CN112342544A - Low-temperature acid and alkali resistant cast iron enamel processing technology and coating formula - Google Patents
Low-temperature acid and alkali resistant cast iron enamel processing technology and coating formula Download PDFInfo
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- CN112342544A CN112342544A CN202011114632.2A CN202011114632A CN112342544A CN 112342544 A CN112342544 A CN 112342544A CN 202011114632 A CN202011114632 A CN 202011114632A CN 112342544 A CN112342544 A CN 112342544A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23D—ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS
- C23D5/00—Coating with enamels or vitreous layers
- C23D5/02—Coating with enamels or vitreous layers by wet methods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
- B22D31/002—Cleaning, working on castings
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C8/00—Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D5/00—Heat treatments of cast-iron
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23D—ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS
- C23D7/00—Treating the coatings, e.g. drying before burning
Abstract
The invention discloses a low-temperature acid and alkali resistant cast iron enamel processing technology and a coating formula, which comprises the following steps: casting, step two: repairing the sand holes, and step three: treating iron particles and bonded sand, and step four: annealing, step five: preparing glaze slip and glaze powder, and the sixth step: enamel of the base glaze, step seven: and (6) inspecting and packaging a finished product. The cast iron enamel prepared by the invention has higher acid and alkali resistance, the surface of the enamel is not polished, and after an impact test, the outer enamel layer is not damaged within 24 hours, so that the cast iron enamel has good strength and compactness.
Description
Technical Field
The invention relates to the technical field of cast iron enamel processing, in particular to a low-temperature acid and alkali resistant cast iron enamel processing technology and a coating formula.
Background
The cast iron enamel is an enamel using cast iron as a base blank, and because the cast iron blank is thick and has high carbon content, the firing temperature of the base glaze is required to be low, and the firing range is required to be wide. The glaze for mixing raw materials (silica sand, feldspar, borax, clay, etc.) with common frits or the refractory semi-molten glaze has a lower melting temperature than that of the glaze for enamel of steel plate, and contains lead-containing glaze, stibium-containing opal glaze, acid-resistant glaze, etc.
The wet process flow of enamel in the prior art comprises the steps of making an enamel plate blank, punching, polishing surface treatment, enameling, drying, firing and framing, the process is simple, a high-temperature resistant stove or an earthenware pot, a frying pan and the like are manufactured by adopting a traditional enamel method, the firing temperature is high, the process performance is poor, the porcelain tightening phenomenon can occur for a long time, the appearance effect is influenced after the porcelain tightening, the use of products is influenced, and iron rust is easily formed at the porcelain tightening position particularly, so that the food health of people is influenced.
Therefore, it is necessary to invent a low-temperature acid and alkali resistant cast iron enamel processing technology and a coating formula to solve the problems.
Disclosure of Invention
The invention aims to provide a processing technology and a coating formula of low-temperature acid and alkali resistant cast iron enamel, the cast iron enamel prepared by the invention has high acid and alkali resistant performance, the surface of the enamel is not polished, and after an impact test, the outer enamel layer is not damaged within 24 hours, and the cast iron enamel has good strength and compactness.
In order to achieve the above purpose, the invention provides the following technical scheme: a low-temperature acid and alkali resistant cast iron enamel processing technology comprises the following steps: a casting, which is made of grey cast iron with the content of each component element of 3.4-3.7% of carbon, 0.4-0.6% of manganese, 2.3-2.5% of silicon, 0.2-0.4% of phosphorus and 0.01-0.1% of sulfur;
step two: repairing the sand holes, namely filling the sand holes smaller than 2mm with the semi-dry ground coat or repairing the sand holes between 2mm and 5mm with carbon dioxide shielded welding;
step three: treating iron particles and bonded sand, grinding the iron particles by using a grinding wheel, flattening exposed bubbles of a casting by using carbon dioxide arc welding, and refining and smoothening molding sand, burrs and the like adhered to the surface of the casting;
step four: annealing, namely horizontally and stably placing the casting into heating equipment, and continuously heating for 15-20 minutes at the temperature of 750-;
step five: preparing glaze slip and glaze powder, namely grinding the glaze slip by adopting a small-capacity ball mill;
step six: enamels of base and cover glazes;
step seven: and (6) inspecting and packaging a finished product.
The invention also provides a formula of the low-temperature acid and alkali resistant cast iron enamel coating, which comprises 46-56 parts of quartz, 8-10 parts of feldspar, 18-22 parts of borax, 18-20 parts of boric acid, 6-10 parts of clay, 0.5-1 part of cobalt oxide, 5-8 parts of red lead, 1-2 parts of magnesium oxide, 4-6 parts of magnesium carbonate, 17-19 parts of boron trioxide, 43-47 parts of silicon dioxide, 3-5 parts of ferric oxide and 25-30 parts of water.
Preferably, the overglaze comprises 20-22 parts of quartz, 14-17 parts of feldspar powder, 32-35 parts of borax, 3-5 parts of sodium nitrate, 15-18 parts of cobalt dioxide, 25-30 parts of calcium oxide, 8-12 parts of sodium carbonate, 5-7 parts of sodium fluosilicate, 2-3 parts of monopotassium phosphate, 48-50 parts of water and 3-6 parts of enamel pigment.
Preferably, the step one: the enamel of the base glaze is sprayed by adopting a wet enameling method, so that the base glaze is uniformly sprayed on the bottom of the casting, and the spraying thickness is 80-100 mu m;
step two: drying the ground coat, and continuously heating at the temperature of 220-240 ℃ for 25-35 minutes;
step three: the ground glaze is inspected and repaired, the repair spraying of local missing spraying and the repair repairing of powder layer damage are needed, the damaged part of the small-area powder layer can be lightly brushed by dipping ground glaze slurry with a writing brush, and the drying is carried out again and thoroughly;
step four: firing the ground coat, and continuously heating at the temperature of 760-780 ℃ for 12-15 minutes;
step five: the surface glaze enamel is sprayed by a wet enameling method, so that the surface glaze is uniformly sprayed on the surface of the casting, and the primary spraying thickness is 140-;
step six: drying the overglaze, continuously heating for 30-40 minutes at the temperature of 190-220 ℃ to ensure that the upward edge of the vessel without the overglaze is hung and fastened, and the upward edge and the horizontal edge of the vessel are hung and dried at the bottom or other hidden parts of the vessel needing the overglaze;
step seven: inspecting and repairing the overglaze, namely scraping the overglaze dry powder on the upper edge of the vessel by using the toothless side of a steel saw blade, and wiping the overglaze dry powder falling on the inner part and the outer bottom of the vessel;
step eight: sintering the overglaze, continuously heating for 5-8 minutes at the temperature of 730-750 ℃, then taking out and spraying the surface of the overglaze for 2-4 times to ensure that the overglaze is uniformly sprayed on the surface of the casting, wherein the thickness of the primary spraying is 170 mu m, and finally continuously heating for 5-8 minutes at the temperature of 730-750 ℃.
In the technical scheme, the invention provides the following technical effects and advantages:
the cast iron enamel prepared by the invention has higher acid and alkali resistance, the surface of the enamel is not polished, and after an impact test, the outer enamel layer is not damaged within 24 hours, so that the cast iron enamel has good strength and compactness.
Detailed Description
The present invention will be described in further detail below in order to enable those skilled in the art to better understand the technical solution of the present invention.
The invention provides a low-temperature acid and alkali resistant cast iron enamel processing technology, which comprises the following steps: a casting, which is made of grey cast iron with the content of each component element of 3.4-3.7% of carbon, 0.4-0.6% of manganese, 2.3-2.5% of silicon, 0.2-0.4% of phosphorus and 0.01-0.1% of sulfur;
step two: repairing the sand holes, namely filling the sand holes smaller than 2mm with the semi-dry ground coat or repairing the sand holes between 2mm and 5mm with carbon dioxide shielded welding;
step three: treating iron particles and bonded sand, grinding the iron particles by using a grinding wheel, flattening exposed bubbles of a casting by using carbon dioxide arc welding, and refining and smoothening molding sand, burrs and the like adhered to the surface of the casting;
step four: annealing, namely horizontally and stably placing the casting into heating equipment, and continuously heating for 15-20 minutes at the temperature of 750-;
step five: preparing glaze slip and glaze powder, namely grinding the glaze slip by adopting a small-capacity ball mill;
step six: enamels of base and cover glazes;
step seven: and (6) inspecting and packaging a finished product.
The invention also provides a formula of the low-temperature acid and alkali resistant cast iron enamel coating, which comprises 46-56 parts of quartz, 8-10 parts of feldspar, 18-22 parts of borax, 18-20 parts of boric acid, 6-10 parts of clay, 0.5-1 part of cobalt oxide, 5-8 parts of red lead, 1-2 parts of magnesium oxide, 4-6 parts of magnesium carbonate, 17-19 parts of boron trioxide, 43-47 parts of silicon dioxide, 3-5 parts of ferric oxide and 25-30 parts of water.
The overglaze comprises, by weight, 20-22 parts of quartz, 14-17 parts of feldspar powder, 32-35 parts of borax, 3-5 parts of sodium nitrate, 15-18 parts of cobalt dioxide, 25-30 parts of calcium oxide, 8-12 parts of sodium carbonate, 5-7 parts of sodium fluosilicate, 2-3 parts of monopotassium phosphate, 48-50 parts of water and 3-6 parts of enamel pigments.
The method comprises the following steps: the enamel of the base glaze is sprayed by adopting a wet enameling method, so that the base glaze is uniformly sprayed on the bottom of the casting, and the spraying thickness is 80-100 mu m;
step two: drying the ground coat, and continuously heating at the temperature of 220-240 ℃ for 25-35 minutes;
step three: the ground glaze is inspected and repaired, the repair spraying of local missing spraying and the repair repairing of powder layer damage are needed, the damaged part of the small-area powder layer can be lightly brushed by dipping ground glaze slurry with a writing brush, and the drying is carried out again and thoroughly;
step four: firing the ground coat, and continuously heating at the temperature of 760-780 ℃ for 12-15 minutes;
step five: the surface glaze enamel is sprayed by a wet enameling method, so that the surface glaze is uniformly sprayed on the surface of the casting, and the primary spraying thickness is 140-;
step six: drying the overglaze, continuously heating for 30-40 minutes at the temperature of 190-220 ℃ to ensure that the upward edge of the vessel without the overglaze is hung and fastened, and the upward edge and the horizontal edge of the vessel are hung and dried at the bottom or other hidden parts of the vessel needing the overglaze;
step seven: inspecting and repairing the overglaze, namely scraping the overglaze dry powder on the upper edge of the vessel by using the toothless side of a steel saw blade, and wiping the overglaze dry powder falling on the inner part and the outer bottom of the vessel;
step eight: sintering the overglaze, continuously heating for 5-8 minutes at the temperature of 730-750 ℃, then taking out and spraying the surface of the overglaze for 2-4 times to ensure that the overglaze is uniformly sprayed on the surface of the casting, wherein the thickness of the primary spraying is 170 mu m, and finally continuously heating for 5-8 minutes at the temperature of 730-750 ℃.
Example 1:
the invention provides a low-temperature acid and alkali resistant cast iron enamel processing technology, which comprises the following steps: a casting, which is made of grey cast iron with the content of each component element of 3.4-3.7% of carbon, 0.4-0.6% of manganese, 2.3-2.5% of silicon, 0.2-0.4% of phosphorus and 0.01-0.1% of sulfur;
step two: repairing the sand holes, namely filling the sand holes smaller than 2mm with the semi-dry ground coat or repairing the sand holes between 2mm and 5mm with carbon dioxide shielded welding;
step three: treating iron particles and bonded sand, grinding the iron particles by using a grinding wheel, flattening exposed bubbles of a casting by using carbon dioxide arc welding, and refining and smoothening molding sand, burrs and the like adhered to the surface of the casting;
step four: annealing, namely horizontally and stably placing the casting into heating equipment, and continuously heating for 15 minutes at the temperature of 750 ℃;
step five: preparing glaze slip and glaze powder, namely grinding the glaze slip by adopting a small-capacity ball mill;
step six: enamels of base and cover glazes;
step seven: and (6) inspecting and packaging a finished product.
The invention also provides a formula of the low-temperature acid and alkali resistant cast iron enamel coating, which comprises a base coat and a cover coat, and comprises the following steps: the enamel of the base glaze adopts a wet enameling method to spray the base glaze enamel to ensure that the base glaze is uniformly sprayed on the bottom of the casting, and the spraying thickness is 100 mu m
Step two: drying the ground glaze, and continuously heating for 25 minutes at the temperature of 220 ℃;
step three: the ground glaze is inspected and repaired, the repair spraying of local missing spraying and the repair repairing of powder layer damage are needed, the damaged part of the small-area powder layer can be lightly brushed by dipping ground glaze slurry with a writing brush, and the drying is carried out again and thoroughly;
step four: firing the ground coat, and continuously heating at the temperature of 760 ℃ for 12 minutes;
step five: the surface glaze enamel is sprayed by a wet enameling method, so that the surface glaze is uniformly sprayed on the surface of the casting, and the spraying thickness of one time is 140 mu m;
step six: drying the overglaze, continuously heating for 30 minutes at the temperature of 190 ℃, ensuring that the edge of the ware is upward and the variety without the overglaze is hung on the shelf and is dried, and the edge of the ware is upward and is the upward and horizontal direction and the variety with the overglaze is hung on the bottom or other hidden parts of the shelf;
step seven: inspecting and repairing the overglaze, namely scraping the overglaze dry powder on the upper edge of the vessel by using the toothless side of a steel saw blade, and wiping the overglaze dry powder falling on the inner part and the outer bottom of the vessel;
step eight: sintering the overglaze, continuously heating for 5 minutes at 730 ℃, then taking out and spraying the surface of the overglaze for 2 times to ensure that the overglaze is uniformly sprayed on the surface of the casting, wherein the thickness of the primary spraying is 140-.
The cast iron enamel prepared in the embodiment has high acid and alkali resistance, the surface of the enamel is not subjected to tarnishing, and the outer enamel layer is slightly damaged within 24 hours after an impact test.
Example 2:
the invention provides a low-temperature acid and alkali resistant cast iron enamel processing technology, which comprises the following steps: a casting, which is made of grey cast iron with the content of each component element of 3.4-3.7% of carbon, 0.4-0.6% of manganese, 2.3-2.5% of silicon, 0.2-0.4% of phosphorus and 0.01-0.1% of sulfur;
step two: repairing the sand holes, namely filling the sand holes smaller than 2mm with the semi-dry ground coat or repairing the sand holes between 2mm and 5mm with carbon dioxide shielded welding;
step three: treating iron particles and bonded sand, grinding the iron particles by using a grinding wheel, flattening exposed bubbles of a casting by using carbon dioxide arc welding, and refining and smoothening molding sand, burrs and the like adhered to the surface of the casting;
step four: annealing, namely horizontally and stably placing the casting into heating equipment, and continuously heating for 15 minutes at the temperature of 750 ℃;
step five: preparing glaze slip and glaze powder, namely grinding the glaze slip by adopting a small-capacity ball mill;
step six: enamels of base and cover glazes;
step seven: and (6) inspecting and packaging a finished product.
The invention also provides a formula of the low-temperature acid and alkali resistant cast iron enamel coating, which comprises a base coat and a cover coat, and comprises the following steps: the enamel of the base glaze adopts a wet enameling method to spray the base glaze enamel to ensure that the base glaze is uniformly sprayed on the bottom of the casting, and the spraying thickness is 100 mu m
Step two: drying the ground glaze, and continuously heating for 25 minutes at the temperature of 220 ℃;
step three: the ground glaze is inspected and repaired, the repair spraying of local missing spraying and the repair repairing of powder layer damage are needed, the damaged part of the small-area powder layer can be lightly brushed by dipping ground glaze slurry with a writing brush, and the drying is carried out again and thoroughly;
step four: firing the ground coat, and continuously heating at the temperature of 760 ℃ for 12 minutes;
step five: the surface glaze enamel is sprayed by a wet enameling method, so that the surface glaze is uniformly sprayed on the surface of the casting, and the spraying thickness of one time is 140 mu m;
step six: drying the overglaze, continuously heating for 30 minutes at the temperature of 190 ℃, ensuring that the edge of the ware is upward and the variety without the overglaze is hung on the shelf and is dried, and the edge of the ware is upward and is the upward and horizontal direction and the variety with the overglaze is hung on the bottom or other hidden parts of the shelf;
step seven: inspecting and repairing the overglaze, namely scraping the overglaze dry powder on the upper edge of the vessel by using the toothless side of a steel saw blade, and wiping the overglaze dry powder falling on the inner part and the outer bottom of the vessel;
step eight: sintering the overglaze, continuously heating for 5 minutes at the temperature of 730 ℃, then taking out and spraying the overglaze for 3 times on the surface of the casting to ensure that the overglaze is uniformly sprayed on the surface of the casting, wherein the thickness of the primary spraying is 140-. In comparative example 1, the cast iron enamel prepared in this example has the same acid and alkali resistance, the surface of the enamel is not glazed, and after an impact test, the outer enamel layer is not damaged within 24 hours.
Example 3:
the invention provides a low-temperature acid and alkali resistant cast iron enamel processing technology, which comprises the following steps: a casting, which is made of grey cast iron with the content of each component element of 3.4-3.7% of carbon, 0.4-0.6% of manganese, 2.3-2.5% of silicon, 0.2-0.4% of phosphorus and 0.01-0.1% of sulfur;
step two: repairing the sand holes, namely filling the sand holes smaller than 2mm with the semi-dry ground coat or repairing the sand holes between 2mm and 5mm with carbon dioxide shielded welding;
step three: treating iron particles and bonded sand, grinding the iron particles by using a grinding wheel, flattening exposed bubbles of a casting by using carbon dioxide arc welding, and refining and smoothening molding sand, burrs and the like adhered to the surface of the casting;
step four: annealing, namely horizontally and stably placing the casting into heating equipment, and continuously heating for 15 minutes at the temperature of 750 ℃;
step five: preparing glaze slip and glaze powder, namely grinding the glaze slip by adopting a small-capacity ball mill;
step six: enamels of base and cover glazes;
step seven: and (6) inspecting and packaging a finished product.
The invention also provides a formula of the low-temperature acid and alkali resistant cast iron enamel coating, which comprises a base coat and a cover coat, and comprises the following steps: the enamel of the base glaze adopts a wet enameling method to spray the base glaze enamel to ensure that the base glaze is uniformly sprayed on the bottom of the casting, and the spraying thickness is 100 mu m
Step two: drying the ground glaze, and continuously heating for 25 minutes at the temperature of 220 ℃;
step three: the ground glaze is inspected and repaired, the repair spraying of local missing spraying and the repair repairing of powder layer damage are needed, the damaged part of the small-area powder layer can be lightly brushed by dipping ground glaze slurry with a writing brush, and the drying is carried out again and thoroughly;
step four: firing the ground coat, and continuously heating at the temperature of 760 ℃ for 12 minutes;
step five: the surface glaze enamel is sprayed by a wet enameling method, so that the surface glaze is uniformly sprayed on the surface of the casting, and the spraying thickness of one time is 140 mu m;
step six: drying the overglaze, continuously heating for 30 minutes at the temperature of 190 ℃, ensuring that the edge of the ware is upward and the variety without the overglaze is hung on the shelf and is dried, and the edge of the ware is upward and is the upward and horizontal direction and the variety with the overglaze is hung on the bottom or other hidden parts of the shelf;
step seven: inspecting and repairing the overglaze, namely scraping the overglaze dry powder on the upper edge of the vessel by using the toothless side of a steel saw blade, and wiping the overglaze dry powder falling on the inner part and the outer bottom of the vessel;
step eight: sintering the overglaze, continuously heating for 5 minutes at 730 ℃, then taking out and spraying the surface of the overglaze for 4 times to ensure that the overglaze is uniformly sprayed on the surface of the casting, wherein the thickness of the primary spraying is 140-.
Comparing examples 1 and 2, the cast iron enamel prepared in the example has the same acid and alkali resistance, the surface of the enamel is not glazed, and after the impact test, the outer ceramic layer is not damaged and the inner ceramic layer is slightly damaged after 24 hours.
The following table is obtained according to examples 1 to 3:
from the above table, it can be seen that the cast iron enamel prepared in example 2 has high acid and alkali resistance, the surface of the enamel is not glazed, and after an impact test, the outer enamel layer is not damaged within 24 hours.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Therefore, the above description is illustrative in nature and should not be construed as limiting the scope of the invention, which is defined by the appended claims, and any modifications, equivalents, improvements and the like, which come within the spirit and scope of the invention are intended to be embraced therein.
Claims (4)
1. A low-temperature acid and alkali resistant cast iron enamel processing technology is characterized in that:
the method comprises the following steps: a casting, which is made of grey cast iron with the content of each component element of 3.4-3.7% of carbon, 0.4-0.6% of manganese, 2.3-2.5% of silicon, 0.2-0.4% of phosphorus and 0.01-0.1% of sulfur;
step two: repairing the sand holes, namely filling the sand holes smaller than 2mm with the semi-dry ground coat or repairing the sand holes between 2mm and 5mm with carbon dioxide shielded welding;
step three: treating iron particles and bonded sand, grinding the iron particles by using a grinding wheel, flattening exposed bubbles of a casting by using carbon dioxide arc welding, and refining and smoothening molding sand, burrs and the like adhered to the surface of the casting;
step four: annealing, namely horizontally and stably placing the casting into heating equipment, and continuously heating for 15-20 minutes at the temperature of 750-;
step five: preparing glaze slip and glaze powder, namely grinding the glaze slip by adopting a small-capacity ball mill;
step six: enamel of base coat and overglaze.
Step seven: and (6) inspecting and packaging a finished product.
2. The low-temperature acid and alkali resistant cast iron enamel coating formula of claim 1, comprising a ground coat and a cover coat, and is characterized in that: the ground glaze comprises, by weight, 46-56 parts of quartz, 8-10 parts of feldspar, 18-22 parts of borax, 18-20 parts of boric acid, 6-10 parts of clay, 0.5-1 part of cobalt oxide, 5-8 parts of red lead, 1-2 parts of magnesium oxide, 4-6 parts of magnesium carbonate, 17-19 parts of diboron trioxide, 43-47 parts of silicon dioxide, 3-5 parts of ferric oxide and 25-30 parts of water.
3. The formula of the low-temperature acid and alkali resistant cast iron enamel coating as claimed in claim 2, wherein: the overglaze comprises, by weight, 20-22 parts of quartz, 14-17 parts of feldspar powder, 32-35 parts of borax, 3-5 parts of sodium nitrate, 15-18 parts of cobalt dioxide, 25-30 parts of calcium oxide, 8-12 parts of sodium carbonate, 5-7 parts of sodium fluosilicate, 2-3 parts of monopotassium phosphate, 48-50 parts of water and 3-6 parts of enamel pigments.
4. The formula of the low-temperature acid and alkali resistant cast iron enamel coating as claimed in claim 3, wherein the formula comprises the following components in percentage by weight:
the method comprises the following steps: the enamel of the base glaze is sprayed by adopting a wet enameling method, so that the base glaze is uniformly sprayed on the bottom of the casting, and the spraying thickness is 80-100 mu m;
step two: drying the ground coat, and continuously heating at the temperature of 220-240 ℃ for 25-35 minutes;
step three: the ground glaze is inspected and repaired, the repair spraying of local missing spraying and the repair repairing of powder layer damage are needed, the damaged part of the small-area powder layer can be lightly brushed by dipping ground glaze slurry with a writing brush, and the drying is carried out again and thoroughly;
step four: firing the ground coat, and continuously heating at the temperature of 760-780 ℃ for 12-15 minutes;
step five: the surface glaze enamel is sprayed by a wet enameling method, so that the surface glaze is uniformly sprayed on the surface of the casting, and the primary spraying thickness is 140-;
step six: drying the overglaze, continuously heating for 30-40 minutes at the temperature of 190-220 ℃ to ensure that the upward edge of the vessel without the overglaze is hung and fastened, and the upward edge and the horizontal edge of the vessel are hung and dried at the bottom or other hidden parts of the vessel needing the overglaze;
step seven: inspecting and repairing the overglaze, namely scraping the overglaze dry powder on the upper edge of the vessel by using the toothless side of a steel saw blade, and wiping the overglaze dry powder falling on the inner part and the outer bottom of the vessel;
step eight: sintering the overglaze, continuously heating for 5-8 minutes at the temperature of 730-750 ℃, then taking out and spraying the surface of the overglaze for 2-4 times to ensure that the overglaze is uniformly sprayed on the surface of the casting, wherein the thickness of the primary spraying is 170 mu m, and finally continuously heating for 5-8 minutes at the temperature of 730-750 ℃.
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| CN113754282A (en) * | 2021-10-13 | 2021-12-07 | 福建省德化威航艺品有限公司 | Metal enamel glaze with milky glaze and preparation method thereof |
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