Electrodeposition of Nickel-Chromium Alloys from Fluoborates

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Abstract
It is shown that good quality nickel-chromium alloys containing up to 30% chromium can be obtained from an electrolyte consisting of nickel and chromium fluoborates. Fairly high cathode efficiencies are obtained which drop with time of deposition. The effects of bath metal ratio, current density and temperature on the composition of the deposits are examined. It is shown that the deposition follows some of the trends of induced codeposition and the results are discussed in terms of this concept. It is shown that microcracking appears in some of the alloys. Cathode potential current data are obtained to illustrate further the induced deposition concept. Fluoborates may offer a system which gives nickel rich alloys and could form the basis of a possible future commercial process.

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