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High-corrosion resistance neodymium iron boron magnetic material phosphating solution and using method

A technology of magnetic material and phosphating liquid, applied in the direction of metal material coating process, etc., can solve the problem of insignificant effect, etc., and achieve the effect of improving corrosion resistance.

Inactive Publication Date: 2018-02-09
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

Someone proposed the method of first phosphating and then passivation to improve its corrosion resistance, but the effect is not obvious

Method used

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  • High-corrosion resistance neodymium iron boron magnetic material phosphating solution and using method
  • High-corrosion resistance neodymium iron boron magnetic material phosphating solution and using method

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Phosphating solution formula: Zn 2+ :PO 4 3- :Phytic acid:NO 3 - :F - : Accelerator (mass ratio) is 3:20:0.5:8:1.2:1, Ni 2+ 0.1g / L, accelerator 1.0g / L, and the rest is water. The free acidity of the phosphating working solution is 6.2 points, the total acidity is 30 points, the phosphating temperature is 50°C, and the phosphating time is 8 minutes. The NdFeB is treated with the phosphating solution of the present invention 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, the neutral salt spray test is 500 hours, and the damp heat double 85% test is 30 minutes.

Embodiment 2

[0035] Phosphating solution formula: Zn 2+ :PO 4 3- :Phytic acid:NO 3 - :F - : Accelerator (mass ratio) is 8:20:1.4:10:0.9:1, Ni 2 + 0.05g / L, accelerator 1.0g / L, and the rest is water. The free acidity of the phosphating working solution is 5.5 points, the total acidity is 28 points, the phosphating temperature is 50°C, and the phosphating time is 10 minutes. A light gray phosphating film is formed, and the soaking time in 3% neutral salt water is 3.5 hours. After cathodic electrophoresis, the cross-cut test of the paint film is 0 grade, the neutral salt spray test is 500 hours, and the damp heat double 85% test is 30 minutes.

[0036] Such as figure 1 As shown, the left side is the appearance picture of the phosphating film obtained in Example 1, and the right side is the appearance picture of the phosphating film obtained in Example 2. It is obvious that when the concentration of phytic acid is high, the obtained phosphating film is compact, uniform and flat. it is...

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Abstract

The invention provides a high-corrosion resistance neodymium iron boron magnetic material phosphating solution and a using method and belongs to the technical field of metal surface treatment. The mass ratio of Zn<2+>: PO4<3->: NO<3->: F<->: an accelerant is (3-8): (10-20): (8-15): (0.8-2): 1, wherein Ni<2+> ranges from 0.01g / L to 0.1g / L, the accelerant ranges from 0.1g / L to 1g / L, the balance is water, 0.5%-2% phytic acid is added to the phosphating solution, and meanwhile, a 0.1%-0.5% auxiliary is introduced to enhance the film forming capability of the phytic acid. In the using process of the phosphating solution, the free acidity of the phosphating working liquid is 4-7, the total acidity is 25-35, the phosphating temperature ranges from 50 DEG C to 60 DEG C, and the phosphating time is8-12 minutes. The phosphating solution is used for treating neodymium iron boron, a phosphating film in light gray to gray is generated, and the phosphating film is soaked in 3% neutral salt for 3 hours or above. The cross-cut test of the treated electrophoresis paint film made of a neodymium iron boron material is 0 level, and a neutral salt spray test is carried out for 500 hours. The using method is simple, and the corrosion prevention performance of the surface phosphating film of the neodymium iron boron can be enhanced.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a phosphating solution of a high corrosion-resistant NdFeB magnetic material and a use method thereof. Background technique [0002] In the rare earth deep processing industry, neodymium iron boron (Nd 2 Fe 14 B) The permanent magnet is the product with the largest output value at present, and the market prospect is broad. However, due to the special multiphase structure of NdFeB magnets, its corrosion resistance is adversely affected. Usually NdFeB is composed of thin-layer neodymium-rich and boron-rich phases and base phase Nd 2 Fe 14 Composed of phase B, 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 form countless micro "batteries" due to the dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/36
CPCC23C22/362
Inventor 杨波秦志伟张彦
Owner 中化化工科学技术研究总院有限公司