Corrosion Inhibition Performance of Syringaldehyde–1,4-Phenylenediamine Schiff Base on Mild Steel in Different Acidic Media
DOI:
https://doi.org/10.54097/y49jr322Keywords:
Schiff base, mild steel, acidic medium, corrosion inhibition performance, electrochemical method, weight loss methodAbstract
To investigate the corrosion inhibition performance of syringaldehyde–1,4-phenylenediamine Schiff base on mild steel in different acidic media, syringaldehyde and 1,4-phenylenediamine were used as raw materials to prepare syringaldehyde–1,4-phenylenediamine Schiff base (SPSB), and its structure was characterized by nuclear magnetic resonance. Electrochemical methods (electrochemical impedance spectroscopy and potentiodynamic polarization curves) and the static weight loss method were employed to study the corrosion inhibition behavior of this Schiff base on mild steel in four acidic media (4.44 M HCl, 2.22 M H₂SO₄, 1 M HCl, 0.5 M H₂SO₄) at 25 °C. The results show that, under the same hydrogen ion concentration, the inhibition efficiency of SPSB for mild steel in 4.44 M HCl is higher than that in 2.22 M H₂SO₄, and the inhibition efficiency in 1 M HCl is higher than that in 0.5 M H₂SO₄; within the same acid medium, the inhibition efficiency in high-concentration acid systems is significantly higher than that in low-concentration systems, i.e., the inhibition efficiency in 4.44 M HCl is higher than that in 1 M HCl, and that in 2.22 M H₂SO₄ is higher than that in 0.5 M H₂SO₄.
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