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<p>This study introduced an electropolishing technique that utilized oxygen bubbles generated in situ to enhance surface finishing without the need for mechanical stirring. The method was designed to simplify the process while improving efficiency and uniformity in metal surface treatment. Experimental results showed that agitation induced by oxygen bubbles significantly enhanced the mass transfer coefficient. The enhancement ratio ranged from 1.37 to 14 compared to the value under natural convection, depending on phosphoric acid concentration and oxygen discharge velocity. The effects of electrolyte concentration, applied current density, oxygen discharge velocity, and anode orientation (vertical and horizontal) were systematically investigated. A simplified model based on the analogy between gas stirring and natural convection was proposed to explain the results. Anode orientation was found to have a negligible effect on the mass transfer coefficient. Compared to conventional approaches, this method offered a more energy-efficient and mechanically simpler alternative, highlighting its potential for scalable industrial applications.</p> Graphical abstract <p></p>

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Mass transfer intensification in electropolishing using in-situ oxygen bubble evolution

  • 期刊论文

  • 发表日期：

    2025年9月13日

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  • Magdy Zaki,
  • Ahmed Amin Zatout,
  • Ibrahim Salem Mansour,
  • Gomaa H. Sedahmed,
  • Mohamed Helmy Abdel-Aziz,
  • El-Sayed Zakaria El-Ashtoukhy,
  • Samah Mustafa

摘要

This study introduced an electropolishing technique that utilized oxygen bubbles generated in situ to enhance surface finishing without the need for mechanical stirring. The method was designed to simplify the process while improving efficiency and uniformity in metal surface treatment. Experimental results showed that agitation induced by oxygen bubbles significantly enhanced the mass transfer coefficient. The enhancement ratio ranged from 1.37 to 14 compared to the value under natural convection, depending on phosphoric acid concentration and oxygen discharge velocity. The effects of electrolyte concentration, applied current density, oxygen discharge velocity, and anode orientation (vertical and horizontal) were systematically investigated. A simplified model based on the analogy between gas stirring and natural convection was proposed to explain the results. Anode orientation was found to have a negligible effect on the mass transfer coefficient. Compared to conventional approaches, this method offered a more energy-efficient and mechanically simpler alternative, highlighting its potential for scalable industrial applications.

Graphical abstract