Composite coating as well as preparation method and application thereof

A composite coating and coating layer technology, applied in coatings, anti-corrosion coatings, epoxy resin coatings, etc., can solve the problems of harsh working environment, disappearance, decline, etc., to improve neutral salt spray resistance, good durability The effect of corrosion performance

Pending Publication Date: 2021-01-08
HEFEI UNIV OF TECH
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  • 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 as well as preparation method and application thereof
  • Composite coating as well as preparation method and application thereof
  • Composite coating as well as preparation method and application thereof

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preparation example Construction

[0030] 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:

[0031] S1: providing a base;

[0032] S2: forming a metal base layer on the substrate;

[0033] S3: forming a first paint layer on the metal base layer;

[0034] S4: forming a second paint layer on the first paint layer to obtain the composite coating;

[0035] Wherein, the metal base layer includes one or more combinations of zinc, aluminum, and nickel; the first paint layer includes a substance composed of nanoparticles, epoxy resin, and amino resin, and the second paint layer includes a ring Oxygen resins, polyurethane resins, novolak resins or aldehyde and ketone resins are composed of one or more combinations.

[0036] In step S1, the substrate 100 can be metal products such as NdFeB magnets, and the substrate 100 can also be pretreated before forming the composite c...

Embodiment 1

[0045] (1) Chamfer grinding: The surface of the bonded NdFeB magnet is polished by mechanical vibration grinding and rolling chamfering, and the final magnet size is: outer diameter 22mm×inner diameter 19.7mm×thickness 12.3mm.

[0046] (2) Ultrasonic cleaning: Put the chamfered and polished magnet into an ultrasonic cleaning machine for cleaning.

[0047] (3) Surface phosphating: put the cleaned 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 5-30 minutes.

[0048] (4), metal base layer: adopt spraying process to prepare ZnAl metal base layer on the surface of the magnet after treatment, the specific process is: first spray the front of the magnet, the spray amount is 26g / 30s, the atomization pressure is 0.3-0.5Mpa, dry after spraying, The drying temperature is 120°C, and the drying time is 15 minutes. After the cooled product is turned over, th...

Embodiment 2

[0053] (1) Chamfering and polishing: The surface of the bonded NdFeB magnet is polished by mechanical vibration grinding and rolling chamfering. The final magnetic ring size is: outer diameter 18.8mm×inner diameter 15.8mm×thickness 2.5mm.

[0054] (2) Ultrasonic cleaning: Put the chamfered and polished magnet into an ultrasonic cleaning machine for cleaning.

[0055] (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.

[0056] (4), metal base layer: adopt spraying process to prepare ZnAl metal base layer 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...

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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 metal base layer, a first coating layer and a second coating layer, wherein the first coating layer is positioned on the metal base layer; the second coating layer is positioned on the first coating layer; the metal base layer comprises one or a combinationof more of zinc, aluminum and nickel; and the first coating layer comprises a substance composed of nanoparticles, epoxy resin and amino resin, the second coating layer comprises a substance composedof one or more of epoxy resin, polyurethane resin, linear phenolic resin or aldehyde ketone resin, and the composite coating can greatly improve the neutral salt spray resistance of a metal product.

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): B05D7/14B05D1/36B05D3/02C09D163/00C09D175/04C09D161/06C09D161/02C09D5/08C09D7/61
CPCB05D7/14B05D1/36B05D7/54B05D3/0254C09D163/00C09D175/04C09D161/06C09D161/02C09D5/08C09D7/61B05D2504/00B05D2320/00B05D2301/00B05D2503/00B05D2518/00C08L61/20C08K3/36C08K3/04C08L75/04C08L61/06C08L61/02B05D2420/01B05D2420/02
Inventor 杨友文任瑞冬蒋楠王永乐杨雷刘继广
Owner HEFEI UNIV OF TECH
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