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Brazilian Journal of Chemical Engineering

Print version ISSN 0104-6632On-line version ISSN 1678-4383

Abstract

PRASAD, S.; MARINHO, F.A.  and  SANTANA, F.S.M.. Control and optimization of baths for electrodeposition of Co-Mo-B amorphous alloys. Braz. J. Chem. Eng. [online]. 2000, vol.17, n.4-7, pp.423-432. ISSN 0104-6632.  http://dx.doi.org/10.1590/S0104-66322000000400007.

Optimization and control of an electrodeposition process for depositing boron-containing amorphous metallic layer of cobalt-molybdenum alloy onto a cathode from an electrolytic bath having cobalt sulfate, sodium molybdate, boron phosphate, sodium citrate, 1-dodecylsulfate-Na, ammonium sulfate and ammonia or sulfuric acid for pH adjustments has been studied. Detailed studies on bath composition, pH, temperature, mechanical agitation and cathode current density have led to optimum conditions for obtaining satisfactory alloy deposits. These alloys were found to have interesting properties such as high hardness, corrosion resistance, wear resistance and also sufficient ductility. A voltammetric method for automatic monitoring and control of the process has been proposed.

Keywords : Electrodeposition; electrolytic baths; cobalt-molybdenum amorphous alloys.

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