Neodymium-iron-boron magnetic material zinc-series phosphatization liquid and application method thereof

A technology of zinc-based phosphating solution and magnetic material, applied in the direction of metal material coating process, etc., can solve the problems of phosphating film thickness, poor alkali resistance of phosphating film, unable to meet the requirements of large-scale production scale, etc. The effect of service life

Active Publication Date: 2013-12-04
中化化工科学技术研究总院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The NdFeB treated with this phosphating solution has a thick phosphating film, which is not suitable for cathodic electrophoretic coating, and the alkali resistance of the phosphating film is poor due to the high zinc content in the ph...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Phosphating solution formula: Zn 2+ :PO 4 3- :NO 3 - :F - : Accelerator (mass ratio) is 3.5:17:8:1.1:1, Ni 2+ 0.1g / L, organic complexing agent 0.09g / L, accelerator 1.5g / L, and the rest is water. The free acidity of the phosphating working solution is 7 points, the total acidity is 25 points, the phosphating temperature is 51°C, and the phosphating time is 10 minutes. Use the phosphating solution of the present invention to treat NdFeB to form a light gray phosphating film, and the soaking time in 3% neutral salt water is 3 hours. After cathodic electrophoresis, the cross-cut test of the paint film is 0 grade, and the neutral salt spray test is 500 hours.

Embodiment 2

[0039] Phosphating solution formula: Zn 2+ :PO 4 3- :NO 3 - :F - : The accelerator (mass ratio) is 8:30:10:0.95:1, Ni 2+ 0.2g / L, organic complexing agent 0.04g / L, accelerator 1.0g / L, and the rest is water. The free acidity of the phosphating working solution is 5 points, the total acidity is 26 points, the phosphating temperature is 48°C, and the phosphating time is 12 minutes. Use the phosphating solution of the present invention to treat NdFeB to form a light gray phosphating film, and the soaking time in 3% neutral salt water is 3.5 hours. The cross-cut test of the paint film after cathodic electrophoresis is 0 grade, and the neutral salt spray test is 560 hours.

Embodiment 3

[0041] Phosphating solution formula: Zn 2+ :PO 4 3- :NO 3 - :F - : Accelerator (mass ratio) is 10:35:19:2.6:1, Ni 2+ 0.03g / L, organic complexing agent 0.16g / L, accelerator 2.0g / L, and the rest is water. The free acidity of the phosphating working solution is 6 points, the total acidity is 28 points, the phosphating temperature is 55°C, and the phosphating time is 10 minutes. Use the phosphating solution of the present invention to treat NdFeB to form a gray phosphating film, and the soaking time in 3% neutral salt water is 3.5 hours. The cross-cut test of the paint film after cathodic electrophoresis is 0 grade, and the neutral salt spray test is 560 hours.

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Abstract

The invention relates to the field of metal surface treatment, and especially relates to a neodymium-iron-boron magnetic material zinc-series phosphatization liquid. The phosphatization liquid is mainly used in neodymium-iron-boron surface anti-corrosion protection and cathodic electrophoresis priming and phosphatization. The liquid is characterized in that a mass ratio of Zn<2+>:PO4<3->:NO<3->:F<->:an accelerator is (3.5-10.5):(14-41.3):(7.3-21.9):(0.95-2.8):1, Ni<2+> is 0.01-0.2g/L, an organic complexing agent is 0.04-0.18g/L, the promoter is 0.2-1.5g/L, and balance is water. Free acidity of a phosphatization working liquid is 3-8 points, a total acidity is 22-32 points, a phosphatization temperature is 48-55 DEG C, and a phosphatization time is 6-15min. When the phosphatization liquid is used for treating neodymium-iron-boron, a light grey to grey phosphate coating is produced, and 3% neutral salt water soaking time is above 3h. An electrophoresis coating cut test is 0 grade, and a neutral salt spray test is 500h.

Description

technical field [0001] The invention relates to the field of metal surface treatment, in particular to a zinc-based phosphating solution for neodymium-iron-boron magnetic materials, which is mainly used for anti-corrosion protection of the surface of neodymium-iron-boron magnetic materials and cathodic electrophoresis bottoming phosphating. Background technique [0002] NdFeB materials are small in size, light in weight and strong in magnetism, and are widely used in energy, transportation, communication, national defense, machinery, medical treatment, computers, home appliances and other fields. [0003] Usually NdFeB is composed of Nd-rich and boron-rich phases of thin layer phase and Nd2Fe14B phase of base phase. In order to obtain excellent magnetic properties, this composite metallographic structure is necessary. However, it is this complex phase structure that is detrimental to the oxidation resistance of the magnet. The different phases in contact with each other for...

Claims

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Application Information

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IPC IPC(8): C23C22/13
Inventor 王恩生
Owner 中化化工科学技术研究总院有限公司
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