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<p>Zn-W coatings (W = 2, 4, 6, 9 wt.%) were electrodeposited onto mild steel to investigate coating’s corrosion resistance and hydrogen permeation behavior. The Zn-2 wt.% W coating exhibited highest resistance to hydrogen permeation (saturated permeation current = 0.71&#xa0;μA/cm<sup>2</sup>) and corrosion (corrosion rate = 5.28&#xa0;μA/cm<sup>2</sup>) due to relatively passive Zn-W solid solution phase and low coating strain. Zn-6 wt.% W coatings offered least resistance to hydrogen permeation (saturated permeation current = 5.47&#xa0;μA/cm<sup>2</sup>) and corrosion (corrosion rate = 44.25&#xa0;μA/cm<sup>2</sup>) because of evolution of W-enriched clusters within Zn matrix which induced galvanic coupling and facilitated hydrogen diffusion through the heterophase interface.</p>

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High Resistance to Corrosion and Hydrogen Permeation Due to Tungsten Partitioning Induced Phase and Strain Evolution in Electrodeposited Zinc–Tungsten Coatings

  • 期刊论文

  • 发表日期：

    2025年4月14日

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  • D. V. Praveen Kumar,
  • G. Mohan Kumar,
  • Akhand Pratap Singh,
  • S. Roohan Farooq Lala,
  • Chandan Srivastava

摘要

Zn-W coatings (W = 2, 4, 6, 9 wt.%) were electrodeposited onto mild steel to investigate coating’s corrosion resistance and hydrogen permeation behavior. The Zn-2 wt.% W coating exhibited highest resistance to hydrogen permeation (saturated permeation current = 0.71 μA/cm2) and corrosion (corrosion rate = 5.28 μA/cm2) due to relatively passive Zn-W solid solution phase and low coating strain. Zn-6 wt.% W coatings offered least resistance to hydrogen permeation (saturated permeation current = 5.47 μA/cm2) and corrosion (corrosion rate = 44.25 μA/cm2) because of evolution of W-enriched clusters within Zn matrix which induced galvanic coupling and facilitated hydrogen diffusion through the heterophase interface.