Nickel-Tungsten-Titanium carbide (Ni-W-TiC) coatings were produced by pulse electrodeposition from a Ni-W electrolyte containing TiC particles. The effects of TiC concentration in the electrolyte on the morphology, crystallite size, microstrain, mechanical, tribology and electrochemical properties of TiC reinforced Ni-W co-depositions were investigated. The highest hardness of 8.3 GPa and modulus of elasticity of 207 GPa were observed in the case of the coating produced at 15 g/L TiC concentration in the electrolyte. The increase in the H/E and H 3 / E 2 ratios led to displaying excellent wear resistance of the Ni-W-TiC co-depositions besides high resistance to plastic deformation. A direct correlation was observed between nanoindentation and wear resistance results of reinforced TiC co-depositions. It has also been shown by electrochemical impedance spectroscopy and potentiodynamic polarization analysis that TiC particles can improve the electrochemical properties of the co-depositions because of their barrier effect.
Elektrolitik kaplamalara alternatif oluşturan ve dışarıdan herhangi bir elektrik ihtiyacına gerek duymadan gerçekleşen otokatalitik akımsız kaplamalar birçok endüstriyel alanda kullanılmaktadır. Homojen bir kaplama kalınlığı elde edilmesi, yüksek sertlik, iyi korozyon ve aşınma direncine sahip olması, akımsız kaplamaları oldukça yaygın hale getirmektedir. Ayrıca karmaşık şekilli parçalara da uygulanabilmesi avantajları arasında yer almaktadır. Bu çalışmada akımsız NiP kaplamaların sertlik, metalik nikel ve fosfor içerikleri, ısıl işlem sonrası oluşan bileşik türleri ve mikroyapısal özellikleri incelenerek sodyum hipofosfit, sıcaklık ve zaman parametrelerinin etkileri ortaya konmuştur.
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