Abstract
Corrosion of mild steel in acidic environments poses significant challenges in various industrial applications. The aim of this research is to find an eco-friendly inhibitor from 4-(4-nitrophenyl)-6-(3,4,5-trimethoxyphenyl)pyrimidin-2-amine. In the current study, we investigated the effectiveness of a pyrimidine derivative as a potential corrosion inhibitor for mild steel in acidic medium. A heterocyclic compound named 4-(4-nitrophenyl)-6-(3,4,5-trimethoxyphenyl)pyrimidin-2-amine was investigated for their inhibitory efficiencies against the corrosion of mild steel in HCl 1.0 M medium using weight loss measurements. The experiment was carried out at five different concentrations (0.01, 0.02, 0.03, 0.04, and 0.05 g per 150 mL) and it was observed that as the concentration of the inhibitor increased, the inhibitor efficiency also increased. The corrosion inhibition efficiency of the synthesized derivative was also assessed at different temperatures to understand its effectiveness under varying conditions. The optimum inhibition efficiency observed in Hydrochloric acid was 72.91%. Furthermore, it was observed that the adsorption of the 4-(4-nitrophenyl)-6-(3,4,5-trimethoxyphenyl)pyrimidin-2-amine on steel surface depends on its physico-chemicals properties, electronic density of the donor atom and possible interaction of its -orbitals with the d-orbitals of the surface atom. And as the temperature increased, there was a decreased inhibition efficiency. The adsorption of 4-(4-nitrophenyl)-6-(3,4,5-trimethoxyphenyl)pyrimidin-2-amine on steel surface followed the Langmuir adsorption isotherm. After intensive hours of study, it was concluded that the pyrimidine derivative used above is an efficient corrosion inhibitor as this will reduce the cost of importation, and make the environment free of toxic chemical inhibitor. This research demonstrates the potential of pyrimidine as effective corrosion inhibitors, offering valuable insights into their application in mitigating corrosion in acidic environments.
