Friction and Wear Properties of T6 Treatment And As-Plated Duplex NiP/NiB Coatings on Az91d Magnesium Alloy

Authors : Kübra UÇAR, Uğur ŞEN
Pages : 31-42
Doi:10.31202/ecjse.450204
View : 25 | Download : 8
Publication Date : 2019-01-31
Article Type : Other Papers
Abstract :Electroless nickel coatings can be    preferred in wear resistant applications like firearms with good lubricity properties. In this study, a widely-used magnesium alloy, AZ91D both as-cast and precipitation-hardened conditions were coated with nickel phosphorus/nickel boron duplex coatings by the electroless deposition method. Solution treatment insert ignore into journalissuearticles values(W); of the alloy was carried out at 415 °C for 22 h in carbon powder followed by water quenched at 25 °C. Aging treatment insert ignore into journalissuearticles values(T6); of the solution-treated samples was performed at 216 °C for 6 h. The microstructures, elemental distributions and phase analysis of the obtained coatings were characterized by scanning electron microscopy insert ignore into journalissuearticles values(SEM);, energy dispersive X-ray spectrometry insert ignore into journalissuearticles values(EDS); and X-ray diffraction insert ignore into journalissuearticles values(XRD); analysis. According to the XRD analysis, the obtained coatings have an amorphous character and subsequent to this, a crystallization process to the sample is carried out at 350 °C. The friction and wear properties of the coating are studied by means of ball-on-disc experiments at room temperature under 10N applied loads at 0.1 m/s sliding speed using alumina balls as counterparts. The friction coefficient of the sample was compared with each other from friction coefficient-distance graphics. The wear rates were determined by measuring the depth of the track with an 3D-optical microscope insert ignore into journalissuearticles values(3D-OM);. Characterization of the wear tracks was performed by SEM and EDS.
Keywords : Electroless nickel coatings, Wear, AZ91D

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