Water-based protective coating capable of adhering to high temperature billet and preparation method thereof

A protective coating, water-based technology, applied in the direction of sustainable manufacturing/processing, coating, climate sustainability, etc., to reduce heat dissipation, reduce oxidation loss, and improve descaling effect

Active Publication Date: 2014-10-22
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is suitable for high temperature protective coating technology and high temperatur

Method used

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  • Water-based protective coating capable of adhering to high temperature billet and preparation method thereof
  • Water-based protective coating capable of adhering to high temperature billet and preparation method thereof
  • Water-based protective coating capable of adhering to high temperature billet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] Example 1

[0030] Clay, magnesite, magnetite and steel slag are mixed according to the proportion of dry chemical components: 50wt% MgO, 15wt% Al 2 O 3 , 15wt%ZnO, 5wt%CaO, 5wt%SiO 2 , 2wt% Fe 2 O 3 , 3wt%Na 2 O, 2wt%K 2 O, 3wt% rare earth and other components, then ball mill to below 300 mesh; the density of the powder plus water is adjusted to 1.45g / cm 3 ; Sodium carboxydodecylbenzene sulfonate and sodium citrate were put into water at 0.2% and 0.5% by mass and stirred, and then ZnSO was added at 10% and 5% by mass respectively. 4 , ZnO is added to the previously prepared liquid, and stirred at 60° C. for 3 minutes to form a sol; adding 5% of the mass fraction of the sol to the above coating to obtain the coating. Spray the coating on the surface of Q235 steel billet at room temperature to form a light yellow protective coating. After exiting the heating furnace, the oxide scale is obviously thinned, the oxidation burn loss is reduced by 80%, and the coating can be peele...

Example Embodiment

[0031] Example 2

[0032] Clay, magnesite, diatomaceous earth, magnetite and Ni slag are mixed according to the dry chemical composition ratio: 40wt% MgO, 15wt% Al 2 O 3 , 20wt% ZnO, 8wt% CaO, 2wt% Fe 2 O 3 , 5wt% SiO 2 , 2wt% NiO, 3wt% Na 2 O, 2wt%K 2 O, 3wt% rare earth and other components, then ball mill to below 300 mesh; the density of the powder plus water is adjusted to 1.3g / cm 3 ; Put the sodium carboxymethyl cellulose and sodium citrate into the water according to the mass fraction of 0.2% and 0.5% respectively, and stir, and then add the ZnO and ZnSO according to the mass fraction of 10% and 5% respectively. 4 Add to the previously prepared liquid and stir at 70°C for 4 minutes to form a sol; add 4% of the sol mass fraction to the above coating, and finally add 2wt% of low-melting glass powder to obtain the coating. The coating was sprayed on the surface of Q235 steel billet at about 700°C to form a light yellow protective coating. After exiting the heating furnace, the ...

Example Embodiment

[0033] Example 3

[0034] Clay, magnesite, diatomaceous earth, magnetite and blast furnace slag are mixed according to the proportion of dry chemical components: 35wt% MgO, 12wt% Al 2 O 3 , 30wt%ZnO, 5wt%CaO, 3wt%Fe 2 O 3 , 5wt% SiO 2 , 5wt%Na 2 O, 2wt%K 2 O, 3wt% rare earth and other components, then ball mill to below 300 mesh; the density of the powder plus water is adjusted to 1.2g / cm 3 ; Put the sodium carboxymethyl cellulose and sodium citrate into the water according to the mass fraction of 0.2% and 0.5% respectively, and stir, and then respectively add the ZnO and ZnSO according to the mass fraction of 10%, 5%, and 5% 4 , Zn(OH) 2 Add to the previously prepared liquid and stir at 80°C for 5 minutes to form a sol; add 4% of the sol mass fraction to the above coating, and finally add 3wt% of low-melting glass powder to obtain the coating. The coating was sprayed on the surface of Q235 steel billet at about 1050°C to form a milky white protective coating. After exiting the he...

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Abstract

The invention relates to a water-based protective coating capable of adhering to a high temperature billet and a preparation method thereof, and belongs to the field of metal high-temperature protection. The water-based protective coating comprises main powder, 0-3wt% of an inorganic binder and 3-5wt% of a self-made additive. The main powder is prepared from natural raw materials such as clay, magnesite, diatomite, magnetite and metallurgy tailings. The self-made additive is a sol system comprising a surfactant and a Zn-containing component. The powder is subjected to ball milling so that particle sizes are less than 300 meshes, density of the slurry is adjusted to 1.2-1.5g/cm<3> and density is decreased with spray-coating temperature increasing. The water-based protective coating is suitable for spray-coating a billet having a temperature less than 1200 DEG C and heated in a heating furnace for 1-10h. The preparation method can realize adjustment and control of billet trace element distribution, does not change billet surface physicochemical characteristics and reduces a burning loss by more than 60%. The preparation method has active promotion effects of saving energy and reducing consumption in the metallurgy industry, improving steel quality and improving core competitiveness of a steel enterprise.

Description

technical field [0001] The invention relates to a preparation method of a water-based protective coating capable of adhering to a high-temperature steel billet, in particular to a preparation method of a water-based inorganic protective coating capable of adhering to a high-temperature steel billet at room temperature to 1200°C. It belongs to the field of metal high temperature coating protection. Background technique [0002] The heating of billet is an essential and important process before forging and rolling of steel. Increasing the temperature of billet is an important method to improve its plasticity. Since the steel parts are heated in the heating furnace for a long time, the surface of the steel parts and the oxygen in the atmosphere undergo a strong oxidation reaction at high temperature to form a large amount of oxide scales. It consumes energy, reduces the yield of steel billet, and causes the quality of steel after rolling to decrease, and the service life of he...

Claims

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Application Information

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IPC IPC(8): C09D1/00C09D7/12
CPCY02P20/10
Inventor 仉小猛魏连启叶树峰单欣陈运法
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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