CORROSION INHIBITION AND ELECTRO-BALLISTIC PROPERTIES OFGREEN INHIBITOR FOR MILD STEEL IN MINERAL ACIDMahima Srivastava
Implementation of Amaranthus extract as corrosion inhibitor for mild steel in pickling containing hydrochloricacid has been investigated. The electrochemical experiments were conducted to bring forth results regardingvarious parameters, viz., Corrosion Current, Anodic Polarization and Cathodic Polarization. Alongside,experiments for assessing the inhibitor efficiency and concentration of acid were also conducted. Therewas observed a gradual decrease in corrosion current with time for both uninhibited and inhibited systems.The experiments for plotting polarization curves for mild steel at various concentrations of Amaranthusextract in aerated solutions were conducted. These experiments, which are conducted Galvano-statically,depicted the polarization effect of inhibitor on different electrodes. The values, thus obtained, indicatedthat adsorption of Amaranthus extract tends to modify the mechanism of anodic dissolution as well ascathodic hydrogen evolution. The results clearly show that both the cathodic and anodic reactions areinhibited and there was found an increase in inhibition as the inhibitor concentration increases in acidmedia, but the cathode was more polarized than anode. This indicated that Amaranthus extract may beclassified as cathodic inhibitor in 4N hydrochloric acid solution. The aim of conducting these experimentsis to use inhibited acid for pickling so that large structures as well as small tools can be pickled/ cleaned. Asa contribution to the current interest on environment friendly, green, corrosion inhibitors, the present studyinvestigates the inhibiting effect of Amaranthus extract, a green inhibitor which is commonly known asPigweed.