@article { author = {Azadi, Mahboobeh and Bidi, Mohammad Amin and Rassouli, Maryam}, title = {Comparing the inhibition efficiency of two bio-inhibitors to control the corrosion rate of carbon steel in acidic solutions}, journal = {Analytical and Bioanalytical Electrochemistry}, volume = {13}, number = {1}, pages = {52-66}, year = {2021}, publisher = {Analytical and Bioanalytical Electrochemistry is an international scientific journal, which is published online every 3 months (since 2009), every 2 months (since 2011) and monthly (since 2018) by Center of Excellence in Electrochemistry, University of Tehran}, issn = {-}, eissn = {2008-4226}, doi = {}, abstract = {In this study, the inhibition efficiency of two bio-inhibitors to decrease the corrosion rate of carbon steel in acidic solutions is investigated. These green inhibitors contained the protein prepared from the Hyalomma tick and leech extract. Both potentiodynamic polarization and electrochemical impedance spectroscopy measurements were utilized for this research. When the inhibitor concentration increased, the inhibition efficiency increased for both inhibitors; however, adsorption isotherm mechanisms for these inhibitors were different. In addition, the inhibition efficiency for the leech extract was higher than the Hyalomma tick extract in corrosive solutions. This inhibition efficiency range in the H2SO4 solution was about 93-97% based on polarization test results. Changes in corrosion potential showed that molecules adsorption of both bio-inhibitors on steel substrates acted as mixed inhibitors. Calculated ΔGads values for corrosion reactions in the presence of both bio-inhibitors demonstrated that a physical adsorption event has happened on steel substrates. Based on the EIS test results, when the concentration of Hyalomma tick extract increased to 0.06 g/L, the suggested electrical circuits changed due to the formation of a layer of inhibitor molecules on the steel substrate in the HCl solution.}, keywords = {Bio-inhibitor,Hyalomma tick extract,Leech extract,Corrosion resistance,Acidic solutions}, url = {https://www.abechem.com/article_245918.html}, eprint = {https://www.abechem.com/article_245918_9badabc450326f0079dc88ce66a67496.pdf} }