Electrodeposition and Mechanical Properties of Niframe0Wframe1B Composites from Tartrate Bath |
18.03.2010 г. |
Electrodeposition and Mechanical Properties of NiWB Composites from Tartrate Bath1 M. G. Hosseinia, M. Abdolmalekib, and S. A. Seyed Sadjadib aElectrochemistry Research Laboratory, Department of Physical Chemistry, Chemistry Faculty, University of Tabriz, Iran bDepartment of Chemistry, IUST University, Tehran, Iran e-mail:
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Received October 29, 2007 Abstract — Electrodeposition of Ni–W–B alloys from plating baths containing tartrate in the absence of ammonia is studied. Detailed studies on the effects of bath temperature, pH, cathode current density and plating time have led to optimum operational conditions for obtaining satisfactory alloy deposits. The operational conditions for deposition the alloy with high hardness are; current density 30 mA cm–2, pH 6.0 and bath temperature of 60C. The results have shown that the adherence of Ni–W–B is better than the Ni and Chromium on Cu substrate. It adheres to Cu substrates better than electrodeposited Ni and chromium. The morphology of the depos-its was studied by SEM and the analysis of composition performed by EDX and inductively coupled plasma (ICP). The as-deposited alloy contained 21.66 wt % W and the highest cathode current efficiency for deposition of the alloy was about 38%. The deposit obtained under these conditions had an amorphous character with a hardness of about 800 HV, which is comparable to the hardness of chromium, occurred at a heat treatment temperature of 400C. When heat treated up to this temperature, the initial metastable structure decomposed into fine particles of Ni4W in a nickel solid solution. DOI: 10.1134/S207020511001017X
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