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Enhancement in the corrosion resistance behaviour of amorphous Ni�P coatings by incorporation of graphene

Meshram, A P and Punith Kumar, M K and Srivastava, C (2020) Enhancement in the corrosion resistance behaviour of amorphous Ni�P coatings by incorporation of graphene. In: Diamond and Related Materials, 105 .

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Official URL: https://dx.doi.org/10.1016/j.diamond.2020.107795


In the current study, amorphous nickel�phosphorus�graphene (Ni�P�G) composite coatings were electroplated on mild steel substrate. Coatings were electroplated from nickel sulphate bath containing phosphorus acid and exfoliated graphene in amounts of 50 mg/l, 100 mg/l, 150 mg/l, and 200 mg/l. Phase constitution, composition, surface morphology and corrosion parameters were investigated as a function of the graphene content. Experimental results exhibited that Ni�P and Ni�P�G composite coatings possessed improved corrosion resistance than the mild steel substrate and addition of graphene enhanced the corrosion resistance performance when compared to the pristine coating. It was observed that an optimum exists with respect to the amount of graphene dispersed in the electrolyte bath for achieving high anti-corrosion property from the coating produced using the respective plating bath. Lower amount of graphene in dispersion produced uniform surface morphology which acted along with the graphene impermeability to yield high corrosion resistance performance. Higher quantity of graphene in dispersion, on the other hand, caused their agglomeration thus producing rough and defective surface morphology which along with non-uniform distribution of graphene yielded higher corrosion rates. © 2020 Elsevier B.V.

Item Type: Journal Article
Publication: Diamond and Related Materials
Publisher: Elsevier
Additional Information: The copyright to this article belongs to Elsevier
Keywords: Composite coatings; Corrosion; Corrosion rate; Corrosion resistance; Dispersions; Electrolytes; Graphene; Low carbon steel; Morphology; Nickel coatings; Nickel sulfates; Nickel-Phosphorus; Phosphorus; Steel corrosion; Sulfur compounds; Surface morphology, Amorphous coating; Anti-corrosion property; Corrosion parameters; Exfoliated graphene; Mild steel substrates; Nickel Sulphate bath; Non-uniform distribution; Phase constitution, Corrosion resistant coatings
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 31 Aug 2020 11:23
Last Modified: 31 Aug 2020 11:23
URI: http://eprints.iisc.ac.in/id/eprint/64854

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