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Electroless plating: a versatile technique to deposit coatings on electrical steel

Goel, Vishu, Anderson, Philip, Hall, Jeremy Peter, Robinson, Fiona and Bohm, Siva 2016. Electroless plating: a versatile technique to deposit coatings on electrical steel. IEEE Transactions on Magnetics 52 (5) , 2001004. 10.1109/TMAG.2016.2514745

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Abstract

Coatings on grain-oriented electrical steel (GOES) are produced primarily by roller coating deposition of aluminium ortho phosphate on top of forsterite. These coatings provide the insulation resistance and stress to improve magnetic properties. Electroless deposition of nickel and cobalt based coatings could be used as an alternative because these coatings can be made insulated and stress can be generated and tailored in these coatings. The rate of deposition in electroless plating is faster when compared to other chemical coating techniques and the process is auto catalytic (no external current required). The coatings are corrosion resistant and the magnetic properties of the coatings can be varied by simply changing the pH of the solution. Addition of alloying elements like phosphorus and boron can manipulate the stress generated in the coating from tensile to compressive and vice versa. A 2.15 ± 0.15 μm thick Co-Ni-P coating on GOES was able to reduce the power loss by 9-11 %. Similarly a 414 ± 40 nm thick coating of Co-P-Carbon Nanotube on GOES was able to reduce the power losses ranging 13-15%.The reduction in power loss in Co-Ni-P coated sample was due to tensile stress applied on GOES by the coating which reduced the anomalous loss. The surface roughness was improved for both the Co-Ni-P and Co-P-Carbon Nanotube coating. An improvement in the surface roughness contributed to reduction of hysteresis loss.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Publisher: IEEE
ISSN: 0018-9464
Date of Acceptance: 3 January 2016
Last Modified: 08 Jul 2019 13:27
URI: http://orca.cf.ac.uk/id/eprint/87079

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