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<p>Iron cultural relics are susceptible to electrochemical corrosion from soluble salts, making desalination critical for their long-term conservation. However, existing judgment methods for desalination necessity mostly rely on chloride tests in solution, lacking portable and rapid detection means. This study introduces the Elcometer 138 Bresle salt contamination meter to cultural relic salt damage research. Simulation experiments prove its applicability to iron, copper, and porcelain relics, with detection data verified by p‑XRF, portable conductivity meters, IC, and ICP-MS. Through simulated corrosion tests on iron specimens, a conductivity threshold for severe/mild corrosion was determined. A safe soluble salt threshold for Chongqing’s unearthed ancient iron artifacts requiring no desalination was preliminarily established: surface conductivity &lt;151 μS/cm. It supports scientific conservation, cuts unnecessary desalination, and avoids over-restoration risks.</p>

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Study on desalination threshold of ancient iron artifacts based on surface conductivity measurement

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月28日

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  • Wenhua Zhao,
  • Lin Ye,
  • Laiyuan Gu,
  • Guoqiong Lv,
  • Jiujiang Bai

摘要

Iron cultural relics are susceptible to electrochemical corrosion from soluble salts, making desalination critical for their long-term conservation. However, existing judgment methods for desalination necessity mostly rely on chloride tests in solution, lacking portable and rapid detection means. This study introduces the Elcometer 138 Bresle salt contamination meter to cultural relic salt damage research. Simulation experiments prove its applicability to iron, copper, and porcelain relics, with detection data verified by p‑XRF, portable conductivity meters, IC, and ICP-MS. Through simulated corrosion tests on iron specimens, a conductivity threshold for severe/mild corrosion was determined. A safe soluble salt threshold for Chongqing’s unearthed ancient iron artifacts requiring no desalination was preliminarily established: surface conductivity <151 μS/cm. It supports scientific conservation, cuts unnecessary desalination, and avoids over-restoration risks.