Synthesis and Characterization of New Schiff Base Derivatives from Quinazolinone Moiety and Studying Their Properties as Potential Corrosion Inhibitors

A new series of Schiff base derivatives of quinazoline core were synthesized through the reaction of quinazoline derivative A with different substituted aromatic aldehydes to produce compounds 1–4. The new Schiff base derivatives 1–4 were obtained in high yields and characterized using various techniques including FTIR, ¹H‑NMR, and ¹³C-NMR. Compounds 1–4 were studied as corrosion inhibitors for carbon steel 45 using polarization curves. Various thermal and kinetic parameters were also examined to better understand the corrosion process and inhibition mechanism of these compounds. All compounds demonstrated excellent corrosion inhibition properties, and the results were corroborated by X-ray diffraction and AFM techniques.