Production and structure electrolytic obtained composite layers containing vanadium in Ni-Mo alloy matrix
Jolanta Niedbała, Joanna Panek, Antoni Budnik, Eugeniusz Łągiewka Uniwersytet Śląski, Instytut Fizyki i Chemii Metali, ul. Bankowa 12, 40-007 Katowice
Annals 4 No. 9, 2004 pages 83-87
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abstract The composite layers on a base of Ni-Mo alloy containing vanadium were obtained by electrodeposition from the citrate bath containing nickel and molybdenum ions and a suspension of vanadium powder. The process was carried out under galvanostatic conditions. Comparative tests were conducted on Ni-Mo alloys obtained under the same conditions from the citrate solution without V powder as well as on the Ni+V composite layers. Surface morphology of obtained materials was determined by stereoscopic microscopy. The chemical composition was determined using X-ray fluorescence spectroscopy method. It was stated that Ni-Mo+V composite layers deposited in the range of j = 100÷300 mA/cm2 contain from 6 to 36% of V and from 16 to 20% of Mo. Structural investigations were conducted by X-ray diffraction method. The phase composition of Ni-Mo+V and Ni+V composite layers as well as Ni-Mo alloys was determined. It was ascertained that electrodeposited Ni-Mo alloys are characterized by nanocrystalline strucure whereas Ni-Mo+V composite layers have an crystalline V phase built into the nanocrystalline Ni-Mo matrix. Ni+V composite layers consist in crystalline phases of nickel and vanadium. Key words: composite coatings, vanadium, alloys matrix