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<p>This study addresses the problem of oxygen corrosion in saltwater by developing a binary inhibitor composed of 3,5-diamino-1,2,4-triazole (DTA) and sodium citrate (TSC). The optimal ratio and dosage of DTA to TSC were ascertained using the weight-loss method. The corrosion inhibition efficacy of the DTA-TSC combination was assessed through electrochemical techniques and surface analysis. Additionally, quantum chemical calculations were employed to explore the structure–activity relationship between the inhibitor and the steel surface. Results from the weight-loss experiment suggest an optimal DTA to TSC ratio of 4:1. With a combined dosage of 300&#xa0;mg/L, the corrosion inhibition rate achieves 90.21%, markedly decreasing the corrosion rate from 0.2393&#xa0;mm/a to 0.025&#xa0;mm/a. Electrochemical evaluations indicate that DTA-TSC predominantly suppresses cathodic reactions. Both scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) analyses reveal that DTA-TSC establishes chemical bonds with Fe–N and Fe–O on the steel surface, leading to a notably smoother steel surface. Quantum chemical computations further elucidate that DTA functions as an electron donor, whereas TSC serves as an electron acceptor, both forming chemical bonds with Fe atoms and establishing an adsorption film. In conclusion, the DTA-TSC binary inhibitor proves effective in mitigating the corrosion of A3 carbon steel in oxygenated saltwater.</p>

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Corrosion Inhibition Performance and Mechanism of 3,5-Diamino-1,2,4-Triazole and Sodium Citrate on Carbon Steel in Oxygenated Saline

  • 期刊论文

  • 发表日期：

    2026年2月18日

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  • Zigang Lei,
  • Yonghui Song,
  • Wanheng Liu,
  • Chengxian Yin,
  • Yuan Wang,
  • Yinyin Guo,
  • Xinwei Zhang

摘要

This study addresses the problem of oxygen corrosion in saltwater by developing a binary inhibitor composed of 3,5-diamino-1,2,4-triazole (DTA) and sodium citrate (TSC). The optimal ratio and dosage of DTA to TSC were ascertained using the weight-loss method. The corrosion inhibition efficacy of the DTA-TSC combination was assessed through electrochemical techniques and surface analysis. Additionally, quantum chemical calculations were employed to explore the structure–activity relationship between the inhibitor and the steel surface. Results from the weight-loss experiment suggest an optimal DTA to TSC ratio of 4:1. With a combined dosage of 300 mg/L, the corrosion inhibition rate achieves 90.21%, markedly decreasing the corrosion rate from 0.2393 mm/a to 0.025 mm/a. Electrochemical evaluations indicate that DTA-TSC predominantly suppresses cathodic reactions. Both scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) analyses reveal that DTA-TSC establishes chemical bonds with Fe–N and Fe–O on the steel surface, leading to a notably smoother steel surface. Quantum chemical computations further elucidate that DTA functions as an electron donor, whereas TSC serves as an electron acceptor, both forming chemical bonds with Fe atoms and establishing an adsorption film. In conclusion, the DTA-TSC binary inhibitor proves effective in mitigating the corrosion of A3 carbon steel in oxygenated saltwater.