1 GSJ: Volume 9, Issue 8, August 2021, Online: ISSN 2320-9186 www.globalscientificjournal.com EXTRACTS OF PREMATURE DACRYODES EDULIS SEED AND THEIR CORROSION INHIBITION POTENTIALS ON MILD STEEL IN 1 M HCl PRESENCE Anthony C. Ehiemere 1 , Peace Emele 2 , Amanze Kenneth Obichere 3 1. Department of Chemistry, Abia State Polytechnic, Aba, Nigeria 2. Joint Admissions and Matriculation Board, Owerri, Nigeria\ 3. Chemistry Department, Alvan Ikoku Federal College of Education, Owerri CORRESPONDING AUTHOR: Anthony C. Ehiemere Department of Chemistry, Abia State Polytechnic, Aba, Nigeria Email: chimex4tops@yahoo.com ABSTRACT Gravimetric and electrochemical techniques (weight loss, effects of difference in temperatures, and electrochemical verifications) were carried out on premature Dacryodes edulis seed extract in IM HCI as corrodent at different temperatures and time (24 hours immersion time at room temperatures, 1 hour immersion time at 40 0 C and 1 hour immersion time at 70 0 C). The results showed that inhibition efficiency increased with increase in concentration of inhibitor and corrosion rate decreased with increase in concentration of inhibitor. The result from the potentiodynamic polarization and electrochemical impedance also suggest that the premature Dacryodes edulis seed extract is a cathodic inhibitor and the mechanism of physisorption and chemisorption were observed from results obtained from the calculation of heat of adsorption, as well as from analysis of the results provided from the electrochemical experiments. Hence premature Dacryodes edulis seed extract has corrosion inhibitive properties, and functions as a mixed inhibitor. INTRODUCTION According to Corrosionpedia (2018), acidic corrosion is a gradual destruction and wearing away of a material (e.g., metal) due to acidic compounds present in the environment. The acids may be those coming from the soil, industrial atmosphere, water or toxic chemicals that react with the material they come in contact with. Amitha and Bharathi (2011) defined corrosion as the deterioration of a metal by chemical attack or reaction with its environment. When metals are exposed to aggressive environments such as, the use of acid solutions for pickling, chemical and electrochemical etching of metal, industrial acid cleaning, cleaning of oil refinery equipment, oil well acidizing and acid descaling, they usually lead to loss of the metal due to corrosion (Ating et al., 2010, Bishir et al., 2017). It has been estimated that approximately 5% of any industrialized nation’s income is spent on corrosion prevention, maintenance and replacement of products lost or contaminated due to corrosion reactions (Abiola, 2002). Industrial operations such as oil well acidification, acid pickling, acid cleaning and acid descaling are operating in acidic environment (Swathi et al., 2017). GSJ: Volume 9, Issue 8, August 2021 ISSN 2320-9186 1923 GSJ© 2021 www.globalscientificjournal.com