Effect of Deposition Temperature on the Evolution of Texture, Grain Boundary Constitution and Corrosion Behaviour of Sn–Cr Coatings

Lala, SRF and Gupta, A and Srivastava, C (2022) Effect of Deposition Temperature on the Evolution of Texture, Grain Boundary Constitution and Corrosion Behaviour of Sn–Cr Coatings. In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science .

PDF met_mat_tra_2022.pdf - Published Version Restricted to Registered users only Download (2MB) | Request a copy

Abstract

Effect of deposition temperature on the evolution of microstructure and corrosion properties of electrodeposited SnCr coatings was studied. The coatings were electrodeposited at three different bath temperatures (15 °C, 30 °C, 45 °C). All the coatings were compact and contained tin and chromium oxide phases. Coating fabricated at lowest temperature (15 °C) exhibited the highest corrosion resistance. The polarization resistance values (Rp) obtained from the electrochemical impedance spectroscopy analysis were 9160, 3672 and 8212 Ω cm2, respectively, for 15 °C, 30 °C and 45 °C coating. Electron backscattered diffraction analysis was conducted to correlate the electrochemical properties of the coatings with coating texture. The preferred texture changed from near (100) orientation to (201) orientation as the electrodeposition temperature varied from 15 °C to 45 °C. Grain boundary constitution of the coatings were sensitive to the deposition temperature. The fraction of low angle grain boundaries (LAGB’s) for the low temperature coating (15 °C) was 59.8 pct, while the fraction of LAGB’s for the coating fabricated at high temperature (45 °C) was 36.0 pct. The higher fraction of LAGB’s and lower energy preferred orientation (100) in case of 15 °C were responsible for its higher corrosion resistance performance.

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; Chromium alloys; Chromium compounds; Corrosion resistant coatings; Corrosive effects; Electrochemical corrosion; Electrochemical impedance spectroscopy; Electrodes; Grain boundaries; Temperature; Textures; Tin oxides, Bath temperatures; Corrosion behaviour; Corrosion property; Cr coatings; Deposition temperatures; Grain-boundaries; Low angle grain boundaries; Lows-temperatures; Microstructures properties; Polarization resistances, Corrosion resistance
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	06 Oct 2022 11:17
Last Modified:	06 Oct 2022 11:17
URI:	https://eprints.iisc.ac.in/id/eprint/77060

Actions (login required)

View Item