Synthesis of anticorrosive and flame-retardant coating based on turmeric (Curcuma longa) and magnesium hydroxide

Abstract

The green corrosion inhibitor is used in the epoxy coating system by the extraction of turmeric in dimethyl formamide (DMF). The major component extracted is curcumin. Three concentrations have been studied for anticorrosive performance, i.e., X, 2X, and 4X. Among these concentrations, X-based concentration showed the best performance. Magnesium hydroxide Mg(OH)2 has been treated with 3-glycidoxypropyltrimethoxysilane (GPTMS). It was added into the coating formulation at three concentrations, namely 5%, 7%, and 10% (w/w). The best anticorrosive performance has been observed for the 5% concentration. As the concentration increases, the anticorrosive performance decreases, but flame retardancy increases. The 7% Mg(OH)2 concentration has been combined with turmeric X concentration. It is observed that the combination of extract with Mg(OH)2 gives good anticorrosive performance as well as flame retardant properties. The anticorrosive performance is evaluated by salt spray and electrochemical impedance spectroscopy (EIS), and flame retardancy is evaluated by the Limiting Oxygen Index (LOI) and UL-94 study.