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Preparation method of enamel coating

A coating and enamel technology, applied in the field of enamel coating preparation, can solve the problems of not very firm combination of coating and substrate, incomplete matching of thermal expansion coefficients, cracks, etc., so as to enhance the adhesion of bottom glaze and achieve smooth macroscopic surface. Smooth, crack-reducing effect

Inactive Publication Date: 2017-12-26
GUIZHOU XINGREN COUNTY RONGKAI HARDWARE ENAMEL PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the thermal expansion coefficients of the enamel coating and the metal substrate do not completely match, the combination of the coating and the substrate is not very firm, and cracks will appear after long-term use, and the cracking is serious, and even the enamel will fall off the metal substrate in pieces.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The present embodiment provides a kind of preparation method of enamel coating, comprises the following steps:

[0032] Step 1: pretreatment of the metal substrate;

[0033] Heat the metal substrate at 950°C for 20 minutes for decarburization, put the decarburized metal substrate in a hydrochloric acid solution with a concentration of 18%, pickle it until a clean metal surface is obtained, and then rinse it repeatedly with clean water to remove surface residues. acid solution, and finally place the metal substrate at 200°C for rapid drying and put it in a dry and pollution-free place for later use;

[0034] Step 2: preparation of enamel powder;

[0035] Parts by weight are 35 parts of silicon dioxide, 10 parts of diboron trioxide, 10 parts of aluminum oxide, 1 part of lithium oxide, 0.5 parts of potassium oxide, 1 part of vanadium, 1 part of calcium fluoride, 1 part of cobalt oxide, and 0.5 parts of nickel oxide. 1 part, 1 part of zinc oxide, 0.5 part of molybdenum tr...

Embodiment 2

[0042] The present embodiment provides a kind of preparation method of enamel coating, comprises the following steps:

[0043] Step 1: pretreatment of the metal substrate;

[0044]Heat the metal substrate at 960°C for 25 minutes for decarburization, put the decarburized metal substrate into 18% hydrochloric acid solution, pickle it until a clean metal surface is obtained, and then rinse it repeatedly with clean water to remove surface residues acid solution, and finally place the metal substrate at 220°C for quick drying and put it in a dry and pollution-free place for later use;

[0045] Step 2: preparation of enamel powder;

[0046] Parts by weight are 40 parts of silicon dioxide, 11 parts of diboron trioxide, 11 parts of aluminum oxide, 1.5 parts of lithium oxide, 0.7 parts of potassium oxide, 1.2 parts of vanadium, 1.2 parts of calcium fluoride, 1.2 parts of cobalt oxide, and 0.7 parts of nickel oxide. 1.2 parts of zinc oxide, 0.7 parts of molybdenum trioxide, 1.3 parts ...

Embodiment 3

[0053] The present embodiment provides a kind of preparation method of enamel coating, comprises the following steps:

[0054] Step 1: pretreatment of the metal substrate;

[0055] Heat the metal substrate at 965°C for 30 minutes for decarburization, put the decarburized metal substrate into a 19% hydrochloric acid solution, pickle it until a clean metal surface is obtained, and then rinse it repeatedly with clean water to remove surface residues. acid solution, and finally place the metal substrate at 250°C for quick drying and put it in a dry and pollution-free place for later use;

[0056] Step 2: preparation of enamel powder;

[0057] Parts by weight are 45 parts of silicon dioxide, 13 parts of diboron trioxide, 13 parts of aluminum oxide, 2 parts of lithium oxide, 1 part of potassium oxide, 1.5 parts of vanadium, 1.5 parts of calcium fluoride, 1.5 parts of cobalt oxide, and 1 part of nickel oxide. 1.5 parts of zinc oxide, 1 part of molybdenum trioxide, 2 parts of iron o...

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Abstract

The invention discloses a preparation method of an enamel coating. The method comprises the following steps that 1, a metal matrix is pretreated, wherein the metal matrix is subject to heat preservation for 20-40 min at the temperature ranging from 950 DEG C to 980 DEG C and then decarburized, the decarburized metal matrix is placed into an acid solution for acid pickling and taken out till a clean metal surface is obtained, clean water is used for repeated washing to remove surface residual acid liquor, and finally the metal matrix is placed at the temperature ranging 200 DEG C to 300 DEG C, rapidly dried and placed to a dry pollution-free place for standby application; 2, ceramic glaze powder is prepared; 3, ceramic slurry is prepared, and 4, enamelling and firing are carried out. According to the preparation method, the production process is simplified, the production efficiency is improved, an electrophoresis method is adopted for forming a uniform low-porosity porcelain enamel premade coating, the coating is uniform and compact in texture, oxide particles are small, grains are refined, the macro surface of the coating is flat, smooth and glossy, and cracking and block disengagement phenomena are effectively reduced.

Description

technical field [0001] The invention relates to the technical field of enamel coating preparation, in particular to a preparation method of an enamel coating. Background technique [0002] Enamel is an inorganic glass enamel coated and fired on the surface of a metal base. Enamel coating on the metal surface can prevent the metal from rusting, so that the metal will not form an oxide layer on the surface when it is heated and can resist the erosion of various liquids. Conventional enamel coatings are relatively thin, mainly to protect the base metal from high temperature corrosion; while the high temperature strength is mainly borne by the base metal itself. Since the base metal and protective coating can be designed separately, the metal parts with protective coating not only maintain the high temperature strength of the metal, but also have excellent high temperature corrosion resistance on the surface, especially suitable for occasions requiring high temperature corrosio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D13/02C23D5/00C03C8/06
CPCC25D13/02C03C8/06C23D5/00
Inventor 罗荣凯
Owner GUIZHOU XINGREN COUNTY RONGKAI HARDWARE ENAMEL PROD
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