A study on the inhibition of N80 steel in 3.5% NaCl solution saturated with CO2 by fruit extract of Gingko biloba

• Environment benign fruit extract of Gingko biloba as corrosion inhibitor for N80 steel.
• Electrochemical measurements using potentiodynamic polarization and EIS.
• SECM, SEM and UV–vis were used to study the surface morphology.
• The adsorption of GBFE extract obeyed Temkin adsorption isotherm.

The inhibition of the corrosion of N80 steel in 3.5 wt.% NaCl solution saturated with CO2 by the fruit extract of Gingko biloba (GBFE) was investigated using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques. Inhibition efficiency was found to increase with increasing concentration of the extract. The adsorption of the extract on the N80 steel surface obeyed the Temkin adsorption isotherm. Polarization curves showed that GBFE behaves as a mixed-type inhibitor in NaCl solution. The adsorbed film on N80 steel surface containing inhibitor was confirmed by the SEM, SECM, and UV–vis results. The results obtained showed that the GBFE could serve as an effective inhibitor of the corrosion of N80 steel in 3.5% NaCl saturated with CO2.