Authors : Olugbenga Adeshola Omotosho, Joshua Olusegun Okeniyi, Jacob Olumuyiwa Ikotun and Esther Titilayo Akinlabi
Abstract: In this study, the anticorrosion performance of K2CrO4 (potassium chromate) on mild steel in 0.5 M HCl environment was studied. Samples of mild steel were immersed in the 0.5 HCl medium containing different concentrations of the K2CrO4 and the corrosion of the samples were monitored using Gravimetric method and potentiodynamic polarization technique by Linear Sweep Voltammetry (LSV) instrument. Results by the two corrosion monitoring techniques showed that the inhibition efficiency was increasing as K2CrO4 concentration increased, even as this effectiveness increment was more prominently observed in the electrochemical monitoring technique of potentiodynamic polarization. By this, the inhibition mechanism by the K2CrO4 was characterized as predominantly anodic. Fitting of the experimental data to adsorption isotherm models identified the Langmuir adsorption isotherm as having the best-fit for the metal-inhibitor interaction mechanism. This indicated spontaneous and favourable adsorption as well as physisorption as the prevalent mechanism of K2CrO4 adsorption on the mild steel surface. These results exhibit potency of mild steel corrosion protection in many industrial applications employing hydrochloric acid and in which mild steel is used as construction material.
Olugbenga Adeshola Omotosho, Joshua Olusegun Okeniyi, Jacob Olumuyiwa Ikotun and Esther Titilayo Akinlabi, 2019. Anticorrosion Performance of K2CrO4 on Mild Steel in 0.5 M HCl. Journal of Engineering and Applied Sciences, 14: 8273-8281.