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<p>This study investigates the relationship between microstructure, hydrogen diffusion, and corrosion resistance in cold sprayed (CS) 410L stainless steel (CS410L). Scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) were used for microstructural analysis, while electrochemical methods assessed hydrogen transport and corrosion performance compared to wrought 410L (W410L). Although studies on the hydrogen trapping steels exist in literature, understanding the influence of the CS microstructure on hydrogen diffusion is crucial before implementation. Analysis of the CS microstructure revealed grain refinement at prior particle boundaries (PPB), while grains among the interior remained coarse though highly strained. Hydrogen permeation results indicated a significant drop in diffusivity in CS deposit, due to increased defect density and heterogenous microstructure. Significant hydrogen trapping at PPB was revealed by silver decoration in CS deposit, while trapping in W410L occurred at precipitate/matrix interfaces. Electrochemical results of CS410L exhibited no passivity and corroded actively in 0.1&#xa0;M NaCl, while W410L exhibited passivity. Immersion studies demonstrated corrosion initiation and significant propagation along PPBs in CS deposit, in contrast to limited surface degradation in W410L. However, under high alkaline conditions (pH &gt; 12) CS410L exhibited a comparable corrosion performance. Findings highlight CS-induced microstructural defects govern both hydrogen transport and corrosion resistance.</p>

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Effect of Cold Spray on Environmental Corrosion Impacts of Ferritic Stainless Steel 410L

  • 期刊论文

  • 发表日期：

    2025年10月21日

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  • Yoel Emun,
  • Kyle Johnson,
  • Gregory W. Kubacki

摘要

This study investigates the relationship between microstructure, hydrogen diffusion, and corrosion resistance in cold sprayed (CS) 410L stainless steel (CS410L). Scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) were used for microstructural analysis, while electrochemical methods assessed hydrogen transport and corrosion performance compared to wrought 410L (W410L). Although studies on the hydrogen trapping steels exist in literature, understanding the influence of the CS microstructure on hydrogen diffusion is crucial before implementation. Analysis of the CS microstructure revealed grain refinement at prior particle boundaries (PPB), while grains among the interior remained coarse though highly strained. Hydrogen permeation results indicated a significant drop in diffusivity in CS deposit, due to increased defect density and heterogenous microstructure. Significant hydrogen trapping at PPB was revealed by silver decoration in CS deposit, while trapping in W410L occurred at precipitate/matrix interfaces. Electrochemical results of CS410L exhibited no passivity and corroded actively in 0.1 M NaCl, while W410L exhibited passivity. Immersion studies demonstrated corrosion initiation and significant propagation along PPBs in CS deposit, in contrast to limited surface degradation in W410L. However, under high alkaline conditions (pH > 12) CS410L exhibited a comparable corrosion performance. Findings highlight CS-induced microstructural defects govern both hydrogen transport and corrosion resistance.