Engineering Grain Boundary Constitution in Pulse Electrodeposited Nickel Coatings for Enhanced Resistance to Electrochemical Degradation

Banerjee, S and Singh, AP and Lala, SRF and Srivastava, C (2024) Engineering Grain Boundary Constitution in Pulse Electrodeposited Nickel Coatings for Enhanced Resistance to Electrochemical Degradation. In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 55 (8). pp. 2977-2989.

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Abstract

Ni coatings were electrodeposited over mild steel using a pulsed electrodeposition technique at three different duty cycles (30, 60, and 80 pct) with three different frequencies (25, 75, and 150 Hz) corresponding to each duty cycle. The influence of particular duty cycle sets and frequency on the micro-texture and corrosion behavior of coatings was investigated. Potentiodynamic polarization tests revealed the lowest corrosion rate for deposits obtained at 80 pct duty cycle and frequency of 75 Hz. In comparison, the highest corrosion rate was measured for deposits obtained at 80 pct duty cycle and frequency of 150 Hz. A decrease of around 57 pct in corrosion current density between the lowest and the highest corrosion-resistant coatings was observed. Similar trends in corrosion behavior were observed using electrochemical impedance spectroscopy (EIS) results. Electron backscatter diffraction (EBSD) analysis revealed that the pulse deposition parameters did not affect the coating surface texture but significantly altered the grain boundary constitution and coating strain. The lower corrosion rate of coatings obtained at 80 pct duty cycle and 75 Hz frequency was due to a higher fraction of both coincident site lattice boundaries (CSLs) and low-angle grain boundaries (LAGBs) along with lower coating strain. The higher corrosion rate of coatings obtained at 80 pct duty cycle and 150 Hz frequency was due to a higher fraction of high-angle grain boundaries (HAGBs), a lower fraction of CSLs, and higher coating strain. © The Minerals, Metals & Materials Society and ASM International 2024.

Item Type:	Journal Article
Publication:	Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Publisher:	Springer
Additional Information:	The copyright for this article belongs to Springer.
Keywords:	Corrosion resistance; Corrosion resistant coatings; Corrosive effects; Deposits; Electrochemical corrosion; Electrochemical impedance spectroscopy; Electrodeposition; Electrodes; Grain boundaries; Nickel coatings; Textures, Coincident site lattice boundaries; Corrosion behaviour; Different frequency; Duty-cycle; Electrochemical degradation; Electrodeposited Nickel coating; Grain-boundaries; Micro-texture; Ni coating; Pulsed electrodeposition techniques, Corrosion rate
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	21 Aug 2024 12:20
Last Modified:	21 Aug 2024 12:20
URI:	http://eprints.iisc.ac.in/id/eprint/85492

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