Национальный технический университет "Харьковский политехнический институт"
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A method for electroplating of nickel-copper coating on NdFeB magnets relates to the galvanostegy. According to the invention the nickel-copper coating is sedimented in the form of a multilayer coating (Cu-Ni)/(Ni-Cu) of electrolyte, comprising nickel and copper ions in the ratio of [Ni]:[Cu]=2÷10, and phosphorus compounds and ammonia ions in the form of ammonium pyrophosphate, ammonium chloride, ammonium hydroxide to pH 8.2-8.7, at the periodical changing the current density on an underlayer, which is coated in the solution of the catching bath of this electrolyte at solution pH 9.0-9.5 and concentration [Cu] less than 1 g/dm, and [Ni] more than 3 g/dm. The invention reduces the number of operations, allows to lower water, materials and energy consumption.
UAA200912231A2009-11-272009-11-27METHOD For electroplating of nickel-COPPER COATING ON MAGNET NdFeB
UA92430C2
(en)