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<p>Stainless steels are basic corrosion-resistant materials, but despite great efforts for over a century, they still suffer inevitably from environmental erosions by ubiquitous chemical reactions, resulting in typical corrosion rates at dozens of μm∙yr<sup>-1</sup>. Here, we developed a strong-field laser passivation strategy to obtain super corrosion-resistant stainless steels through forming a hybrid µm-Fe<sub>3</sub>O<sub>4</sub>/Fe<sub>2</sub>O<sub>3</sub>/Cr<sub>2</sub>O<sub>3</sub> passivation layer with unique bionic taro-leaf-like hierarchically heterogeneous Cassie-state micro/nanostructure morphologies. We observed up to 100,000-fold reduction in the corrosion rate of AISI 304 steel in saline, acidic as well as alkaline solutions. The ultralow corrosion rate can remain for &gt;6500 hours. The generality was exemplified by exhibiting extreme anticorrosion enhancements of AISI 316, 420, 201, 430, and 2205 steels under the same conditions. This study reveals a new strategy for achieving super corrosion-resistant performance of stainless steels in various harsh environments.</p>

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Significant reduction of corrosion of stainless steel by strong-field laser surface passivation

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年10月5日

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  • Liansheng Zheng,
  • Hongwei Zang,
  • Yuan Liu,
  • Yukun Xiao,
  • Yingbo Cong,
  • Zhen Cheng,
  • Ganwen Chen,
  • Zhenxiang Xing,
  • Jisheng Pan,
  • Qing Jiang,
  • Wei Chen,
  • Kaoru Yamanouchi,
  • Huailiang Xu,
  • Ruxin Li

摘要

Stainless steels are basic corrosion-resistant materials, but despite great efforts for over a century, they still suffer inevitably from environmental erosions by ubiquitous chemical reactions, resulting in typical corrosion rates at dozens of μm∙yr-1. Here, we developed a strong-field laser passivation strategy to obtain super corrosion-resistant stainless steels through forming a hybrid µm-Fe3O4/Fe2O3/Cr2O3 passivation layer with unique bionic taro-leaf-like hierarchically heterogeneous Cassie-state micro/nanostructure morphologies. We observed up to 100,000-fold reduction in the corrosion rate of AISI 304 steel in saline, acidic as well as alkaline solutions. The ultralow corrosion rate can remain for >6500 hours. The generality was exemplified by exhibiting extreme anticorrosion enhancements of AISI 316, 420, 201, 430, and 2205 steels under the same conditions. This study reveals a new strategy for achieving super corrosion-resistant performance of stainless steels in various harsh environments.