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<p>Magnesium-rare earth alloys are considered potential candidates for sacrificial anode applications due to their high electrochemical activity and low density. This study investigates the effect of friction stir processing (FSP) on the microstructural development and corrosion characteristics of a Mg–1Er–1Pr alloy to evaluate its suitability for specific applications. FSP was performed under single-pass (S1) and double-pass (S2) conditions, resulting in a substantial reduction of grain size from approximately 243 µm in the base material to about 53 µm (S1) and further to around 15 µm (S2). Despite effective grain refinement, the processed alloy exhibited diminished corrosion resistance and electrochemical stability performance. A detailed characterization, including phase analysis, microhardness testing, electrochemical studies, and corrosion kinetics, was performed. The microhardness of the stir zone increased from 56 HV (S1) to 62 HV (S2) compared to the base material. Electrochemical measurements revealed a high corrosion current density and an anodic efficiency of less than 30 pct, showing inadequate corrosion resistance. The results indicate that although FSP enhances the microstructural characteristics and mechanical properties, the Mg–1Er–1Pr alloy has limited applicability as a sacrificial anode.</p>

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Influence of Friction Stir Processing on the Microstructure, Texture, and Sacrificial Anodic Performance of Mg–1Er–1Pr Alloy

  • 期刊论文

  • 发表日期：

    2025年7月21日

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  • Selvakumar Duraisamy,
  • P. Sathiya,
  • R. Vaira Vignesh

摘要

Magnesium-rare earth alloys are considered potential candidates for sacrificial anode applications due to their high electrochemical activity and low density. This study investigates the effect of friction stir processing (FSP) on the microstructural development and corrosion characteristics of a Mg–1Er–1Pr alloy to evaluate its suitability for specific applications. FSP was performed under single-pass (S1) and double-pass (S2) conditions, resulting in a substantial reduction of grain size from approximately 243 µm in the base material to about 53 µm (S1) and further to around 15 µm (S2). Despite effective grain refinement, the processed alloy exhibited diminished corrosion resistance and electrochemical stability performance. A detailed characterization, including phase analysis, microhardness testing, electrochemical studies, and corrosion kinetics, was performed. The microhardness of the stir zone increased from 56 HV (S1) to 62 HV (S2) compared to the base material. Electrochemical measurements revealed a high corrosion current density and an anodic efficiency of less than 30 pct, showing inadequate corrosion resistance. The results indicate that although FSP enhances the microstructural characteristics and mechanical properties, the Mg–1Er–1Pr alloy has limited applicability as a sacrificial anode.