CN117483213A - Preparation method of acid salt spray corrosion resistant aluminum alloy plate fin heat exchanger - Google Patents
Preparation method of acid salt spray corrosion resistant aluminum alloy plate fin heat exchanger Download PDFInfo
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- CN117483213A CN117483213A CN202311347509.9A CN202311347509A CN117483213A CN 117483213 A CN117483213 A CN 117483213A CN 202311347509 A CN202311347509 A CN 202311347509A CN 117483213 A CN117483213 A CN 117483213A
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- acid salt
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- 238000005260 corrosion Methods 0.000 title claims abstract description 50
- 230000007797 corrosion Effects 0.000 title claims abstract description 50
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 45
- 239000007921 spray Substances 0.000 title claims abstract description 35
- 150000003839 salts Chemical class 0.000 title claims abstract description 34
- 239000002253 acid Substances 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000003973 paint Substances 0.000 claims abstract description 58
- 238000007598 dipping method Methods 0.000 claims abstract description 42
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000002161 passivation Methods 0.000 claims abstract description 19
- 239000004593 Epoxy Substances 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 17
- 239000002966 varnish Substances 0.000 claims description 10
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 8
- 238000001816 cooling Methods 0.000 description 7
- 230000017525 heat dissipation Effects 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 238000005406 washing Methods 0.000 description 7
- 229910001069 Ti alloy Inorganic materials 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000005507 spraying Methods 0.000 description 5
- 239000011651 chromium Substances 0.000 description 4
- 238000005238 degreasing Methods 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000009736 wetting Methods 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 150000008043 acidic salts Chemical class 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000003085 diluting agent Substances 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000013022 venting Methods 0.000 description 2
- JHWIEAWILPSRMU-UHFFFAOYSA-N 2-methyl-3-pyrimidin-4-ylpropanoic acid Chemical compound OC(=O)C(C)CC1=CC=NC=N1 JHWIEAWILPSRMU-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000013095 identification testing Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 229910000162 sodium phosphate Inorganic materials 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/34—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
- C23C22/37—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides containing also hexavalent chromium compounds
-
- 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
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
-
- 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
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
- B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with intermediate treatment
-
- 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
- B05D7/16—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 using synthetic lacquers or varnishes
-
- 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
-
- 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
- B05D2202/00—Metallic substrate
- B05D2202/20—Metallic substrate based on light metals
- B05D2202/25—Metallic substrate based on light metals based on Al
-
- 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
- B05D2350/00—Pretreatment of the substrate
- B05D2350/20—Chromatation
-
- 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
- B05D2501/00—Varnish or unspecified clear coat
-
- 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
- B05D2504/00—Epoxy polymers
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a preparation method of an aluminum alloy plate-fin heat exchanger resistant to acid salt spray corrosion. A, carrying out chromate passivation treatment on an air cavity of an aluminum alloy plate-fin heat exchanger; B. and (3) carrying out paint dipping treatment on the surface of the air cavity subjected to chromate passivation treatment. The invention can improve the acid salt fog resistance of the aluminum alloy plate fin heat exchanger.
Description
Technical Field
The invention belongs to the technical field of corrosion protection of aircraft accessories, and particularly relates to a preparation method of an acid salt mist corrosion resistant aluminum alloy plate fin heat exchanger.
Background
With the increase of the application demands of the aircraft in marine environments, the marine climate resistance capability of the aircraft mating accessories becomes the key of examination, and the air cavities of the air-air heat exchanger, the air-lubricating oil heat exchanger and the air-liquid heat exchanger which take air as media are directly contacted with marine atmosphere with high humidity, high salinity or high pH value, are most severely affected by acidic salt mist and acidic atmosphere, and the penetrable corrosion of the heat exchange partition plate directly causes the serial leakage of the cold cavity and the hot cavity of the heat exchanger, thereby seriously affecting the service life of products, the attendance rate of the aircraft and the flight safety. The traditional aircraft heat exchanger is mainly made of aluminum alloy materials at present and has the advantages of low density, high heat conductivity coefficient, easy processing of parts, high welding maturity of heat exchange cores and the like; but it is poorly corrosion resistant and therefore poorly adaptable to the marine environment (see fig. 2, 3). If the heat exchanger is made of titanium alloy and stainless steel with better corrosion resistance, the size and weight of the aircraft heat exchanger are obviously increased compared with those of the aluminum alloy heat exchanger under the same heat exchange capability due to high material density and low heat conductivity coefficient (the heat conductivity coefficient density ratio of the aluminum alloy material is 15.7 times that of the titanium alloy and 32 times that of the stainless steel at 100 ℃), and the aircraft performance is influenced.
Disclosure of Invention
The purpose of the invention is that: provides a preparation method of an aluminum alloy plate-fin heat exchanger resistant to acid salt spray corrosion. The invention can improve the acid salt fog resistance of the aluminum alloy plate fin heat exchanger.
The technical scheme of the invention is as follows: the preparation method of the aluminum alloy plate-fin heat exchanger resistant to acid salt spray corrosion is characterized by comprising the following steps of:
A. chromate passivation is carried out on an air cavity of the aluminum alloy plate fin heat exchanger;
B. and (3) carrying out paint dipping treatment on the surface of the air cavity subjected to chromate passivation treatment.
In the preparation method of the acid salt spray corrosion resistant aluminum alloy plate-fin heat exchanger, the chromate passivation treatment is as follows: immersing the heat exchanger in Na of 40-70 g/L at 35-45 DEG C 2 Cr 2 O 7 ·2H 2 O and 1-2 ml/L hydrofluoric acid, taking out after 1-5 min, and cleaning and drying the surface.
In the preparation method of the acid salt spray corrosion resistant aluminum alloy plate fin heat exchanger, the paint dipping treatment comprises primer dipping treatment and finish dipping treatment; the primer dipping treatment comprises the following steps:
B11. immersing: immersing the heat exchanger after chromate passivation treatment into H06-1012H epoxy primer at the speed of 200-300 mm/min;
B12. dipping paint: respectively rotating the immersed heat exchanger clockwise and anticlockwise for 1min according to a rotation rate of 1-3 r/min, and then keeping still for 1min;
B13. lifting: extracting H06-1012H epoxy primer from the heat exchanger at the speed of 200-300 mm/min;
B14. and (3) paint throwing: centrifuging and throwing paint for 2min according to a rotation rate of 60-100 r/min;
B15. and (5) drying.
In the preparation method of the acid salt spray corrosion resistant aluminum alloy plate-fin heat exchanger, the steps of the finishing paint dipping treatment are as follows:
B21. immersing: immersing the heat exchanger subjected to primer dipping treatment into 881-H02 epoxy varnish at a speed of 200-300 mm/min;
B22. dipping paint: respectively rotating the immersed heat exchanger clockwise and anticlockwise for 1min according to a rotation rate of 1-3 r/min, and then keeping still for 1min;
B23. lifting: extracting 881-H02 epoxy varnish from the heat exchanger at a rate of 200-300 mm/min;
B24. and (3) paint throwing: centrifuging and throwing paint for 2min according to a rotation rate of 60-100 r/min;
B25. and (5) drying.
In the preparation method of the aluminum alloy plate-fin heat exchanger resistant to acid salt spray corrosion, the step of impregnating the paint is repeated for 2-3 times, the immersing direction is reversed up and down after each time of impregnating the paint, and then the next time of impregnating the paint is carried out.
In the preparation method of the aluminum alloy plate-fin heat exchanger resistant to acid salt spray corrosion, the step of primer dipping treatment is repeated for 2-4 times.
In the preparation method of the aluminum alloy plate-fin heat exchanger resistant to acid salt spray corrosion, the viscosity of the H06-1012H epoxy primer coating-4 is 15-17 s.
In the preparation method of the aluminum alloy plate-fin heat exchanger resistant to acid salt spray corrosion, the viscosity of the 881-H02 epoxy varnish coated on-4 is 22-25 s.
In the preparation method of the aluminum alloy plate-fin heat exchanger resistant to acid salt spray corrosion, the heat exchanger is subjected to precise corrosion before chromate passivation treatment, and the process is as follows:
immersing the heat exchanger in the precision corrosion solution for not more than 30s; the precise corrosion solution comprises 20-35 g/L sulfuric acid H 2 SO 4 135-160 g/L CrO 3 Cr of not more than 30g/L 2 O 3 。
The invention has the advantages that: according to the invention, chromate passivation treatment is carried out on the aluminum alloy plate fin heat exchanger, then 2-4 times of primer dipping and 1 time of finish dipping treatment are carried out on the heat exchanger air cavity which is directly contacted with marine climate, and an insulating barrier with a chromate passivation treatment layer, a primer layer and a finish layer is formed between the air side fin or a baffle plate and corrosive environments such as acid salt spray and acid atmosphere to prevent corrosion, so that the acid salt spray resistance of the aluminum alloy plate fin heat exchanger is effectively improved.
When a neutral salt spray test with PH=6.5-7.2 is carried out on the aluminum alloy plate fin heat exchanger without corrosion protection treatment, the two states of spraying salt spray for 24 hours and drying for 24 hours are alternately carried out for 96 hours (2 spray wetting stages and 2 drying stages), and then the fin corrosion air holes and baffle plate spots of the heat exchanger are corroded, so that a cold-hot two-cavity airtight test string leaks; when the acid salt spray test with PH=3.5+/-0.5 is carried out on the aluminum alloy plate fin heat exchanger subjected to chromate passivation treatment, after 192h (4 spray wetting stages and 4 drying stages) are alternately carried out on two states of 24h spraying salt spray and 24h drying, corrosion fracture and partition penetrating corrosion of the heat exchanger air cavity fin occur, and cold and hot two-cavity airtight test serial leakage occurs; when an acidic salt spray test with PH=3.5+/-0.5 is carried out on a certain aluminum cooling device treated by the method, 384 hours (8 spray wetting stages and 8 drying stages) are alternately carried out through two states of 24 hours of spraying salt spray and 24 hours of drying, and the appearance of the device is still good and the air tightness is qualified; the corrosion resistance and the protection capability are obviously improved.
In addition, after corrosion protection treatment according to the method of the invention, the heat dissipation performance of the aluminum alloy air lubricating oil cooling device is reduced by less than 1% compared with the heat dissipation performance before treatment (the heat dissipation performance test results before corrosion protection are shown in table 1, the heat dissipation performance test results after corrosion protection are shown in table 2, and the influence of the corrosion protection on the heat dissipation performance is basically negligible within a certain margin.
TABLE 1 test data for heat dissipation performance of a product before paint dipping
TABLE 2 test data for heat dissipation performance of a product after paint dipping
Compared with the traditional paint spraying process, the method can realize the preparation of the paint film on the surface of the air special-shaped flow channels such as the corrugated fins, the zigzag fins and the like or the long flow channel cavity limited by the paint spraying process.
Thermal physical parameters of common materials for heat sinks: the density of the aluminum alloy 3A21-O is 2730kg/m 3 The heat conductivity coefficient at 100 ℃ is 180W/(m.k), and the density of the stainless steel 1Cr18Ni9 is 7920kg/m 3 The heat conductivity at 100 ℃ was 16.3W/(m.k), and the density of the titanium alloy TA1 was 4500kg/m 3 The heat conductivity coefficient at 100 ℃ is 18.9W/(m.k), and the heat conductivity density ratio of the aluminum alloy material at 100 ℃ is 15.7 times that of the titanium alloy and 32 times that of the stainless steel. Under the conditions of realizing the same corrosion resistance and the same heat exchange capacity, the weight of the aluminum alloy cooling device can be reduced by 40 percent compared with that of the titanium alloy cooling device; under the same weight index, the heat exchange capacity of the aluminum alloy cooling device can be improved by 30 percent compared with that of the titanium alloy cooling device, the aluminum alloy cooling device has the advantages of light weight and high efficiency, has important significance for the design of the engine with high power-to-weight ratio, and can be applied to the field of tubular heat exchangers with air cavities directly exposed to acidic atmosphere.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a graph of a corrosive leakage condition of a spacer in an aluminum alloy air-lubricant radiator identification test;
FIG. 3 shows the corrosion fracture of a fin after the external field of an air-oil cooler is used.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not intended to be limiting.
Example 1. A preparation method of an acid salt spray corrosion resistant aluminum alloy plate-fin heat exchanger comprises the following steps:
a) Chromate passivation is carried out on an air cavity of the aluminum alloy plate fin heat exchanger;
b) And (3) carrying out paint dipping treatment on the surface of the air cavity subjected to chromate passivation treatment.
Specifically, the chromate passivation treatment steps are as follows:
a) Chemical degreasing of the aluminum alloy plate-fin heat exchanger, and degreasing solution components: 40-50 g/L sodium phosphate Na 3 PO 4 ·12H 2 O, 40-50 g/L sodium carbonate Na 3 CO 3 ·10H 2 O; degreasing temperature: 60-85 ℃ and degreasing time is 3-5 min;
b) Washing with hot water: washing with hot water at 50-80 deg.c for 2-5 min;
c) And (3) cold water washing: washing for 1-3 min at room temperature to ensure that the continuous time of the water film is longer than 30 seconds;
d) And (3) light emitting: nitric acid HNO with room temperature of 300-500 g/L 3 (ρ=1.42 g/ml), washing for 1-3 min, repeating step c) of cold water washing;
e) Precision corrosion: the components of the precise corrosion solution are as follows: sulfuric acid H of 20-35 g/L 2 SO 4 Chromic anhydride CrO of 135-160 g/L 3 Chromium oxide Cr less than or equal to 30g/L 2 O 3 The method comprises the steps of carrying out a first treatment on the surface of the The treatment time is less than 0.5min; repeating steps b), c), d);
f) And (3) chromate passivation: the solution comprises the following components: 40-70 g/L sodium dichromate Na 2 Cr 2 O 7 ·2H 2 O, 1-2 ml/L hydrofluoric acid; the temperature is 35-45 ℃, the treatment time is 1-5 min, the cold water washing in the step c) is repeated, and finally the drying is carried out for 60-80 min at 60-90 ℃.
And (3) paint dipping treatment: the viscosity of the H06-1012H epoxy primer and the viscosity of the 881-H02 epoxy varnish are respectively prepared by using an X-7 epoxy paint diluent, the flowing time is measured by using a coating-4 viscometer, so that the coating-4 viscosity of the primer is 15-17 s, and the coating-4 viscosity of the finish paint is 22-25 s, if the viscosity is higher, the surface tension of paint liquid is overlarge, the fin parts are adhered, and the air cavity flow channels are blocked; conversely, the paint film is too thin to achieve the purpose of salt spray corrosion resistance; the viscosity of the paint was adjusted with an X-7 epoxy paint diluent during formulation and the viscosity of the formulated paint was recorded.
Specifically, primer dipping treatment:
a) Preparing H06-1012H epoxy primer, fixing a product by using a fixture, and simultaneously taking care of protecting a cavity and a part which are not subjected to paint dipping;
b) Immersing, namely completely immersing the product into H06-1012H epoxy primer paint liquid with the prepared viscosity at the speed of 200-300 mm/min; too fast a rate to facilitate venting;
c) Dipping paint, namely rotating clockwise for 1 minute and anticlockwise for 1 minute in a tank filled with H06-1012H epoxy primer with prepared viscosity, standing for 1 minute at a rotation rate of 1-3 revolutions per minute, and repeating for 2-3 times to ensure that the product is fully and uniformly coated with paint;
d) Lifting, namely lifting the product out of the paint liquid according to the speed of 200-300 mm/min;
e) Centrifugal paint throwing is carried out for 2 minutes according to the speed of 60-100 revolutions per minute, the rotating speed is too slow, the excessive paint liquid is not thrown out, the design difficulty of the clamping tool is increased when the rotating speed is too fast, and the adhesion of a paint layer is not facilitated;
f) Drying in an oven at 50 ℃ for 1h;
g) Repeating the steps a) to f) for 2 to 4 times of primer dipping, wherein the dipping direction is inverted up and down for each time of primer dipping, and drying for 8 to 10 hours at 50 ℃ in an oven after finishing the final primer dipping.
And (3) finishing paint dipping treatment:
h) Preparing a top-coat 881-H02 epoxy varnish, fixing a product by using a fixture, and simultaneously taking care of protecting a cavity and a part which are not subjected to paint dipping;
i) Immersing, namely immersing the product into 881-H02 epoxy varnish finishing paint liquid with the prepared viscosity at the speed of 200-300 mm/min. Too fast a rate does not facilitate venting.
j) Dipping paint, namely clockwise rotating for 1 minute, anticlockwise rotating for 1 minute, rotating at a speed of 1 revolution per minute and standing for 1 minute in a 881-H02 epoxy varnish finishing paint tank with prepared viscosity, and repeating the steps for 2-3 times to ensure that the product is fully and uniformly coated with paint;
k) Lifting, namely lifting the product out of the paint liquid according to the speed of 200-300 mm/min;
l) paint throwing, namely centrifuging paint throwing for 2 minutes at the speed of 60-100 rpm;
m) drying in a drying oven at 50 ℃ for 8-10 h.
In the treatment process, the porosity and equivalent diameter of the windward side of the plate-fin radiator influence the paint dipping effect, and the larger the porosity and equivalent diameter is, the more favorable the paint dipping is.
The method is also suitable for corrosion protection of the exposed air cavity of the tube array heat exchanger.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think about various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered in the scope of the present invention.
Claims (9)
1. The preparation method of the aluminum alloy plate-fin heat exchanger resistant to acid salt spray corrosion is characterized by comprising the following steps of:
A. chromate passivation is carried out on an air cavity of the aluminum alloy plate fin heat exchanger;
B. and (3) carrying out paint dipping treatment on the surface of the air cavity subjected to chromate passivation treatment.
2. The method for manufacturing an acid salt spray corrosion resistant aluminum alloy plate-fin heat exchanger according to claim 1, wherein the chromate passivation treatment is as follows: immersing the heat exchanger in Na of 40-70 g/L at 35-45 DEG C 2 Cr 2 O 7 ·2H 2 O and 1-2 ml/L hydrofluoric acid, taking out after 1-5 min, and cleaning and drying the surface.
3. The method for manufacturing an acid salt spray corrosion resistant aluminum alloy plate-fin heat exchanger according to claim 1, wherein the paint dipping treatment comprises a primer dipping treatment and a top dipping treatment; the primer dipping treatment comprises the following steps:
B11. immersing: immersing the heat exchanger after chromate passivation treatment into H06-1012H epoxy primer at the speed of 200-300 mm/min;
B12. dipping paint: respectively rotating the immersed heat exchanger clockwise and anticlockwise for 1min according to a rotation rate of 1-3 r/min, and then keeping still for 1min;
B13. lifting: extracting H06-1012H epoxy primer from the heat exchanger at the speed of 200-300 mm/min;
B14. and (3) paint throwing: centrifuging and throwing paint for 2min according to a rotation rate of 60-100 r/min;
B15. and (5) drying.
4. The method for manufacturing an acid salt spray corrosion resistant aluminum alloy plate-fin heat exchanger according to claim 3, wherein the step of impregnating a finish paint is as follows:
B21. immersing: immersing the heat exchanger subjected to primer dipping treatment into 881-H02 epoxy varnish at a speed of 200-300 mm/min;
B22. dipping paint: respectively rotating the immersed heat exchanger clockwise and anticlockwise for 1min according to a rotation rate of 1-3 r/min, and then keeping still for 1min;
B23. lifting: extracting 881-H02 epoxy varnish from the heat exchanger at a rate of 200-300 mm/min;
B24. and (3) paint throwing: centrifuging and throwing paint for 2min according to a rotation rate of 60-100 r/min;
B25. and (5) drying.
5. The method for manufacturing an acid salt spray corrosion resistant aluminum alloy plate-fin heat exchanger according to claim 3 or 4, wherein the step of dipping paint is repeated 2 to 3 times, and dipping paint is performed next time after each dipping paint by reversing the dipping direction upside down.
6. The method for manufacturing an acid salt spray corrosion resistant aluminum alloy plate-fin heat exchanger according to claim 3, wherein the step of primer dipping treatment is repeated 2 to 4 times.
7. The method for manufacturing an acid salt spray corrosion resistant aluminum alloy plate-fin heat exchanger according to claim 3, wherein the viscosity of the H06-1012H epoxy primer coating-4 is 15-17 s.
8. The method for manufacturing an acid salt spray corrosion resistant aluminum alloy plate-fin heat exchanger according to claim 4, wherein the viscosity of the 881-H02 epoxy varnish coated-4 is 22-25 s.
9. The method for manufacturing an acid salt spray corrosion resistant aluminum alloy plate-fin heat exchanger according to claim 1, wherein the heat exchanger is subjected to precision corrosion before chromate passivation treatment, and the process is as follows:
immersing the heat exchanger in the precision corrosion solution for not more than 30s; the precise corrosion solution comprises 20-35 g/L sulfuric acid H 2 SO 4 135-160 g/L CrO 3 Cr of not more than 30g/L 2 O 3 。
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