Technical Note: Detection of Soluble Species Released During Metal Corrosion in High-Temperature Aqueous Solutions

Authors:
  • TLT. Laitinen
    T. Laitinen
  • KMK. Mäkelä
    K. Mäkelä
  • MMM. Mäkelä
    M. Mäkelä
  • TST. Saario
    T. Saario
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Abstract
This work demonstrates the use of a novel wall-jet ring-disc (WJRD) configuration to detect soluble species released as end products or as reaction intermediates in metal corrosion in high-temperature aqueous environments. This wall-jet configuration is based on a recent controlled-distance electrochemistry (CDE) arrangement. It is shown to give qualitatively similar results at room temperature to those obtained using a conventional rotating ring-disc electrode (RRDE) technique. Measurements also showed that the transpassive dissolution of Cr from pure Cr, Fe-Cr, and Fe-Cr-Mo alloys can be detected at elevated temperatures (up to 288°C) by using the present WJRD configuration. The transpassive dissolution of Cr increased with increasing Mo content of the alloy. In addition, the flow rate of the electrolyte was found to influence the stability of oxide films formed on the studied material as well as the collection efficiency for the soluble species. To improve the quantitativeness of the results, further optimization of the flow conditions and the electrode configuration is in progress.

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