Method of raising binding force of chemical coating on the surface of NdFeB permanent magnet
A surface chemical and permanent magnet technology, applied in the direction of liquid chemical plating, coating, metal material coating process, etc., can solve problems such as shedding, many pores, poor bonding between the coating and the magnet, and achieve excellent corrosion resistance. The effect of improving the process quality and strengthening the degreasing effect
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Embodiment 1
[0019] (1) The magnet is subjected to ultrasonic alkaline degreasing. The formula of the degreasing liquid is: sodium hydroxide 12g / L, trisodium phosphate 50g / L, sodium carbonate 15g / L, sodium silicate 10g / L, surfactant 1.5 g / L, OP-10 emulsifier 1g / L, use acetic acid to adjust the pH value of the degreasing solution to pH=10; the degreasing temperature is 50°C, the ultrasonic frequency is 40kHz, the power is 100W, and the degreasing time is 10min. After degreasing the magnet, shake it in deionized water at 50°C for 5 minutes.
[0020] (2) Magnet pickling activation, the formula of activation solution: hydrochloric acid 5g / L, nitric acid 10g / L, surfactant 1.5g / L, corrosion inhibitor 1g / L, treatment at room temperature, time is 10s; magnet pickling Rinse with deionized water for 60s after activation, and immediately place it in the plating solution for plating.
[0021] (3) Ultrasonic pre-plating, the plating solution formula is: nickel sulfate 0.08mol / L, sodium hypophosphite 0...
Embodiment 2
[0024] (1) The magnet is subjected to ultrasonic alkaline degreasing. The formula of the degreasing liquid is: sodium hydroxide 10g / L, trisodium phosphate 70g / L, sodium carbonate 20g / L, sodium silicate 8g / L, surfactant 2g / L, OP-10 emulsifier 1.5g / L, use acetic acid to adjust the pH value of the degreasing solution to pH=9; the degreasing temperature is 70°C, the ultrasonic frequency is 40kHz, the power is 250W, and the degreasing time is 3min. After degreasing the magnet, shake it in deionized water at 70°C for 5 minutes.
[0025] (2) Magnet pickling activation, the formula of activation solution: hydrochloric acid 1g / L, nitric acid 15g / L, surfactant 2g / L, corrosion inhibitor 1.5g / L, treatment at room temperature, time is 60s; magnet pickling Rinse with deionized water for 60s after activation, and immediately place it in the plating solution for plating.
[0026] (3) Ultrasonic pre-plating, the plating solution formula is: nickel sulfate 0.12mol / L, sodium hypophosphite 0.40...
Embodiment 3
[0029] (1) The magnet is subjected to ultrasonic alkaline degreasing, and the formula of the degreasing liquid is: sodium hydroxide 15g / L, trisodium phosphate 60g / L, sodium carbonate 30g / L, sodium silicate 5g / L, surfactant 1g / L, OP-10 emulsifier 2g / L, use acetic acid to adjust the pH value of the degreasing solution to pH=9.5; the degreasing temperature is 65°C, the ultrasonic frequency is 40kHz, the power is 200W, and the degreasing time is 5min. After degreasing the magnet, shake it in deionized water at 65°C for 5 minutes.
[0030] (2) Magnet pickling activation, the formula of activation solution: hydrochloric acid 2g / L, nitric acid 12g / L, surfactant 1g / L, corrosion inhibitor 2g / L, treatment at room temperature, time is 40s; magnet pickling activation Afterwards, rinse with deionized water for 60s, and immediately place it in the plating solution for plating.
[0031] (3) Ultrasonic pre-plating, the plating solution formula is: nickel sulfate 0.10mol / L, sodium hypophosph...
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