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Magnetic powder core rust-prevention process

A magnetic powder core and process technology, applied in metal material coating process, coating, etc., can solve the problems of large environmental pollution, high painting cost, and difficulty in realizing long-term rust prevention of magnetic powder core products, so as to achieve obvious bridging effect and prevent rust. rust effect

Active Publication Date: 2020-07-03
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem that it is difficult to achieve long-term rust prevention of magnetic powder core products by directly dipping anti-rust oil, and to overcome the problems of high painting cost, large environmental pollution, increased product size, and reduced electromagnetic properties of magnetic powder core products. Proposed a magnetic powder core anti-rust process

Method used

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  • Magnetic powder core rust-prevention process

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Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1: a kind of antirust process of magnetic powder core, comprises the following steps:

[0028] 1) The magnetic powder core is submerged in 50wt% sodium hydroxide solution, soaked at 70°C for 30 minutes, then washed the residual lye with water, then immersed in 5wt% phosphoric acid solution, soaked at 70°C for 30 minutes, and finally washed the residual acid with water Liquid, and dry, remove the oil stains on the surface of the magnetic powder core and achieve passivation;

[0029] 2) Mix dodecyltriethoxysilane, ammonia water and ethanol to obtain an alkylsilane coupling agent solution, wherein the mass concentration of dodecyltriethoxysilane is 5%, and the mass concentration of ammonia water is 2%; then Immerse the magnetic powder core in the alkylsilane coupling agent solution at 60°C and a vacuum of -0.05Mpa, take it out and dry it after 30 minutes to achieve surface hydrophobicity;

[0030] 3) Immerse the magnetic powder core with hydrophobic surface in ...

Embodiment 2

[0031] Embodiment 2: a kind of antirust process of magnetic powder core, comprises the following steps:

[0032] 1) The magnetic powder core is submerged in a mixed solution of 45wt% sodium hydroxide and 25wt% sodium nitrate, soaked at 70°C for 30 minutes, and then washed with water to wash the residual lye, and then immersed in a mixed solution of 5wt% phosphoric acid and 5wt% nitric acid. Soak at ℃ for 30 minutes, and finally wash the residual acid solution with water and dry to remove oil stains on the surface of the magnetic powder core and achieve passivation;

[0033] 2) Mix octyltrimethoxysilane, acetic acid and water to obtain an alkylsilane coupling agent solution, in which the mass concentration of octyltrimethoxysilane is 1.5%, and the mass concentration of acetic acid is 3%; then the magnetic powder core is heated at 60°C , immersed in the alkylsilane coupling agent solution at a vacuum of -0.09Mpa, take it out and dry it after 30 minutes to achieve surface hydroph...

Embodiment 3

[0035] Embodiment 3: a kind of antirust process of magnetic powder core, comprises the following steps:

[0036] 1) The magnetic powder core is submerged in 10wt% trisodium phosphate solution, soaked at 70°C for 30min, then washed the residual lye with water, then immersed in 0.3wt% hydrochloric acid solution, soaked at 70°C for 30min, and finally rinsed with water Acid solution, and dry to remove oil stains on the surface of the magnetic powder core and achieve passivation;

[0037] 2) Mix cetyltrimethoxysilane, formic acid and methanol to obtain an alkylsilane coupling agent solution, in which the mass concentration of cetyltrimethoxysilane is 0.1%, and the mass concentration of formic acid is 0.3%; then the magnetic powder The core is immersed in the alkylsilane coupling agent solution at 60°C and the vacuum degree is -0.07Mpa, and it is taken out and dried after 30 minutes to achieve surface hydrophobicity;

[0038] 4) Immerse the magnetic powder core with hydrophobic sur...

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Abstract

The invention discloses a magnetic powder core rust-prevention process, and relates to the technical field of magnetic powder core preparation. The magnetic powder core rust-prevention process comprises the following steps that (1) The magnetic powder core undergoes a surface passivation process to remove oil stains and achieve surface passivation; (2) an alkylsilane coupling agent, a catalyst anda solvent are mixed to obtain an alkylsilane coupling agent solution, and then a magnetic powder core is immersed in the alkylsilane coupling agent solution under the vacuum condition to achieve surface hydrophobicity; and (3) the magnetic powder core subjected to surface hydrophobicity is immersed in rust-prevention oil under the vacuum condition to achieve long-term rust-prevention of the magnetic powder core. A three-layer rust-prevention film is formed on the surface of the magnetic powder core, the middle layer is a silane coupling agent layer and is equivalent to the role of a bridge, one end of the middle layer firmly reacts on the magnetic powder core surface through the Si-O bond, the other end of the middle layer is firmly combined with the rust-prevention oil through a long alkyl chain, and the surface and internal pores and gaps of the magnetic powder core are truly completely cover with the rust-prevention oil to achieve the purpose of long-term rust-prevention; and the magnetic powder core rust-prevention process is simple, environmentally friendly and suitable for industrial use.

Description

technical field [0001] The invention relates to the technical field of magnetic powder core preparation, in particular to a magnetic powder core antirust process. Background technique [0002] Magnetic powder mainly refers to the powder containing metals such as iron, iron-silicon alloy, iron-silicon-aluminum alloy, iron-nickel alloy, iron-nickel-molybdenum alloy and ferrite. The magnetic powder core is a composite soft magnetic material formed by mixing and pressing ferromagnetic powder and insulating medium. Magnetic powder cores have the characteristics of easy processing and low loss, and are widely used in electronic components such as inverters, inductors, transformers and choke coils, involving computers, mobile phones, power supplies, motors and many other fields. [0003] However, the magnetic powder core has the disadvantage that it is easy to rust. At present, the methods for inhibiting the rust of the magnetic powder core mainly include spraying paint and dippin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/02C23G1/19C23G1/08C23C22/62C23C22/06C23C26/00
CPCC23C22/06C23C22/62C23C26/00C23F11/02C23G1/08C23G1/083C23G1/085C23G1/19
Inventor 李根姚骋张丛金志洪申建伟
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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