Deposition Current Density Induced Alterations in Texture and Grain Boundary Constitution of Electrodeposited Zinc Coatings for Enhanced Corrosion Resistance Performance

Jyotheender, KS and Srivastava, C (2023) Deposition Current Density Induced Alterations in Texture and Grain Boundary Constitution of Electrodeposited Zinc Coatings for Enhanced Corrosion Resistance Performance. In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science .

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Abstract

Zinc coatings were electrodeposited at different current densities, i.e., 30, 40, 50, 60, and 70 mA/cm2. All the coatings exhibited compact and crack-free morphology. The coating electrodeposited at 50 and 30 mA/cm2 current density showed the highest and lowest corrosion resistance, respectively. Corrosion current density (icorr) and polarization resistance (Rp) values for the 50 mA/cm2 deposited coating were 0.995 µA/cm2 and 5268.62 Ω cm2, respectively. icorr and Rp values for 30 mA/cm2 electrodeposited coating were 64.63 µA/cm2 and 627.51 Ω cm2, respectively. Electron backscatter diffraction analysis showed a direct correlation between the coating micro-texture and its corrosion behavior. The high corrosion resistance of coating electrodeposited at 50 mA/cm2 current density was due to the presence of dominant basal plane surface texture and a higher fraction of low-energy grain boundaries. The high corrosion rate of coating deposited at 30 mA/cm2 current density was due to the presence of high energy texture and large angle boundaries, which promoted corrosive media penetration through grains and grain boundaries, resulting in a higher dissolution rate.

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 rate; Corrosion resistance; Corrosion resistant coatings; Corrosive effects; Current density; Electrodeposition; Electrodes; Grain boundaries; Morphology; Textures; Zinc alloys, Corrosion current densities; Crack free; Deposited coatings; Deposition current density; Electrodeposited coatings; Grain-boundaries; P-values; Performance; Polarization resistances; Texture boundary, Zinc coatings
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	18 Apr 2023 10:31
Last Modified:	18 Apr 2023 10:31
URI:	https://eprints.iisc.ac.in/id/eprint/81343

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