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Print version ISSN 0100-4670On-line version ISSN 1678-4618
SANTANA, R. A. C. de; PRASAD, S. and SANTANA, F. S. M. de. Electrolytic coating with corrosion and wear resistant Ni-W-B amorphous alloy. Eclet. Quím. [online]. 2003, vol.28, n.1, pp.69-76. ISSN 0100-4670. http://dx.doi.org/10.1590/S0100-46702003000100009.
The process of electrodeposition of amorphous layer of Ni-W-B alloy on a cathode, using a bath containing 0.0185 M nickel sulfate, 0.0155 M sodium tungstate, 0.0364 M sodium citrate, 0.017 g/L 1-dodecylsulfate-Na and ammonia for pH adjustment to 8.5, has been studied. Detailed studies on bath temperature, bath agitation and cathode current density led to the optimum conditions for obtaining satisfactory alloy deposit. The alloy presented higher corrosion and wear resistance in comparison to the hard chromium, besides its amorphous characteristic verified by X-ray diffraction. These alloys should have great importance in various applications in chemical, petroleum, petrochemical, naval, automobile and civil construction industries due to their special characteristics such as high wear and corrosion resistance and the capacity to maintain their mechanical properties at high temperatures.
Keywords : Ni-W-B alloys; electrodeposition; corrosion; amorphous alloys; wear.