Tin-nickel alloy plating solution used for plating neodymium iron boron permanent magnet material and method for plating neodymium iron boron permanent magnet material by adopting same

[0032] Example 1

[0033] 3 kg D15*4 sintered NdFeB permanent magnet material was polished in a vibrating mill for 3 hours. Use 10L degreasing agent, its composition is sodium phosphate 30g/liter, sodium carbonate 8g/liter and sodium hydroxide 8g/liter. After degreasing and degreasing the neodymium iron boron permanent magnet material, it is removed by pickling with 5% nitric acid solution The oxide on the surface of the neodymium iron boron permanent magnet material is then washed 3 times with water. Then use 5% sulfuric acid solution to activate the neodymium iron boron permanent magnet material, then electroplating, put the pretreated neodymium iron boron permanent magnet material into the tin-nickel alloy plating solution, the composition of the tin-nickel alloy plating solution It is: 20 grams/liter of stannous chloride, 20 grams/liter of nickel chloride hexahydrate, 180 grams/liter of potassium pyrophosphate, 4ml/L of ammonia, 15 grams/liter of aminoacetic acid, 2 grams of complexing agent ethylene diamine /Rise,. When electroplating, the temperature of the tin-nickel alloy plating solution is 45℃, the pH is 7.5, and the current density is 0.5A/dm 2 , The plating time is 200min. After electroplating, the thickness of the tin-nickel alloy plating layer is 18 microns. Clean the tin-nickel alloy coating with deionized water for three times, then pass the NdFeB permanent magnet material through the sealing agent to seal the hole. After the hole is sealed, use a hair dryer to dry the surface of the NdFeB permanent magnet material, and finally in an oven at 100℃ Dry for 20 minutes. Among them, the sealing agent used is NF1080 water-based nickel plating sealing agent produced by Guangzhou Tianzhi Environmental Protection Technology Co., Ltd.

[0034] Example 2

[0035] 3 kg D15*4 sintered NdFeB permanent magnet material was polished in a vibrating mill for 3 hours. Use 10L degreasing agent, its composition is sodium phosphate 30g/liter, sodium carbonate 8g/liter and sodium hydroxide 8g/liter. After degreasing and degreasing the neodymium iron boron permanent magnet material, it is removed by pickling with 5% nitric acid solution The oxide on the surface of the neodymium iron boron permanent magnet material is then washed 3 times with water. Then use 5% sulfuric acid solution to activate the neodymium iron boron permanent magnet material, then electroplating, put the pretreated neodymium iron boron permanent magnet material into the tin-nickel alloy plating solution, the composition of the tin-nickel alloy plating solution It is: stannous chloride 30g/l, nickel chloride hexahydrate 30g/l, potassium pyrophosphate 200g/l, ammonia water 6ml/L, aminoacetic acid 20g/l, complexing agent ethylenediamine 4g/l Rise. When electroplating, the temperature of the tin-nickel alloy plating solution is 50℃, the pH is 8.0, and the current density is 1A/dm 2 , The plating time is 100min. After electroplating, the thickness of the tin-nickel alloy coating is 15 microns. Clean the tin-nickel alloy coating three times with deionized water, and then pass the NdFeB permanent magnet material through the sealing liquid to seal the hole. After the hole is sealed, use a hair dryer to dry the moisture on the surface of the NdFeB permanent magnet material, and finally in an oven at 100℃ Dry for 20 minutes. Among them, the sealing agent used is NF1080 water-based nickel plating sealing agent produced by Guangzhou Tianzhi Environmental Protection Technology Co., Ltd.

[0036] Example 3

[0037] 3 kg D15*4 sintered NdFeB permanent magnet material was polished in a vibrating mill for 3 hours. Use 10L degreasing agent, its composition is sodium phosphate 30g/liter, sodium carbonate 8g/liter and sodium hydroxide 8g/liter. After degreasing and degreasing the neodymium iron boron permanent magnet material, it is removed by pickling with 5% nitric acid solution The oxide on the surface of the neodymium iron boron permanent magnet material is then washed 3 times with water. Then use 5% sulfuric acid solution to activate the neodymium iron boron permanent magnet material, then electroplating, put the pretreated neodymium iron boron permanent magnet material into the tin-nickel alloy plating solution, the composition of the tin-nickel alloy plating solution It is: stannous chloride 40 g/l, nickel chloride hexahydrate 40 g/l, potassium pyrophosphate 220 g/l, ammonia water 8ml/L, glycine 25 g/l, complexing agent ethylene diamine 6 g/l When electroplating, the temperature of the tin-nickel alloy plating solution is 55℃, the pH is 8.5, and the current density is 1.5A/dm 2 , The electroplating time is 60min. After electroplating, the thickness of the tin-nickel alloy coating is 12 microns. Clean the tin-nickel alloy coating three times with deionized water, and then pass the NdFeB permanent magnet material through the sealing liquid to seal the hole. After the hole is sealed, use a hair dryer to dry the moisture on the surface of the NdFeB permanent magnet material, and finally in an oven at 100℃ Dry for 20 minutes. Among them, the sealing agent used is NF1080 water-based nickel plating sealing agent produced by Guangzhou Tianzhi Environmental Protection Technology Co., Ltd.