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Acid electrogalvanizing method of neodymium-iron-boron magnet

A technology of neodymium-iron-boron electroplating and galvanizing, applied in liquid cleaning methods, chemical instruments and methods, cleaning methods and utensils, etc., can solve the problems of non-electroplating, low current efficiency of alkaline galvanizing, etc., and achieve strong conductivity , Improve the efficiency of electroplating, the effect of high efficiency

Pending Publication Date: 2020-10-09
天津京磁电子元件制造有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the porosity of NdFeB materials, the technology of direct galvanizing on its substrate is acid galvanizing (potassium chloride or sulfuric acid washing system, the current efficiency of alkaline galvanizing is low, and it cannot be directly electroplated on NdFeB substrates. for electroplating)

Method used

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  • Acid electrogalvanizing method of neodymium-iron-boron magnet

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Embodiment 1

[0039] The invention provides a method for acid electrogalvanizing of neodymium-iron-boron magnets, which is characterized in that it comprises the following steps:

[0040] S1, using silicon carbide abrasives to remove the burrs on the surface of the NdFeB magnet raw material, and grinding the right angle at the corner of the NdFeB magnet raw material into an R angle to obtain an abrasive;

[0041] S2. Put the grinding material in a water-based metal cleaning agent solution with a mass fraction of 2%, and place it in a 20KHz ultrasonic wave at 40°C for 90s to obtain the first cleaning material, and then put the first cleaning material Placed in HNO with a mass fraction of 3% 3 solution at 10°C for 90s to obtain the second cleaning material, and then place the second cleaning material at 10°C in 20kHz ultrasonic treatment for 30s to obtain the preparatory material, wherein 1L of the metal cleaning agent includes chlorine Sodium chloride 150g, tartaric acid 2g, sodium lauryl s...

Embodiment 2

[0046] The invention provides a method for acid electrogalvanizing of neodymium-iron-boron magnets, which is characterized in that it comprises the following steps:

[0047] S1, using silicon carbide abrasives to remove the burrs on the surface of the NdFeB magnet raw material, and grinding the right angle at the corner of the NdFeB magnet raw material into an R angle to obtain an abrasive;

[0048] S2. Put the grinding material in a water-based metal cleaning agent solution with a mass fraction of 6%, and place it in an 80KHz ultrasonic wave at 60°C for 150s to obtain the first cleaning material, and then put the first cleaning material Placed in HNO with a mass fraction of 10% 3 solution at 35°C for 120s to obtain the second cleaning material, and then place the second cleaning material at 60°C in 80kHz ultrasonic wave for 90s to obtain the preparatory material, wherein 1L of the metal cleaning agent includes chlorine Sodium chloride 200g, tartaric acid 5g, sodium lauryl su...

Embodiment 3

[0053] The invention provides a method for acid electrogalvanizing of neodymium-iron-boron magnets, which is characterized in that it comprises the following steps:

[0054] S1, using silicon carbide abrasives to remove the burrs on the surface of the NdFeB magnet raw material, and grinding the right angle at the corner of the NdFeB magnet raw material into an R angle to obtain an abrasive;

[0055] S2. Put the grinding material in a water-based metal cleaning agent solution with a mass fraction of 4%, and place it in a 50KHz ultrasonic wave at 50°C for 120s to obtain the first cleaning material, and then put the first cleaning material Placed in HNO with a mass fraction of 6% 3 solution, treated at 20°C for 105s to obtain the second cleaning material, and then placed the second cleaning material in 50kHz ultrasonic wave at 35°C for 60s to obtain the preparatory material, wherein 1L of the metal cleaning agent included chlorine Sodium chloride 175g, tartaric acid 4g, sodium l...

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Abstract

The invention discloses an acid electrogalvanizing method of a neodymium-iron-boron magnet. According to the method, abrasive is sequentially subjected to cleaning through a metal cleaning agent solution, treatment through an HNO3 solution with the mass fraction of 3 to 10% and ultrasonic treatment and then is subjected to electroplating, an electroplating part is obtained, the electroplating partis sequentially subjected to treatment of an HNO3 solution with the mass fraction of 0.3 to 2.0% and treatment of a trivalent chromium passivation solution, drying is carried out, and a galvanizationpart is obtained. The method is easy to operate, high in efficiency and good in market popularization.

Description

technical field [0001] The invention relates to the field of electroplating. More specifically, the present invention relates to a method for acid electrogalvanizing of NdFeB magnets. Background technique [0002] Due to the porosity of NdFeB materials, the technology of direct galvanizing on its substrate is acid galvanizing (potassium chloride or sulfuric acid washing system, the current efficiency of alkaline galvanizing is low, and it cannot be directly electroplated on NdFeB substrates. electroplating). At present, zinc sulfate and potassium chloride galvanizing are mostly used in the industry. With the upgrading and optimization of electronic products, the size of some acoustic NdFeB products (mobile phones, speakers, bracelets, tablet computers, etc.) has been updated, and the size of acoustic NdFeB products is moving towards slender and thin. The direction of development, which requires strict requirements on the thickness of the coating, the thickness of the coat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D7/00C25D3/22C25D5/34C25D5/48B08B3/12C23C22/46C23G1/02
CPCB08B3/12C23C22/46C23C2222/10C23G1/02C25D3/22C25D5/34C25D5/48C25D7/001
Inventor 张健
Owner 天津京磁电子元件制造有限公司
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