CN108485328B - Normal-temperature curing inorganic coating, preparation method thereof and coated workpiece - Google Patents

Normal-temperature curing inorganic coating, preparation method thereof and coated workpiece Download PDF

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CN108485328B
CN108485328B CN201810409600.1A CN201810409600A CN108485328B CN 108485328 B CN108485328 B CN 108485328B CN 201810409600 A CN201810409600 A CN 201810409600A CN 108485328 B CN108485328 B CN 108485328B
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CN108485328A (en
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王永光
刘雅玄
赵栋
赵永武
陈瑶
卞达
齐菲
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BEIJING OUYALVBANG TECHNOLOGY CO.,LTD.
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Suzhou University
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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
    • 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
    • C09D5/08—Anti-corrosive paints
    • 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 provides a normal temperature curing inorganic coating, which comprises a component A and a component B; the component A comprises: 50-65 parts by weight of a metal phosphate binder; 33-42 parts by weight of aluminum oxide; 2-8 parts by weight of manganese dihydrogen phosphate; 0-2 parts by weight of graphene oxide; the component B comprises: 50-65 parts by weight of silica; 10-15 parts by weight of high alumina cement; 15-25 parts by weight of clay powder; 8-15 parts by weight of magnesium oxide; the metal ions in the metal phosphate binder are one or more of aluminum ions, zinc ions, copper ions, iron ions, ferrous ions and calcium ions; the mass ratio of the component A to the component B is (4-5): 1; the thickness of the graphene oxide is 4-20 nm; the graphene oxide micro-sheet size is 5-10 μm. The invention also provides a preparation method of the normal-temperature curing inorganic coating and a coated workpiece.

Description

Normal-temperature curing inorganic coating, preparation method thereof and coated workpiece
Technical Field
The invention belongs to the technical field of anticorrosive materials, and particularly relates to a normal-temperature curing inorganic coating, a preparation method thereof and a coated workpiece.
Background
As is well known, in the world today, with the continuous development of the world economy, the development and application of metal materials have occupied a considerable proportion and become the most widely used engineering materials for human beings. However, the pure metal materials have many problems in the aspects of high-temperature oxidation resistance, corrosion resistance, abrasion resistance and the like, and the service life and the application range of the pure metal materials are severely limited. The metal ceramic coating has the advantages of both metal and ceramic, has the heat resistance, wear resistance and corrosion resistance of ceramic materials, and has the toughness of metal materials, so that some materials can be used in some special occasions, and the material selection and part design range is widened.
At present, the metal ceramic coating is successfully applied to the industries of aerospace, military industry, electronics, machinery, chemical engineering and the like. The high-temperature-resistant bonding ceramic coating is a typical representative of high-temperature-resistant protective coatings, and compared with technologies such as thermal spraying, vapor deposition, self-propagating high-temperature synthesis and the like, the bonding ceramic coating obtained by a solid-phase reaction method has the advantages of small residual stress, low surface treatment cost, simple process and the like. More importantly, the construction method can meet the field construction requirement in severe environment, and greatly broadens the popularization and application of the construction method in large-scale equipment. Chinese patent 201510399025.8 discloses an alkali-resistant ceramic coating material and a preparation method thereof, which can be cured in a wider temperature range, but is difficult to realize normal temperature curing. Chinese patent 201510807495.3 reports that an aqueous aluminum phosphate-containing ceramic anticorrosive coating and a preparation and curing method thereof require a curing temperature of 120 ℃. Early patent 201310378767.3 discloses a high temperature resistant room temperature curing phosphate adhesive and a method for preparing the same, which provides a beneficial idea for realizing room temperature curing of ceramic coatings. Unfortunately, the coating preparation contains chromium oxide, which is a major environmental hazard.
In view of the above, the preparation of the high temperature resistant adhesive ceramic coatings disclosed in the prior art is basically based on high temperature curing, which still has the following problems in terms of industrial application: firstly, the coating is difficult to be applied to large-scale industrial equipment, secondly, the baking process is tedious, consumes time and consumes energy, and thirdly, the chromium oxide added in the coating preparation has great harm to the environment.
Disclosure of Invention
The invention aims to provide a normal-temperature curing inorganic coating, a preparation method thereof and a coated workpiece.
The invention provides a normal temperature curing inorganic coating, which comprises a component A and a component B;
the component A comprises:
50-65 parts by weight of a metal phosphate binder;
33-42 parts by weight of aluminum oxide;
2-8 parts by weight of manganese dihydrogen phosphate;
0-2 parts by weight of graphene oxide;
the component B comprises:
50-65 parts by weight of silica;
10-15 parts by weight of high alumina cement;
15-25 parts by weight of clay powder;
8-15 parts by weight of magnesium oxide;
the metal ions in the metal phosphate binder are one or more of aluminum ions, zinc ions, copper ions, iron ions, ferrous ions and calcium ions.
The mass ratio of the component A to the component B is (4-5): 1.
the thickness of the graphene oxide is 4-20 nm;
the graphene oxide micro-sheet size is 5-10 μm.
Preferably, the grain diameter of the aluminum oxide is 20-40 μm.
The invention provides a preparation method of a normal-temperature curing inorganic coating, which comprises the following steps:
A) mixing a metal compound with a phosphoric acid solution, and heating to obtain a metal phosphate binder;
B) mixing 33-42 parts by weight of aluminum oxide, 0-2 parts by weight of graphene oxide and 2-8 parts by weight of manganese dihydrogen phosphate, then carrying out ball milling, standing the ball-milled mixture for 20-30 hours after the ball milling is finished, and adding 50-65 parts by weight of metal phosphate binder to obtain a component A;
the rotating speed of the ball milling is 250-300 r/min;
the ball milling time is 5-10 hours;
C) mixing 50-65 parts by weight of silicon dioxide, 10-15 parts by weight of high alumina cement, 15-25 parts by weight of clay powder and 8-15 parts by weight of magnesium oxide to obtain a component B;
D) and mixing the component A and the component B to obtain the normal-temperature curing inorganic coating.
The invention provides a coated workpiece, which comprises a metal substrate and a coating coated on the surface of the metal substrate;
the coating is obtained by curing the normal-temperature curing inorganic coating on the surface of the metal matrix at normal temperature.
Preferably, the thickness of the coating is 0.1-0.4 mm.
The invention provides a normal temperature curing inorganic coating, which comprises a component A and a component B; the component A comprises: 50-65 parts by weight of a metal phosphate binder; 33-42 parts by weight of aluminum oxide; 2-8 parts by weight of manganese dihydrogen phosphate; 0-2 parts by weight of graphene oxide; the component B comprises: 50-65 parts by weight of silica; 10-15 parts by weight of high alumina cement; 15-25 parts by weight of clay powder; 8-15 parts by weight of magnesium oxide; the metal ions in the metal phosphate binder are one or more of aluminum ions, zinc ions, copper ions, iron ions, ferrous ions and calcium ions. The mass ratio of the component A to the component B is (4-5): 1. the thickness of the graphene oxide is 4-20 nm; the graphene oxide micro-sheet size is 5-10 μm.
The normal-temperature self-curing ceramic coating provided by the invention can be self-cured at normal temperature, so that the cost of the coating in industrial practical application is greatly saved, the construction difficulty is reduced, and the popularization and application of the coating in large-scale equipment are widened. Experimental results show that when the graphene oxide reinforced environment-friendly normal-temperature self-curing ceramic coating provided by the invention is coated on the surface of a metal member, a formed wet coating is surface-dried within 1 hour in a room-temperature ventilation environment, is completely dried within 24 hours, and is fully cured within 25 days.
In addition, the normal-temperature self-curing ceramic coating provided by the invention comprises manganese dihydrogen phosphate and graphene oxide, and has a good antirust effect in steel products, so that the corrosion resistance of the graphene oxide reinforced environment-friendly normal-temperature self-curing ceramic coating prepared by the method is greatly improved. The coating in the present invention showed no rust occurrence over 100 hours in the salt spray resistance test without damaging the coating.
Secondly, the normal-temperature self-curing ceramic coating provided by the invention comprises graphene oxide, and the special two-dimensional structure and mechanical property of the graphene oxide can well reduce the expansion of ceramic cracks, improve the toughness of an aluminum oxide ceramic material, increase the bonding strength of a coating substrate material and improve the corrosion resistance of the coating. The coating does not contain toxic elements such as chromium and the like, and is healthy and environment-friendly.
Moreover, the graphene oxide reinforced environment-friendly normal-temperature self-curing ceramic coating provided by the invention has good compactness, wear resistance, friction reduction and corrosion resistance; and the preparation process is simple and convenient, the cost is low, and the method has wide application prospect.
Detailed Description
The invention provides a normal temperature curing inorganic coating, which comprises a component A and a component B;
the component A comprises:
50-65 parts by weight of a metal phosphate binder;
33-42 parts by weight of aluminum oxide;
2-8 parts by weight of manganese dihydrogen phosphate;
0-2 parts by weight of graphene oxide;
the component B comprises:
50-65 parts by weight of silica;
10-15 parts by weight of high alumina cement;
15-25 parts by weight of clay powder;
8-15 parts by weight of magnesium oxide;
the metal ions in the metal phosphate binder are one or more of aluminum ions, zinc ions, copper ions, iron ions, ferrous ions and calcium ions.
The mass ratio of the component A to the component B is (4-5): 1.
the thickness of the graphene oxide is 4-20 nm;
the graphene oxide micro-sheet size is 5-10 μm.
In the component A, the metal ions in the metal phosphate binder are one or more of aluminum ions, zinc ions, copper ions, iron ions, ferrous ions and calcium ions. The metal phosphate binder is prepared by reacting a metal compound, preferably a metal oxide and/or a metal hydroxide, with a phosphoric acid solution. The preferable weight part of the metal phosphate binder is 55-60 parts.
The preferred weight portion of the aluminum oxide is 35-40, and the preferred particle size of the aluminum oxide is 20-40 μm, and more preferably 25-35 μm.
The weight part of the manganese dihydrogen phosphate is preferably 3-7 parts, more preferably 4-6 parts, and most preferably 5 parts.
The preferable weight part of the graphene oxide is 0.5-1 part; the thickness of the graphene oxide is preferably 4-20 nm, more preferably 5-18 nm, and most preferably 10-15 nm; the size of the graphene oxide micro-sheet is preferably 5-10 μm, more preferably 6-9 μm, and most preferably 7-8 μm.
In the component B, the preferable weight part of the silicon dioxide is 55-60 parts; the weight part of the high-alumina cement is preferably 11-14 parts, and more preferably 12-13 parts; the clay powder is preferably 18-23 parts by weight, and more preferably 20-22 parts by weight; the weight part of the magnesium oxide is preferably 10-14 parts, and more preferably 12-13 parts.
The mass ratio of the component A to the component B is preferably (4-5): 1, more preferably 4.5: 1.
The invention also provides a preparation method of the normal-temperature curing inorganic coating, which comprises the following steps:
A) mixing a metal compound with a phosphoric acid solution, and heating to obtain a metal phosphate binder;
B) mixing 33-42 parts by weight of aluminum oxide, 0-2 parts by weight of graphene oxide and 2-8 parts by weight of manganese dihydrogen phosphate, then carrying out ball milling, and adding 50-65 parts by weight of metal phosphate binder after the ball milling is finished to obtain a component A;
C) mixing 50-65 parts by weight of silicon dioxide, 10-15 parts by weight of high alumina cement, 15-25 parts by weight of clay powder and 8-15 parts by weight of magnesium oxide to obtain a component B;
D) and mixing the component A and the component B to obtain the normal-temperature curing inorganic coating.
In the present invention, the amount of the raw materials is the same as the amount of the raw materials in the above description, and the description thereof is omitted.
In the invention, the metal compound is preferably a metal oxide and/or a metal hydroxide, and the metal species in the metal compound is preferably one or more of aluminum, zinc, copper, iron, ferrous iron and calcium. The molar ratio of phosphorus element in the metal phosphate binder in the component A to metal element in the component A is (2.0-4.0): 1.
in the invention, the ball milling is preferably carried out by adopting a star-type ball mill, a pot body used in the ball milling is a ceramic pot, and the small ball milling medium is agate balls. The ball material ratio is preferably (1-4): 1, more preferably (2-3): 1. the rotation speed of the ball milling tank is preferably 250-300 r/min, more preferably 260-300 r/min, most preferably 280-300 r/min, the forward and reverse directions are alternately operated, and the rotation speed of the ball milling turntable is about 1/2 of the rotation speed of the ball milling tank. And alternately operating the forward and reverse directions every 2 hours, operating for 5-10 hours in total, stopping the operation of the ball mill, more preferably 6-8 hours, taking down the ball tank, standing for 20-30 hours, more preferably 24-28 hours, and sampling again to enable the powder obtained after ball milling to have a relaxation process. Then adding phosphate binder and mixing to obtain the component A.
In the invention, the mixing of the component A and the component B is preferably ultrasonic mixing, and the component A and the component B are preferably subjected to ultrasonic dispersion by an ultrasonic instrument.
The invention also provides a coated workpiece, which comprises a metal matrix and a coating coated on the surface of the metal matrix;
the coating is obtained by curing the normal-temperature curing inorganic coating on the surface of the metal matrix at normal temperature.
The thickness of the coating is preferably 0.1-0.4 mm, and more preferably 0.2-0.3 mm.
The metal matrix is preferably steel; specifically, Q235 steel may be used.
The invention provides a normal temperature curing inorganic coating, which comprises a component A and a component B; the component A comprises: 50-65 parts by weight of a metal phosphate binder; 33-42 parts by weight of aluminum oxide; 2-8 parts by weight of manganese dihydrogen phosphate; 0-2 parts by weight of graphene oxide; the component B comprises: 50-65 parts by weight of silica; 10-15 parts by weight of high alumina cement; 15-25 parts by weight of clay powder; 8-15 parts by weight of magnesium oxide.
The graphene oxide reinforced environment-friendly normal-temperature self-curing ceramic coating provided by the invention can be self-cured at normal temperature, so that the cost of the coating in industrial practical application is greatly saved, the construction difficulty is reduced, and the popularization and application of the coating in large-scale equipment are widened. Experimental results show that when the graphene oxide reinforced environment-friendly normal-temperature self-curing ceramic coating provided by the invention is coated on the surface of a metal member, a formed wet coating is surface-dried within 1 hour in a room-temperature ventilation environment, is completely dried within 24 hours, and is fully cured within 25 days.
In addition, the graphene oxide reinforced environment-friendly normal-temperature self-curing ceramic coating provided by the invention comprises manganese dihydrogen phosphate, and the manganese dihydrogen phosphate can play a good antirust effect in steel products, so that the corrosion resistance of the graphene oxide reinforced environment-friendly normal-temperature self-curing ceramic coating prepared by the invention is greatly improved.
Secondly, the graphene oxide reinforced environment-friendly normal-temperature self-curing ceramic coating provided by the invention comprises graphene oxide, and the special two-dimensional structure and mechanical property of the graphene oxide reinforced environment-friendly normal-temperature self-curing ceramic coating can well reduce the expansion of ceramic cracks, improve the toughness of an aluminum oxide ceramic material, increase the bonding strength of a coating substrate material and improve the corrosion resistance of the coating. The coating does not contain toxic elements such as chromium and the like, and is healthy and environment-friendly.
Moreover, the graphene oxide reinforced environment-friendly normal-temperature self-curing ceramic coating provided by the invention has good compactness, wear resistance, friction reduction and corrosion resistance; and the preparation process is simple and convenient, the cost is low, and the method has wide application prospect.
In order to further illustrate the present invention, the following examples are provided to describe an ambient temperature curing inorganic coating and a method for preparing the same in detail, but should not be construed as limiting the scope of the present invention.
Example 1
Weighing powder according to 1 part of graphene oxide, 42 parts of aluminum oxide and 2 parts of manganese dihydrogen phosphate, ball-milling for 8 hours at 300r/min by using a planetary ball mill, weighing 55 parts of phosphate binder, uniformly mixing the mixed aggregate and the phosphate binder, and magnetically stirring for 4 hours to obtain a component A of the coating.
And weighing powder according to 55 parts of silicon dioxide, 10 parts of high-alumina cement, 25 parts of clay powder and 10 parts of magnesium oxide to obtain the component B of the coating.
And (3) mixing the obtained component A and component B according to the ratio of 4: 1, mixing, and after the mixed solution is stirred uniformly manually, performing ultrasonic dispersion for 1 hour by using an ultrasonic instrument to obtain the graphene oxide reinforced environment-friendly normal-temperature self-curing ceramic coating.
The obtained graphene oxide reinforced environment-friendly normal-temperature self-curing ceramic coating is coated on Q235 steel which is subjected to deoiling treatment, the thickness of the coating is about 0.2mm, then the coating is placed under the condition of drying and ventilation at room temperature, the surface is dried within 1 hour, the coating is dried within 24 hours, and after 25 days, test tests are carried out, and the results show that:
high temperature resistance: the thermal weight loss dehydration at 1000 ℃ is not more than 5 percent;
wear resistance: 500 g after 1000 turns, 0.085g loss and 0.5 friction coefficient;
salt spray resistance: no rust appears after 100 hours under the condition of not damaging the surface coating;
the application time is as follows: for 12 hours.
Example 2
Weighing powder according to 1 part of graphene oxide, 42 parts of aluminum oxide and 2 parts of manganese dihydrogen phosphate, ball-milling for 8 hours at 300r/min by using a planetary ball mill, weighing 55 parts of phosphate binder, uniformly mixing the mixed aggregate and the phosphate binder, and magnetically stirring for 4 hours to obtain a component A of the coating.
And weighing powder according to 60 parts of silicon dioxide, 10 parts of high-alumina cement, 20 parts of clay powder and 10 parts of magnesium oxide to obtain the component B of the coating.
The obtained A component and B component are mixed according to the weight ratio of 4.5:1, mixing, and after the mixed solution is stirred uniformly manually, performing ultrasonic dispersion for 1 hour by using an ultrasonic instrument to obtain the graphene oxide reinforced environment-friendly normal-temperature self-curing ceramic coating.
The obtained graphene oxide reinforced environment-friendly normal-temperature self-curing ceramic coating is coated on Q235 steel which is subjected to deoiling treatment, the thickness of the coating is about 0.32mm, then the coating is placed under the condition of drying and ventilation at room temperature, the surface is dried within 1 hour, the coating is dried within 24 hours, and after 25 days, test tests are carried out, and the results show that:
high temperature resistance: the thermal weight loss dehydration at 1000 ℃ is not more than 5 percent;
wear resistance: 500 g at 1000 turns, 0.082g of loss amount and 0.48 of friction coefficient;
salt spray resistance: no rust appears after 100 hours under the condition of not damaging the surface coating;
the application time is as follows: for 12 hours.
Example 3
Weighing powder according to 2 parts of graphene oxide, 41 parts of aluminum oxide and 2 parts of manganese dihydrogen phosphate, ball-milling for 8 hours at 300r/min by using a planetary ball mill, weighing 55 parts of phosphate binder, uniformly mixing the mixed aggregate and the phosphate binder, and magnetically stirring for 4 hours to obtain a component A of the coating.
And weighing powder according to 60 parts of silicon dioxide, 10 parts of high-alumina cement, 20 parts of clay powder and 10 parts of magnesium oxide to obtain the component B of the coating.
The obtained A component and B component are mixed according to the weight ratio of 4.5:1, mixing, and after the mixed solution is stirred uniformly manually, performing ultrasonic dispersion for one hour by using an ultrasonic instrument to obtain the graphene oxide reinforced environment-friendly normal-temperature self-curing ceramic coating.
The obtained graphene oxide reinforced environment-friendly normal-temperature self-curing ceramic coating is coated on Q235 steel which is subjected to deoiling treatment, the thickness of the coating is about 0.42mm, then the coating is placed under the condition of drying and ventilation at room temperature, the surface is dried within 1 hour, the coating is dried within 24 hours, and after 25 days, test tests are carried out, and the results show that:
high temperature resistance: the thermal weight loss dehydration at 1000 ℃ is not more than 5 percent;
wear resistance: 500 g after 1000 revolutions, 0.080g loss amount and 0.45 friction coefficient;
salt spray resistance: no rust appears after 100 hours under the condition of not damaging the surface coating;
the application time is as follows: for 12 hours.
Example 4
Weighing powder according to 2 parts of graphene oxide, 41 parts of aluminum oxide and 2 parts of manganese dihydrogen phosphate, ball-milling for 8 hours at 300r/min by using a planetary ball mill, weighing 55 parts of phosphate binder, uniformly mixing the mixed aggregate and the phosphate binder, and magnetically stirring for 4 hours to obtain a component A of the coating.
And weighing powder according to 60 parts of silicon dioxide, 10 parts of high-alumina cement, 17 parts of clay powder and 13 parts of magnesium oxide to obtain the component B of the coating.
The obtained component A and component B are mixed according to the weight ratio of 5.0: 1, mixing, and after the mixed solution is stirred uniformly manually, performing ultrasonic dispersion for one hour by using an ultrasonic instrument to obtain the graphene oxide reinforced environment-friendly normal-temperature self-curing ceramic coating.
The obtained graphene oxide reinforced environment-friendly normal-temperature self-curing ceramic coating is coated on Q235 steel which is subjected to deoiling treatment, the thickness of the coating is about 0.25mm, then the coating is placed under the condition of drying and ventilation at room temperature, the surface is dried within 1 hour, the coating is dried within 24 hours, and after 25 days, test tests are carried out, and the results show that:
high temperature resistance: the thermal weight loss dehydration at 1000 ℃ is not more than 5 percent;
wear resistance: 500 g after 1000 revolutions, 0.078g loss and 0.44 friction coefficient;
salt spray resistance: no rust appears after 100 hours under the condition of not damaging the surface coating;
the application time is as follows: for 12 hours.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (5)

1. A normal temperature curing inorganic coating comprises a component A and a component B;
the component A comprises:
50-65 parts by weight of a metal phosphate binder;
33-42 parts by weight of aluminum oxide;
2-8 parts by weight of manganese dihydrogen phosphate;
1-2 parts by weight of graphene oxide;
the component B comprises:
50-65 parts by weight of silica;
10-15 parts by weight of high alumina cement;
15-25 parts by weight of clay powder;
8-15 parts by weight of magnesium oxide;
the metal ions in the metal phosphate binder are one or more of aluminum ions, zinc ions, copper ions, iron ions, ferrous ions and calcium ions;
the mass ratio of the component A to the component B is (4-5): 1;
the thickness of the graphene oxide is 4-20 nm;
the graphene oxide micro-sheet size is 5-10 μm.
2. The normal-temperature-curing inorganic coating material as claimed in claim 1, wherein the particle size of the alumina is 20 to 40 μm.
3. A preparation method of a normal-temperature curing inorganic coating comprises the following steps:
A) mixing a metal compound with a phosphoric acid solution, and heating to obtain a metal phosphate binder;
B) mixing 33-42 parts by weight of aluminum oxide, 1-2 parts by weight of graphene oxide and 2-8 parts by weight of manganese dihydrogen phosphate, then carrying out ball milling, standing the ball-milled mixture for 20-30 hours after the ball milling is finished, and adding 50-65 parts by weight of metal phosphate binder to obtain a component A;
the rotating speed of the ball milling is 250-300 r/min;
the ball milling time is 5-10 hours;
C) mixing 50-65 parts by weight of silicon dioxide, 10-15 parts by weight of high alumina cement, 15-25 parts by weight of clay powder and 8-15 parts by weight of magnesium oxide to obtain a component B;
D) and mixing the component A and the component B to obtain the normal-temperature curing inorganic coating.
4. A coated workpiece comprises a metal substrate and a coating coated on the surface of the metal substrate;
the coating is obtained by curing the normal-temperature-curing inorganic coating of any one of claims 1 to 2 or the normal-temperature-curing inorganic coating prepared by the preparation method of claim 3 on the surface of the metal substrate at normal temperature.
5. The coated workpiece according to claim 4, wherein the coating has a thickness of 0.1 to 0.4 mm.
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