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<p>The durability and corrosion resistance of SS 316L in desalination plants are compromised by the harsh, corrosive environment of seawater. To address this, ceramic coatings like Al<sub>2</sub>O<sub>3</sub> and Cr<sub>2</sub>O<sub>3</sub> are explored for enhancing surface properties. This study evaluates SS316L, Al<sub>2</sub>O<sub>3</sub>, and Cr<sub>2</sub>O<sub>3</sub> coatings using SEM, microhardness testing, and XRD, with EDS. SEM revealed that Al<sub>2</sub>O<sub>3</sub> coatings had cracks and porosity, resulting in lower hardness compared to the irregular but harder Cr<sub>2</sub>O<sub>3</sub>. Microhardness testing confirmed Cr<sub>2</sub>O<sub>3</sub> as the hardest material, followed by Al<sub>2</sub>O<sub>3</sub> and SS316L. XRD identified the crystalline structures and phase compositions of these coatings. Corrosion tests demonstrated Cr<sub>2</sub>O<sub>3</sub>’s superior resistance, attributed to its ability to form a protective Cr<sub>2</sub>O<sub>3</sub> oxide layer, which prevents degradation in aggressive environments. These findings highlight Cr<sub>2</sub>O<sub>3</sub>’s potential for enhancing both hardness and corrosion resistance in desalination applications.</p>

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Metallurgical Characterization of Cr2O3 and Al2O3 Coatings on SS 316L: Implications for Durability in Desalination Environments

  • 期刊论文

  • 发表日期：

    2025年1月24日

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  • Santoshkumar V. Wagh,
  • Suhas G. Jagtap,
  • Mahendra J. Sable,
  • Dhiraj Deshmukh

摘要

The durability and corrosion resistance of SS 316L in desalination plants are compromised by the harsh, corrosive environment of seawater. To address this, ceramic coatings like Al2O3 and Cr2O3 are explored for enhancing surface properties. This study evaluates SS316L, Al2O3, and Cr2O3 coatings using SEM, microhardness testing, and XRD, with EDS. SEM revealed that Al2O3 coatings had cracks and porosity, resulting in lower hardness compared to the irregular but harder Cr2O3. Microhardness testing confirmed Cr2O3 as the hardest material, followed by Al2O3 and SS316L. XRD identified the crystalline structures and phase compositions of these coatings. Corrosion tests demonstrated Cr2O3’s superior resistance, attributed to its ability to form a protective Cr2O3 oxide layer, which prevents degradation in aggressive environments. These findings highlight Cr2O3’s potential for enhancing both hardness and corrosion resistance in desalination applications.