Method for carrying out electronickelling on neodymium-iron-boron magnet
A technology of NdFeB and nickel electroplating, which is applied in the field of NdFeB magnet electroplating nickel, can solve the problems of NdFeB magnets, such as a large drop in magnetic properties, poor uniformity of coating thickness, and adverse effects on magnetic properties, to achieve improved uniform distribution. Sex, good magnetic performance, and the effect of eliminating the decline of magnetic performance
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Embodiment 1
[0021] Embodiment one: a kind of NdFeB magnet electroplating nickel method, comprises the following steps:
[0022] ① Pretreatment of NdFeB magnets;
[0023] ②Nickel pre-plating: put the pre-treated NdFeB magnet into the first nickel electroplating solution for pre-nickel plating for 3500 seconds, in which the first nickel electroplating solution is composed of nickel sulfate, boric acid, and sodium succinate , sodium carboxyethylsulfonate and water, the mass volume concentration of nickel sulfate is 250 g / L, the mass volume concentration of boric acid is 40 g / L, the mass volume concentration of succinate sodium salt is 5 mg / L, carboxylate The mass volume concentration of sodium ethyl sulfonate is 5 milligrams per liter, and the current density is 0.2 ampere / square decimeter in the pre-nickeling treatment process, and the temperature of the first electroplating nickel solution is 45 degrees Celsius, and the pH value is 4.1;
[0024] ③ Use deionized water to clean the pre-nick...
Embodiment 2
[0036] Embodiment two: a kind of NdFeB magnet electroplating nickel method, comprises the following steps:
[0037] ① Pretreatment of NdFeB magnets;
[0038] ②Nickel pre-plating: put the pre-treated NdFeB magnet into the first nickel electroplating solution for pre-nickel plating for 3500 seconds, in which the first nickel electroplating solution is composed of nickel sulfate, boric acid, and sodium succinate , sodium carboxyethylsulfonate and water, the mass volume concentration of nickel sulfate is 250 g / L, the mass volume concentration of boric acid is 40 g / L, the mass volume concentration of succinate sodium salt is 5 mg / L, carboxylate The mass volume concentration of sodium ethyl sulfonate is 5 milligrams per liter, and the current density is 0.2 ampere / square decimeter in the pre-nickeling treatment process, and the temperature of the first electroplating nickel solution is 45 degrees Celsius, and the pH value is 4.1;
[0039] ③ Use deionized water to clean the pre-nick...
Embodiment 3
[0058] Embodiment three: this embodiment is basically the same as embodiment two, and the difference is only that in this embodiment, the pretreatment process includes the following steps:
[0059] ①-1 Pickling: use dilute nitric acid solution as the pickling solution to pickle the NdFeB magnet;
[0060] ①-2 Washing: Use deionized water to clean the pickled NdFeB magnet several times. During the cleaning process, ultrasonic cleaning is provided. The ultrasonic power is 2000W and the frequency is 60KHz;
[0061] ①-3 Put the washed NdFeB magnet into the electrolytic tank for electrolytic treatment. The electrolytic treatment time is 450 seconds. The electrolyte is composed of sodium hydroxide, sodium carbonate and water, and the mass volume concentration of sodium hydroxide is 60 grams. / liter, the mass volume concentration of sodium carbonate is 40 grams per liter, and the current density is 0.7 amperes / square decimeter in the electrolytic treatment process, and the electrolyt...
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