NdFeB zinc series phosphating solution and application method thereof

A zinc-based phosphating liquid, NdFeB technology, applied in the direction of metal material coating process, can solve the problems of phosphating film thickness, poor alkali resistance of phosphating film, etc., achieve less slag, excellent corrosion resistance, phosphorus The effect of chemical film densification

Inactive Publication Date: 2016-06-22
QINGDAO XINPURUI DETECTION TECH CO LTD
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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 relatively 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 phosphating solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A kind of neodymium-iron-boron-zinc phosphating solution, its composition includes Zn 2+ 、PO 4 3- , NO 3 - , F - , accelerator and Ni 2+ , where Zn 2+ 、PO 4 3- , NO 3 - , F - And accelerator according to the substance concentration ratio is 68:180:130:60:5, Ni 2+ The concentration of the accelerator is 0.15g / L, and the concentration of the accelerator is 0.2g / L. After the phosphating solution and water are made into a working solution in a ratio of 1:10, the process parameters of the working solution are free acidity 6.5 points, total acidity 33 points, phosphating temperature 52 ° C, phosphating time 11 minutes to treat NdFeB , produce light gray to gray phosphate film, 3% neutral salt water immersion time is more than 3 hours. After cathodic electrophoresis, the cross-cut test of the paint film is 0 grade, and the neutral salt spray test is 550 hours.

Embodiment 2

[0047] A kind of neodymium-iron-boron-zinc phosphating solution, its composition includes Zn 2+ 、PO 4 3- , NO 3 - , F - , accelerator and Ni 2+ , where Zn 2+ 、PO 4 3- , NO 3 - , F - And accelerator according to the substance concentration ratio is 60:168:146:50:3, Ni 2+ The concentration of the accelerator is 0.2g / L, and the concentration of the accelerator is 0.5g / L. After the phosphating solution and water are made into a working solution in a ratio of 1:10, the process parameters of the working solution are free acidity 6 points, total acidity 38 points, phosphating temperature 50 ° C, phosphating time 15 minutes to treat NdFeB , produce light gray to gray phosphate film, 3% neutral salt water immersion time is more than 3 hours. The cross-cut test of the paint film after cathodic electrophoresis is 0 grade, and the neutral salt spray test is 580 hours.

Embodiment 3

[0049] A kind of neodymium-iron-boron-zinc phosphating solution, its composition includes Zn 2+ 、PO 4 3- , NO 3 - , F - , accelerator and Ni 2+ , where Zn 2+ 、PO 4 3- , NO 3 - , F - The concentration ratio of the accelerator and the substance is 54:182:135:67:4, Ni 2+ The concentration of the accelerator is 0.05g / L, and the concentration of the accelerator is 1.2g / L. After the phosphating solution and water are made into a working solution in a ratio of 1:10, the process parameters of the working solution are 8 points of free acidity, 40 points of total acidity, phosphating temperature of 55 ° C, and phosphating time of 10 minutes to treat NdFeB , produce light gray to gray phosphate film, 3% neutral salt water immersion time is more than 3 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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PUM

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Abstract

The invention discloses an NdFeB zinc series phosphating solution. The NdFeB zinc series phosphating solution is composed of Zn2+, PO43-, NO3-, F-, an accelerant and Ni2+, wherein the amount-of-substance concentration ratio of Zn2+ to PO43- to NO3- to F- to the accelerant is (54-74) :(163-183) :(126-146) :(50-70) :(3-5), the concentration of the accelerant ranges from 0.1 g/L to 1.3 g/L, and the concentration of Ni2+ ranges from 0.01 g/L to 0.2 g/L. The phosphating solution and water are prepared into a work solution according to the ratio of 1:10. According to work parameters, the free acidity ranges from 5% to 8%, the total acidity ranges from 30% to 40%, the phosphating temperature ranges from 50 DEG C to 55 DEG C, the phosphating time ranges from 10 minutes to 15 minutes, NdFeB is treated to generate a light grey or grey phosphating film, the soaking time of 3% neutral saline water is three hours or above, the cross-cut test of a paint film obtained after cathode electrophoresis is the degree 0, and the time of the neutral salt spray test of the paint film obtained after cathode electrophoresis is 550 hours or above. The phosphating solution is high in film-forming thickness and fine in film layer crystallization on treated workpieces, the surface is smooth and dense, the corrosion resistance is excellent, the solution is stable, less sediment is generated, and the time of the salt spray test is longer; and meanwhile no organic complexing agent is included in the formula, the enterprise cost is reduced, and the environment is protected.

Description

technical field [0001] The invention relates to the field of metal surface treatment, in particular to a neodymium-iron-boron-zinc phosphating solution and a use method thereof. Background technique [0002] At present, the anti-corrosion technology of NdFeB surface includes electroplating, organic coating and composite coating. [0003] Due to the relatively low equipment cost of the electroplating process. The shortcomings of the electroplating coating are also quite obvious: the consistency and stability of the product quality are generally poor, the coating has a large porosity, the film is not dense, and has shape dependence. plating. For some severe occasions, after long-term use of the coating, problems such as cracking, peeling, and easy falling off will occur, and the protective performance will decrease. [0004] The use of electrostatic spraying or electrophoretic deposition coating process can obtain relatively high film quality, which is more suitable for bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/36C23C22/44
CPCC23C22/362C23C22/44
Inventor 王恩生
Owner QINGDAO XINPURUI DETECTION TECH CO LTD
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