Gravimetric and Density Functional Theory Investigations on 4-Amioantipyrin Schiff Base as an Inhibitor for Mild Steel in HCl Solution

Metal corrosion, in general, is a serious economic problem. One of the most effective ways to prevent corrosion on metal surfaces is to use corrosion inhibitors, especially green organics. Here, the effects of concentration, exposure time, and temperature on the antiproliferative ability of 4- aminoantipyrine derivative were investigated. The 4-aminoantipyrine derivative showed significant corrosion resistance to mild steel melting in a 1M hydrochloric acid environment, as observed from the weight loss method. At 303 K and a dose of 500 ppm, the maximum inhibitory efficacy of the 4-aminoantipyrine derivative was 96.1 %. Corrosion test results showed that the 4-aminoantipyrine derivative has an inhibitory effect of more than 88 % at the concentration of 400 ppm and inhibits corrosion through an adsorption mechanism. The inhibitory potency of the 4-aminoantipyrine derivative changed inversely with a long exposure time, while temperature affected it directly. The Langmuir model was used to control the physical and chemical adsorption of its 4-aminoantipyrine derivative as a corrosion inhibitor on metallic surfaces. Data from density functional theory simulations help bridge the gap between theoretical studies and experimental approaches.