A kind of NdFeB magnetic material phosphating solution

A technology of magnetic material and phosphating solution, applied in the field of NdFeB magnetic material surface anti-corrosion, NdFeB magnetic material phosphating solution, can solve the influence of magnetic properties of magnets without analysis, complex phosphating solution formulation, and phosphating process. Complex problems, to achieve the effect of weak acidity, fast speed and simple formula

Active Publication Date: 2018-12-21
YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Patent 201210481482.8 proposes a method to improve the corrosion resistance of the phosphating film on the surface of NdFeB permanent magnets, but the phosphating time is long, the phosphating process is complicated, the energy consumption is large, and the production efficiency is low
[0005] Patent 201510412944.4 proposes a phosphating solution as a protective layer for the final treatment of magnetic materials, but the formula of this phosphating solution is complicated, and the temperature of the phosphating solution is relatively high, so the influence on the magnetic properties of the magnet is not analyzed

Method used

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  • A kind of NdFeB magnetic material phosphating solution
  • A kind of NdFeB magnetic material phosphating solution
  • A kind of NdFeB magnetic material phosphating solution

Examples

Experimental program
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Effect test

Embodiment 1

[0018] The size of the NdFeB substrate is 13.4mm*3.8mm*14.5mm, the shape is irregular, the single weight is 4.430g magnet, the fluxmeter model is HT700, and the coil is XQ-2.

[0019] A phosphating solution for NdFeB magnetic materials, consisting of the following components: zinc dihydrogen phosphate 100g / L, phosphoric acid 200g / L, tannic acid 15g / L, calcium nitrate 10g / L, ammonium molybdate 20g / L , phytic acid 50g / L, auxiliary film-forming agent 30g / L, and the rest is water. Mix the phosphating solution with pure water at a volume ratio of 3:1 and dilute. The temperature of the phosphating working solution is 70°C. Use NaOH to adjust the acidity of the phosphating solution. The free acid is 5.5 points and the total acid is 13.5 points. After degreasing and derusting, soak in phosphating working solution for 600S, wash and dry to obtain phosphating magnets. The property of this phosphating solution is stable, and the obtained phosphating film is compact and uniform, and no r...

Embodiment 2

[0021] The size of the NdFeB substrate is 13.4mm*3.8mm*14.5mm, the shape is irregular, the single weight is 4.429g magnet, the fluxmeter model is HT700, and the coil is XQ-2.

[0022] A phosphating solution for NdFeB magnetic materials, consisting of the following components: zinc dihydrogen phosphate 100g / L, phosphoric acid 180g / L, tannic acid 13g / L, calcium nitrate 7g / L, ammonium molybdate 14g / L , phytic acid 65g / L, auxiliary film-forming agent 15g / L, and the rest is water. Mix the phosphating solution with pure water at a volume ratio of 4:1 and dilute. The temperature of the phosphating working solution is 50°C. Use NaOH to adjust the acidity of the phosphating solution. The free acid is 4.8 points and the total acid is 12.5 points. After degreasing and derusting, soak in phosphating working solution for 300S, wash and dry to get phosphating magnet. The property of this phosphating solution is stable, and the obtained phosphating film is dense and uniform, and no red rust...

Embodiment 3

[0024] The size of the NdFeB substrate is 13.4mm*3.8mm*14.5mm, the shape is irregular, the single weight is 4.432g magnet, the fluxmeter model is HT700, and the coil is XQ-2.

[0025] A phosphating solution for NdFeB magnetic materials, consisting of the following components: zinc dihydrogen phosphate 60g / L, phosphoric acid 150g / L, tannic acid 10g / L, calcium nitrate 5g / L, ammonium molybdate 10g / L , phytic acid 68g / L, auxiliary film-forming agent 17g / L, and the rest is water. Mix the phosphating solution with pure water at a volume ratio of 6:1 and dilute. The temperature of the phosphating working solution is 50°C. Use NaOH to adjust the acidity of the phosphating solution. The free acid is 4.5 points and the total acid is 12.0 points. After degreasing and derusting, soak in phosphating working solution for 60S, wash and dry to get phosphating magnet. The property of this phosphating solution is stable, and the obtained phosphating film is compact and uniform, and no red rust...

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Abstract

The invention relates to the field of neodymium iron boron magnetic material surface treatment, and is mainly applied to neodymium iron boron magnetic material surface corrosion preventing. A neodymium iron boron magnetic material phosphating solution is characterized by comprising 30 g / L-100 g / L of zinc dihydrogen phosphate, 100 g / L-200 g / L of phosphoric acid, 10 g / L-15 g / L of tannic acid, 5 g / L-10 g / L of calcium nitrate, 10 g / L-20 g / L of ammonium molybdate, 50 g / L-70 g / L of phytic acid, 10 g / L-30 g / L of an auxiliary film forming agent and the balance water. The phosphating solution is used for treating a neodymium iron boron material, due to the fact that the phosphating solution is poor in acidity, a magnet is not corroded, the irreversibility, magnetic flux (Br), coercivity (Hcj) and other magnetic properties of the magnet are kept unchangeable before and after phosphorization, and the phosphating solution is especially suitable for small magnets with the thickness smaller than 5 mm and the unit weight smaller than 5 g. The phytic acid is added in the phosphating solution, the film forming speed is high, a phosphating film is smaller than 2 microns in thickness and is far thinner than a traditional phosphating film, but the corrosion resistance is still better than that of a traditional phosphating solution, the high-temperature and damp-hot resisting time of the phosphating film is four hours, the surface of the magnet is free of red rust, and the phosphating film can serve as a final protection film.

Description

technical field [0001] The invention relates to the technical field of magnets, in particular to a phosphating solution for NdFeB magnetic materials, which is mainly used for surface anticorrosion of NdFeB magnetic materials. Background technique [0002] As the third-generation rare earth permanent magnet material, NdFeB magnets have extremely high magnetic energy product and coercive force, and the advantages of high energy density make them not only widely used in information technology, automobiles, nuclear magnetic resonance and motors, but also in wind power The application of environmentally friendly new energy fields such as power generation and hybrid vehicles is also increasing. The high magnetic energy of NdFeB stems from its special chemical composition and crystal phase structure: NdFeB magnets are made of Nd 2 Fe 14 The B main phase and the intergranular Nd-rich phase are composed. The electrochemical potential difference between the phases of this multi-phas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/42
CPCC23C22/42
Inventor 于永江杨琪
Owner YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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