Abstract
The present investigation is a study into the scratch and corrosion response of as-coated Ni-B-TiO2 as compared to the as-deposited Ni-B coatings. Ultrasonicated nano TiO2 particles were used to reinforce electroless Ni-B coatings. The presence of hard nano TiO2 particles improved the scratch hardness of the Nickel-Boron-TiO2 coatings. During the scratch test for an applied load of 20 N, the Nickel-Boron-TiO2 coating showed a decrease of 42 % in scratch width as compared to the Ni-B coatings. Corrosion behavior also showed remarkable improvement with the addition of nanoparticles. As compared to the Nickel-Boron coatings, the corrosion potential Ecorr improved by 5 % while the corrosion current density Icorr showed a 1.5-fold decrease for Ni-B- TiO2 coatings. The double-layer capacitance Cdl which is a qualitative indicator of the porosities present in the coatings was nearly halved with the addition of TiO2 nanoparticles. The specimen underwent SEM analysis for the morphological study and scratch testing to determine the scratch hardness and corrosion behaviour to identify the electrochemical response to a corrosive environment.
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