CN114192374A - Pretreatment method for improving adhesion of silicone rubber coating on surface of titanium alloy storage tank - Google Patents
Pretreatment method for improving adhesion of silicone rubber coating on surface of titanium alloy storage tank Download PDFInfo
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- CN114192374A CN114192374A CN202111108918.4A CN202111108918A CN114192374A CN 114192374 A CN114192374 A CN 114192374A CN 202111108918 A CN202111108918 A CN 202111108918A CN 114192374 A CN114192374 A CN 114192374A
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- storage tank
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- silicone rubber
- rubber coating
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- 229920002379 silicone rubber Polymers 0.000 title claims abstract description 43
- 238000010073 coating (rubber) Methods 0.000 title claims abstract description 41
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 35
- 239000004945 silicone rubber Substances 0.000 title claims abstract description 28
- 238000002203 pretreatment Methods 0.000 title claims abstract description 27
- 238000005507 spraying Methods 0.000 claims abstract description 68
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 44
- 239000004576 sand Substances 0.000 claims abstract description 40
- 239000011248 coating agent Substances 0.000 claims abstract description 38
- 238000000576 coating method Methods 0.000 claims abstract description 38
- 238000012360 testing method Methods 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000007664 blowing Methods 0.000 claims abstract description 23
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 17
- 239000010431 corundum Substances 0.000 claims abstract description 17
- 238000001035 drying Methods 0.000 claims abstract description 15
- 239000000758 substrate Substances 0.000 claims abstract description 15
- 239000003960 organic solvent Substances 0.000 claims abstract description 10
- 238000004140 cleaning Methods 0.000 claims abstract description 8
- 239000002904 solvent Substances 0.000 claims abstract description 6
- 229910052751 metal Inorganic materials 0.000 claims description 19
- 239000002184 metal Substances 0.000 claims description 19
- BTXFTCVNWMNXKH-UHFFFAOYSA-N NC1=CC=CC=C1.CCO[Si](C)(OCC)OCC Chemical compound NC1=CC=CC=C1.CCO[Si](C)(OCC)OCC BTXFTCVNWMNXKH-UHFFFAOYSA-N 0.000 claims description 11
- 239000003502 gasoline Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical group CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 2
- 238000002591 computed tomography Methods 0.000 description 22
- 230000000052 comparative effect Effects 0.000 description 13
- 239000000047 product Substances 0.000 description 13
- 239000011159 matrix material Substances 0.000 description 12
- 238000007689 inspection Methods 0.000 description 11
- 230000002411 adverse Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000007667 floating Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 239000003380 propellant Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N N-phenyl amine Natural products NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000002679 ablation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 125000001301 ethoxy group Chemical group [H]C([H])([H])C([H])([H])O* 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 125000000962 organic group Chemical group 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/002—Pretreatement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/544—No clear coat specified the first layer is let to dry at least partially before applying the second layer
-
- 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
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
- C09D183/08—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention provides a pretreatment method for improving the adhesion of a silicone rubber coating on the surface of a titanium alloy storage tank, which comprises the following steps: step 1, uniformly blowing sand for at least 1 time on a part to be sprayed of a storage box by using 40-60 meshes of corundum sand, wherein the sand blowing pressure is 0.3-0.4 MPa, and the sand blowing is ensured to be 100% covered; step 2, cleaning the surface of the product after sand blowing, cleaning the part of the product to be sprayed by adopting an organic solvent, and then drying; step 3, uniformly spraying the pretreatment agent on the part to be sprayed for at least 1 time, wherein the pretreatment agent is required to cover the surface of the part to be sprayed by 100%; and 4, naturally drying the pretreatment agent after spraying, ensuring that the solvent is completely volatilized, and then spraying the silicone rubber coating, wherein the sprayed storage tank meets the requirement of a hydraulic strength test, namely the storage tank is filled with water and is kept for 10min under the pressure of 4.7MPa, and after the test, the test coating is well adhered to the substrate without any bulge or falling phenomenon.
Description
Technical Field
The invention belongs to the technical field of spraying, and particularly relates to a pretreatment method for improving the adhesive force of a silicone rubber coating on the surface of a spherical conical titanium alloy storage tank, wherein the adhesive strength of the silicone rubber coating and a titanium matrix after pretreatment can meet the working condition requirements of products, namely, after a hydraulic strength test (the storage tank is filled with water and is kept under the pressure of 4.7MPa for 10min), the coating does not generate any bad phenomena such as bulging, falling and the like.
Background
A hot gas self-pressurization system is adopted in a certain liquid rocket engine, and high-temperature and high-pressure gas is used for pressurizing an air cavity, so that a metal diaphragm is deformed and overturned, and a propellant is extruded into a conveying pipeline. The long-time scouring of high-temperature gas can lead to the temperature rise of propellant in the storage tank, influence the combustion efficiency of the propellant and cause explosion under extreme conditions. Therefore, in order to reduce the heat transfer of the high-temperature fuel gas to the propellant and ensure the working temperature of the propellant, a silicon rubber heat-insulating coating with a certain thickness needs to be sprayed on the outer surface of the metal diaphragm of the storage tank and the inner surface of the air cavity shell.
Because the titanium alloy material belongs to easily passivated metal, the titanium alloy material is very easy to oxidize in the air, the surface energy of the oxidized titanium alloy material is higher, and a firm covalent bond can not be formed with the silicon rubber coating, so that the adhesion strength of the coating and a matrix is not enough. In addition, the silicon rubber coating is of a porous structure, under the working condition of 4.7MPa of water pressure, a large amount of water permeates to the film-substrate interface of the coating through micropores, the bonding state of the coating and a matrix is damaged, and the coating is more prone to bulge and fall off, so that the heat insulation performance of the coating is influenced, and the engine fails to work under severe conditions.
Through examining a large amount of data and consulting many enterprises, and developing verification tests by using simulation pieces, the existing titanium alloy surface spraying pretreatment process cannot meet the requirements of a product hydraulic strength test (water is filled in a storage tank, and the pressure is maintained for 10min under the pressure of 4.7 MPa).
Disclosure of Invention
In order to overcome the defects in the prior art, the inventor of the invention carries out intensive research and provides a pretreatment method for improving the adhesive force of a silicone rubber coating on the surface of a spherical conical titanium alloy storage tank, the surface of a substrate is roughened by adopting a sand blowing process, a proper pretreatment agent is prepared, the pretreatment agent can be used as a molecular bridge to connect an organic silicone rubber coating and a titanium alloy material, the water resistance of a film-substrate interface is improved, and the requirements of a product hydraulic strength test (the storage tank is filled with water and the pressure is maintained for 10min under the pressure of 4.7 MPa) are met, so that the invention is completed.
The technical scheme provided by the invention is as follows:
a pretreatment method for improving the adhesion of a silicone rubber coating on the surface of a spherical conical titanium alloy storage tank, wherein the spherical conical titanium alloy storage tank is used for a self-pressurization system of a liquid rocket engine, the working environment temperature reaches 300 ℃, the pressure reaches 4.7MPa, and the pretreatment method comprises the following steps:
step 1, uniformly blowing sand for at least 1 time on a part to be sprayed of a storage box by using 40-60 meshes of corundum sand, wherein the sand blowing pressure is 0.3-0.4 MPa, and the sand blowing is ensured to be 100% covered;
step 2, cleaning the surface of the product after sand blowing, cleaning the part of the product to be sprayed by adopting an organic solvent, and then drying;
step 3, uniformly spraying the pretreatment agent on the part to be sprayed for at least 1 time, wherein the pretreatment agent is required to cover the surface of the part to be sprayed by 100%;
and 4, naturally drying the pretreatment agent after spraying, ensuring that the solvent is completely volatilized, spraying the silicon rubber coating (such as TL-5 ablative heat insulation coating), wherein the sprayed storage tank meets the requirement of a hydraulic strength test, namely the storage tank is filled with water, the pressure is maintained for 10min under the pressure of 4.7MPa, and the test result shows that the coating is well adhered to the substrate without any bulge or falling phenomenon after the test.
The pretreatment method for improving the adhesion of the silicone rubber coating on the surface of the spherical conical titanium alloy storage tank, provided by the invention, has the following beneficial effects:
(1) the invention provides a pretreatment method for improving the adhesion of a silicone rubber coating on the surface of a spherical conical titanium alloy storage box, which belongs to a chemical treatment method.A pretreatment agent (aniline methyl triethoxysilane) has a plurality of different reaction groups, wherein an organic group (aniline methyl) can be chemically combined with an organic silicon rubber material; the hydrolytic group (ethoxy) can be combined with the titanium alloy and the oxide thereof to form a firm covalent bond, and the adhesion strength is improved by establishing a molecular bridge, so that the problem of weak adhesion of the silicon rubber coating of the titanium alloy material is effectively solved;
(2) the pretreatment agent (aniline methyl triethoxysilane) used in the pretreatment method for improving the adhesion of the silicone rubber coating on the surface of the spherical conical titanium alloy storage tank has aniline methyl hydrophobic groups and is insoluble in water, one of the advantages of the pretreatment method can greatly improve the water resistance of the coating, and meanwhile, a benzene ring is taken as a typical rigid structure, so that the pretreatment method has good thermal stability;
(3) the pretreatment method for improving the adhesive force of the silicone rubber coating on the surface of the spherical conical titanium alloy storage tank, provided by the invention, has the advantages of simplicity in operation, easiness in control, high efficiency, low cost, stable process and better repeatability;
(4) according to the pretreatment method for improving the adhesion of the silicone rubber coating on the surface of the spherical conical titanium alloy storage tank, the heat-insulating coating sprayed on the pretreated product is checked for many times, and the adhesion strength completely meets the requirements of a hydraulic strength test (the storage tank is filled with water and is kept for 10min under the pressure of 4.7 MPa);
(5) the pretreatment method for improving the adhesive force of the silicone rubber coating on the surface of the spherical conical titanium alloy storage box, provided by the invention, has strong applicability, and is particularly suitable for removing powder particles of complex cavities such as thin-walled interlayers, multiple inner cavities, narrow and small runners and the like.
Detailed Description
The features and advantages of the present invention will become more apparent and appreciated from the following detailed description of the invention.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
The invention provides a pretreatment method for improving the adhesive force of a silicone rubber coating on the surface of a spherical conical titanium alloy storage tank, wherein the spherical conical titanium alloy storage tank is used for a self-pressurization system of a liquid rocket engine, the working environment temperature reaches 300 ℃, the pressure reaches 4.7MPa, and the pretreatment method comprises the following steps:
step 1, uniformly blowing sand for at least 1 time on a part to be sprayed of a storage box by using 40-60 meshes of corundum sand, wherein the sand blowing pressure is 0.3-0.4 MPa, and the sand blowing is ensured to be 100% covered;
step 2, cleaning floating ash on the surface of the product after sand blowing by using a clean brush, cleaning the part of the product to be sprayed by dipping the brush in an organic solvent, and naturally drying to prevent oil stain residues on the surface;
step 3, uniformly spraying the pretreatment agent on the part to be sprayed for at least 1 time, wherein the pretreatment agent is required to cover the surface of the part to be sprayed by 100%;
and 4, naturally drying the pretreatment agent after spraying, ensuring that the solvent is completely volatilized, and then spraying the silicone rubber coating, wherein the sprayed storage tank meets the requirement of a hydraulic strength test, namely the storage tank is filled with water and is kept for 10min under the pressure of 4.7MPa, and after the test, the test results show that the coating is well adhered to the substrate without any adverse phenomena such as bulging, falling and the like.
In the present invention, the storage tank is a spherical conical titanium alloy storage tank, and the titanium alloy includes but is not limited to TC4, TC2, TA1, TA2, TA15 and the like. The parts to be sprayed are the outer surface of the metal diaphragm and the inner surface of the air cavity shell, the wall thickness of the metal diaphragm is 0.47 +/-0.03 mm, and the wall thickness of the air cavity shell is
In the step 1, uniformly blowing sand for 1 time on the part to be sprayed of the storage box by using 40-60 meshes of corundum sand.
In the step 1, the inventor carries out a great deal of research, and determines that 40-60-mesh corundum is adopted, and the sand blowing pressure is 0.3-0.4 MPa, which is selected by considering the surface roughening effect and the structural characteristics of the part to be sprayed. If the corundum sand granularity is too small and less than 40 meshes, the coarsening effect of the metal matrix is poor, the bonding effect of the coating and the matrix is influenced, and if the corundum sand granularity is too large and more than 60 meshes, the metal matrix is deformed, and the product performance is influenced; if the sand blowing pressure is too low and less than 0.3MPa, the coarsening effect of the metal matrix is poor, the bonding effect of the coating and the matrix is influenced, and if the sand blowing pressure is too high and more than 0.4MPa, the metal matrix is deformed, and the product performance is influenced.
In the step 2, the organic solvent is selected as the organic solvent in the silicon rubber coating. The organic solvent is 120# gasoline.
In the step 3, the pretreating agent is 5-10 wt% of aniline methyl triethoxysilane solution, and the solvent is absolute ethyl alcohol. Correspondingly, the pretreatment agent is uniformly sprayed on the part to be sprayed for 1 time. The pretreatment agent is selected, and the problem of weak adhesion of the silicon rubber coating made of the titanium alloy material can be effectively solved by combining the selected silicon rubber coating (TL-5 ablation heat insulation coating).
In the step 3, the pretreatment agent is sprayed upwards from the center of the bottom along the circumferential direction of the storage box, the spraying distance is controlled to be 100-150 mm, the spraying angle is not less than 75 degrees, the spraying angle refers to the included angle between the spraying direction and the tangent line of the part to be sprayed, and the spraying pressure is controlled to be 0.4-0.6 MPa.
The present inventors have conducted a great deal of process studies to determine the spray pattern of the above pretreatment agent. The spraying distance, the spraying angle and the spraying pressure have an important influence on the bonding strength of the pretreating agent on the inner surface of the storage tank. Because the organic coating is of a microporous structure, if each parameter is not in the range, the bonding strength of the coating is reduced, namely the bonding strength is separated from the value range, and the requirement of a product hydraulic strength test (the storage tank is filled with water, and the pressure is maintained for 10min under the pressure of 4.7 MPa) cannot be met.
And 4, naturally drying the pretreatment agent for 25-40 min after the pretreatment agent is sprayed.
Examples
Example 1
The external surface of a metal diaphragm (thickness of 0.47 +/-0.03 mm) of a spherical conical storage tank made of TA1 material and an air cavity shell (thickness of 0.47 +/-0.03 mm)
) The inner surface is uniformly blown with 40-mesh corundum under the pressure of 0.3MPa, and after floating sand is cleaned, the part to be sprayed is cleaned by clean 120# gasoline. After the mixture is completely dried, 5 percent (weight percent) of pretreatment agent (aniline methyl triethoxysilane solution) is sprayed on the inner surface of the storage tank from bottom to top along the circumferential direction, the spraying distance is controlled at 100mm, the spraying angle is not less than 75 degrees, and the spraying pressure is controlled at 0.4 MPa. And naturally drying the pretreatment agent for 25min after spraying, and then spraying the silicon rubber coating.
And (3) performing a hydraulic strength test on the sprayed storage tank (filling the storage tank with water, and maintaining the pressure for 10min at the pressure of 4.7 MPa), and then performing CT (computed tomography) inspection, wherein the coating is well adhered to the substrate, and the adverse phenomena of bulging, falling off and the like are avoided.
Example 2
The external surface of a metal diaphragm (thickness of 0.47 +/-0.03 mm) of a spherical conical storage tank made of TA1 material and an air cavity shell (thickness of 0.47 +/-0.03 mm)
) The inner surface is uniformly blown with 40-mesh corundum under the pressure of 0.3MPa, and after floating sand is cleaned, the part to be sprayed is cleaned by clean 120# gasoline. After the mixture is completely dried, 10 percent (weight percent) of pretreatment agent (aniline methyl triethoxysilane solution) is sprayed on the inner surface of the storage tank from bottom to top along the circumferential direction, the spraying distance is controlled at 150mm, the spraying angle is not less than 75 degrees, and the spraying pressure is controlled at 0.4 MPa. And (4) naturally drying the pretreatment agent after spraying for 40min, and then spraying the silicon rubber coating.
And (3) performing a hydraulic strength test on the sprayed storage tank (filling the storage tank with water, and maintaining the pressure for 10min at the pressure of 4.7 MPa), and then performing CT (computed tomography) inspection, wherein the coating is well adhered to the substrate, and the adverse phenomena of bulging, falling off and the like are avoided.
Example 3
The external surface of a metal diaphragm (thickness of 0.47 +/-0.03 mm) of a spherical conical storage tank made of TA1 material and an air cavity shell (thickness of 0.47 +/-0.03 mm)
) The inner surface is uniformly blown with 40-mesh corundum under the pressure of 0.3MPa, and after floating sand is cleaned, the part to be sprayed is cleaned by clean 120# gasoline. After the mixture is completely dried, 10 percent (weight percent) of pretreatment agent (aniline methyl triethoxysilane solution) is sprayed on the inner surface of the storage tank from bottom to top along the circumferential direction, the spraying distance is controlled at 100mm, the spraying angle is not less than 75 degrees, and the spraying pressure is controlled at 0.6 MPa. And naturally drying the pretreatment agent for 25min after spraying, and then spraying the silicon rubber coating.
And (3) performing a hydraulic strength test on the sprayed storage tank (filling the storage tank with water, and maintaining the pressure for 10min at the pressure of 4.7 MPa), and then performing CT (computed tomography) inspection, wherein the coating is well adhered to the substrate, and the adverse phenomena of bulging, falling off and the like are avoided.
Example 4
The external surface of a metal diaphragm (thickness of 0.47 +/-0.03 mm) of a spherical conical storage tank made of TA1 material and an air cavity shell (thickness of 0.47 +/-0.03 mm)
) The inner surface is uniformly blown with 40-mesh corundum under the pressure of 0.4MPa, and after floating sand is cleaned, the part to be sprayed is cleaned by clean 120# gasoline. After the mixture is completely dried, 5 percent (weight percent) of pretreatment agent (aniline methyl triethoxysilane solution) is sprayed on the inner surface of the storage tank from bottom to top along the circumferential direction, the spraying distance is controlled at 150mm, the spraying angle is not less than 75 degrees, and the spraying pressure is controlled at 0.4 MPa. And (4) naturally drying the pretreatment agent after spraying for 40min, and then spraying the silicon rubber coating.
And (3) performing a hydraulic strength test on the sprayed storage tank (filling the storage tank with water, and maintaining the pressure for 10min at the pressure of 4.7 MPa), and then performing CT (computed tomography) inspection, wherein the coating is well adhered to the substrate, and the adverse phenomena of bulging, falling off and the like are avoided.
Example 5
The external surface of a metal diaphragm (thickness of 0.47 +/-0.03 mm) of a spherical conical storage tank made of TA1 material and an air cavity shell (thickness of 0.47 +/-0.03 mm)
) The inner surface is uniformly blown with 40-mesh corundum under the pressure of 0.4MPa, and after floating sand is cleaned, the part to be sprayed is cleaned by clean 120# gasoline. After the mixture is completely dried, 10 percent (weight percent) of pretreatment agent (aniline methyl triethoxysilane solution) is sprayed on the inner surface of the storage tank from bottom to top along the circumferential direction, the spraying distance is controlled at 100mm, the spraying angle is not less than 75 degrees, and the spraying pressure is controlled at 0.6 MPa. And naturally drying the pretreatment agent for 25min after spraying, and then spraying the silicon rubber coating.
And (3) performing a hydraulic strength test on the sprayed storage tank (filling the storage tank with water, and maintaining the pressure for 10min at the pressure of 4.7 MPa), and then performing CT (computed tomography) inspection, wherein the coating is well adhered to the substrate, and the adverse phenomena of bulging, falling off and the like are avoided.
Example 6
The external surface of a metal diaphragm (thickness of 0.47 +/-0.03 mm) of a spherical conical storage tank made of TA1 material and an air cavity shell (thickness of 0.47 +/-0.03 mm)
) The inner surface is uniformly blown with 40-mesh corundum under the pressure of 0.4MPa, and after floating sand is cleaned, the part to be sprayed is cleaned by clean 120# gasoline. After the mixture is completely dried, 5 percent (weight percent) of pretreatment agent (aniline methyl triethoxysilane solution) is sprayed on the inner surface of the storage tank from bottom to top along the circumferential direction, the spraying distance is controlled at 150mm, the spraying angle is not less than 75 degrees, and the spraying pressure is controlled at 0.6 MPa. And (4) naturally drying the pretreatment agent after spraying for 40min, and then spraying the silicon rubber coating.
And (3) performing a hydraulic strength test on the sprayed storage tank (filling the storage tank with water, and maintaining the pressure for 10min at the pressure of 4.7 MPa), and then performing CT (computed tomography) inspection, wherein the coating is well adhered to the substrate, and the adverse phenomena of bulging, falling off and the like are avoided.
Comparative example
Comparative example 1
Comparative example 1 is identical to example 1, differing only in that: by adopting 20-mesh corundum sand and uniformly blowing sand under the pressure of 0.6MPa, the deformation of a metal matrix can be caused, the product performance is influenced, the safety risk exists, and the reliable work of the storage tank cannot be ensured.
Comparative example 2
Comparative example 2 is identical to example 1, differing only in that: by adopting 80-mesh corundum sand and uniformly blowing sand under the pressure of 0.2MPa, the coarsening effect of the metal matrix is poor, and the bonding effect of the coating and the matrix is influenced.
And (3) carrying out a hydraulic strength test (filling water in the storage tank, and keeping the pressure for 10min at the pressure of 4.7 MPa) on the sprayed storage tank, and then carrying out CT (computed tomography) inspection, wherein the bonding strength of the coating is low, and the risk of falling off exists.
Comparative example 3
Comparative example 3 is identical to example 1, differing only in that: when the pretreatment agent is sprayed, the spraying distance is controlled to be 50mm, the spraying angle is not less than 75 degrees, the spraying pressure is controlled to be 0.4MPa, the spraying range is small, the coating is gathered, the scattering difference is large, the polishing process is required to be added, and the bonding strength of the coating and the substrate is influenced.
And (3) carrying out a hydraulic strength test (filling water in the storage tank, and keeping the pressure for 10min at the pressure of 4.7 MPa) on the sprayed storage tank, and then carrying out CT (computed tomography) inspection, wherein the bonding strength of the coating is low, and the risk of falling off exists.
Comparative example 4
Comparative example 4 is identical to example 1, differing only in that: when the pretreatment agent is sprayed, the spraying distance is controlled to be 200mm, the spraying angle is not less than 75 degrees, the spraying pressure is controlled to be 0.6MPa, the spraying range is large, the uniformity is poor, the compactness of the coating is poor, and the performance of the coating is influenced.
And (3) carrying out a hydraulic strength test (filling water in the storage tank, and keeping the pressure for 10min at the pressure of 4.7 MPa) on the sprayed storage tank, and then carrying out CT (computed tomography) inspection, wherein the bonding strength of the coating is low, and the risk of falling off exists.
Comparative example 5
Comparative example 5 is identical to example 1, differing only in that: when the pretreatment agent is sprayed, the spraying distance is controlled at 100mm, the spraying angle is less than 75 degrees, the spraying pressure is controlled at 0.4MPa, the binding force between the coating and the substrate is weak, and the performance of the coating is influenced.
And (3) carrying out a hydraulic strength test (filling water in the storage tank, and keeping the pressure for 10min at the pressure of 4.7 MPa) on the sprayed storage tank, and then carrying out CT (computed tomography) inspection, wherein the bonding strength of the coating is low, and the risk of falling off exists.
Comparative example 6
Comparative example 6 is identical to example 1, differing only in that: the pretreatment agent was a silane coupling agent other than the aniline methyl triethoxysilane solution in example 1, and the coating was debonded by water immersion.
And (3) carrying out a hydraulic strength test on the sprayed storage tank (the storage tank is filled with water and is kept under the pressure of 4.7MPa for 10min), and then carrying out CT (computed tomography) inspection, wherein the coating partially or wholly falls off, so that the product is scrapped.
The invention has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to be construed in a limiting sense. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its embodiments without departing from the spirit and scope of the present invention, which fall within the scope of the present invention. The scope of the invention is defined by the appended claims.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (9)
1. A pretreatment method for improving the adhesion of a silicone rubber coating on the surface of a spherical conical titanium alloy storage tank is characterized in that the spherical conical titanium alloy storage tank is used for a self-pressurization system of a liquid rocket engine, the working environment temperature reaches 300 ℃, the pressure reaches 4.7MPa, and the pretreatment method comprises the following steps:
step 1, uniformly blowing sand for at least 1 time on a part to be sprayed of a storage box by using 40-60 meshes of corundum sand, wherein the sand blowing pressure is 0.3-0.4 MPa, and the sand blowing is ensured to be 100% covered;
step 2, cleaning the surface of the product after sand blowing, cleaning the part of the product to be sprayed by adopting an organic solvent, and then drying;
step 3, uniformly spraying the pretreatment agent on the part to be sprayed for at least 1 time, wherein the pretreatment agent is required to cover the surface of the part to be sprayed by 100%;
and 4, naturally drying the pretreatment agent after spraying, ensuring that the solvent is completely volatilized, and then spraying the silicone rubber coating, wherein the sprayed storage tank meets the requirement of a hydraulic strength test, namely the storage tank is filled with water and is kept for 10min under the pressure of 4.7MPa, and after the test, the test coating is well adhered to the substrate without any bulge or falling phenomenon.
2. The pretreatment method for improving the adhesion of the silicone rubber coating on the surface of the spherical conical titanium alloy storage tank according to claim 1, wherein in the step 1, the part to be sprayed of the storage tank is the outer surface of a metal diaphragm and the inner surface of an air cavity shell, the wall thickness of the metal diaphragm is 0.47 +/-0.03 mm, and the wall thickness of the air cavity shell is 0.47 +/-0.03 mm
3. The pretreatment method for improving the adhesion of the silicone rubber coating on the surface of the spherical conical titanium alloy storage tank according to claim 1, wherein in the step 1, corundum sand of 40-60 meshes is adopted to uniformly blow sand for 1 time on the part to be sprayed of the storage tank.
4. The pretreatment method for improving the adhesion of the silicone rubber coating on the surface of the spherical conical titanium alloy storage tank according to claim 1, wherein in the step 2, the organic solvent is selected from the same organic solvents in the silicone rubber coating.
5. The pretreatment method for improving the adhesion of the silicone rubber coating on the surface of the spherical conical titanium alloy storage tank according to claim 1, wherein in the step 2, the organic solvent is 120# gasoline.
6. The pretreatment method for improving the adhesion of the silicone rubber coating on the surface of the spherical conical titanium alloy tank as claimed in claim 1, wherein in step 3, the pretreatment agent is 5-10 wt% of aniline methyl triethoxysilane solution, and the solvent is absolute ethanol.
7. The pretreatment method for improving the adhesion of the silicone rubber coating on the surface of the spherical conical titanium alloy storage tank according to claim 1, wherein in the step 3, the pretreatment agent is uniformly sprayed on the part to be sprayed for 1 time.
8. The pretreatment method for improving the adhesion of the silicone rubber coating on the surface of the spherical conical titanium alloy storage tank according to claim 1, wherein in the step 3, the pretreatment agent is sprayed upwards from the center of the bottom along the circumferential direction of the storage tank, the spraying distance is controlled to be 100-150 mm, the spraying angle is not less than 75 degrees, the spraying angle is an included angle between the spraying direction and the tangent line of a part to be sprayed, and the spraying pressure is controlled to be 0.4-0.6 MPa.
9. The pretreatment method for improving the adhesion of the silicone rubber coating on the surface of the spherical conical titanium alloy storage tank according to claim 1, wherein in the step 4, the pretreatment agent is naturally dried for 25-40 min after being sprayed.
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| EP0798344A2 (en) * | 1996-03-29 | 1997-10-01 | Dow Corning Toray Silicone Company, Limited | Fluorosilicone rubber composition and method of adhering it to a substrate |
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| CN101885946A (en) * | 2010-07-16 | 2010-11-17 | 沈阳黎明航空发动机(集团)有限责任公司 | Preparation method for easy-abrasion silicone rubber coating |
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| EP0798344A2 (en) * | 1996-03-29 | 1997-10-01 | Dow Corning Toray Silicone Company, Limited | Fluorosilicone rubber composition and method of adhering it to a substrate |
| CN101255559A (en) * | 2008-02-25 | 2008-09-03 | 合肥华清金属表面处理有限责任公司 | Metal finishing agent using silane coupling agent as main component for metal surface pretreatment |
| CN101885946A (en) * | 2010-07-16 | 2010-11-17 | 沈阳黎明航空发动机(集团)有限责任公司 | Preparation method for easy-abrasion silicone rubber coating |
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