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Hard disk drive spindle motor component of composite coating and composite coating method thereof

A technology of hard disk drive and composite coating, which is applied in the direction of magnetic circuit rotating parts, manufacturing motor generators, coatings, etc. Excellent anti-corrosion properties and the effect of reducing purity requirements

Active Publication Date: 2008-01-30
CHENGDU GALAXY MAGNETAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] According to the method described in the CN1073754C patent, when only a single electrophoretic coating is applied to the hard disk drive spindle motor parts, there is still a defect, that is, the pinholes formed at the contact parts of the motor parts and the electrode pins cannot be covered by the electrophoretic coating , so that the component substrate is exposed, and the exposed substrate is directly exposed to the environment without coating protection, and rust will occur, which will cause damage to the hard disk

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  • Hard disk drive spindle motor component of composite coating and composite coating method thereof

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Embodiment 1

[0021] A composite coated hard disk drive spindle motor magnet, comprising a motor magnet substrate 1, coated with a composite coating on the substrate 1, the composite coating consists of an inner electrophoretic coating 2 and an outer spray coating 3 The weight percentage of tin in the electrophoretic coating 2 is 225~300ppm, wherein the tin is composed of organic tin and inorganic tin, and the weight percentage of organic tin in the electrophoretic coating is 50ppm; the weight of tin in the spray coating 3 The percentage is 26-50ppm.

[0022] The composite coating method of the hard disk drive spindle motor magnet of the composite coating comprises the following process steps:

[0023] A. Coating an electrophoretic coating on the surface of the motor magnet substrate;

[0024] The weight percent of tin in the electrophoretic paint aqueous solution that adopts during electrophoresis is 45~60ppm, and wherein the weight percent of organotin is 10ppm, in order to satisfy the t...

Embodiment 2

[0030] A composite coated hard disk drive spindle motor magnet, comprising a motor magnet substrate 1, coated with a composite coating on the substrate 1, the composite coating consists of an inner electrophoretic coating 2 and an outer spray coating 3 The weight percentage of tin in the electrophoretic coating 2 is 140~225ppm, wherein the tin is composed of organic tin and inorganic tin, and the weight percentage of organic tin in the electrophoretic coating is 30ppm; the tin in the spray coating 3 The weight percentage is not more than 26ppm.

[0031] The composite coating method of the hard disk drive spindle motor magnet of the composite coating comprises the following process steps:

[0032] A. Coating electrophoretic coating on the surface of the motor magnet;

[0033] The weight percent of tin in the electrophoretic paint aqueous solution that adopts during electrophoresis is 28~45ppm, and wherein the weight percent of organotin is 6ppm, in order to satisfy the tin of ...

Embodiment 3

[0039] A composite coated hard disk drive spindle motor magnet, comprising a motor magnet substrate 1, coated with a composite coating on the substrate 1, the composite coating consists of an inner electrophoretic coating 2 and an outer spray coating 3 The weight percentage of tin in the electrophoretic coating 2 is 60~140ppm, wherein the tin is composed of organic tin and inorganic tin, and the weight percentage of organic tin in the electrophoretic coating is 20ppm; the tin in the spray coating 3 The weight percentage is not more than 20ppm.

[0040] The composite coating method of the hard disk drive spindle motor magnet of the composite coating comprises the following process steps:

[0041] A. Coating electrophoretic coating on the surface of the motor magnet;

[0042] The weight percent of tin in the electrophoretic paint aqueous solution that adopts during electrophoresis is 12~28ppm, and wherein the weight percent of organotin is 4ppm, in order to satisfy the tin of t...

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Abstract

The invention discloses a hard disk drive main shaft motor part with a composite coating and a method of the composite coating, which belongs to the technical field of motor parts with surface coating. The hard disk drive main shaft motor part comprises a motor part body and the composite coating which is coated on the motor part body, wherein, the composite coating consists of an inner electrophoretic coating and an outer spraying coating. The composite coating method of the invention comprises that: the motor part body is coated with the electrophoretic coating, and then the spraying coating is coated on the electrophoretic coating. Because of the increase of the tin content in the electrophoretic coating in the invention, the purity requirement for the electrophoretic coating is lowered, and no harm is generated to a magnetic storage media. Also, the composite coating of the invention can eliminate the naked hanging points at the surface of the motor parts and completely cover the motor part, thus having good integral anticorrosion property.

Description

technical field [0001] The invention relates to a surface-coated motor component and a coating method thereof. Background technique [0002] At present, the corrosion resistance of magnets or laminated iron cores or other components of hard disk drive spindle motors is mostly achieved by electrophoretic coating on their surfaces. The purpose of its coating is to use the shielding effect of the coating to isolate the substrate from the environment and prevent external corrosive media from contacting the metal substrate under the paint film to cause corrosion. [0003] It is generally believed that when a motor made of electrophoretic coated spindle motor components is used in a hard disk drive, the storage content in the hard disk will be lost due to the adhesion of tin and tin compounds released from the electrophoretic coating caused on the surface of magnetic storage media. Therefore, the industry controls the tin content in the coating to a small range. For example, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/00H02K15/00H02K15/02
CPCC25D5/48C25D3/30C25D13/12C25D13/00H02K7/14H02K1/02C25D7/10H02K1/27
Inventor 何金洲戴炎
Owner CHENGDU GALAXY MAGNETAB
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