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<p>The anodic dissolution of molybdenum in an alkaline solution containing H<sub>2</sub>O<sub>2</sub> as an oxidizer was investigated using various electrochemical techniques such as potentiodynamic polarization and electrochemical impedance spectroscopy. The polarization measurements showed no evidence of passivation. Further, the impedance data acquired at various DC overpotentials were analyzed using an electrical equivalent circuit (EEC) and reaction mechanism analysis (RMA) approaches. The surface characteristics were also studied using FESEM, and the uniform corrosion behavior was observed. The dissolution mechanism with three intermediate adsorbates (<i>Mo</i><sup><i>2+</i></sup>,<i> Mo</i><sup><i>4+</i></sup><i>and Mo</i><sup><i>6+</i></sup>) and two dissolution paths (electrochemical and chemical) is proposed to predict the Mo dissolution in the presence of H<sub>2</sub>O<sub>2</sub> at alkaline pH. RMA analysis suggests that the dissolution via the electrochemical reaction pathway is the predominant step. Further, the surface coverage of all the intermediate adsorbates is estimated which reveals that oxides of Mo with a + 6-oxidation state are mainly occupied on the metal surface. XPS analysis of the corrosion product confirmed the formation of oxides of Mo. Both FESEM and XPS measurements substantiated the findings from the RMA analysis.</p>

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Investigation on Anodic Dissolution of Mo in Alkaline Solutions Containing Oxidizer (H2O2) via Electrochemical Impedance Spectroscopy: A Mechanistic Analysis

  • 期刊论文

  • 发表日期：

    2025年8月14日

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  • Sayani Adhikari,
  • Prasanna Venkatesh Rajaraman

摘要

The anodic dissolution of molybdenum in an alkaline solution containing H2O2 as an oxidizer was investigated using various electrochemical techniques such as potentiodynamic polarization and electrochemical impedance spectroscopy. The polarization measurements showed no evidence of passivation. Further, the impedance data acquired at various DC overpotentials were analyzed using an electrical equivalent circuit (EEC) and reaction mechanism analysis (RMA) approaches. The surface characteristics were also studied using FESEM, and the uniform corrosion behavior was observed. The dissolution mechanism with three intermediate adsorbates (Mo2+, Mo4+and Mo6+) and two dissolution paths (electrochemical and chemical) is proposed to predict the Mo dissolution in the presence of H2O2 at alkaline pH. RMA analysis suggests that the dissolution via the electrochemical reaction pathway is the predominant step. Further, the surface coverage of all the intermediate adsorbates is estimated which reveals that oxides of Mo with a + 6-oxidation state are mainly occupied on the metal surface. XPS analysis of the corrosion product confirmed the formation of oxides of Mo. Both FESEM and XPS measurements substantiated the findings from the RMA analysis.