Pyranopyrazole derivative, a new corrosion inhibitor designed for managing the corrosion problem of aluminum metal in alkaline solution

Abstract

The current study addresses the corrosion issue for aluminum metal in alkaline solution (4.0 M NaOH) by employing a novel corrosion inhibitor, 6-amino-4-(4-hydroxyphenyl)-3-methyl-1-phenyl-1,4-dihydropyrano[2,3-c]pyrazole-5-carbonitrile (PYPY). Analyses techniques using the FTIR, NMR, HPLC, mass spectrometry (MS) and elemental analysis confirmed that the PYPY was successfully synthesized. Chemical, electrochemical, and quantum research are used to assess (PYPY)'s anti-corrosion characteristics. The data confirms that PYPY plays a significant role in preventing aluminum from corroding in NaOH solution. At 100 ppm, the maximum levels of inhibitory efficacy (92.5%) were attained. The primary cause of PYPY's anti-corrosion properties is the propensity of PYPY to adsorb on the aluminium surface via its hetero atoms (O, N, and π-electron conjugation). Scanning electron microscopy (SEM) test results corroborated this. The actual adsorption occurs due to the synchronization of several active centres and physical and chemical processes with the calculated quantum parameters. Furthermore, PYPY adsorption follows the Langmuir isotherm.