Inhibition activity of Seaweed extract for mild carbon steel corrosion in saline formation water

•Seaweed extract inhibited mild C-steel corrosion in saline formation water.•Corrosion inhibition by Seaweed extract is due to the constituents in the extract.•The adsorption phenomenon obeys the Temkin adsorption isotherm.•The inhibition efficiency increased with the Seaweed extract concentration.•The maximum efficiency obtained was 93%, whereas at 328 K it declined to 85%.

The inhibition effect of Seaweed extract on the corrosion of mild carbon steel in saline formation water was studied by weight loss, polarization and electrochemical impedance spectroscopy (EIS) methods. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) examinations of the electrode surface have also been carried out. The effect of Seaweed extract on the corrosion rate was determined at various temperatures and concentrations. The inhibition efficiency increases with the increase in Seaweed extract concentration but decreases with the rise in temperature. The adsorption of constituents of Seaweed extract obeyed the Temkin adsorption isotherm. Polarization results revealed that Seaweed extract suppresses the anodic reaction. The kinetic parameters of the corrosion process were evaluated and discussed.