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A coating resistant to molten zinc corrosion and wear and its preparation method

A melting-resistant and coating technology, applied in stainless steel parts, molten zinc corrosion and wear-resistant coatings and its preparation field, to achieve the effects of simple preparation process, reduced raw material costs, and low site and equipment requirements

Active Publication Date: 2021-07-09
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a coating resistant to corrosion and wear of molten zinc and its preparation method to solve the problem of liquid metal corrosion and wear of hot-end metal parts on the galvanizing production line and improve its service life

Method used

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  • A coating resistant to molten zinc corrosion and wear and its preparation method
  • A coating resistant to molten zinc corrosion and wear and its preparation method
  • A coating resistant to molten zinc corrosion and wear and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0034] In this embodiment, 304 austenitic stainless steel is used as the base, the size is 15mm×10mm×2mm, and the base is sandblasted to prepare the enamel coating. The preparation process is as follows:

[0035] (1) Enamel glaze formula:

[0036] The formula of enamel glaze is (mass fraction): silicon dioxide 42%, aluminum oxide 15%, boron oxide 8%, calcium oxide 16%, sodium oxide 2%, lithium oxide 3%, sodium fluorosilicate 7% %, calcium fluoride 7%.

[0037] (2) Preparation of enamel micropowder:

[0038] The above raw materials are ball-milled and mixed evenly, heated and smelted at 1500°C for 1 hour, quenched with water to obtain enamel glaze particles with specific components, and enamel micropowder with a particle size of less than 10 μm is prepared by planetary ball milling.

[0039] (3) Preparation of enamel slurry:

[0040] The enamel emulsion was prepared according to 1 g of enamel powder: 10 ml of absolute ethanol, and a uniformly dispersed enamel slurry was obtain...

Embodiment 2

[0045] The difference from Example 1 is that the enamel glaze formula is changed to (mass fraction): silicon dioxide 35%, aluminum oxide 15%, boron oxide 10%, calcium oxide 15%, potassium oxide 2%, oxide Lithium 3%, sodium fluorosilicate 10%, calcium fluoride 10%; wherein, the total content of silicon dioxide and aluminum oxide is less than 53%.

[0046] like figure 2 As shown in the figure, the surface of the prepared enamel coating has a macroscopic morphology, a large-scale glaze shrinkage area appears on the surface of the coating, and a ring-shaped crack is formed near the glaze shrinkage area.

Embodiment 3

[0048] The difference from the example is: (1) The enamel glaze formula is changed to (mass fraction): silicon dioxide 40%, aluminum oxide 15%, boron oxide 9%, calcium oxide 15%, sodium oxide 2% , Lithium oxide 2%, sodium fluorosilicate 10%, calcium fluoride 7%. (2) The sintering time of the enamel coating in a 1000 ℃ muffle furnace is 1 min.

[0049] The surface morphology of the prepared enamel coating and the figure 1 similar, see image 3 , The enamel coating is firmly combined with the stainless steel substrate, and the interface has no microscopic defects such as holes and cracks. Inside the enamel, a large number of fine white bright crystals can be seen. Coating thickness ~ 100 μm. X-ray analysis showed that the main precipitation of fine white crystals in the coating was CaF. 2 . like Figure 4 As shown, the X-ray diffraction peaks of the enamel are all CaF except the steamed bread peak near 25° (corresponding to the glass phase in the enamel). 2 diffraction p...

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Abstract

The invention relates to the technical field of high temperature protection, in particular to a coating resistant to molten zinc corrosion and wear and a preparation method thereof. The coating is an enamel coating with silicon dioxide as the main network forming agent, containing precipitated self-lubricating crystal calcium fluoride, and has the characteristics of corrosion resistance of zinc liquid, wear resistance, and strong binding force with the substrate. The wettability of the silicon-oxygen network in the coating with the zinc solution is poor, and no chemical reaction occurs, ensuring high corrosion resistance of the coating. At the same time, the calcium fluoride crystals precipitated in the coating can reduce the friction force suffered by the coating during the wear process and improve the service life of the coating. By optimizing the sintering process, the interface reaction is controlled, and the interface bonding force between the coating and the alloy matrix is ​​improved. The molten zinc corrosion and wear-resistant coating provided by the invention has simple preparation process, low cost, controllable thickness and surface roughness, and the thermal expansion coefficient can be adjusted in a wide range to better match the alloy substrate. The coating has zinc corrosion resistance , wear resistance, good combination with the matrix and other excellent comprehensive properties.

Description

Technical field: [0001] The invention relates to the technical field of high temperature protection, in particular to a coating resistant to corrosion and wear of molten zinc liquid and a preparation method thereof. . Background technique: [0002] Liquid metal corrosion and wear have always been one of the main reasons for the failure of key components in my country's metallurgical industry and nuclear energy industry, especially in the production of my country's iron and steel and non-ferrous metallurgy industries. Sinking rolls, stabilizing rolls and straightening roll systems in galvanizing production lines; injection punches and pressure chambers in aluminum alloy die casting; indenters and sub-sleeves in squeeze casting; thermocouple protective sleeves for continuous measurement of alloy melt temperature and many more. At high temperature, liquid metal undergoes physical and chemical reactions with metal parts through dissolution erosion, grain boundary corrosion, eros...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23D1/02C23D5/02C03C8/00
CPCC03C8/00C23D1/02C23D5/02
Inventor 陈明辉余中狄王金龙王群昌周文王福会
Owner NORTHEASTERN UNIV LIAONING
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