Ultrasonic chemical nickel and phosphorus plating method for NdFeB material

An electroless nickel-phosphorus and ultrasonic technology is applied in the field of electroless plating, which can solve the problems of high energy consumption, fast water volatilization, poor stability, etc., and achieves the effects of uniform and dense coating, low plating temperature, and improved bonding force.

Inactive Publication Date: 2016-03-23
CHINA IRON & STEEL RES INST GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the energy input method of commonly used electroless nickel-phosphorus plating process is mainly water bath heating, acidic electroless plating is carried out at above 85°C, and alkaline electroless plating is carried out at 70-75°C, which consumes a lot of energy and is easy to deposit on the tank wall
During the plating process, the water volatilizes quickly, the plating solution is easy to age, the stability is poor, and the utilization rate of the reducing agent sodium hypophosphite is low; at the same time, the high temperature will also cause the modification of some materials to be plated, thus limiting it to a certain extent. its application

Method used

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  • Ultrasonic chemical nickel and phosphorus plating method for NdFeB material
  • Ultrasonic chemical nickel and phosphorus plating method for NdFeB material
  • Ultrasonic chemical nickel and phosphorus plating method for NdFeB material

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Experimental program
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Effect test

Embodiment 1

[0036] Embodiment 1 (prior art)

[0037] The NdFeB sample used in embodiment 1 is a bonded NdFeB sample, and the specification is a Φ24mm*3mm circular sheet. The electroless nickel-phosphorus plating process of embodiment 1 is as follows:

[0038] Mechanical grinding→ultrasonic degreasing for 10min→pickling and derusting for 30s→activation for 30s→conventional electroless nickel and phosphorus plating.

[0039] Among them, the composition of degreasing liquid in ultrasonic degreasing is: NaOH10g / L, NaOH 3 PO 4 70g / L, Na 2 CO 3 50g / L, emulsifier OP-100.5g / L, the balance is distilled water.

[0040] The composition of pickling and derusting solution is: 65% HNO 3 20ml / L, thiourea 2g / L, and the balance is distilled water.

[0041] The activation formula is 20 g / L of sulfosalicylic acid, 10 g / L of ammonium bifluoride, and the balance is distilled water.

[0042] The composition of nickel-phosphorus plating solution in conventional electroless nickel-phosphorus plating is: N...

Embodiment 2

[0043] Embodiment 2 (prior art)

[0044] The NdFeB sample that embodiment 2 adopts is bonded NdFeB sample, and specification is Φ 24mm*3mm circular sheet, and the electroless nickel-phosphorous plating process of embodiment 2 is as follows:

[0045] Mechanical grinding→physical sealing→ultrasonic degreasing for 10min→pickling and derusting for 30s→activation for 30s→conventional electroless nickel and phosphorus plating.

[0046] Among them, the composition of degreasing liquid in ultrasonic degreasing is: NaOH10g / L, NaOH 3 PO 4 70g / L, Na 2 CO 3 50g / L, emulsifier OP-100.5g / L, the balance is distilled water.

[0047] The composition of pickling and derusting solution is: 65% HNO 3 20ml / L, thiourea 2g / L, and the balance is distilled water.

[0048] The physical sealing is to use zinc stearate, heat the zinc stearate to 160°C to make it into a molten state, then put the cleaned sample into it, take it out after pressurized immersion for 20 minutes, at this time the surface ...

Embodiment 3

[0051] Embodiment 3 (prior art)

[0052] The NdFeB sample used in embodiment 3 is a bonded NdFeB sample, and the specification is a Φ24mm*3mm circular sheet. The electroless nickel-phosphorus plating process of embodiment 3 is as follows:

[0053] Mechanical grinding→Ultrasonic degreasing for 10min→Pickling and rust removal for 30s→Flash plating for 3min→Conventional electroless nickel and phosphorus plating.

[0054] Among them, the composition of degreasing liquid in ultrasonic degreasing is: NaOH10g / L, NaOH 3 PO 4 70g / L, Na 2 CO 3 50g / L, emulsifier OP-100.5g / L, the balance is distilled water.

[0055] The composition of pickling and derusting solution is: 65% HNO 3 20ml / L, thiourea 2g / L, and the balance is distilled water.

[0056] The composition of alkaline bath in flash plating is: NiSO 4 ·6H 2 O25g / L, HEDP60ml / L, thiourea 0.0018g / L, and distilled water as the balance, adjust the pH value of the alkaline solution with NaOH to make the pH of the alkaline solution ...

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Abstract

The invention belongs to the technical field of a chemical plating process and particularly relates to an ultrasonic chemical nickel and phosphorus plating method for an NdFeB material. The method comprises the following steps: mechanical grinding; ultrasonic degreasing; acid pickling and rust removing; flash plating; ultrasonic chemical nickel and phosphorus plating. Compared with a general chemical plating method, the ultrasonic chemical nickel and phosphorus plating method for the NdFeB material, disclosed by the invention, has the advantages that the plating temperature is low, a plated layer is more compact, better corrosion resistance is realized and the plated layer has a better binding force with a base body.

Description

technical field [0001] The invention belongs to the technical field of electroless plating technology, in particular to an ultrasonic electroless nickel phosphorus plating method for NdFeB materials. Background technique [0002] Compared with ordinary materials, NdFeB rare-earth permanent magnet materials have high magnetic energy product, coercivity and remanence. It is precisely because of such excellent properties that it has irreplaceable advantages in many fields. However, due to the relatively strong chemical activity and poor corrosion resistance of rare earth permanent magnet materials, effective surface treatment must be carried out to make them not only have high electromagnetic properties, high mechanical strength, but also high corrosion resistance. performance. [0003] Electroless nickel-phosphorus alloy plating has the advantages of dense coating structure, uniform thickness distribution, high hardness, strong corrosion resistance, good profiling, and little...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/36C23C18/18C23G1/02
CPCC23C18/36C23C18/1601C23C18/1806C23C18/1844C23G1/02
Inventor 杨培燕顾宝珊袁训华
Owner CHINA IRON & STEEL RES INST GRP
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