Effect of zinc clustering, micro-texture, and surface oxide constituents on the electrochemical corrosion of Sn-Zn coatings electrodeposited at different current densities

Singh, AP and Srivastava, C (2024) Effect of zinc clustering, micro-texture, and surface oxide constituents on the electrochemical corrosion of Sn-Zn coatings electrodeposited at different current densities. In: Journal of Materials Science .

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Abstract

The Sn-23 wt Zn coatings were electrodeposited onto mild steel substrate at different current densities (7, 12, 17, and 22 mA/cm2) from sulfate-based electrolytic bath. The electrochemical degradation corrosion mechanism of the coatings in 3.5 wt NaCl solution were investigated and correlated with evolved grain orientation, grain boundary distribution, solute distribution and corrosion product constituents. The corrosion resistance of the coatings varied non-monotonically with deposition current density. The coating electrodeposited at 12 mA/cm2 offered the highest corrosion resistance (Rp = 10409 Ωcm2) due to its lower energy (100) surface grain orientation, higher fraction of low energy grain boundaries, and relatively inert corrosion product consisting of ZnO and SnO2 compounds. The higher energy (110) surface grain orientation, unstable b-Sn matrix due to embedded Zn-enriched clusters, and weaker corrosion product layer consisting of Zn0 led to the lowest corrosion resistance (Rp = 3429 Ωcm2) for coating electrodeposited at 17 mA/cm2. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2024.

Item Type:	Journal Article
Publication:	Journal of Materials Science
Publisher:	Springer
Additional Information:	The copyright for this article belongs to the publishers.
Keywords:	Atmospheric corrosion; Coated wire electrodes; Corrosion resistance; Corrosion resistant coatings; Corrosive effects; Electrodeposition; Hard facing; Low carbon steel; Steel corrosion; Tin alloys; Tin compounds; Zinc alloys; Zinc coatings; Zinc compounds, 'current; Clusterings; Corrosion products; Effect of zincs; Electrochemicals; Grain orientation; Micro surfaces; Micro-texture; Mild steel substrates; Surface oxide, Electrochemical corrosion
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	27 Nov 2024 10:56
Last Modified:	27 Nov 2024 10:56
URI:	http://eprints.iisc.ac.in/id/eprint/86993

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