Microstructure, electrochemical behaviour and bio-fouling of electrodeposited nickel matrix-silver nanoparticles composite coatings on copper

Raghupathy, Y and Natarajan, K A and Srivastava, Chandan (2017) Microstructure, electrochemical behaviour and bio-fouling of electrodeposited nickel matrix-silver nanoparticles composite coatings on copper. In: SURFACE & COATINGS TECHNOLOGY, 328 . pp. 266-275.

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Abstract

Bio-fouling is a major cause of accelerated corrosion and premature failure of materials used in industry. This study presents synthesis, characterisation, bio-fouling, and electrochemical corrosion behaviour of Ni matrix-Ag nanoparticles based composite coatings for anti-corrosive and anti-fouling applications in sea water or marine environment. Two NiAg composite coatings of compositions, Ni-025 at.% Ag and Ni-0.75 at.% Ag, were electrodeposited on copper by dispersing controlled amounts of chemically synthesised Ag nanoparticles into Ni++ bath. Effect of Ag nanopartides on electrochemical corrosion, Ni passivation and bio-fouling of these composite coatings is highlighted. Incorporation of Ag nanoparticles into Ni matrix was found to influence texture, Ni crystallite size, and strain of the Ni-Ag composite coatings. Between pure Ni and two Ni-Ag composite coatings, Ni-0.25 at.% Ag coatings exhibited the highest corrosion resistance in 3.5% NaCI owing to a synergetic combination of relatively large, strain-free Ni crystals with a pronounced texture along 111] direction. During anodic polarisation in 3.5% NaCI, Ag nanoparticles embedded into Ni matrix induced galvanic passivation of Ni phase, which improved tendency of the composite coatings for passivation. Upon exposure to sulphate reducing bacteria, these composite coatings showed greater resistance to formation of biofilm, which confirmed their anti-fouling properties. Extent of bio-film decreased with amount of incorporated Ag nanoparticles in these composite coatings. Bio-film led to a reduction in corrosion resistance of the coatings. This reduction in corrosion resistance due to bio-film decreased with increasing Ag content of the coatings. It can be concluded that anti-microbial nanoparticles embedded in a suitable metal matrix can open up new avenues in addressing biofouling and microbially induced corrosion in sea water. (C) 2017 Published by Elsevier B.V.

Item Type:	Journal Article
Publication:	SURFACE & COATINGS TECHNOLOGY
Additional Information:	Copy right for this article belongs to the ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	17 Nov 2017 05:36
Last Modified:	17 Nov 2017 05:36
URI:	http://eprints.iisc.ac.in/id/eprint/58250

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