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<p>This study investigates the influence of Friction Stir Processing (FSP) on the electrochemical performance, sacrificial efficiency, and microstructural characteristics of a Mg-1Er-1Nd alloy, aiming to enhance its application as a sacrificial anode in marine environments. Surface modification via FSP resulted in refined grain structures from ~ 700&#xa0;μm in the base material to 5.16&#xa0;μm and increasing the fraction of high-angle grain boundaries from 18.3% to 24.6%. Electrochemical testing revealed a positive shift in corrosion potential (E<sub>corr</sub>) from − 1.45&#xa0;V vs. SCE in the base material (BM) to more noble values in the FSP-treated specimens, indicating superior corrosion resistance. Sacrificial efficiency improved markedly, with FSP specimens reaching ~ 8.4% efficiency compared to ~ 1.51% in the BM, confirming enhanced anodic protection capability. Surface characterization indicated increased formation of magnesium oxide/hydroxide on FSP-treated surfaces, contributing to higher surface stability and resistance to localized corrosion. Additionally, microhardness increased from 42 ± 3 (BM) to 55 ± 5 HV (FSP), attributed to grain refinement and uniform distribution of secondary phase particles.</p> Graphical abstract <p></p>

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Electrochemically active anodes of surface-modified Mg-Er-Nd alloy for marine structures

  • 期刊论文

  • 发表日期：

    2026年6月15日

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  • B. Ganesh,
  • B. Harish,
  • Shashank Rajiv Srinivasan,
  • R. Vaira Vignesh,
  • P. Sathiya

摘要

This study investigates the influence of Friction Stir Processing (FSP) on the electrochemical performance, sacrificial efficiency, and microstructural characteristics of a Mg-1Er-1Nd alloy, aiming to enhance its application as a sacrificial anode in marine environments. Surface modification via FSP resulted in refined grain structures from ~ 700 μm in the base material to 5.16 μm and increasing the fraction of high-angle grain boundaries from 18.3% to 24.6%. Electrochemical testing revealed a positive shift in corrosion potential (Ecorr) from − 1.45 V vs. SCE in the base material (BM) to more noble values in the FSP-treated specimens, indicating superior corrosion resistance. Sacrificial efficiency improved markedly, with FSP specimens reaching ~ 8.4% efficiency compared to ~ 1.51% in the BM, confirming enhanced anodic protection capability. Surface characterization indicated increased formation of magnesium oxide/hydroxide on FSP-treated surfaces, contributing to higher surface stability and resistance to localized corrosion. Additionally, microhardness increased from 42 ± 3 (BM) to 55 ± 5 HV (FSP), attributed to grain refinement and uniform distribution of secondary phase particles.

Graphical abstract