Mechanical properties of Ni-nano-Al2O3 composite coatings on AISI 304 stainless steel by pulsed electrodeposition

Annamalai Jegan, Rajamanickam Venkatesan, Ramanathan Arunachalam

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Abstract

This article primarily focuses on investigating the feasibility of enhancing the mechanical properties of Al2O3 coatings on AISI 304 stainless steel specimen. Taguchi's L27 orthogonal array was used to optimize the microhardness of Ni-nano-Al2O3 composite coatings over AISI 304 stainless steel specimen by pulsed electrodeposition method. Pulse frequency 10 Hz, duty cycle 20%, and peak current density 0.6 A/cm2 are found to be optimal values. Moreover, the influences of the optimized pulse parameters over the microstructure, energy-dispersive X-ray spectroscopy (EDX), corrosion resistance, X-ray diffraction (XRD), and coating thickness of Ni-nano-Al2O3 composite coatings were also investigated. The microhardness, microstructure, and texture of the composite coatings were significantly influenced by pulse frequency. The EDX results confirmed that the composites were fairly dispersed over the specimen. The hardness as well the corrosion resistance of the specimen was greatly improved.

Original languageEnglish
Pages (from-to)351-358
Number of pages8
JournalScience and Engineering of Composite Materials
Volume21
Issue number3
DOIs
Publication statusPublished - Jun 1 2014

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Keywords

  • Corrosion resistance
  • Mechanical properties
  • Ni-nano-AlO composite coatings
  • Optimization
  • Pulse electrodeposition

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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