The inhibition effect of brass corrosion in NaCl 3% by eugenol [L'effet inhibiteur d'Eugénol sur la corrosion du laiton dans NaCl 3%]

In recent decades,natural substances were intensively studied in order to determine their active compounds that have found its application in food and medical-sciences. the growing interest in such substances diversifies its applications including as anti-corrosion substances. indeed,interesting results were obtained with essential oils as materials protection for metals,beside these natural inhibiters were recognized as not toxic elements and therefore do not present risks for environmental pollution compared to the organic inhibiters. in this work,we studied the effect of essential oil of clove (recognized in medical field by its analgesic and antiseptic properties) on the corrosion of brass (70%cu/30%zn) in nacl 3%. the results obtained showed a improvement of alloy resistance against salt corrosion. in order to determine the most active component of this essential oil,that plays a key role in inhibiting corrosion of this alloy,the eugenol was extracted from the essential oil of clove. the effect of concentration,temperature and the immersion time were studied to measure the inhibiting capacity of eugenol by using polarization and electrochemical impedance spectroscopy (eis).