Synthesis and Corrosion Inhibition Performance Evaluation of 4-Pyridinecarboxaldehyde-1,4-phenylenediamine Mono-Schiff Base

Yuanfang Deng; Junlan Li; Yue Li; Yutong Wei; Li Li; Yu Zhang; Jiawang Shen; Jing Zhou; Chuan Lai; Ting Long

doi:10.6919/ICJE.202511_11(11).0001

Authors

Yuanfang Deng
Junlan Li
Yue Li
Yutong Wei
Li Li
Yu Zhang
Jiawang Shen
Jing Zhou
Chuan Lai
Ting Long

DOI:

https://doi.org/10.6919/ICJE.202511_11(11).0001

Keywords:

Corrosion; Corrosion Inhibitor; Mono-Schiff Base; Mild Steel; Corrosion Inhibition Performance.

Abstract

A planar rigid mono-Schiff base corrosion inhibitor, 4-pyridinecarboxaldehyde-1,4-phenylenediamine (PAM-4), was synthesized in this work. Nuclear magnetic resonance (NMR) spectroscopy confirmed the structure of the compound. The inhibitory effect of PAM-4 on mild steel in 1 mol/L HCl at 25°C, 35°C, and 45°C was assessed through weight loss measurements and electrochemical techniques. Scanning electron microscopy (SEM) was used to examine the surface morphology of mild steel before and after corrosion, demonstrating that PAM-4 provides effective protection. The results reveal that inhibitor concentration and temperature are key factors influencing performance. Inhibition efficiency improved with increasing PAM-4 concentration, achieving a maximum of 91.51% at 1600 mg/L. Conversely, elevated temperatures reduced the inhibition effect.

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