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Composite coating resistant to liquid molten zinc corrosion and preparation method thereof

A technology of composite coating and molten zinc, which is applied in the direction of coating, molten spraying, metal material coating technology, etc., can solve the problems of short service life, achieve excellent corrosion resistance, prevent thermal oxidation, and not easy to crack.

Inactive Publication Date: 2017-12-22
武钢集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the above defects or improvement needs of the prior art, the invention provides a composite coating resistant to liquid molten zinc corrosion and a preparation method thereof, the purpose of which is to prepare a composite coating of CrMnWNbB / NiCrCoAlY by plasma spraying on the surface of a metal substrate, To reduce the corrosion rate of the parts on the galvanizing production line that are in direct contact with the high-temperature molten zinc solution The technical problem of short service life caused by molten zinc corrosion

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  • Composite coating resistant to liquid molten zinc corrosion and preparation method thereof
  • Composite coating resistant to liquid molten zinc corrosion and preparation method thereof
  • Composite coating resistant to liquid molten zinc corrosion and preparation method thereof

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Embodiment 1

[0029] The embodiment of the present invention is used to prepare a composite coating of CrMnWNbB / NiCrCoAlY. In the composite coating, each component in the alloy coating and the mass percentage content of the component are: 18% Cr, 9% Mn, 2% W, 2% Nb, 2% B, 0.05% S and the rest of Fe, each component in the primer layer and the mass percentage content of the component are 2.8% Co, 15.5% Cr, 5.0% Al, 0.5% Y 2 o 3 , the remainder of Ni and impurity elements, and the thickness of the primer layer is 20 μm, and the thickness of the alloy coating is 170 μm.

[0030] The preparation method comprises the following steps:

[0031] S1: The alloy coating powder is prepared by the atomization method, the melting temperature of the alloy is 1550°C, and the melting pressure is 3.0MPa. The entire preparation process of the atomization method is carried out under a nitrogen atmosphere, and then sieved with a stainless steel sieve to obtain a particle size of about 35 μm~ 60μm alloy coated ...

Embodiment 2

[0039] The embodiment of the present invention is used to prepare a composite coating of CrMnWNbB / NiCrCoAlY. In the composite coating, each component in the alloy coating and the mass percentage content of the component are: 21% Cr, 9% Mn, 2% W, 2% Nb, 3% B, 0.05% S and the rest of Fe, each component in the primer layer and the mass percentage content of the component are 2.2% Co, 17.5% Cr, 4.0% Al, 0.6% Y 2 o 3 , the remainder of Ni and impurity elements, and the thickness of the primer layer is 22 μm, and the thickness of the alloy coating is 180 μm.

[0040] The preparation method comprises the following steps:

[0041] S1: The alloy coating powder is prepared by the atomization method, the alloy melting temperature is 1550° C., and the melting pressure is 3.0 MPa. The powder preparation by the atomization method is carried out under an argon atmosphere. Then sieve with a stainless steel sieve to obtain an alloy coating powder with a particle size of about 40 μm to 65 μm....

Embodiment 3

[0053] The embodiment of the present invention is used to prepare a CrMnWNbB / NiCrCoAlY composite coating on the shaft sleeve substrate. In the composite coating, each component in the alloy coating and the mass percentage content of the component are: 25% Cr, 9% Mn, 2 %W, 2%Nb, 4%B, 0.05%S and the rest of Fe, each component in the primer layer and the mass percentage content of the component are 2.5%Co, 16.5%Cr, 6.0%Al, 0.8%Y 2 o 3 , the remainder of Ni and impurity elements, and the thickness of the primer layer is 18 μm, and the thickness of the alloy coating is 150 μm.

[0054] S1: The whole preparation process of the atomization method is carried out under a nitrogen atmosphere, and then sieved with a stainless steel sieve to obtain an alloy coating powder with a particle size of about 35 μm to 80 μm, and sieved to obtain an alloy powder with a particle size of about 35 μm to 80 μm, and then use The alloy powder with a particle diameter of 35 μm to 80 μm is subjected to s...

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Abstract

The invention discloses a composite coating resistant to liquid molten zinc corrosion, which belongs to the field of surface modification of metal materials. The coating includes a primer layer coated on the surface of a substrate and an alloy coating layer coated on the primer layer. The alloy coating also contains elements Cr, Mn, W, Nb, B, S and the balance of Fe, and the primer layer also contains elements Co, Cr, Al, Ni, Y, O and unavoidable impurity elements. The invention also discloses a method for preparing the composite coating, which includes: preparing the alloy coating powder by atomization, sandblasting the surface of the substrate, preparing the primer by thermal spraying, and preparing the composite coating by thermal spraying on the primer. alloy coating to obtain a composite coating. The method of the invention can reduce the corrosion rate of parts on the hot-dip galvanizing production line by zinc liquid, and prolong their service life.

Description

technical field [0001] The invention belongs to the field of surface modification of metal materials, and more specifically relates to a composite coating resistant to liquid molten zinc corrosion and a preparation method thereof. Background technique [0002] Continuous hot-dip galvanizing is a process in which a layer of zinc is coated on the surface of strip steel to prevent corrosion. This process has high efficiency and low cost, and is widely used in industries such as automobiles, home appliances, and construction. During the hot-dip galvanizing process, various components on the galvanizing line are immersed in the high-temperature molten zinc liquid in the zinc pot, and the high-temperature molten zinc liquid has certain corrosiveness, which will damage the sinking roll, stabilizing roll, correcting roll, Parts such as shaft sleeves, bearing bushes and furnace noses are corroded. In the process of continuous hot-dip galvanizing of strip steel, there is wear between...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/06C23C4/134C22C38/38C22C38/22C22C38/26C22C38/32C22C19/05C22C32/00
Inventor 索进平方宣伟杨芃张雨泉王毅严肃聂国念王炳如
Owner 武钢集团有限公司