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Enhancement in Anti-Corrosive Behavior of Ni-P Coatings by Incorporation of Carbon Nanotubes

Meshram, AP and Kumar, MKP and Srivastava, C (2021) Enhancement in Anti-Corrosive Behavior of Ni-P Coatings by Incorporation of Carbon Nanotubes. In: Journal of Materials Engineering and Performance, 31 (2). pp. 1573-1584.

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Official URL: https://doi.org/10.1007/s11665-021-06260-8


Ni-P-carbon nanotube (CNT) coatings were electrodeposited over mild steel using electrolyte bath containing different CNT concentrations (2.5, 5, 10, 15 mgl−1). Ni-P-CNT coatings exhibited improved corrosion resistance when compared to the pristine Ni-P coating. The corrosion behavior of the samples at different exposure times (1, 24, 48, 72 h) was analyzed using potentiodynamic polarization and electrochemical impedance spectroscopy techniques. After 1h immersion in the corrosive media, highest charge transfer resistance with lowest corrosion current density value was observed for the coating obtained from electrolyte with 5 mgl−1 CNT concentration when compared to other coatings. This coating showed the highest corrosion resistance primarily due to lesser morphological defects. The non-uniform distribution of agglomerated CNTs in Ni-P-CNT coatings from electrolytes with lower (0 and 2.5 mgl−1) and higher CNT concentration (10, 15 mg l−1) caused surface defects and degraded corrosion resistance. For higher exposure times, the coating produced from the electrolyte containing 10 mgl−1 CNT concentration exhibited the highest corrosion resistance property. It was shown that an optimization of CNT dispersion in the electroplating bath is required to achieve highest anti-corrosive property and this optimum requirement varies with the change in the exposure time of the coating to the corrosive media.

Item Type: Journal Article
Publication: Journal of Materials Engineering and Performance
Publisher: Springer
Additional Information: The copyright for this article belongs to the ASM International, Springer.
Keywords: Charge transfer; Corrosion resistance; Corrosion resistant coatings; Corrosive effects; Electrochemical corrosion; Electrochemical impedance spectroscopy; Electrodeposition; Electrodes; Electrolytes; Surface defects, Amorphous coating; Anti-corrosive; Carbon nanotube coatings; Corrosive media; Electrolyte bath; Exposure-time; Nanotube concentration; Ni-P coating; Ni-P electrodeposition; Ni-P-carbon nanotube, Carbon nanotubes
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 01 Jul 2022 06:17
Last Modified: 01 Jul 2022 06:17
URI: https://eprints.iisc.ac.in/id/eprint/74037

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