Study of pulse electrodeposition parameters for nano YSZ-Ni coatings and its effect on tribological and corrosion charac
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ORIGINAL ARTICLE
Study of pulse electrodeposition parameters for nano YSZ‑Ni coatings and its effect on tribological and corrosion characteristics Rajeev Nayan Gupta1 Received: 29 July 2020 / Accepted: 25 September 2020 © King Abdulaziz City for Science and Technology 2020
Abstract In the present work, the surface properties of EN8 steel with/without pulse electrodeposition have been investigated. The co-deposition of nano-sized Yttria Stabilized Zirconia (YSZ; ≈ 80 nm average diameter) has been done using additive—free nickel solution by applying the pulse current. The deposition of YSZ-Ni metal matrix composite (MMC) was obtained by varying the duty cycle (D.C.; i.e. 30 and 50%) and maintaining a constant frequency of 10 Hz. The current density also varied between 0.02 and 0.06 A/cm2 and optimized on the basis of improvement of surface characteristics and defect-free deposits. Penetration strength of the composite coated surface has been investigated with the nanoindentation test. A significant difference in the surface hardness was observed by varying the duty cycles and current densities. Corrosion test has been performed to estimate the corrosion rate of the coated surfaces. And, it observed approximately one-fourth times reduction in corrosion rate for MMC electrocoating at the optimum condition as compared to the base substrate. In addition, the adherence quality and antiwear performance of different coated substrates evaluated with reciprocating test rig. A substantial improvement in antiwear performance for composite coatings has been reported. Different analytical tools have been used to characterize the composite surfaces. Also, the effects of various process controlling parameters and corresponding analysis have been reported. Keywords Electrodeposition · Duty cycle · Nanoindentation · Corrosion rate · Metal matrix composite · Tribology
Introduction Electrodeposition is an electrochemical technique to produce metallic and composite coatings at the interface between the conductive electrode and electrolyte. Coating quality obtained by the electrodeposition process is mainly controlled by current density, potential, type of electrode surface, pH of electrolyte, bath temperature and deposition rates etc. (Ibañez and Fatás 2005). In recent years, efforts have been made to synthesize the nanomaterials due to their improved properties when compared to the conventional coarse-grained polycrystalline materials. Nanocomposite materials have various special properties such as dispersion hardening, self-lubrication, wear and corrosion resistance, oxidation resistance at elevated temperatures, reduced modulus of elasticity and enhanced hardness (Musil 2012; Prajapati et al. 2018). It is reported that reduction in the grain size to nano-meters, improves the hardness * Rajeev Nayan Gupta [email protected] 1
National Institute of Technology, Silchar, Assam 788010, India
of composite coatings substantially (Aruna and Ranjan 2003). The unique mechanical properties of Zirconia (ZrO2) ceramics has led to th
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