CN113045912A - High-temperature anti-oxidation coating for heat treatment of stainless steel workpiece and preparation method thereof - Google Patents
High-temperature anti-oxidation coating for heat treatment of stainless steel workpiece and preparation method thereof Download PDFInfo
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- CN113045912A CN113045912A CN202110288735.9A CN202110288735A CN113045912A CN 113045912 A CN113045912 A CN 113045912A CN 202110288735 A CN202110288735 A CN 202110288735A CN 113045912 A CN113045912 A CN 113045912A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/20—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for coatings strippable as coherent films, e.g. temporary coatings strippable as coherent films
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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Abstract
The invention relates to a high-temperature anti-oxidation coating for heat treatment of a stainless steel workpiece and a preparation method thereof. The coating powder is prepared by mixing the following components: 30-45% of montmorillonite, 1-5% of iron oxyhydroxide, 20-30% of brucite, 1-5% of calcium ferrite and 30-35% of complex magnesium aluminum adhesive. When the coating is used, the powder and water are mixed according to the weight ratio of 2:1 and ball-milled into slurry, the slurry is ball-milled to the granularity of 200-.
Description
Technical Field
The invention relates to the technical field of stainless steel heat treatment, in particular to a high-temperature anti-oxidation coating for heat treatment of a stainless steel workpiece and a preparation method thereof.
Background
A stainless steel workpiece heat treatment process, which comprises a heating treatment process of solid solution heat treatment, homogenization heat treatment, normalizing heat treatment, quenching heat treatment, stabilization annealing treatment, stress relief treatment, sensitization treatment and normal workpiece heat processing; stainless steel workpieces such as steel ingots, steel billets, steel plates and other stainless steel section bar articles need to be placed into an industrial heat treatment furnace or a heating furnace for heating in the heat treatment processing procedure, and the heating temperature is generally 600-; the method of heating the exposed workpiece in the furnace is adopted at present, and the heating method has the following defects:
1. the mass transfer between the stainless steel material and the gas in the furnace occurs in the heating process:
(a) the stainless steel metal component and the oxidizing atmosphere in the furnace are subjected to chemical reaction, namely, the metal element absorbs oxygen element from the furnace gas, oxide is generated on the metal surface, oxidation burning loss is generated, and the metal yield is reduced; the generated iron scale is complex, the utilization and disposal difficulty is high, and precious metal resources are wasted;
(b) the trace elements in the stainless steel metal are taken away by the furnace gas, and a trace element loss layer is formed on the surface of the substrate, such as molybdenum-containing element stainless steel, and the surface quality of a stainless steel workpiece is directly influenced by the volatilization of molybdenum;
2. the stainless steel surface oxidized after the heat treatment process generates scale which is difficult to remove, and the surface pickling is generally carried out by strong acid such as nitric acid and hydrofluoric acid composite acid:
generally, the pickling process of a stainless steel workpiece subjected to heat treatment is indispensable in the stainless steel industry, so that the production efficiency is influenced to a certain extent, a large amount of acid liquor is consumed, and the pickling environment has certain influence on the health of workers; the waste acid liquor can cause secondary pollution, particularly fluorine-containing waste liquor, and permanent damage can be caused to air and underground water due to the incapability of storage or treatment. The stainless steel waste acid has huge regeneration or disposal investment and is influenced by the treatment scale; generally, stainless steel heat treatment enterprises are relatively dispersed, the treatment scale is small, the waste acid production amount is small, and a continuous waste acid regeneration system is difficult to realize stable operation, so that the phenomena of stealing, discharging or leakage are difficult to avoid.
Pollution is prevented and treated from the source, raw material investment is optimized, and the laggard production process technology is eliminated according to laws and regulations. A green production mode is actively pursued, technical innovation is vigorously developed, the pushing force of clean production is increased, the overall process management is enhanced, and the pollutant emission is reduced. Provides resource-saving and environment-friendly products and services. The producer responsibility extension system is implemented. On the premise of no good feasible pollution treatment technology at the source, the pollution treatment cost and the production environment protection pressure in the implementation process of the environment protection policy are the limes of enterprises for stainless steel heat treatment, particularly relating to the pickling process, and the problems cannot be well solved in the long run.
In the conventional use of metal workpieces, the coating or paint protection application is very wide; the protected metal can ensure the original metal color of the matrix for a long time, and corrosion and oxidation under the normal temperature condition are prevented; such as household electrical appliances, automobiles, engineering machinery, steel structures, roof steel plates and the like, all adopt coating or paint to protect metals and have attractive effect.
The high-temperature coating is widely applied to high-temperature thermal equipment, and mainly plays a role in delaying or preventing corrosion and oxidation of metal parts and the like in a high-temperature environment; the basic surface performance of the metal material at high temperature can be ensured by the coating material which can completely prevent oxidation, and the original surface color of the metal can be recovered if the coating can automatically fall off or can be dissolved and peeled off by simple washing when the temperature is reduced to normal temperature; for stainless steel, the surface is not oxidized, namely the prior pickling process can be abandoned, and the grinding process for improving the efficiency of workpiece processing production, reducing the consumption of pickling, the treatment of waste acid and necessary oxidation defects is carried out.
At present, the research on stainless steel high-temperature anti-oxidation coatings is more at home and abroad, but the coating can rarely completely prevent the high-temperature oxidation of the stainless steel, so that the zero-oxidation effect of the stainless steel in a high-temperature environment is really realized; in addition, no report is found that the coating formed by the stainless steel high-temperature anti-oxidation coating after the stainless steel workpiece is subjected to heat treatment protection can completely realize 100% automatic falling or water washing falling; for example, the Chinese patent CN 102140265A discloses a high-temperature resistant coating of stainless steel, which comprises 35-50 parts of nano-scale aluminum oxide, 15-25 parts of manganese dioxide, 10-15 parts of sodium silicate, 9 parts of cobalt blue, 10-15 parts of lithium bentonite, 16 parts of molybdenum trioxide, 8 parts of cobalt oxide, 15 parts of calcium oxide, 10 parts of aluminum oxide, 15-20 parts of iron oxide red, 16-19 parts of graphite and 45-55 parts of water, and the coating product prepared by stirring according to the weight ratio is proved by industrial tests to have good antioxidant protection effect under the high-temperature condition, simple preparation, convenient use and favorable popularization and application; but the high-temperature oxidation resistance of the stainless steel cannot be realized by 100 percent, and the pickling process can be reduced; the Chinese invention patent CN 106700665A discloses a stainless steel high temperature resistant coating, which comprises, by mass, 5-8 parts of aluminum oxide, 18-40 parts of sodium silicate, 80-120 parts of manganese dioxide, 30-60 parts of calcium oxide, 2-5 parts of cobalt blue and 25-30 parts of aluminum dihydrogen phosphate; the coating disclosed by the invention is mainly used for coating and protecting the surface of stainless steel, can effectively prevent high-temperature oxidation of a metal material, forms a compact protective film on the surface of the stainless steel, effectively prevents decarburization, is cheap and easy to obtain raw materials, and is simple to prepare; the invention patent mainly relates to the use environment of stainless steel in special occasions, such as processing factories, manufacturing workshops and other high-temperature places with severe environment, the used coating needs to meet the high-temperature resistant condition, and the coating belongs to a permanent coating from the application point of view, and the coating does not have self-peeling performance.
Chinese invention patent CN101462859A discloses a high-temperature anti-oxidation coating for reducing the oxidation burning loss of stainless steel in a heating furnace, which is characterized in that the coating is composed of a solid material containing 46-92% of basic filler and 8-54% of composite binder, and water which is 0.5-20 times of the weight of the solid material; the chemical components of the basic filler are several of silicon dioxide, aluminum oxide, magnesium oxide, calcium oxide and boron oxide, and the composite binder consists of several of sodium silicate, lithium silicate, potassium silicate and aluminum phosphate; the coating can be coated at normal temperature and can be sprayed on the surface of a stainless steel billet at room temperature to 1000 ℃; the coating forms a protective coating at high temperature, so that the high-temperature oxidation burning loss of the stainless steel at 1400 ℃ can be greatly reduced, the oxidation burning loss per unit area is reduced by more than 90 percent, the iron oxide sheet can be completely stripped under the action of cooling or high-pressure water after being discharged from a furnace, the amount of the generated iron oxide sheet is also obviously reduced, and the surface quality of the stainless steel is obviously improved; the invention is more inclined to the application of the coating in the heating furnace of a steel rolling mill, the effect can reach more than 90 percent, but 100 percent of oxidation resistance is not absolutely realized, meanwhile, the rolling process determines that secondary oxidation is still generated in the later billet rolling process, and the surface of the stainless steel can reach a whitening state by inevitably carrying out acid pickling treatment on the surface of the stainless steel at the downstream.
The patent applications of the invention, which are filed in 2016 by Changxing Tianchen energy science and technology Co., Ltd, include CN106634557A, CN106634557A, CN106700897A, CN106700899A and CN106811110A, disclose five high-temperature-resistant and oxidation-resistant coatings for SiAlON-based stainless steel, and the series of coatings are disclosed to be applied to stainless steel billets in the processes of rolling, heat treatment and the like, so that the problem of high-temperature cracking of the coatings is relieved, and the oxidation resistance is improved.
Disclosure of Invention
The invention aims to solve the problems, and provides the high-temperature anti-oxidation coating for the heat treatment of the stainless steel workpiece, which can realize 100 percent of anti-oxidation effect on the stainless steel workpiece in the heat treatment process and can realize 100 percent of automatic falling of a coating after the heat treatment heating, and the preparation method thereof.
The invention solves the problems and firstly provides a high-temperature anti-oxidation coating for heat treatment of stainless steel workpieces, which adopts the technical scheme that:
the high-temperature anti-oxidation coating for the heat treatment of the stainless steel workpiece comprises coating powder and water, wherein the coating powder comprises the following raw materials in percentage by weight: 30-45% of montmorillonite, 1-5% of iron oxyhydroxide, 20-30% of brucite, 1-5% of calcium ferrite and 30-35% of complex magnesium aluminum adhesive; the weight ratio of the coating powder to the water is 2: 1.
The invention also provides a preparation method of the high-temperature anti-oxidation coating for the heat treatment of the stainless steel workpiece, which comprises the following steps:
s1, weighing the components according to the formula;
s2, mixing the paint powder and water according to the weight ratio of 2:1, ball-milling into slurry, and ball-milling to the particle size of 200-400 meshes to obtain the paint.
Compared with the prior art, the invention adopting the technical scheme has the outstanding characteristics that:
compared with other protective coatings, the coating has the advantages of simple coating process, low cost, high temporary anti-oxidation effect, automatic subsequent stripping and no difficulty in removing the coating; the anti-oxidation coating formed by spraying the coating on the surface of the stainless steel workpiece creates an environment in which the surface of the heated workpiece is in zero-oxidation atmosphere contact, and plays a role in absolutely preventing oxidation; the coating has the advantages that zero burning loss of the surface of the stainless steel in the heating process is realized, zero loss of trace alloy elements in metal is realized, consistency of the surface of the stainless steel and internal materials is guaranteed, surface quality of a workpiece is further improved, the coating is self-peeled after heat treatment, a subsequent pickling process is relieved, production efficiency is improved, and environmental protection pressure caused by pickling in the production process is reduced.
The specific implementation mode is as follows:
the invention will be further illustrated by the following examples, which are intended only for a better understanding of the present invention and therefore do not limit the scope of the invention.
Example 1
The 304 austenitic stainless steel has serious oxidation corrosion in the heat treatment process of more than 900 ℃; mixing the coating powder material of the invention and water according to the proportion of 2:1 proportion, fully stirring and mixing to obtain coating slurry, wherein the coating powder consists of montmorillonite, iron oxyhydroxide, brucite, calcium ferrite and complex magnesium aluminum adhesive according to the weight percentage in the following table; spraying the coating on the surface of 304 austenitic stainless steel, wherein the thickness of the coating is 100 mu m; the 304 austenitic stainless steel coated with the coating shows good oxidation resistance in the solid melting heat treatment process at 1050 ℃, the coating does not crack after being oxidized for 5 hours, the coating is automatically peeled off after being discharged from a furnace, and the oxidation burning loss in the heating process of a steel piece is 0.
Example 1 coating powder composition (weight percent):
example 2
The 316L austenitic stainless steel has serious oxidation corrosion above 950 ℃; mixing the coating powder material of the invention and water according to the proportion of 2:1 proportion, fully stirring and mixing to obtain coating slurry, wherein the coating powder consists of montmorillonite, iron oxyhydroxide, brucite, calcium ferrite and complex magnesium aluminum adhesive according to the weight percentage in the following table; spraying the coating on the surface of 316L austenitic stainless steel, wherein the thickness of the coating is 150 mu m; the 316L austenitic stainless steel coated with the coating has good oxidation resistance in the heat treatment process at 980 ℃, the coating does not crack after being oxidized for 3 hours, the coating is automatically peeled off after being discharged from a furnace, and the oxidation burning loss is 0.
Example 2 coating powder composition (weight percent):
example 3
410 ferritic stainless steel has serious oxidation corrosion at the temperature of more than 700 ℃; mixing the coating powder material of the invention and water according to the proportion of 2:1, fully stirring and mixing the raw materials in a proportion of 1 to obtain coating slurry, wherein the coating powder consists of montmorillonite, iron oxyhydroxide, brucite, calcium ferrite and complex magnesium aluminum adhesive in percentage by weight in the following table; spraying the coating on the surface of 410 ferritic stainless steel, wherein the thickness of the coating is 200 mu m; the 410 stainless steel coated with the coating shows good oxidation resistance in the heat treatment process at 920 ℃, the oxidation burning loss of the matrix is 0 after the heating for 2 hours, and the coating is automatically peeled off after the steel is taken out of the furnace.
Example 3 coating powder composition (weight percent):
example 4
0Cr13 is martensitic stainless steel, and is seriously oxidized and corroded at the temperature of more than 800 ℃; mixing the coating powder material of the invention and water according to the proportion of 2:1 proportion is fully stirred and mixed to obtain coating slurry, wherein the coating powder consists of montmorillonite, iron oxyhydroxide, brucite, calcium ferrite and complex magnesium aluminum adhesive according to the weight percentage in the following table; spraying the coating on the surface of 0Cr13 martensitic stainless steel, wherein the thickness of the coating is 250 mu m; the 0Cr13 martensitic stainless steel coated with the coating has good oxidation resistance in the heat treatment process at 1000 ℃, the oxidation burning loss of the matrix is 0 after heating for 4 hours, and the coating is automatically peeled off after discharging.
Example 4 coating powder composition (weight percent):
example 5
0Cr26Ni5Mo2 austenite-ferrite duplex stainless steel, which has serious oxidation corrosion at the temperature of more than 1000 ℃; mixing the coating powder material of the invention and water according to the proportion of 2:1, fully stirring and mixing to obtain coating slurry, wherein the coating powder consists of montmorillonite, iron oxyhydroxide, brucite, calcium ferrite and complex magnesium aluminum adhesive in percentage by weight in the following table; the coating is sprayed on the surface of 0Cr26Ni5Mo2 austenite-ferrite duplex stainless steel, and the thickness of the coating is 300 mu m. The 0Cr26Ni5Mo2 austenite-ferrite duplex stainless steel coated with the coating has good oxidation resistance in the heat treatment process at 1100 ℃, the oxidation burning loss of a matrix is 0 after heating for 10 hours, and the coating is automatically peeled off after discharging.
Example 5 coating powder composition (weight percent):
in conclusion, the coating is directly sprayed or brushed on the surface of the stainless steel to be heat-treated, the thickness of the formed coating is 100-; the stainless steel workpiece can be made of nickel-chromium austenitic stainless steel, ferrite stainless steel, martensitic stainless steel, double-phase stainless steel and precipitation hardening stainless steel; the anti-oxidation temperature of the coating is 600-1100 ℃, and the anti-oxidation time is 1-10 hours; the heat treatment process of the stainless steel workpiece comprises the working procedures of solid solution heat treatment, homogenization heat treatment, normalizing heat treatment, quenching heat treatment, stabilization annealing treatment, stress relief treatment, sensitization treatment and heating treatment in the normal workpiece heat processing process.
Compared with other protective coatings, the coating has the advantages of simple coating process, low cost, high temporary anti-oxidation effect, automatic subsequent stripping and no difficulty in removing the coating; the anti-oxidation coating formed by spraying the coating on the surface of the stainless steel workpiece creates an environment in which the surface of the heated workpiece is in zero-oxidation atmosphere contact, and plays a role in absolutely preventing oxidation; the coating has the advantages that zero burning loss of the surface of the stainless steel in the heating process is realized, zero loss of trace alloy elements in metal is realized, consistency of the surface of the stainless steel and internal materials is guaranteed, surface quality of a workpiece is further improved, the coating is self-peeled after heat treatment, a subsequent pickling process is relieved, production efficiency is improved, and environmental protection pressure caused by pickling in the production process is reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, which is defined by the appended claims.
Claims (2)
1. The high-temperature anti-oxidation coating for the heat treatment of the stainless steel workpiece comprises coating powder and water, and is characterized in that the coating powder comprises the following raw materials in percentage by weight: 30-45% of montmorillonite, 1-5% of iron oxyhydroxide, 20-30% of brucite, 1-5% of calcium ferrite and 30-35% of complex magnesium aluminum adhesive; the weight ratio of the coating powder to the water is 2: 1.
2. The preparation method of the high-temperature anti-oxidation coating for the heat treatment of the stainless steel workpiece according to claim 1, which is characterized by comprising the following steps:
s1, weighing the components according to the formula of claim 1;
s2, mixing the paint powder and water according to the weight ratio of 2:1, ball-milling into slurry, and ball-milling to the particle size of 200-400 meshes to obtain the paint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110288735.9A CN113045912A (en) | 2021-03-18 | 2021-03-18 | High-temperature anti-oxidation coating for heat treatment of stainless steel workpiece and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110288735.9A CN113045912A (en) | 2021-03-18 | 2021-03-18 | High-temperature anti-oxidation coating for heat treatment of stainless steel workpiece and preparation method thereof |
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| CN113045912A true CN113045912A (en) | 2021-06-29 |
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| CN202110288735.9A Withdrawn CN113045912A (en) | 2021-03-18 | 2021-03-18 | High-temperature anti-oxidation coating for heat treatment of stainless steel workpiece and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115558318A (en) * | 2022-09-16 | 2023-01-03 | 中钢不锈钢管业科技山西有限公司 | High-temperature antioxidant coating for solution heat treatment of stainless steel welded pipe and application method |
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2021
- 2021-03-18 CN CN202110288735.9A patent/CN113045912A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115558318A (en) * | 2022-09-16 | 2023-01-03 | 中钢不锈钢管业科技山西有限公司 | High-temperature antioxidant coating for solution heat treatment of stainless steel welded pipe and application method |
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Application publication date: 20210629 |