on the
corrosion of carbon steel in 0.5 MH2so4 solution was studied by electrochemical
techniques. Scanning electron microscopy (SEM) was used to characterize the steel surface.
The inhibition efficiency increases with the concentration of PCA and KI and increase further
in presence of PCA/KI mixture. The open circuit potential and polarization measurements
suggested that PCA and its mixture with KI act as mixed-type inhibitor; while, KI only acts as …