Correlation Between Texture, Grain Boundary Constitution, and Corrosion Behavior of Ni-Cu Coatings

Aliyu, A and Gupta, A and Srivastava, C (2022) Correlation Between Texture, Grain Boundary Constitution, and Corrosion Behavior of Ni-Cu Coatings. In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science .

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Abstract

Nickel-Copper (Ni-Cu) coating with different Cu contents (2 to 7 wt pct) was electrodeposited over a mild steel substrate. Corrosion properties of these coatings were studied in 3.5 wt pct NaCl solution by electrochemical impedance spectroscopy (EIS) techniques and weight loss measurements, and the results obtained were correlated with the microstructure of the coatings. The results revealed that the Ni-2wt pct Cu coating yields the best corrosion protection performance when compared to the pure Ni, Ni-4wt pct Cu, and Ni-7wt pct Cu coatings with relatively lower corrosion resistance. Ni-7wt pct Cu coatings exhibited the lowest corrosion resistance performance. The coating morphology micrographs showed that the initial incorporation of Cu (2 wt pct) into the Ni matrix produced a compact, uniform, and crack-free morphology. The coating micro-texture study conducted using the electron backscatter diffraction (EBSD) technique showed an increase in the low-angle grain boundaries (LAGBs) with a relatively higher fraction of Σ3 CSLs (special boundaries) for the Ni-2wt pct Cu coating. LAGBs are low-energy grain boundaries, and thus, a higher fraction of LAGBs leads to increased corrosion resistance. Ni-7wt pct Cu coatings contained the highest percentage of high-angle grain boundaries (HAGBs), which yielded the highest corrosion rate for this coating. © 2022, The Minerals, Metals & Materials Society and ASM International.

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:	Binary alloys; Copper alloys; Copper corrosion; Corrosion rate; Corrosion resistant coatings; Corrosive effects; Electrochemical corrosion; Electrochemical impedance spectroscopy; Grain boundaries; Morphology; Nickel coatings; Sodium chloride; Textures, A: mild steels; Corrosion behaviour; Corrosion property; Cu coatings; Cu content; Electrochemical impedance spectroscopy techniques; Grain-boundaries; Low angle grain boundaries; Mild steel substrates; NaCl solution, Corrosion resistance
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	09 Mar 2022 10:22
Last Modified:	09 Mar 2022 10:22
URI:	http://eprints.iisc.ac.in/id/eprint/71459

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