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Magnetic material phosphating solution

A magnetic material and phosphating solution technology, which is applied in the coating process of metal materials, etc., can solve the problems that there is no final treatment protective layer scheme for NdFeB magnetic materials, and achieve solution stability, fast phosphating speed, and less sediment Effect

Active Publication Date: 2015-10-07
NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

None of these patents propose a solution for the final treatment protective layer of NdFeB magnetic materials

Method used

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  • Magnetic material phosphating solution

Examples

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Effect test

Embodiment 1

[0022] A magnetic material phosphating solution, which is composed of the following components: zinc dihydrogen phosphate 100g / L, Maziv salt 120g / L, zinc nitrate 90g / L, phosphoric acid 180g / L, nitric acid 60g / L, citric acid 10g / L, sodium dihydrogen phosphate 80g / L, nickel nitrate 25g / L, calcium nitrate 100g / L.

[0023] Mix the magnetic phosphating solution with deionized water at a volume ratio of 1:5, dilute, soak the magnetic material for 20 minutes at a temperature of 95°C, and wash to obtain a phosphating film. The properties of this phosphating solution are stable under high temperature treatment, and the obtained phosphating film is compact and uniform. The corrosion resistance of the phosphating film is tested by the copper sulfate drop test (QB / T3824-1999). The copper sulfate drop test time is greater than 40 seconds. .

Embodiment 2

[0025] A magnetic material phosphating solution, composed of the following components: 200g / L zinc dihydrogen phosphate, 150g / L Maziv salt, 50g / L zinc nitrate, 303g / L phosphoric acid, 50g / L nitric acid, 20g tartaric acid / L, boric acid 100g / L, manganese nitrate 30g / L, sodium nitrate 50g / L.

[0026] Mix the magnetic phosphating solution with deionized water at a volume ratio of 1:8, dilute, soak the magnetic material for 16 minutes at a temperature of 90°C, and wash to obtain a phosphating film. The phosphating solution of embodiment 2 is under high temperature treatment, and the solution property is more stable, and the phosphating film obtained is denser and more uniform, adopts copper sulfate drop test (QB / T3824-1999) to test the corrosion resistance of phosphating film, copper sulfate drop test The test time is greater than 30 seconds.

Embodiment 3

[0028] A magnetic material phosphating solution, which is composed of the following components: zinc dihydrogen phosphate 180g / L, Maziv salt 200g / L, zinc nitrate 100g / L, phosphoric acid 303g / L, nitric acid 60g / L, sulfo Salicylic acid 10g / L, sodium dihydrogen phosphate 100g / L, copper nitrate 10g / L 200mg / L, nickel nitrate 20g / L, calcium nitrate 120g / L.

[0029] Mix the magnetic phosphating solution with deionized water at a volume ratio of 1:10, dilute, soak the magnetic material for 15 minutes at a temperature of 95°C, and wash to obtain a phosphating film. The phosphating solution is stable under high temperature treatment, and the obtained phosphating film is dense and uniform. The corrosion resistance of the phosphating film is tested by copper sulfate drop test (QB / T3824-1999). The copper sulfate drop test time is more than 30 seconds. .

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Abstract

The invention discloses a magnetic material phosphating solution, which consists of the following components: 20-200g / L of zinc dihydrogen phosphate, 50-200g / L of manganous dihydrogen phosphate, 50-200g / L of zinc nitrate, 100-303g / L of phosphoric acid, 100-303g / L of nitric acid, 5-20g / L of complexing agent, 50-100g / L of a buffering agent, 10-30g / L of an auxiliary film-forming agent and 50-120g / L of a promoting agent. A phosphating film formed by the phosphating solution disclosed by the invention is high in corrosion resistance and can be used as an ultimate treatment protection film layer, and no subsequent coating treatment is required. The phosphating speed of the phosphating solution is high, the film layer is fine in crystallization, the solution is stable, and sediment is settled; the shortcomings that too much sediment is settled in a high-temperature phosphating process of a common phosphating solution and the formed phosphating film is low in corrosion resistance are overcome.

Description

technical field [0001] The invention belongs to the technical field of magnetic material surface treatment, and in particular relates to a magnetic material phosphating solution. Background technique [0002] NdFeB magnetic materials have extremely high magnetic energy product and coercive force, and the advantages of high energy density make NdFeB permanent magnet materials widely used in modern industry and electronic technology, so that instruments, electroacoustic motors, magnetic Miniaturization, weight reduction, and thinning of equipment such as magnetization are possible. Due to the poor corrosion resistance of NdFeB magnets, which are prone to powder corrosion, surface treatments such as electroplating, electrophoresis, phosphating, vacuum vapor deposition, and plastic spraying must be adopted to meet the requirements of practical applications. Electroplating, electrophoresis, vacuum vapor deposition, and plastic spraying are complex in process operation, high in c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/07
Inventor 王修春潘喜庆伊希斌王小军张晶
Owner NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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