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<p>Magnesium alloys, with their superior strength-to-weight ratio compared to aluminum, are ideal for lightweight applications. This study investigates the effects of Ni-20%Cr and Cr<sub>3</sub>C<sub>2</sub>-25% (Ni-20%Cr) coatings on ZK60 magnesium alloy substrates, focusing on mechanical and corrosion behaviors using the detonation-gun thermal spray process. Chemical reactions between Cr<sub>3</sub>C<sub>2,</sub> NiCr, and detonation products resulted in multiphase composite coatings. SEM and EDS analyses revealed the coatings' surface topography and elemental composition. The feedstock powders' composition significantly influenced the coatings' microstructure, thickness, wear, and corrosion resistance. The hardness of the Ni-20%Cr and Cr<sub>3</sub>C<sub>2</sub>-25% (Ni-20%Cr) coatings was higher than that of the ZK60 substrate, measuring 778HV and 1016HV, respectively. The Cr<sub>3</sub>C<sub>2</sub>-25% (Ni-20%Cr) coating revealed higher tensile strength and wear resistance. The coatings greatly reduced the corrosion rate of the ZK60 magnesium alloy compared to the uncoated specimens.</p>

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Enhancement of Mechanical and Corrosion Behavior in ZK60 Magnesium Alloy via Ni-20%Cr and Cr3C2-25% (Ni-20%Cr) Coatings Applied through Detonation-Gun Thermal Spray

  • 期刊论文

  • 发表日期：

    2025年1月2日

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  • K. Sankar,
  • G. Padmanaban

摘要

Magnesium alloys, with their superior strength-to-weight ratio compared to aluminum, are ideal for lightweight applications. This study investigates the effects of Ni-20%Cr and Cr3C2-25% (Ni-20%Cr) coatings on ZK60 magnesium alloy substrates, focusing on mechanical and corrosion behaviors using the detonation-gun thermal spray process. Chemical reactions between Cr3C2, NiCr, and detonation products resulted in multiphase composite coatings. SEM and EDS analyses revealed the coatings' surface topography and elemental composition. The feedstock powders' composition significantly influenced the coatings' microstructure, thickness, wear, and corrosion resistance. The hardness of the Ni-20%Cr and Cr3C2-25% (Ni-20%Cr) coatings was higher than that of the ZK60 substrate, measuring 778HV and 1016HV, respectively. The Cr3C2-25% (Ni-20%Cr) coating revealed higher tensile strength and wear resistance. The coatings greatly reduced the corrosion rate of the ZK60 magnesium alloy compared to the uncoated specimens.