Abstract
The inhibition effect of sunflower head-extract (SFHE) for carbon steel in 1 M hydrochloric acid (HCl) and 0.5 M sulfuric acid (H2SO4) solution was studied by weight loss measurement, electrochemical measurements, and ultra-depth three-dimensional microscope. The adsorption/desorption of SFHE from carbon steel surface was studied by the differential polarization curves. The thermodynamic and kinetic parameters were also calculated and discussed. The results show that SFHE is an excellent inhibitor in 1 M HCl and 0.5 M H2SO4, the SFHE exhibits the highest inhibition efficiency of 96.4% and 91.9% at 3 g/L at 298 K in 1 M HCl and 0.5 M H2SO4, respectively. In addition, the inhibition efficiency follows the order: HCl ˃ H2SO4. The adsorption of SFHE on the carbon steel surface obeys the Langmuir adsorption isotherm. All the results reveal that SFHE can be used as a sustainable and environmentally friendly corrosion inhibitor for carbon steel in acid solution in the future.
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