Protective effect of Toddalia asatica leaf extract on Mild steel in 1.0N HCl

Sangeetha Thangaraja, Mathusudhan M, Deepa Rani P, Selvaraj S

Abstract


A study has been made on the Novel corrosion inhibitor on mild steel in 1.0N HCl. Commonly deterioration of steel is caused due to various environmental and other chemical factors. It is unavoidable but protectable using inhibition methods. Here the usual inhibitor is replaced by green inhibitors to evade toxicity, easy availability, and to minimize the waste. This work seeks out to analyze the dried leaves of Todalia Asiatica as an inhibitor on mild steel in 1.0N HCl.  The anticorrosive effectiveness of this inhibitor is studied by using non- electrochemical and electrochemical techniques. Non -electrochemical studies such as the effect of time (87.6%) and temperature (93.0%) at optimum concentration show the maximum inhibition efficiency of the inhibitor due to the formation of an inhibited layer by the inhibitor on the metal surface. Langmuir isotherm most closely fits into the info data obtained suggesting the physical adsorption between the extract and the mild steel substrate. Electrochemical such as potentiodynamic polarization studies proved that extract of Todalia Asiatica dried leaves is a cathodic type of inhibitor and 85.12% inhibition efficiency provided by the inhibitor. Charge Transfer Resistance (Rct) value increased and also Double-layer capacitance (Cdl) value decreases by EIS studies. The observed inhibitor efficiency at optimum inhibitor concentration is 84.05%. Surface and corrosion product Analysis (EDX/FTIR)  was carried out to determine the corrosion-inhibitive properties of the samples.


Keywords


Corrosion; Mild steel; Inhibition; Toddalia asatica

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