An example of green copper corrosion inhibitors derived from flavor and medicine: Vanillin and isoniazid

The use of some industrial materials such as medicine and flavor in the anti-corrosion field is an attractive topic. A Schiff base (N-isonicotinamido-3-methoxy-4-hydroxybenzalaldimine, IM) based on flavor (vanillin) and medicine (isoniazid) has been synthesized and utilized as a green corrosion inhibitor for copper in NaCl media. Electrochemical techniques are employed to analyze its inhibition property. The copper surface is characterized by scanning electron microscopy, infrared spectroscopy, and energy-dispersive X-ray spectroscopy. IM acts as an anodic inhibitor and its inhibition efficiency is up to 93% at 120 mg/L and more remarkable than its corresponding reactants. With a large molecular surface area and better electron donation ability, IM has a better corrosion inhibition performance and may be adsorbed on the copper surface through-NH and -C=N groups, according to theoretical studies, (c) 2017 Elsevier B.V. All rights reserved.