CN102517532A

CN102517532A - Preparation method of molten zinc corrosion resistant coating material for thermal spraying and coating material prepared by method

Info

Publication number: CN102517532A
Application number: CN2011104183968A
Authority: CN
Inventors: 于月光; 高峰; 任先京; 张乐; 沈婕; 李会谦
Original assignee: Beijing General Research Institute of Mining and Metallurgy
Current assignee: Beijing General Research Institute of Mining and Metallurgy
Priority date: 2011-12-14
Filing date: 2011-12-14
Publication date: 2012-06-27

Abstract

The invention provides a hot spraying zinc corrosion resistant coating material and a preparation method thereof, wherein the coating material comprises eta-phase tungsten carbide as a hard phase to replace WC which is easily decomposed at high temperature, and Fe₃Al is used as a binder phase to replace Co, and a thermal spraying method is adopted to prepare eta-phase tungsten carbide-Fe on the surface of the hot galvanizing sink roll or the shaft sleeve of the hot galvanizing sink roll₃And Al coating to obtain the target product. The hard phase eta-phase tungsten carbide adopted by the invention can effectively prevent zinc atoms from diffusing into the alloy, so as to play a role in resisting molten zinc liquid corrosion, and the eta-phase tungsten carbide is high-temperature resistant, is not easy to decompose and plays a good role in high-temperature wear resistance; binder phase Fe₃Al and Zn can form a Fe-Al-Zn ternary phase resisting the corrosion of zinc liquid, and the molten zinc corrosion resistance is superior to that of a sintered WC-Co coating.

Description

The coated material of a kind of preparation method of coated material of used for hot spraying resisting corrosion of molten zinc and the preparation of this method

Technical field

The present invention relates to a kind of coated material of preparation method and this method preparation of coated material of novel used for hot spraying resisting corrosion of molten zinc, the particularly a kind of novel used for hot spraying corrosive of anti-fused zinc metal carbide ceramic coating material.

Background technology

The pot galvanize technology is to prevent the most economical effective means of ferrous materials corrosive in physical environment, and the steel and iron member of handling through pot galvanize all has good solidity to corrosion in corrosive environments such as atmosphere, seawater, soil.At present, the band steel hot dip process unit of iron and steel enterprise mostly adopts the sinking roller arrangement, finds in the work; Be immersed in sinking roller and both sides axle sleeve thereof in the fused zinc aluminum melt fully; Receive the corrosion of zinc liquid intensive, directly influence the surface quality of steel plate galvanized, when serious; Worn out phenomenon also can take place in sinking roller both sides axle sleeve, can reduce production efficiency, the raising production cost of enterprise.

When the hot dip galvanizing process temperature was 460～650 ℃, the liquid Zn aluminum melt under this temperature had intensive corrodibility.The material of using on the Continuous Production Line of Galvanizing by Dipping comprises intermetallic compound, WC-Co coating and Fe-Al coatings etc. such as refractory metals such as Fe-Cr-Mn-Si and alloy, Fe-Al.But refractory metal and alloy material work under the pot galvanize condition some day after, or serious corrosion phenomenon takes place.Though WC-Co coating wear resistance is better, the work-ing life on the sinking roller is limited.And the anti-fused zinc corrosive nature of Fe-Al sprayed coating is better, but wear resistance is relatively poor, and the work-ing life on the sinking roller is limited.

Summary of the invention

The present invention provides a kind of preparation method of coated material of used for hot spraying resisting corrosion of molten zinc for solving short, the relatively poor problem of wear resistance in the work-ing life that exists in the existing hot dip galvanizing process, comprising:

With η phase wolfram varbide is that hard replaces the easy WC that decomposes under the high temperature mutually, with Fe ₃Al is bonding phase replaced C o, adopts the axle sleeve surface preparation η phase wolfram varbide-Fe of the method for thermospray at pot galvanize sinking roller or pot galvanize sinking roller ₃The Al coating makes target product.

The technique effect that technical scheme provided by the invention is brought:

(staple is Co to hard phase η phase ₃W ₃C and Co ₆W ₆C) wolfram varbide can stop zinc atom to the inner diffusion of alloy effectively, plays refractory and melts the liquid zinc corrosion effect, and η phase wolfram varbide is high temperature resistant, is difficult for decomposing, and plays good high-temperature wearable effect; Bonding phase Fe ₃Al can form the Fe-Al-Zn ternary phase of liquid zinc corrosion resistant with Zn, and anti-fused zinc corrosive nature is superior to sintering WC-Co coating, and the work-ing life of this coating under molten zinc corrosion condition was greater than 60 days.

Description of drawings

Fig. 1 is preparing method's the schematic flow sheet of the coated material of the used for hot spraying resisting corrosion of molten zinc that provides of the specific embodiment of the invention.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on embodiments of the invention, those of ordinary skills belong to protection scope of the present invention not making the every other embodiment that is obtained under the creative work prerequisite.

Embodiment of the present invention provides a kind of preparation method of coated material of used for hot spraying resisting corrosion of molten zinc, comprising: with η phase wolfram varbide is that hard replaces the easy WC that decomposes under the high temperature mutually, with Fe ₃Al is bonding phase replaced C o, adopts the axle sleeve surface preparation η phase wolfram varbide-Fe of the method for thermospray at pot galvanize sinking roller or pot galvanize sinking roller ₃The Al coating makes target product.

To combine the Figure of description specific embodiments of the invention to do to describe in detail further below, as shown in Figure 1, body material is the 316L stainless steel, and coated material is η phase wolfram varbide-Fe ₃Al, equipment adopts supersonic velocity flame plating equipment.

Concrete preparation process is following:

Step 1 is with 20 kilograms of η phase tungsten-carbide powders and 3.6 kilograms of Fe ₃Al (contains CeO ₂) the powder agglomeration granulation, sintering goes out η phase wolfram varbide-Fe then ₃Al piece material, broken, air classification is prepared η phase wolfram varbide-Fe ₃The Al powder, powder size is at 25～45 μ m>=92%, flowability≤25s/50g, loose density>=3.0g/cm ³, particle shape is spherical or subsphaeroidal;

Step 2, with 316L stainless steel axle sleeve surface clean, sandblasting;

Step 3 adopts heat spraying method to prepare η phase wolfram varbide-Fe ₃The Al coating, the volume(tric)fraction that coat-thickness 0.15～0.3mm, η account for coating mutually is 60%, coating porosity is 0.9%.

In step 3, adopt supersonic flame spraying method to prepare coating, coating is fine and close, can reduce zinc atom effectively through the diffusion of hole to alloy inside, the life-span of further improving coated material.

(staple is Co to the preparing method's of the coated material of the used for hot spraying resisting corrosion of molten zinc that this embodiment provides hard phase η phase ₃W ₃C and Co ₆W ₆C) wolfram varbide can stop zinc atom to the inner diffusion of alloy effectively, plays refractory and melts the liquid zinc corrosion effect, and η phase wolfram varbide is high temperature resistant, is difficult for decomposing, and plays good high-temperature wearable effect; Bonding phase Fe ₃Al can form the Fe-Al-Zn ternary phase of liquid zinc corrosion resistant with Zn, and anti-fused zinc corrosive nature is superior to sintering WC-Co coating, and the work-ing life of this coating under molten zinc corrosion condition was greater than 60 days.

The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.

Claims

1. the preparation method of the coated material of a used for hot spraying resisting corrosion of molten zinc is characterized in that, comprising:

2. the preparation method of the coated material of used for hot spraying resisting corrosion of molten zinc according to claim 1 is characterized in that, the coated material weight percent that said η phase wolfram varbide accounts for said resisting corrosion of molten zinc is 65%～92%, said Fe ₃The coated material weight percent that Al accounts for said resisting corrosion of molten zinc is 8%～35%.

3. the preparation method of the coated material of used for hot spraying resisting corrosion of molten zinc according to claim 1 is characterized in that, said heat spraying method is a supersonic flame spraying method.

4. the preparation method of the coated material of used for hot spraying resisting corrosion of molten zinc according to claim 1 is characterized in that, said η phase wolfram varbide-Fe ₃The granularity of Al coating is 20 μ m～180 μ m, flowability≤30s/50g, loose density>=2.7g/cm ³, particle shape is spherical or subsphaeroidal.

5. the coated material of the resisting corrosion of molten zinc of the method for any claim of claim 1 to 4 preparation is characterized in that the coated material of said resisting corrosion of molten zinc is by η phase wolfram varbide and Fe ₃Al forms.