CN213767510U - Anticorrosive coating and metal product - Google Patents

Abstract

The utility model provides an anticorrosive coating and a metal product, wherein the anticorrosive coating comprises a protective film layer; the zinc-aluminum base layer is positioned on the protective film layer; the electrophoresis layer is positioned on the zinc-aluminum base layer; the first coating layer is positioned on the electrophoresis layer; the second coating layer is positioned on the first coating layer; the inside lamellar structure that has of zinc-aluminum basic unit, the thickness of zinc-aluminum basic unit is 10 mu m ~ 20 mu m, the utility model discloses improvement neodymium iron boron tombarthite permanent magnet's that can be by a wide margin resistant neutral salt fog performance.

Description

Anticorrosive coating and metal product

Technical Field

The utility model relates to a powder metallurgy metal anticorrosion field, specificly relate to an anticorrosive coating, metal product.

Background

Since 1983, neodymium iron boron rare earth permanent magnet material (NdFeB) has the characteristics of light weight, small volume, excellent performance and the like, so that the miniaturization, light weight and thinning of instruments, notebook computers, automobile motors and other equipment become reality, and the progress of the whole industry is promoted. However, NdFeB has a porous and multi-phase structure, and is very easy to corrode in a natural environment, so that magnetic properties are degraded or even disappear. In addition, as the application field of the bonded NdFeB is continuously expanded, the working environment of some fields is very poor, a single coating cannot meet the requirement, and a plurality of protection methods and coatings are required to be combined to form an anticorrosive coating to meet the anticorrosive performance under the severe environment.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's defect, provide a neodymium iron boron tombarthite permanent magnet's anticorrosive coating for solve among the prior art problem that neodymium iron boron tombarthite permanent magnet material corrosion resistance is poor.

In order to achieve the above objects and other objects, the present invention is achieved by including: the anticorrosive coating comprises: a protective film layer; the zinc-aluminum base layer is positioned on the protective film layer; the electrophoresis layer is positioned on the zinc-aluminum base layer; the first coating layer is positioned on the electrophoresis layer; the second coating layer is positioned on the first coating layer; the zinc-aluminum base layer is internally provided with a layered structure, and the thickness of the zinc-aluminum base layer is 10-20 mu m.

In one embodiment, the surface of the zinc-aluminum base layer has a fish scale-like structure.

In one embodiment, the thickness of the electrophoretic layer is 40 μm to 60 μm.

In one embodiment, the thickness of the first coating layer is 10 μm to 20 μm.

In one embodiment, the thickness of the second coating layer is 10 μm to 20 μm.

In one embodiment, the thickness of the anticorrosion layer is 70-120 μm.

In one embodiment, the coating is an epoxy coating.

In one embodiment, the electrophoretic layer is an epoxy electrophoretic layer.

In one embodiment, the protective film is a phosphating film or a passivation film.

The utility model discloses another aspect still provides one kind and includes as above the metal product of anticorrosive coating.

The utility model provides a pair of anticorrosive coating structure is fine and close, has obvious advantage to the anticorrosive of powder metallurgy metal field, improvement neodymium iron boron tombarthite permanent magnet's that can by a wide margin resistant neutral salt fog performance to make neodymium iron boron tombarthite permanent magnet can use in the comparatively abominable body border weather of body border. The utility model discloses when the coating thickness is at 70 ~ 120 mu m, guaranteeing that the coating interface is level and smooth, no fracture can be so that the resistant neutral salt fog time of bonding neodymium iron boron magnet can reach 1800h, has better corrosion resisting property.

Drawings

Fig. 1 shows a schematic structural diagram of the present invention.

Fig. 2 shows a scanning electron microscope image of the corrosion protection layer sample of the present invention.

Fig. 3 shows a scanning electron microscope image of the anticorrosive coating comparative sample of the present invention.

Fig. 4 shows a scanning electron microscope image of the upper surface of the zinc-aluminum base layer in the comparative sample of the corrosion protection layer of the present invention.

Reference numeral 100 in fig. 1-a metal substrate, 200-an anticorrosive layer, 201-a protective film layer, 202-a zinc-aluminum base layer, 203-an electrophoretic layer, 204-a first paint layer, 205-a second paint layer.

Detailed Description

Please refer to fig. 1 to 4. The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

Please refer to fig. 1 to 4. The utility model provides an anticorrosive coating 200 at first, anticorrosive coating 200 can be the anticorrosive coating 200 of an organic coating and the compound formation of metal material, anticorrosive coating 200 can be attached to a metal substrate 100, in an embodiment, metal substrate 100 can be neodymium iron boron tombarthite permanent magnet material, for example bonding neodymium iron boron magnet, in an embodiment, can be bonding neodymium iron boron magnetic ring, the external diameter of bonding neodymium iron boron magnetic ring can be 21.990 ~ 22.050mm, and the internal diameter can be 19.700 ~ 19.760mm, highly can be 12.25 ~ 12.3mm, and the suppression density of magnetic ring can be more than or equal to 6.0g/cm3, and circularity can be less than or equal to 0.03mm, and the concentricity can be less than or equal to 0.03mm, and full-size CPK can be more than or equal to 1.33.

Please refer to fig. 1 to 4. The anti-corrosion layer 200 may include a protective film layer 201, the protective film may be formed by phosphorizing or passivating the metal substrate 100, the phosphorizing or passivating may enable the protective film layer 201 to be formed on the substrate 100 to block the holes on the metal substrate 100, and the protective film is a very thin film formed by chemical reaction, and is attached to the metal substrate 100 in the scanning electron microscope image, and is difficult to distinguish, and the thickness of the protective film is negligible.

Please refer to fig. 1 to 4. The anti-corrosion layer 200 may further include a zinc-aluminum base layer 202, the zinc-aluminum base layer 202 may be directly attached to the protective film 201 by spraying, the zinc-aluminum may be configured according to a weight ratio of (1-5): 1, and in an embodiment, the thickness of the zinc-aluminum base layer 202 may be 10 μm to 20 μm, for example, 15 μm, 16 μm. As shown in fig. 3, the interior of the zinc-aluminum base layer 202 may be a layered structure that prevents the formation of corrosion channels. As shown in fig. 4, the surface of the zinc-aluminum base layer 202 may be in the shape of a fish scale, and the bionic structure in the shape of a fish scale may prevent the formation of corrosion channels, and may also enhance the adhesion compactness of the electrophoretic layer 203 disposed above the zinc-aluminum base layer 201.

Referring to fig. 1 to 4, the anti-corrosion layer 200 may further include an electrophoretic layer 203, the electrophoretic layer 203 may be formed by coating a certain electrophoretic slurry on the zinc-aluminum base layer 202 through electrophoresis, the main component of the electrophoretic slurry may be epoxy resin, the thickness of the electrophoretic layer 203 may be 40 to 60 μm, for example, 50 μm, and in an embodiment, the electrophoretic slurry may include the following raw materials and weight parts: 10-25% of epoxy resin, 10-12% of 2-butoxyethanol, 1-10% of 2-butyltin oxide, 1-10% of carbon black and 43-45% of water. The electrophoresis can be carried out by adopting a full-automatic intelligent stepping cathode electrophoresis coating line device, the voltage value of the electrophoresis can be 160-220V, such as 180V and 200V, and the electrophoresis time can be 120-200 s, such as 160s and 180 s. The pH value of the electrophoresis slurry can be 5.6-6.4, the conductivity can be 1200-1900 [ mu ] s/cm, and as can be seen from FIG. 2, the anti-corrosion layer 200 is uniform, flat and compact, has good anti-corrosion performance, and the boundary between the electrophoresis layer 203 and other layers is fuzzy, which indicates that the anti-corrosion layer with better compactness can be obtained by adopting electrophoresis than direct spraying, so that the anti-corrosion layer 200 has excellent anti-corrosion performance.

As shown in fig. 1 to 4, the anti-corrosion layer 200 may further include a first paint layer 204, the first paint layer 204 may be located on the electrophoretic layer 203, and the thickness of the first paint layer 204 may be 10 μm to 20 μm, for example, 15 μm. The first coating layer 204 may be formed by diluting a certain first coating layer slurry and spraying the diluted first coating layer slurry onto the electrophoretic layer 202, where the first coating layer slurry may include a substance composed of nanoparticles, epoxy resin, and amino resin, the nanoparticles may include any one or more of silica, ceria, titania, and graphite, the nanoparticles may have a particle size of 30-300nm, and in one embodiment, the weight ratio of the nanoparticles, epoxy resin, and amino resin may be (1-5): (50-60): (10-15).

As shown in fig. 1 to 4, in an embodiment, the first coating layer slurry may further include a solvent and an auxiliary agent, the solvent may be any one or more of xylene, isobutanol, and methyl isobutanol, in an embodiment, the solvent may be xylene, isobutanol, and methyl isobutanol at a weight ratio of (5-10): (1-5): 1-5), and the auxiliary agent may include carbon black.

As shown in fig. 1 to 4, the anticorrosive layer 200 may further include a second coating layer 205, the second coating layer 205 may be located on the first coating layer 204, the thickness of the second coating layer 205 may be 10 μm to 20 μm, for example, 15 μm, the second coating layer 205 may also be formed by spraying a certain second coating layer slurry onto the first coating layer 204, the second coating layer slurry may include any one or more of epoxy resin, polyurethane, phenol novolac resin, or aldehyde ketone resin, the viscosity of the second coating layer slurry may be 7.8 to 15s, and controlling the viscosity within the above range may enable the coating to be uniform without sagging, orange peel, and the like.

As shown in fig. 1 to 2, the total thickness of the anti-corrosion layer 200 of the present invention may be 70 to 120 μm, for example, 90 μm, and limiting the thickness of the anti-corrosion layer 200 within the above disclosed range may enable the metal substrate 100 to have better corrosion resistance. Furthermore, the utility model discloses a will anticorrosive coating 200's thickness is set for in certain extent, both can play anticorrosive effect, can ensure the holistic hardness of anticorrosive coating again.

As shown in fig. 1 to fig. 4, another aspect of the present invention further provides a metal product, where the metal product may include the corrosion protection layer 200, and the corrosion protection layer 200 may be used in the field of corrosion protection of metal products, especially in the field of corrosion protection of powder metallurgy metals with many pores, and in an embodiment, may be used in corrosion protection of bonded NdFeB magnets, and the metal product prepared by using the corrosion protection layer 200 of the present invention may be used in the field of automobile motors, etc., and has good corrosion protection performance.

As shown in fig. 1 to 4, the present invention is further explained by the specific process of making the corrosion protection layer.

In one embodiment, the preparation of the corrosion protection layer comprises the following steps:

(I) chamfer polishing: carrying out surface polishing treatment on the bonded neodymium iron boron magnetic ring by adopting mechanical vibration grinding and barreling chamfer, and finally, sizing the magnetic ring: the outer diameter is 18.8mm, the inner diameter is 15.8mm, and the thickness is 2.5 mm.

(II) ultrasonic cleaning: and putting the magnet after chamfering and polishing into an ultrasonic cleaning machine for cleaning.

(III) protective film layer: and putting the cleaned permanent magnet into phosphating solution for surface phosphating to form a protective film layer, wherein medium-temperature phosphating is adopted for phosphating.

(IV) zinc-aluminum base layer: the zinc-aluminum base layer is prepared on the surface of the phosphatized magnet by adopting a spraying process, and the specific process comprises the following steps: the front surface of the magnet is firstly sprayed and then dried. After the cooled product is turned over, the other surface is sprayed by the same coating and process, and the thickness of the zinc-aluminum base layer is 10 mu m.

(V) electrophoretic layer: and (3) electrophoretic resin coating is carried out on the zinc-aluminum base layer, and the thickness of the electrophoretic layer is 50 micrometers.

(sixth), first dope layer: coating a coating on the surface of the electrophoresis layer to form a first coating layer, and the specific process comprises the following steps: firstly, the front surface of the magnet is sprayed with the coating twice and then dried. And continuously spraying the coating for two times and then drying, wherein the thickness of the first coating layer is 16.8 mu m.

(seventh), second dope layer: coating a second coating layer slurry on the surface of the closed first coating layer to form a second coating layer, wherein the second coating layer slurry is prepared from modified polyurethane epoxy resin, and the specific process comprises the following steps: and spraying the coating twice on the front surface of the magnet, drying, continuously spraying the coating twice, and drying, wherein the thickness of the second coating layer is 16.9 mu m.

And sequentially carrying out the spraying process on the reverse side of the bonded neodymium iron boron magnetic ring, finally drying and curing to obtain an anticorrosive coating sample, wherein the thickness of the anticorrosive coating is about 93.7 mu m, and carrying out a neutral salt spray test on the anticorrosive coating sample under the test conditions shown in the table 1, wherein the neutral salt spray test result of the sample is 1800 hours and no embroidery point exists.

The anticorrosive coating comparison sample is prepared by the same preparation process, the comparison sample does not have an electrophoresis layer relative to the sample, the neutral salt spray test result of the comparison sample is 1500 hours, no embroidery point exists, and the electrophoresis layer has a promotion effect on the anticorrosive performance of the anticorrosive coating.

Table 1 neutral salt spray test conditions

Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value. The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (10)

1. An anticorrosive layer, characterized in that the anticorrosive layer comprises:

a protective film layer;

the zinc-aluminum base layer is positioned on the protective film layer;

the electrophoresis layer is positioned on the zinc-aluminum base layer;

the first coating layer is positioned on the electrophoresis layer;

the second coating layer is positioned on the first coating layer;

the zinc-aluminum base layer is internally provided with a layered structure, and the thickness of the zinc-aluminum base layer is 10-20 mu m.

2. The corrosion protection layer of claim 1, wherein: the surface of the zinc-aluminum base layer is provided with a fish scale-shaped structure.

3. The corrosion protection layer of claim 1, wherein: the thickness of the electrophoresis layer is 40-60 mu m.

4. The corrosion protection layer of claim 1, wherein: the thickness of the first coating layer is 10-20 mu m.

5. The corrosion protection layer of claim 1, wherein: the thickness of the second coating layer is 10-20 μm.

6. The corrosion protection layer of claim 1, wherein: the thickness of the anticorrosive layer is 70-120 mu m.

7. The corrosion protection layer of claim 1, wherein: the coating is an epoxy resin coating.

8. The corrosion protection layer of claim 1, wherein: the electrophoresis layer is an epoxy resin electrophoresis layer.

9. The corrosion protection layer of claim 1, wherein: the protective film is a phosphating film or a passivation film.

10. A metal article comprising a corrosion protective layer as claimed in any one of claims 1 to 9.

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