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<p>The effect of the barrier oxide film as a passivation layer grown by anodizing on the corrosion resistance of stainless steel after immersion in a 3.5 wt% NaCl solution for 200&#xa0;days was investigated. Before immersion testing, SUS 316L alloy was anodized using an ethylene glycol solution containing NH<sub>4</sub>F and H<sub>2</sub>O. The anodized SUS 316L at 70&#xa0;V exhibited a higher corrosion potential and pitting potential, a lower corrosion current density, and a corrosion inhibition efficiency of 72.24% compared to untreated SUS 316L. After immersion testing, the surface-to-corrosion depth increased by 3.6 times for untreated SUS 316L and by 2.1 times for anodized SUS 316L at 70&#xa0;V. Additionally, anodized SUS 316L at 70&#xa0;V exhibits a lower corrosion current density and less weight loss than untreated SUS 316L. The results suggest excellent corrosion resistance of the thick and uniform passive barrier oxide film formed by anodization, which can be used to predict corrosion behavior in various environments.</p> Graphical abstract <p></p>

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Optimization of the barrier oxide layer to enhance long-term corrosion resistance of SUS 316L stainless steel in 3.5 wt% NaCl solution

  • 期刊论文

  • 发表日期：

    2025年5月14日

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  • Yeji Choi,
  • Jisoo Kim,
  • Chanyoung Jeong

摘要

The effect of the barrier oxide film as a passivation layer grown by anodizing on the corrosion resistance of stainless steel after immersion in a 3.5 wt% NaCl solution for 200 days was investigated. Before immersion testing, SUS 316L alloy was anodized using an ethylene glycol solution containing NH4F and H2O. The anodized SUS 316L at 70 V exhibited a higher corrosion potential and pitting potential, a lower corrosion current density, and a corrosion inhibition efficiency of 72.24% compared to untreated SUS 316L. After immersion testing, the surface-to-corrosion depth increased by 3.6 times for untreated SUS 316L and by 2.1 times for anodized SUS 316L at 70 V. Additionally, anodized SUS 316L at 70 V exhibits a lower corrosion current density and less weight loss than untreated SUS 316L. The results suggest excellent corrosion resistance of the thick and uniform passive barrier oxide film formed by anodization, which can be used to predict corrosion behavior in various environments.

Graphical abstract