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<p>Steels in seawater medium corrode at a rate proportional to the severity of the environmental factors and water chemistry. Evaluating the influence of each contributing factor toward corrosion, especially in an uncontrolled seawater environment (such as oceans/other seawater reservoirs), often becomes more challenging due to the complex interdependent relationship among the corrosion influencing environmental factors and their net affect toward the&#xa0;steel corrosion. This paper evaluates the influence of seawater temperature and salinity on the corrosion behavior of S-275 steel by exposing samples&#xa0;to the artificial seawater solutions, for a duration up to a maximum of 365&#xa0;days. Corrosion losses and pit depths were measured using a novel dimensional metrology method integrated with an optical microscope and image analyzer, whereas the rust deposits were characterized using SEM, EDS mapping, XRD and Raman spectroscopy. The corrosion experiments resulted around 3-5 times higher corrosion rates and pit depths on steel samples at a relatively higher seawater temperature of 40&#xa0;°C than those exposed to similar seawater compositions at 18&#xa0;°C. Overall, the corrosion rates and the rust phases were found to be comparable to those previously reported in the literature on steels exposed to the natural seawater in the Arabian Sea. Hints of anaerobic corrosion activities were also identified during the extended exposure durations.</p>

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Investigating Corrosion Behavior of a Ship Structural Steel (S-275) under Different Artificial Seawater Compositions and Characterization of Rust Deposits

  • 期刊论文

  • 发表日期：

    2025年4月17日

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  • Muntazir Abbas,
  • Qamar Abbas,
  • Syed Haider Mehdi Rizvi

摘要

Steels in seawater medium corrode at a rate proportional to the severity of the environmental factors and water chemistry. Evaluating the influence of each contributing factor toward corrosion, especially in an uncontrolled seawater environment (such as oceans/other seawater reservoirs), often becomes more challenging due to the complex interdependent relationship among the corrosion influencing environmental factors and their net affect toward the steel corrosion. This paper evaluates the influence of seawater temperature and salinity on the corrosion behavior of S-275 steel by exposing samples to the artificial seawater solutions, for a duration up to a maximum of 365 days. Corrosion losses and pit depths were measured using a novel dimensional metrology method integrated with an optical microscope and image analyzer, whereas the rust deposits were characterized using SEM, EDS mapping, XRD and Raman spectroscopy. The corrosion experiments resulted around 3-5 times higher corrosion rates and pit depths on steel samples at a relatively higher seawater temperature of 40 °C than those exposed to similar seawater compositions at 18 °C. Overall, the corrosion rates and the rust phases were found to be comparable to those previously reported in the literature on steels exposed to the natural seawater in the Arabian Sea. Hints of anaerobic corrosion activities were also identified during the extended exposure durations.