Grain Boundary Engineering in Electrodeposited Tin-Carbon Nanotube Composite Coatings for Enhanced Corrosion Resistance Performance

Dammu, S and Singh, AP and Lala, SRF and Srivastava, C (2023) Grain Boundary Engineering in Electrodeposited Tin-Carbon Nanotube Composite Coatings for Enhanced Corrosion Resistance Performance. In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science .

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Abstract

This research was conducted to explore the potential of incorporating carbon nanotubes (CNTs) into metallic tin (Sn) to enhance its corrosion-resistant property. Specific objective was to study the correlation between coating morphology, micro-texture, and corrosion behavior of Sn-CNT composite coatings. The study showed existence of an optimum CNT concentration that yields high corrosion resistance. The composite coatings were formed over steel substrate by electrodeposition from a sulfate electrolyte bath. Tafel Polarization and electrochemical impedance spectroscopy analyses were conducted to assess the corrosion rates of the coatings. X-ray photoelectron spectroscopy (XPS) was utilized to characterize the nature and fraction of oxides present on the coating surface. Additionally, electron backscatter diffraction (EBSD) studies were performed to evaluate the surface texture and grain boundary constitution of the electrodeposited coatings. It was observed that lower CNT content resulted in finer coating morphology, while higher CNT volume fractions led to non-homogenous and coarser morphologies. The corrosion rate of the Sn-CNT composite coatings was highly sensititve to the CNT content. An optimum CNT concentration demonstrated higher corrosion resistance, with a significant 94 pct decrease in the corrosion current (i corr) compared to the pristine Sn coating. However, increasing the CNT content beyond the optimum level resulted in a decline in corrosion resistance, eventually becoming inferior to the pristine Sn coating. The incorporation of an optimum amount of CNTs into the Sn coating matrix enhanced the fraction of coincidence site lattices (CSLs) in the grain boundary structure. The study highlights the potential of CNT-Sn composites for corrosion-resistant materials and emphasizes the importance of controlling the CNT content to achieve optimal corrosion protection. These findings contribute to the understanding of how carbon nanotubes can be utilized to enhance the performance of metal matrix composites as corrosion-resistant materials.

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 the Springer.
Keywords:	Carbon nanotubes; Composite coatings; Corrosion rate; Corrosion resistant coatings; Corrosive effects; Crystal lattices; Electrochemical corrosion; Electrochemical impedance spectroscopy; Electrodeposition; Electrodes; Electrolytes; Grain boundaries; Metallic matrix composites; Morphology; Sulfur compounds; Textures; Tin; Titanium nitride; X ray photoelectron spectroscopy, Carbon nanotubes composites; Coating morphology; Composites coating; Corrosion resistant properties; Corrosion-resistant materials; Electrodeposited tins; Grain boundary engineering; Metallic tin; Nanotube concentration; Performance, Corrosion resistance
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	04 Aug 2023 09:16
Last Modified:	04 Aug 2023 09:16
URI:	https://eprints.iisc.ac.in/id/eprint/82851

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