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Composite coating and preparation method and application thereof

A composite coating and coating layer technology, applied in coatings, electrolytic coatings, anti-corrosion coatings, etc., can solve the problems of harsh working environment, disappearance, corrosion-prone magnetic properties, etc., to improve neutral salt spray resistance, Good corrosion resistance effect

Active Publication Date: 2021-01-29
安徽名杰磁业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, NdFeB has a porous and multi-phase structure, which is very prone to corrosion in the natural environment, resulting in the decline or even disappearance of magnetic properties. Regardless of sintered NdFeB magnets or bonded NdFeB magnets, their poor corrosion resistance is also an important consideration in industrial applications. body segment
In addition, due to the continuous expansion of the application field of bonded NdFeB, the working environment in some fields is very harsh, and a single coating can no longer meet the requirements. It is necessary to combine multiple protection methods and coatings to form a composite coating to meet the corrosion resistance in harsh environments. performance

Method used

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  • Composite coating and preparation method and application thereof
  • Composite coating and preparation method and application thereof
  • Composite coating and preparation method and application thereof

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preparation example Construction

[0037] see Figure 1 to Figure 3 . Another aspect of the present invention also provides a method for preparing the composite coating as described above, the method at least including the steps of S1-S4:

[0038] S1: providing a base;

[0039] S2: forming a first paint layer on the substrate;

[0040] S3: forming a second paint layer on the first paint layer;

[0041] S4: forming a third paint layer on the second paint layer to obtain the composite coating;

[0042] Wherein, the first coating layer is an electrophoretic layer, the second coating layer includes a material composed of nanoparticles, epoxy resin, amino resin, and the third coating layer includes epoxy resin, polyurethane resin, novolac resin Or one or more combinations of aldehyde and ketone resins.

[0043] In step S1, the substrate 100 can be a metal product such as an NdFeB magnet, and the substrate 100 can also be pretreated before the composite coating 200 is formed, and the pretreatment can include but...

Embodiment 1

[0052] (1) Chamfering and polishing: use mechanical vibration grinding and rolling chamfering to polish the surface of the bonded NdFeB magnetic ring, and the final magnetic ring size: outer diameter 18.8mm×inner diameter 15.8mm×thickness 2.5mm .

[0053] (2) Ultrasonic cleaning: Put the chamfered and polished magnet into an ultrasonic cleaning machine for cleaning.

[0054] (3) Surface phosphating: put the cleaned permanent magnet into the phosphating solution for surface phosphating treatment, the phosphating adopts medium temperature phosphating, the temperature is 50-75°C, and the treatment time is 5-30min.

[0055] (4) The first coating layer: electrophoresis epoxy resin coating on the surface of the magnetic ring, the electrophoresis voltage is 180V, the electrophoresis time is 160s, the drying temperature is 180°C, the drying time is 30min, and the coating thickness is 50μm.

[0056] (5) The second coating layer: apply the slurry of the second coating layer on the surf...

Embodiment 2

[0060] (1) Chamfer grinding: The surface of the bonded NdFeB magnet is polished by mechanical vibration grinding and rolling chamfering, and the final magnetic ring size is: outer diameter 22mm×inner diameter 19.7mm×thickness 12.3mm.

[0061] (2) Ultrasonic cleaning: put the chamfered magnet into an ultrasonic cleaning machine for cleaning;

[0062] (3) Surface phosphating: put the cleaned permanent magnet into the phosphating solution for surface phosphating treatment, the phosphating adopts medium temperature phosphating, the temperature is 50-75°C, and the treatment time is 5-30min.

[0063] (4) Metal base layer: use spraying process to prepare ZnAl metal coating on the surface of the magnet after treatment; the specific process is: first spray the front of the magnet, spraying amount 26g / 30s, atomization pressure 0.3-0.5Mpa, drying after spraying , the drying temperature is 120°C, and the drying time is 15 minutes. After the cooled product is turned over, the other side i...

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Abstract

The invention provides a composite coating as well as a preparation method and application thereof. The composite coating at least comprises a first coating layer, a second coating layer and a third coating layer, the second coating layer is positioned on the first coating layer; the third coating layer is positioned on the second coating layer; the first coating layer is an electrophoresis layer,the second coating layer comprises a substance composed of nano particles, epoxy resin and amino resin, and the third coating layer comprises a substance composed of one or more of epoxy resin, polyurethane resin, linear phenolic resin or aldehyde ketone resin. The composite coating provided by the invention can greatly improve the neutral salt spray resistance of metal products.

Description

technical field [0001] The invention relates to the field of anticorrosion on the surface of metal products, in particular to a composite coating and its preparation method and application. Background technique [0002] The corrosion resistance of metal products has always been a key factor restricting the performance of metal products in various aspects such as life. Since its inception in 1983, NdFeB rare earth permanent magnet material (NdFeB) has the characteristics of light weight, small size, and excellent performance, making the miniaturization, light weight, and thinning of instruments, notebook computers, and automotive motors a reality. , driving the progress of the entire industry. However, NdFeB has a porous and multi-phase structure, which is very prone to corrosion in the natural environment, resulting in the decline or even disappearance of magnetic properties. Regardless of sintered NdFeB magnets or bonded NdFeB magnets, their poor corrosion resistance is al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/44C09D5/08C09D163/00C09D7/61C09D7/63C09D161/20C09D7/20B05D1/36B05D7/24C25D13/06
CPCC09D5/443C09D5/4457C09D5/08C09D163/00C09D7/61C09D7/63C09D7/20B05D7/54B05D7/24C25D13/04C08L61/20C08K3/36C08K3/04C08K5/05C08K13/02
Inventor 陈海龙姚民
Owner 安徽名杰磁业科技有限公司
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