Effect of electrodeposition temperature on texture, strain, grain boundary constitution and corrosion behavior of Ni-P coatings with low phosphorous content

Meshram, AP and Gupta, A and Srivastava, C (2022) Effect of electrodeposition temperature on texture, strain, grain boundary constitution and corrosion behavior of Ni-P coatings with low phosphorous content. In: Materialia, 22 .

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Abstract

Nickel-phosphorus (Ni-P) alloy coatings were electrodeposited over mild steel substrate from a constant current DC power source. Effect of deposition bath temperature (15 �C, 20 �C, 25 �C, 35 �C) on the coating corrosion behavior in 3.5 wt. NaCl solution was investigated. Corrosion analysis was conducted using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques. The 15 �C coating showed lowest polarization resistance (Rp = 2818.52 Ω.cm2) value indicating degraded corrosion resistance, whereas the 25 �C coating showed highest polarization resistance (Rp = 6992.285 Ω.cm2) value implying highest corrosion resistance performance amongst all coatings. This was also confirmed by the potentiodynamic polarization measurement where the 15 °C coatings and 25 °C coating showed respectively the highest and lowest corrosion current density (Icorr) values. Icorr values of 15 °C and 25 °C coating was 7.79 μA.cm�2 and 1.534 μA.cm�2, respectively. Analysis of the coating texture, strain and grain boundary constitution by the electron back scatter diffraction (EBSD) technique showed that the predominance of (101) high energy texture, lower fraction of low angle grain boundaries (LAGBs), and higher coating strain yielded high vulnerability to the corrosive attack for 15 �C coating, while (001) low energy growth texture with a relatively higher fraction of LAGBs and lower coating strain led to improved corrosion resistance in 25 °C coating. © 2022 Acta Materialia Inc.

Item Type:	Journal Article
Publication:	Materialia
Publisher:	Elsevier B.V.
Additional Information:	The copyright for this article belongs to author
Keywords:	Corrosion resistance; Corrosion resistant coatings; Corrosive effects; Electrochemical corrosion; Electrochemical impedance spectroscopy; Electrodeposition; Electrodes; Nickel alloys; Nickel coatings; Polarization; Sodium chloride; Steel corrosion; Textures, Corrosion behaviour; Electrodeposition temperature; Grain boundary constitution; Grain-boundaries; Low angle grain boundaries; Mild steel substrates; Nickel phosphorus; Nickel-phosphorus alloy coating; Nickel-phosphorus coating; Polarization resistances, Grain boundaries
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	17 May 2022 06:17
Last Modified:	17 May 2022 06:17
URI:	https://eprints.iisc.ac.in/id/eprint/71753

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