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Steel is one of the most substantial alloys used in various industrial applications. This chapter discusses recent advancements in the plasma electrolytic oxidation (PEO) treatment of steel substrates. PEO coating preparation on steel surfaces can be categorized into three methods based on their growth mechanisms: (1) pre-coating the steel with an aluminum layer before PEO, resulting in a coating similar to those formed on aluminum alloys; (2) using specific concentrations of silicate and aluminate electrolytes to form coatings composed mainly of oxide compounds such as SiO2 or Al2O3; and (3) employing cathodic PEO technology to grow protective coatings primarily consisting of compact iron oxides. These methods effectively improve the wear and corrosion resistance of steel by enhancing surface microhardness, coating compactness, and thickness.

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Advances in Anticorrosion and Anti-Wear Plasma Electrolytic Oxidation Coatings for Steel

  • 章节

  • 发表日期：

    2025年

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  • Lujun Zhu,
  • Manling Sui

摘要

Steel is one of the most substantial alloys used in various industrial applications. This chapter discusses recent advancements in the plasma electrolytic oxidation (PEO) treatment of steel substrates. PEO coating preparation on steel surfaces can be categorized into three methods based on their growth mechanisms: (1) pre-coating the steel with an aluminum layer before PEO, resulting in a coating similar to those formed on aluminum alloys; (2) using specific concentrations of silicate and aluminate electrolytes to form coatings composed mainly of oxide compounds such as SiO2 or Al2O3; and (3) employing cathodic PEO technology to grow protective coatings primarily consisting of compact iron oxides. These methods effectively improve the wear and corrosion resistance of steel by enhancing surface microhardness, coating compactness, and thickness.