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

• Main Authors: Jegan Annamalai, Venkatesan Rajamanickam, Arunachalam Ramanathan
• Format: Article
• Language: English
• Published: De Gruyter 2014-06-01
• Series: Science and Engineering of Composite Materials
• Subjects: corrosion resistance; mechanical properties; ni-nano-al2o3 composite coatings; optimization; pulse electrodeposition
• Online Access: https://doi.org/10.1515/secm-2013-0071

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.