CN114149703A - Water-based anti-aluminizing coating and partial aluminizing modification method based on chemical vapor deposition - Google Patents

Water-based anti-aluminizing coating and partial aluminizing modification method based on chemical vapor deposition Download PDF

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Publication number
CN114149703A
CN114149703A CN202111383096.0A CN202111383096A CN114149703A CN 114149703 A CN114149703 A CN 114149703A CN 202111383096 A CN202111383096 A CN 202111383096A CN 114149703 A CN114149703 A CN 114149703A
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aluminizing
coating
water
powder
modification
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CN114149703B (en
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夏春怀
夏思瑶
孙清云
吴勇
段海涛
孟施旭
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Wuhan Research Institute of Materials Protection
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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
    • C09D1/02—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances alkali metal silicates
    • 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
    • C09D5/18—Fireproof paints including high temperature resistant 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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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
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  • Other Surface Treatments For Metallic Materials (AREA)
  • Chemically Coating (AREA)

Abstract

The invention discloses a water-based anti-aluminizing coating and a partial aluminizing modification method based on chemical vapor deposition. The aqueous anti-aluminizing paint has a simple formula, low production cost and a good protection effect, and an anti-aluminizing coating formed after the anti-aluminizing aqueous paint is brushed on the surface of a part does not wrinkle or sag at high temperature, has good adhesion and a thinner coating, and is convenient to clean.

Description

Water-based anti-aluminizing coating and partial aluminizing modification method based on chemical vapor deposition
Technical Field
The invention belongs to the technical field of metal surface modification by high-temperature chemical vapor deposition (HTCVD), relates to a high-temperature anti-seepage metal coating, and particularly relates to a water-based anti-aluminizing coating and a partial aluminizing modification method based on chemical vapor deposition.
Background
Some precise parts such as ships, power generation gas turbine turbines, aircraft engines and the like are made of high-temperature-resistant nickel (cobalt) -based alloy materials, and the metal surface aluminizing modification treatment needs to be carried out by adopting a high-temperature chemical vapor deposition (HTCVD) process. The part of the parts generally operates under the severe working conditions of high temperature and high speed, the oxidation resistance and the corrosion resistance of the surface of the part are improved after aluminizing modification, and the service life of the part is prolonged. Part parts do not need aluminizing modification, otherwise, part local performance is affected, high-temperature chemical vapor deposition is generally indifferent deposition, parts which do not need aluminizing modification need to be shielded in advance, a shielding coating is required to be capable of adapting to the temperature range of 700-1100 ℃ of a high-temperature chemical vapor deposition (HTCVD) aluminizing process, damage to the parts is not caused, and particularly, after the high-temperature chemical vapor deposition is finished, the shielding coating needs to be conveniently and quickly removed, so that the parts can be normally used.
The existing aluminum-impermeable coating on the market is mainly suitable for the embedding method and the gas-method aluminizing process, contains elements such as carbon, phosphorus, sulfur and the like, and has a thicker coating layer which can generate adverse effect on the surface of a part, so that the aluminum-impermeable coating aiming at the high-temperature chemical vapor deposition method needs to be developed.
The high-temperature chemical vapor deposition (HTCVD) aluminizing process has the temperature range of 700-1100 ℃, the precursor medium comprises carrier gas, reducing gas, promoting gas, active aluminizing agent and the like, the anti-aluminum-seepage water-based coating is designed for the high-temperature chemical vapor deposition aluminizing process, the coating has the characteristics of no toxicity, environmental protection and no carbon, phosphorus, sulfur and other elements which are harmful to the surface of a part, inorganic materials which are not easy to decompose in the aluminizing process are selected, the coating does not wrinkle and sag at high temperature, has good cohesiveness and is easy to peel off, the aluminizing configuration atmosphere is not influenced, and the coating is thin and easy to clean.
Disclosure of Invention
The invention provides an environment-friendly water-based aluminizing-resistant coating aiming at a high-temperature chemical vapor deposition (HTCVD) process, which does not contain carbon, phosphorus and sulfur elements which are unfavorable to the surface performance of parts, has good adhesive force to the surfaces of the parts, is easy to dry or dry by self, can not wrinkle or sag under high temperature conditions when being coated on the surfaces of the parts, has good cohesiveness, is not easy to decompose in the aluminizing process, does not influence aluminizing atmosphere, and is easy to spray water or blast for cleaning.
In order to solve the technical problems, the technical means adopted by the invention are as follows:
an aqueous anti-seepage aluminum coating for a high-temperature chemical vapor deposition process is characterized in that: is prepared by mixing quartz powder, corundum powder, titanium dioxide, shielding agent powder, liquid sodium silicate and water.
Preferably, the water-based anti-aluminizing coating comprises the following components in percentage by mass:
10.0-15.0% of quartz powder, 6.0-12.0% of corundum powder, 10.0-20.0% of titanium dioxide, 10.0-30.0% of shielding agent powder, 20.0-40.0% of liquid sodium silicate salt and the balance of deionized water.
Preferably, the particle size parameters of the quartz powder, the corundum powder, the titanium dioxide and the shielding agent powder are as follows: 400-600 meshes of quartz powder, 400-600 meshes of corundum powder, 400-600 meshes of titanium dioxide and 400-600 meshes of shielding agent powder.
Preferably, the modulus of the liquid sodium silicate salt is 2.2-2.6.
Preferably, the shielding agent powder is chromium-nickel alloy powder.
Preferably, the chromium-nickel alloy powder contains 40.0-60.0% of metal chromium.
Preferably, the content of metallic chromium in the chromium-nickel alloy powder is 50.0%.
Preferably, the viscosity of the water-based anti-aluminizing coating is 35 s-60 s after the components are uniformly mixed and stirred, and the viscosity can be well filmed.
A partial aluminizing modification method by using the water-based anti-aluminum-seepage coating is characterized by comprising the following steps:
step 1, according to the composition of the water-based anti-seepage aluminum coating, fully mixing all the components, and uniformly stirring for later use;
step 2, cleaning the surface of the part to be modified;
step 3, coating the water-based anti-seepage aluminum coating prepared in the step 1 on the area of the part which does not need aluminizing modification;
step 4, drying the part coated with the water-based anti-aluminizing coating in the step 3 in a drying oven to form an anti-aluminizing coating;
step 5, aluminizing and modifying the dried part according to a high-temperature chemical vapor deposition process; the temperature of the aluminizing process can be continuously regulated and controlled between 700 and 1100 ℃.
Step 6, knocking the anti-seepage aluminum coating by using a soft material to peel off after the aluminizing modification is finished;
and 7, removing the residual anti-seepage aluminum coating by adopting a water spraying or sand blasting process to finish the partial aluminizing modification processing of the part.
Preferably, in the step 1, the mixture is uniformly stirred for about 20 to 30 minutes, and the viscosity of the coating is detected to be between 35s and 60 s.
Preferably, in step 2, the cleaning comprises degreasing and descaling.
Preferably, in the step 3, the painting thickness of the water-based anti-aluminizing coating is 0.3-0.6 mm, and the painting mode is painting or spraying.
Preferably, in the step 4, the drying temperature is 110-130 ℃.
Preferably, in step 6, the impermeable aluminum coating can be peeled off by tapping with a rubber rod.
Preferably, in the step 7, the water spraying pressure is 0.4-0.6 MPa (if sand blasting is adopted, the sand blasting pressure is 0.2-0.3 MPa, and the corundum sand is 120-180 meshes), the distance between the nozzle and the surface is 8-12 cm, and the included angle between the incident direction and the surface is 15-30 degrees.
The invention has the following beneficial effects:
the water-based anti-aluminizing coating disclosed by the invention does not contain elements such as carbon, phosphorus, sulfur and the like which can generate adverse effects on the surface of the part, the coating can resist the high temperature of a high-temperature chemical vapor deposition process, the subsequent peeling is easy, and the surface of the part is not lost. The partial aluminizing modification method can carry out local selective aluminizing modification on the part, greatly reduces the influence of the aluminizing modification on the part performance, and improves the application range of the aluminizing modification.
Drawings
FIG. 1 shows the appearance of a test piece (100X 50) of the present invention after the right side is painted with a water-based anti-aluminizing paint, aluminized by a high temperature chemical vapor deposition process, and washed with the water-based anti-aluminizing paint.
FIG. 2 shows that the sample of the part is not coated with the water-based anti-seepage aluminum coating, and the microscopic metallographic structure is observed after the aluminizing treatment by the high-temperature chemical vapor deposition process, wherein the left side is the metallographic structure inside the sample, the middle narrow band is an aluminized layer, and the right side is an inlay material for embedding the sample.
FIG. 3 shows that in the embodiment of the present invention, a sample of a part is coated with an aqueous anti-seepage aluminum coating, and is subjected to aluminizing treatment by a high temperature chemical vapor deposition process, and then a microscopic metallographic structure is observed, wherein the left side is an internal metallographic structure of the sample, and the right side is an inlay material for embedding the sample, and the sample is well defined and has no aluminized layer.
Detailed Description
The invention will be better understood by those skilled in the art from the following examples, which are set forth to illustrate the invention in further detail.
Example 1
The invention relates to a water-based anti-aluminizing coating for a high-temperature chemical vapor deposition process, which is prepared from the following components in parts by mass: 12.0 percent of quartz powder, 600 meshes, 10.0 percent of corundum powder, 600 meshes, 20.0 percent of titanium dioxide, 600 meshes, 20.0 percent of shielding agent powder (chromium-nickel alloy powder), 500 meshes, 30.0 percent of liquid sodium silicate, 2.6 percent of modulus and the balance of deionized water (8 percent).
The partial aluminizing modification method by using the water-based anti-seepage aluminum coating comprises the following steps:
step 1, according to the composition of the water-based anti-seepage aluminum coating, fully mixing all the components, and uniformly stirring for later use; stirring evenly for about 25 minutes, and detecting the viscosity of the coating to be 40-50 s.
Step 2, cleaning the surface of the part to be modified; the cleaning comprises degreasing and descaling treatment.
Step 3, coating the water-based anti-seepage aluminum coating prepared in the step 1 on the area of the part which does not need aluminizing modification; the brushing thickness of the water-based anti-aluminizing coating is 0.3-0.6 mm, and the brushing mode is brushing.
Step 4, drying the part coated with the water-based anti-aluminizing coating in the step 3 in a drying oven to form an anti-aluminizing coating;
step 5, aluminizing and modifying the dried part according to a high-temperature chemical vapor deposition process; the temperature of the aluminizing process can be continuously regulated and controlled between 700 and 1100 ℃.
Step 6, after the aluminizing modification is finished, tapping the anti-seepage aluminum coating by using a rubber rod to peel off the anti-seepage aluminum coating;
and 7, removing the residual anti-seepage aluminum coating by adopting a water spraying or sand blasting process to finish partial aluminizing modification processing of the part, wherein the water spraying pressure is 0.4-0.6 MPa, the distance between a nozzle and the surface is 8-12 cm, and the included angle between the incident direction and the surface is 15-30 degrees.
Example 2
The invention relates to a water-based anti-aluminizing coating for a high-temperature chemical vapor deposition process, which is prepared from the following components in parts by mass: 10.0 percent of quartz powder, 400 meshes, 8.0 percent of corundum powder, 400 meshes, 15.0 percent of titanium dioxide, 400 meshes, 25.0 percent of shielding agent powder (chromium-nickel alloy powder), 400 meshes, 36.0 percent of liquid sodium silicate salt, 2.3 percent of modulus and the balance of deionized water (6 percent). The viscosity of the coating is detected to be 50 s-60 s.
The partial aluminizing modification method was the same as in example 1.
Example 3
The invention relates to a water-based anti-aluminizing coating for a high-temperature chemical vapor deposition process, which is prepared from the following components in parts by mass: 15.0 percent of quartz powder, 400 meshes, 10.0 percent of corundum powder, 400 meshes, 10.0 percent of titanium dioxide, 400 meshes, 15.0 percent of shielding agent powder (chromium-nickel alloy powder), 400 meshes, 40.0 percent of liquid sodium silicate salt, 2.3 percent of modulus and the balance of deionized water (10 percent). The viscosity of the coating is detected to be 35 s-45 s.
The partial aluminizing modification method was the same as in example 1.
The water-based anti-aluminizing paint in the embodiment is coated on the upper part of the test piece (100 x 50) according to the steps in the partial aluminizing modification method, and is subjected to high-temperature chemical vapor deposition (HTCVD) aluminizing treatment, and the appearance state after the water-based anti-aluminizing paint is cleaned, as shown in FIG. 1, the surface of the original part is presented with the body color, and the original appearance is kept.
The sample is not coated with the water-based anti-aluminizing coating, and the microscopic metallographic structure is observed after the sample is subjected to high-temperature chemical vapor deposition (HTCVD) aluminizing treatment, wherein the left side is the metallographic structure inside the sample, the middle narrow band is an aluminized layer, and the right side is an inlay material for inlaying the sample as shown in figure 2.
And (3) coating the sample with the water-based anti-seepage aluminum coating, carrying out high-temperature chemical vapor deposition (HTCVD) aluminizing treatment, and observing a microscopic metallographic structure, wherein the left side is the metallographic structure in the sample, the right side is an inlay material for embedding the sample, and the microscopic metallographic structure is well defined and has no aluminized layer as shown in figure 3.
The above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.

Claims (10)

1. An aqueous anti-seepage aluminum coating for a high-temperature chemical vapor deposition process is characterized in that: is prepared by mixing quartz powder, corundum powder, titanium dioxide, shielding agent powder, liquid sodium silicate and water.
2. The aqueous alumetizing-resistant coating according to claim 1, characterized in that: the water-based anti-aluminizing coating comprises the following components in percentage by mass:
10.0-15.0% of quartz powder, 6.0-12.0% of corundum powder, 10.0-20.0% of titanium dioxide, 10.0-30.0% of shielding agent powder, 20.0-40.0% of liquid sodium silicate salt and the balance of deionized water.
3. The aqueous aluminum barrier coating according to claim 1 or 2, characterized in that: the granularity parameters of the quartz powder, the corundum powder, the titanium dioxide and the shielding agent powder are as follows: 400-600 meshes of quartz powder, 400-600 meshes of corundum powder, 400-600 meshes of titanium dioxide and 400-600 meshes of shielding agent powder.
4. The aqueous aluminum barrier coating according to claim 1 or 2, characterized in that: the modulus of the liquid sodium silicate salt is 2.2-2.6.
5. The aqueous aluminum barrier coating according to claim 1 or 2, characterized in that: the shielding agent powder is chromium-nickel alloy powder.
6. The aqueous alumetizing-resistant coating according to claim 5, characterized in that: the chromium-nickel alloy powder contains 40.0-60.0% of metal chromium.
7. The aqueous aluminum barrier coating according to claim 1 or 2, characterized in that: the viscosity of the water-based anti-aluminizing coating is 35 s-60 s after all components are mixed and stirred uniformly.
8. A partial aluminizing modification method using the aqueous aluminum barrier coating according to any one of claims 1 to 7, comprising the following steps:
step 1, according to the composition of the water-based anti-seepage aluminum coating, fully mixing all the components, and uniformly stirring for later use;
step 2, cleaning the surface of the part to be modified;
step 3, coating the water-based anti-seepage aluminum coating prepared in the step 1 on the area of the part which does not need aluminizing modification;
step 4, drying the part coated with the water-based anti-aluminizing coating in the step 3 in a drying oven to form an anti-aluminizing coating;
step 5, aluminizing and modifying the dried part according to a high-temperature chemical vapor deposition process;
step 6, knocking the anti-seepage aluminum coating by using a soft material to peel off after the aluminizing modification is finished;
and 7, removing the residual anti-seepage aluminum coating by adopting a water spraying or sand blasting process to finish the partial aluminizing modification processing of the part.
9. The method of partial aluminizing modification of claim 8, wherein: in the step 3, the coating thickness of the water-based anti-aluminizing coating is 0.3-0.6 mm.
10. The method of partial aluminizing modification of claim 8, wherein: in the step 4, the drying temperature is 110-130 ℃.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115505284A (en) * 2022-10-28 2022-12-23 武汉两仪材料有限公司 Nitrogen-seepage-preventing coating and preparation and application thereof
CN115815077A (en) * 2023-02-06 2023-03-21 江苏源清动力技术有限公司 Anti-seepage process for coating of aero-engine blade

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN115505284A (en) * 2022-10-28 2022-12-23 武汉两仪材料有限公司 Nitrogen-seepage-preventing coating and preparation and application thereof
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CN115815077A (en) * 2023-02-06 2023-03-21 江苏源清动力技术有限公司 Anti-seepage process for coating of aero-engine blade

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