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Multilayer composite ceramic coating for hot dip galvanizing and preparation method thereof

A multi-layer composite and ceramic coating technology, which is applied in coatings, chemical instruments and methods, metal material coating technology, etc., can solve problems such as poor mechanical properties and thermal conductivity, poor liquid zinc corrosion resistance, and low material life , to achieve good thermal conductivity and thermal shock resistance, good resistance to liquid zinc corrosion, and high thermal shock resistance

Inactive Publication Date: 2016-02-03
天津市卧龙冶金设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a multi-layer composite ceramic coating for hot-dip galvanizing and its preparation method. The organic combination of oxide ceramics and ceramic glass overcomes the poor resistance to liquid zinc corrosion of existing overall metal materials, the poor mechanical properties and thermal conductivity of existing inorganic non-metallic ceramic materials, and the high through-porosity of existing coating materials. The disadvantage of low life of materials corroded by liquid zinc

Method used

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  • Multilayer composite ceramic coating for hot dip galvanizing and preparation method thereof
  • Multilayer composite ceramic coating for hot dip galvanizing and preparation method thereof
  • Multilayer composite ceramic coating for hot dip galvanizing and preparation method thereof

Examples

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Embodiment 1

[0066] This embodiment is used for the multi-layer composite ceramic coating of hot-dip galvanizing. The base material is Q235 carbon steel, and the microcrystalline self-fluxing alloy layer of Fe-Al is used as the bottom layer. The thickness of the bottom layer is 100 μm, and Al- Fe 2 O 3 The ceramic-based nanocrystalline ceramic-metal composite layer n-(Fe 1-x Al x )(Fe x Al 2-x )O 4 -Fe-Al 2 O 3 It is an intermediate transition layer, the thickness of the intermediate transition layer is 400μm, and the ZrO sealed with ceramic glass 2 The oxide ceramic layer is the working layer, and the thickness of the working layer is 200μm, which constitutes a multilayer composite ceramic coating for hot-dip galvanizing, wherein the underlying alloy has a microcrystalline structure, and the ceramic-metal complex phase transition The layer is a nanocrystalline structure, and the ceramic glass sealing oxide ceramic working layer has a microcrystalline + amorphous structure. The multilayer com...

Embodiment 2

[0094] Except that Q195 plain carbon steel is used as the base material of the multilayer composite ceramic coating, everything else is the same as in Example 1.

[0095] Picture 9 This is the SEM photograph of the cross section of the multilayer composite ceramic coating for hot-dip galvanizing of this embodiment. It can be seen from the figure that the multilayer composite ceramic coating is composed of Fe-Al layer alloy bottom layer, complex phase iron aluminum spinel (Fe 1-x Al x )(Fe x Al 2-x )O 4 -Fe-Al 2 O 3 Intermediate transition layer, ZrO sealed by ceramic glass sealing layer 2 The ceramic working layer is composed of a good combination of sublayers inside the coating.

[0096] Picture 10 This is the XRD spectrum of the bottom layer of the Fe-Al microcrystalline self-fluxing alloy layer of this embodiment. It can be seen from the XRD spectrum that the bottom layer is made of Fe 2 Al 5 , FeAl 2 And AlFe phase composition. These phases are all Fe-Al intermetallic compou...

Embodiment 3

[0106] Except that Q235-B plain carbon steel is used as the base material of the multilayer composite ceramic coating, everything else is the same as in Example 1.

[0107] Figure 16 This is the SEM photograph of the cross section of the multi-layer composite ceramic coating used for hot-dip galvanizing of this embodiment. It can be seen from this figure that the inner bottom layer, the intermediate transition layer, and the working layer sealed by the sealing layer on the substrate are well bonded among the sublayers.

[0108] Figure 17 This is the XRD spectrum of the bottom layer of the Fe-Al microcrystalline self-fluxing alloy layer of this embodiment. It can be seen from the XRD spectrum that the bottom layer is made of Al, which is resistant to liquid zinc corrosion, high temperature oxidation, and good thermal conductivity. 5 Fe 2 , FeAl 2 And AlFe phase composition. These phases are all Fe-Al intermetallic compounds, which not only have certain liquid zinc corrosion resis...

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Abstract

The invention discloses a multilayer composite ceramic coating used for hot-dip zinc galvanization, and a preparation method of the multilayer composite ceramic coating, and relates to plating of metal materials. A base material of the multilayer composite ceramic coating is plain carbon steel containing 0.05-0.22 wt% of carbon. A nano crystal self-fluxing alloy layer of Fe-Al, Ni-Al, CoCrArAlY or NiCrAlY is used as a bottom player. A ceramic-based nano ceramic-metal complex phase layer synthesized by an aluminothermy self-reaction of Al-Fe2O3 or Al-Cr2O3 is used as a middle transition player. An oxide ceramic layer, holes of which are sealed by ceramic-glass, of ZrO2, Al2O3, Cr2O3 or Al2O3-ZrO2 is used as a working player. Accordingly, the multilayer composite ceramic coating used for the hot-dip zinc galvanization, which has a microcrystalline-nanocrystalline-amorphous crystalline multilevel structure, is prepared. The preparation method includes painting the prepared raw materials in order by using a plasma spraying method. The multilayer composite ceramic coating and the preparation method overcome disadvantages of poor corrosion resistance to liquid zinc, poor mechanical performances, poor thermal conductivity or short service lifetime of materials at present.

Description

Technical field [0001] The technical scheme of the invention relates to the plating of metal materials, in particular to a multilayer composite ceramic coating for hot-dip galvanizing and a preparation method thereof. Background technique [0002] At the temperature of 460~650℃ for hot-dip galvanizing, liquid zinc is strongly corrosive to almost all metals. This kind of corrosion not only causes the equipment life to be low, the energy consumption is high, and the abnormal zinc consumption increases, but also the production efficiency is reduced. The problem of liquid zinc corrosion-resistant materials has always been the bottleneck of increasing the life of hot-dip galvanizing equipment, reducing energy consumption, reducing abnormal zinc consumption, improving production efficiency and reducing costs. Take the zinc pot material that consumes the most in engineering as an example. At present, low-carbon steel and cast iron are widely used as zinc pot materials in engineering. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/04B32B9/04C23C4/04
Inventor 阎殿然董艳春陈学广张建新杨勇褚振华
Owner 天津市卧龙冶金设备有限公司
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