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Hot-corrosion-resistant enamel coating and preparation method thereof

An enamel and coating technology, applied in the field of heat-resistant corrosion-resistant enamel coating and its preparation, can solve the problems of poor heat resistance and easy peeling off of the enamel coating, and achieve good metal wetting ability, good thermal stability and resistance to corrosion. Good oxidative and thermal corrosion effects

Pending Publication Date: 2018-09-11
PANZHIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The technical problem to be solved by the present invention is that the existing enamel coating is easy to fall off at high temperature and has poor heat resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0036] The preparation method of the above enamel bottom glaze includes the following steps: after weighing the raw materials according to the weight part, mixing them evenly, heating to 1300-1350° C. for 2-3 hours, melting in cold water, and drying at 100-130° C. for 20-30 minutes , to prepare the enamel bottom glaze.

[0037] In order to spray more evenly, when the present invention uses the above-mentioned enamel bottom glaze, the bottom glaze is prepared as an enamel bottom glaze slurry, which consists of 100 parts of the above-mentioned enamel bottom glaze, 15-19 parts of clay, and 2-2 parts of bentonite. 3 parts, 1 to 2 parts of magnesium sulfate are mixed, crushed to a particle size of -200 mesh ≥ 98%, and 20 to 22 parts are added and mixed evenly.

[0038] When the present invention prepares the slurry, after adding 1-2 parts of magnesium sulfate, Mg is formed in the slurry 2+ Charged colloidal particles increase the suspoemulsion of the slurry and the fluidity during...

Embodiment 1

[0052] Embodiment 1 prepares enamel coating with the inventive method

[0053] In parts by weight, SiO 2 30 parts, NaB 4 o 7 .4H 2 44 parts of O, NaNO 3 16 parts, Na 2 CO 3 15 copies, Li 2 CO 3 3.5 parts, 10 parts of fluorite, Na 2 SiF 6 2.5 parts, Na 3 AlF 6 6 parts, Na 4 P 2 o 7 .10H 2 3.5 parts of O, Co(NO 3 ) 2 8 parts and Ni(NO 3 ) 2 After mixing the 3 parts evenly, heat to 1300°C to melt for 2 hours, quench in cold water, and dry at 105°C for 20 minutes to obtain the enamel bottom glaze. Mix 100 parts of bottom glaze, 16 parts of clay, 3 parts of bentonite and 1.5 parts of magnesium sulfate, pulverize to a particle size of -200, add 20 parts of water and mix evenly to prepare enamel bottom glaze slurry.

[0054] Sandblast the surface of the enamel steel BTC245R sample, clean and decontaminate, and after drying, spray the enamel bottom glaze slurry on the surface with a thickness of 0.3-0.5mm. ;

[0055] Parts by mass: SiO 2 40 parts, NaB 4 ...

Embodiment 2

[0057] Embodiment 2 prepares enamel coating with the inventive method

[0058] In parts by weight, SiO 2 30 parts, NaB 4 o 7 .4H 2 44 parts of O, NaNO 3 16 parts, Na 2 CO 3 15 copies, Li 2 CO 3 3.5 parts, 10 parts of fluorite, Na 2 SiF 6 2.5 parts, Na 3 AlF 6 6 parts, Na 4 P 2 o 7 .10H 2 3.5 parts of O, Co(NO 3 ) 2 8 parts and Ni(NO 3 ) 2 After mixing the 3 parts evenly, heat to 1300°C to melt for 2 hours, quench in cold water, and dry at 105°C for 20 minutes to obtain the enamel bottom glaze. Mix 100 parts of bottom glaze, 16 parts of clay, 3 parts of bentonite and 1.5 parts of magnesium sulfate, pulverize to a particle size of -200, add 20 parts of water and mix evenly to prepare enamel bottom glaze slurry.

[0059] The surface of the low-carbon steel Q235 sample is sandblasted, cleaned and decontaminated, and after drying, it is sprayed on the surface with the enamel bottom glaze slurry, with a thickness of 0.3-0.5mm. After drying, it is fired at 9...

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Abstract

The invention belongs to the technical field of enamel materials and particularly relates to a hot-corrosion-resistant enamel coating and a preparation method thereof. For solving the problems that anenamel coating in the prior art is liable to strip off and is poor in heat resistance at high temperature, the invention provides the hot-corrosion-resistant enamel coating and the preparation methodthereof, wherein the method includes steps of: firing the surface of a metal base body to form a enamel base glaze layer, then spray-coating the surface of the enamel base glaze layer with enamel surface glaze slurry; drying the coating at 130-150 DEG C and enameling the coating at 900-950 DEG C for 12-15 min to form the hot-corrosion-resistant enamel coating belonging to the series of inert oxides. The coating has good fullness and very low oxygen migration rate, excellent thermal stability and anti-oxidizing performance, and is good in anti-acid / alkali and anti-corrosion performances.

Description

technical field [0001] The invention belongs to the technical field of enamel materials, and in particular relates to a heat-resistant corrosion enamel coating and a preparation method thereof. Background technique [0002] The hot-end components of thermal components in coal-fired and oil-fired devices such as turbines, steam turbines, gas turbines, and thermal power plant boilers generally work in harsh environments. These harsh environments can cause damage such as erosion, high temperature oxidation, and thermal corrosion. [0003] When high-temperature metal parts are in the working environment of 600 ° C ~ 1200 ° C, usually due to impurities contained in the fuel, such as sulfur, potassium, sodium, etc., SO 2 , SO 3 、H 2 S and other gases react with oxygen and NaCl in the air to accelerate the corrosion of materials, and sometimes even cause catastrophic accidents. When hot corrosion occurs, a layer of salt film will be deposited on the metal surface. After the sal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C8/14C23D5/02
CPCC03C8/14C23D5/02
Inventor 舒明勇尹海英
Owner PANZHIHUA UNIV
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