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<p>The corrosion of buried steel pipelines is influenced by soil acidity from heavy rainfall and ammonium sulfate (ZA) fertilizers. Despite extensive research on soil corrosion resistance, studies on the combined effects of pH and fertilizers, particularly in Indonesia, are limited. This study examines X60 steel corrosion in Indonesian soils with varying ZA concentrations and pH using scanning electron microscopy (SEM), Tafel polarization, and electrochemical impedance spectroscopy (EIS). SEM analysis identifies magnetite, goethite, and lepidocrocite as main corrosion products. Corrosion rates decrease as soil pH increases from 5 to 7 at all ZA concentrations. Initial corrosion rates peak at 0.3&#xa0;mm/y in the first two months, dropping to 0.14&#xa0;mm/y over four months, as shown by weight loss and Tafel analysis. EIS results indicate higher polarization resistance (Rp) with increasing pH, while Rp decreases with higher ZA concentrations, highlighting the importance of understanding pH-fertilizer interactions for effective corrosion control.</p>

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Unveiling the Combined Effects of Soil Acidity and Ammonium Sulfate on the Corrosion Behavior of X60 Steel Pipelines in Indonesian Regions

  • 期刊论文

  • 发表日期：

    2025年1月11日

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  • Asep Ridwan Setiawan,
  • Putri Intan Usi Fausia,
  • Miftahul Jannah,
  • Aditianto Ramelan

摘要

The corrosion of buried steel pipelines is influenced by soil acidity from heavy rainfall and ammonium sulfate (ZA) fertilizers. Despite extensive research on soil corrosion resistance, studies on the combined effects of pH and fertilizers, particularly in Indonesia, are limited. This study examines X60 steel corrosion in Indonesian soils with varying ZA concentrations and pH using scanning electron microscopy (SEM), Tafel polarization, and electrochemical impedance spectroscopy (EIS). SEM analysis identifies magnetite, goethite, and lepidocrocite as main corrosion products. Corrosion rates decrease as soil pH increases from 5 to 7 at all ZA concentrations. Initial corrosion rates peak at 0.3 mm/y in the first two months, dropping to 0.14 mm/y over four months, as shown by weight loss and Tafel analysis. EIS results indicate higher polarization resistance (Rp) with increasing pH, while Rp decreases with higher ZA concentrations, highlighting the importance of understanding pH-fertilizer interactions for effective corrosion control.