A surface coating process for sintered NdFeB magnets
A technology of neodymium iron boron and magnets, which is applied in the direction of metal material coating process, coating, liquid chemical plating, etc., can solve the problems of poor bonding force, no essential improvement of salt spray resistance, large porosity, etc., to achieve Effects of reducing impact, good surface protection performance, and improving binding ability
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specific Embodiment 1
[0024] ①. Sintered NdFeB magnet black sheet, performance 45H, size 50×15×8, after chamfering for 8 hours, clean it with ultrasonic frequency of 20000 Hz for 2 to 3 minutes, then degrease and wash with water ; Put the NdFeB product washed with water into nitric acid with a concentration of 3 to 6 degrees Baume for pickling, and then wash with water and then immerse it in the surface adjustment solution.
[0025] Wherein the degreasing liquid comprises the following components: sodium hydroxide 3 g / L, sodium carbonate 60 g / L, trisodium phosphate 60 g / L, sodium silicate 20 g / L and the water of balance; The temperature is 75-95° C., the pH value is 10-13, and the degreasing treatment time is 10-20 minutes.
[0026] The pickling solution includes the following components: nitric acid with a concentration of 3 to 6 Baume degrees and an inhibitor, and the inhibitor is 10 g / L urea; the time of pickling treatment is controlled until the NdFeB product is washed.
[0027] The surface ad...
specific Embodiment 2
[0035] ①. The sintered NdFeB magnet black sheet, performance 45H, specification R40.2×10×5.05×50, after chamfering for 6 hours, clean it with ultrasonic frequency of 30000 Hz for 1 to 2 minutes, and then remove Cleaning with oil and water; put the NdFeB product after water cleaning into nitric acid with a concentration of 3 to 6 degrees Baume for pickling, then wash with water and then immerse it in the surface conditioning solution.
[0036]Wherein the degreasing liquid comprises the following components: sodium hydroxide 15 g / L, sodium carbonate 90 g / L, trisodium phosphate 80 g / L, sodium silicate 15 g / L and the water of the balance; and the degreasing liquid The temperature is 75-95° C., the pH value is 10-13, and the degreasing treatment time is 10-20 minutes.
[0037] The pickling solution includes the following components: nitric acid with a concentration of 3 to 6 Baume degrees and an inhibitor, and the inhibitor is 20 g / L urea; the time of pickling treatment is controll...
specific Embodiment 3
[0046] ①. The sintered NdFeB magnet black sheet, performance 45M, specification φ8.3~φ4.5×15, chamfered for 5 hours, cleaned with ultrasonic frequency of 40000 Hz for 0.5 minutes, followed by degreasing and Washing with water: put the NdFeB product after washing with water into nitric acid with a concentration of 3-6 degrees Baume for pickling, then wash with water and then immerse in the surface conditioning solution.
[0047] Wherein the degreasing liquid comprises the following components: sodium hydroxide 10 g / L, sodium carbonate 30 g / L, trisodium phosphate 70 g / L, sodium silicate 10 g / L and the water of the remainder; and the degreasing liquid The temperature is 75-95° C., the pH value is 10-13, and the degreasing treatment time is 10-20 minutes.
[0048] The pickling solution includes the following components: nitric acid with a concentration of 3-6 Baume degrees and an inhibitor, and the inhibitor is 30 g / L urea; the time of pickling treatment is controlled until the Nd...
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