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Mild steel is widely used in chemical and construction applications, and most of the chemical equipment and construction equipment made of mild steel are in direct contact with the environment or used in acidic environments, so they are very easy to be corroded. The economic loss caused by mild steel corrosion accounts for about 3% of the country’s GDP every year, so it is urgent to curb mild steel corrosion. In this study, salicylaldehyde and m-phenylenediamine synthesis salicylaldehyde-m-phenylenediamine double Schiff base (SPDS), and the corrosion inhibition performance of salicylaldehyde in 1 M HCl was evaluated by electrochemical method (impedance spectroscopy polarization method) and static weight loss method. The experimental results show that SPDS is a mixed corrosion inhibitor, and its corrosion inhibition effect is positively correlated with concentration and its inhibition effect is positively correlated with concentration and negatively with temperature. At a temperature of 30 °C and a concentration of 4 mmol/L, SPDS had the best inhibition effect of mild steel in 1 M HCl, with 96.7% inhibition effect.

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Experimental Study of a Low-Cost Schiff Base as a High-Efficiency Corrosion Inhibitor for Mild Steel in 1 M HCl

  • 会议论文

  • 发表日期：

    2026年

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  • Xiaotong Zeng,
  • Yuanfang Deng,
  • Xiaolong Li,
  • Yanxi Yu,
  • Junxing Zhao,
  • Changbing Qiao,
  • Fangde Fan,
  • Bing Yi,
  • Yutong Wei,
  • Jing Zhou,
  • Junlan Li,
  • Jiajun He,
  • Wenjun Zhang,
  • Chuntan Chen,
  • Chuan Lai

摘要

Mild steel is widely used in chemical and construction applications, and most of the chemical equipment and construction equipment made of mild steel are in direct contact with the environment or used in acidic environments, so they are very easy to be corroded. The economic loss caused by mild steel corrosion accounts for about 3% of the country’s GDP every year, so it is urgent to curb mild steel corrosion. In this study, salicylaldehyde and m-phenylenediamine synthesis salicylaldehyde-m-phenylenediamine double Schiff base (SPDS), and the corrosion inhibition performance of salicylaldehyde in 1 M HCl was evaluated by electrochemical method (impedance spectroscopy polarization method) and static weight loss method. The experimental results show that SPDS is a mixed corrosion inhibitor, and its corrosion inhibition effect is positively correlated with concentration and its inhibition effect is positively correlated with concentration and negatively with temperature. At a temperature of 30 °C and a concentration of 4 mmol/L, SPDS had the best inhibition effect of mild steel in 1 M HCl, with 96.7% inhibition effect.