Abstract
This study evaluates 4-(4-Chlorobenzylideneamino) antipyrine as an organic corrosion inhibitor for mild steel in 1.0 M HCl using weight-loss measurements and SEM surface analysis. The inhibitor produced a clear concentration-dependent protection effect: the corrosion rate decreased from 0.452 mpy for the uninhibited solution to 0.014 mpy at 500 ppm, while the inhibition efficiency increased from 41.84% at 100 ppm to 96.90% at 500 ppm. The adsorption data followed the Langmuir adsorption isotherm, indicating the formation of a protective adsorbed layer on the steel surface. The calculated Δ Gads value of approximately -29.78 kJ mol-1 suggests spontaneous mixed adsorption involving both physical and chemical contributions. SEM observations confirmed that the inhibited surface was smoother and less damaged than the severely corroded uninhibited surface. The novelty of the work lies in providing a focused gravimetric and surface-morphology evaluation of a structurally defined antipyrine derivative as a sustainable inhibitor for acidic mild-steel corrosion.
Recommended Citation
Khalaf, Mohanad Muzahem; Mustafa, A. M.; and Abdulhasan, Ayad Abbood
(2026)
"Renewable Research Frontiers in the Weight-Loss Evaluation of 4-(4-Chlorobenzylideneamino) Antipyrine as an Eco-Friendly Corrosion Inhibitor for Mild Steel in HCl,"
AUIQ Conference Proceedings: Vol. 2:
Iss.
1, Article 6.
DOI: https://doi.org/10.70176/3107-2682.1014
Available at:
https://acp.alayen.edu.iq/journal/vol2/iss1/6
