CN107937903A - A kind of preparation method of corrosive protection of aluminium alloy layer - Google Patents
A kind of preparation method of corrosive protection of aluminium alloy layer Download PDFInfo
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- CN107937903A CN107937903A CN201711285920.2A CN201711285920A CN107937903A CN 107937903 A CN107937903 A CN 107937903A CN 201711285920 A CN201711285920 A CN 201711285920A CN 107937903 A CN107937903 A CN 107937903A
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- 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
- C23C22/78—Pretreatment of the material to be coated
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- 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
- B05D3/10—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 by other chemical means
- B05D3/102—Pretreatment of metallic substrates
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- 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
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- 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
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- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/24—Cleaning or pickling metallic material with solutions or molten salts with neutral solutions
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- 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
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- 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
- B05D2451/00—Type of carrier, type of coating (Multilayers)
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- 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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- 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
- B05D2506/00—Halogenated polymers
- B05D2506/10—Fluorinated polymers
-
- 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
- B05D2601/00—Inorganic fillers
- B05D2601/20—Inorganic fillers used for non-pigmentation effect
- B05D2601/28—Metals
Abstract
The invention discloses a kind of preparation method of corrosive protection of aluminium alloy layer, including：S01, pretreatment：Aluminium alloy is placed in degreaser and carries out ungrease treatment；S02, activates delustring：Pretreated aluminium alloy is dipped in activation deglossing liquid and is handled；S03, chemical oxidation：Aluminium alloy after activation delustring is dipped in chemical oxidation liquid and is handled；S04, basecoat paint：Spraying epoxy zinc-enriched paint is carried out using high-pressure electrostatic gas spray gun；S05, anticorrosive paint spraying：Spraying fluorine carbon anticorrosive paint is carried out using high-pressure electrostatic gas spray gun.Preparation method in the present invention forms firm and good heat-conductive characteristic erosion resistant coating in aluminum alloy material surface using the cleaning to aluminum alloy material surface progress completeness, activation, chemical conversion, the technique sprayed twice.
Description
Technical field
The invention belongs to aluminium alloy manufacture field, and in particular to a kind of preparation method of corrosive protection of aluminium alloy layer.
Background technology
Aluminium and aluminium alloy are strong, in beautiful color, nonmagnetic, corrosion-resistant with specific strength height, heat conduction and good conductivity, reflective
Property good and plasticity and good moldability, without black brittleness the advantages that, be a kind of nonferrous materials with excellent comprehensive performance.
Aluminium and aluminium alloy are widely used in each department of national economy, become in terms of yield and purposes and are only second to the of steel
Two big metal materials.Aluminium and aluminum alloy surface oxide-film are aluminium alloy tolerance atmospheric corrosion and the main original of liquid environment corrosion
Cause, once it is present in the corrosive medium containing the aggressivity anionic atmosphere such as relatively large chlorion and oxygen, aggressivity anion
Aluminium and aluminium alloy matrix surface can be reached by oxide-film so as to cause the pitting corrosion or other kinds of of aluminium alloy
Corrosion.With the development that aluminum alloy materials are applied, its process for treating surface also develops rapidly.Surface treatment can improve aluminium
And the lifting capacity and wear resistance and corrosion resistance of aluminium alloy, generally comprise alumilite process, chemical conversion, organic coating coating, plating,
The treatment process such as electrophoresis.In above-mentioned surface treatment method, such as anodizing, by the use of in electrolyte using Al-alloy products as
Anode, aluminium sheet generate oxide-film, the oxide thickness is high, it is very good to have after energization as cathode in aluminum alloy product surface
Corrosion resistance, and insulate it is non-conductive, durability is good.And for example chemical oxidization method, on the surface of Al-alloy products using Trend of Chrome-free
Chemical conversion processing method, using manganate, molybdate, rare earth metal salt etc. aluminium and aluminum alloy surface formed continuous-stable,
It is firmly combined with and has the oxidation film layer of protective value.Also some new methods, such as laser cladding, sol-gal process,
Ion ablation etc..
Aluminum alloy materials frequently as heat conducting parts due to the anti-corrosion property of lightweight, being used, as seawater is light
Used heat-transfer pipe during change, it is light to can obviously reduce seawater by the use of aluminium alloy substitution copper alloy as vapo(u)rization system heat-transfer pipe
Change equipment manufacturing cost and water producing cost.During copper alloy is substituted, how aluminum alloy heat transfer tube is situated between for a long time with heat transfer
Matter --- water avoids the problem that corrosion is one of most important problem during being in contact.In sea water desalination vaporising device, work
Condition is complicated, and aluminum alloy materials will withstand the corrosion condition under a variety of different conditions, while also ensure performance, at present state
The inside and outside method generally used makes to coat organic polymer protective coating on aluminum alloy heat transfer tube surface, obtains its surface certain
Protection, but protective coating generally requires the effect that certain thickness can be only achieved protection in use, once and table
The paint thickness of face coating is excessive, can substantially reduce the heat transfer property of aluminium-alloy pipe.In face of the above problem, aluminium conjunction how is balanced
Golden etch resistant properties and aluminum alloy heat conductive performance is the most important thing in research.
The content of the invention
In order to solve the deficiencies in the prior art, the present invention provides one kind to have strong anti-corrosion capability and heat-conductive characteristic concurrently
Aluminum alloy materials erosion resistant coating preparation method, the present invention in preparation method utilize to aluminum alloy material surface progress completeness
Cleaning, activation, chemical conversion, the technique sprayed twice, aluminum alloy material surface form firmly and heat-conductive characteristic it is good
Erosion resistant coating.
The technique effect of the invention to be reached is realized by following scheme：
The preparation method of the corrosive protection of aluminium alloy layer provided in the present invention, includes the following steps：
S01, pretreatment：Aluminium alloy is placed in degreaser and carries out ungrease treatment, the degreaser constituent content is sodium carbonate 15-
25g/L, sodium phosphate 10-18 g/L, soap 20-25 g/L, surfactant 3-5g/L, surplus are water, skimming temp 35-40
DEG C, aluminium alloy 3-5min is soaked, then using degreaser circulation flushing 3-5 time, shower water cleaning aluminium conjunction is utilized after degreasing
Gold surface is to noresidue；
S02, activates delustring：Pretreated aluminium alloy is dipped in activation deglossing liquid and is handled, the activation deglossing liquid group
Point content is：Ammonium fluoride 4-8 g/L, ammonium sulfate 5-10 g/L, calcium chloride 13-15 g/L, sodium gluconate 0.1-0.5 g/L,
Sulfamic acid 5-6 g/L, surplus are water, and the treatment temperature for activating deglossing liquid is 38-40 DEG C, handling duration 1-3min, processing
After using shower water cleaning aluminum alloy surface to noresidue；
S03, chemical oxidation：Aluminium alloy after activation delustring is dipped in chemical oxidation liquid and is handled, the chemical oxidation liquid
Constituent content for hexafluoro zirconate 3-5 g/L, eight water basic zirconium chloride 2-2.5g/L, arabic acid 10-20 g/L, ammonium acid fluoride 3-
It is water that 3.5 g/L, boric acid 0.6-1.2 g/L, tetrahydroxy, which close potassium aluminate 5-5.4 g/L, EDTA0.5-0.8 g/L, surplus, chemistry
The temperature of oxidation is 40-42 DEG C, a length of 4-8min during oxidation, using shower water cleaning aluminum alloy surface to without residual after being disposed
Stay；
S04, basecoat paint：Spraying epoxy zinc-enriched paint, spray gun pressure 0.95- are carried out using high-pressure electrostatic gas spray gun
1.0MPa, painting thickness are 5-6 μm；
S05, anticorrosive paint spraying：Spraying fluorine carbon anticorrosive paint, spray gun pressure 0.80- are carried out using high-pressure electrostatic gas spray gun
0.82MPa, painting thickness are 5-8 μm.
In the present invention, aluminum alloy material surface is subjected to purification ungrease treatment first.The purpose of ungrease treatment is thoroughly to go
Except the greasy dirt of aluminum alloy material surface and dirty, ensure the uniformity of aluminum alloy material surface, lifted and produced in subsequent processing steps
The quality of the product gone out.It is different from organic degreasing commonly used in the prior art, acidity, alkaline degreasing, it is of the invention in using
The method of surfactant degreasing.Organic degreasing method can produce substantial amounts of debirs, not only increase the difficulty of processing, and
To use lye to carry out secondary cleaning after ungrease treatment, not only increase processing step, and adding technique waste water processing
Difficulty.Using acid or alkaline degreasing it will cause the hidden danger that aluminum alloy surface is likely to form anticaustic, follow-up
Expand Corrosion Potential point in chemical oxidation step, point corrosion pit is easily formed in coating bottom during aluminium alloy long-time service, so that
Unpredictable corrosion failure is caused, influences to use safely.Carbonate, phosphate and soap and surface-active are used in the present invention
Agent is used cooperatively, and cleaning performance is good and to aluminum alloy surface noresidue, will not leave current mark as organic washing agent.
For second step using activation delustring step, the purpose is to smooth easy to follow-up chemical oxidation of gold in the present invention
Carry out.If being not provided with activation delustring step, aluminum alloy surface is reacted slowly, and since surface is excessively smooth in chemical oxidation of gold
It is difficult to be formed smoothly chemical oxidation reaction process.Chemical oxidation is at a certain temperature, to make clean aluminum alloy materials table
The method that face reacts with the oxygen in oxidation solution and generates oxide-film.Chemical oxide film has compared with anode oxide film
The advantages that film forming speed is fast, processing equipment is simple, production cost is low, Paint Adhesion can be good.Although chemical oxide film ratio is not
The hardness and coloring of Anodic oxide-film, but chemical oxide film excellent corrosion resistance, the chemical oxidation prepared in of the invention
Membrane aperture is big, porosity is high, has extraordinary absorption to follow-up coating spraying, makes finally formed coating very firm
Gu.The protective layer of erosion resistant coating, in the present invention, control are collectively formed in the present invention using basecoat paint and anticorrosive paint spraying
The thickness of priming paint and corrosion-inhibiting coating fluorine carbon anticorrosive paint processed, the coating layer thickness for making both are only prior art coating thickness
30% or so, the thickness of coating is substantially reduced, in actual use, since fiting chemical oxide layer carries out in the present invention
Use, on the premise of the identical capacity of heat transmission, the aluminium alloy of the spraying fluorocarbon coating of its anti-corrosion capability than in the prior art
Product（General coating thickness is more than 30 μm in the prior art）It is more excellent.
Further, in S01, preferred surfactant for sorbitan fatty acid ester, nonyl phenol polyethylene oxide ether,
One kind in quillajic acid.
Further, in S03, the chemical oxidation film thickness of aluminum alloy surface generation is 1.5-2.0 μm.
Further, in S04, Zn content is 88-92wt% in the epoxy zinc-enriched paint.
Further, in S04,0.2-0.5wt% zirconium powders are included in the epoxy zinc-enriched paint.
Further, the zirconium powder particle is 20-100nm.
The Zn content in epoxy zinc-enriched paint is controlled in the present invention, on the one hand reduces coating film forming thickness, and metal
Component is more, and swelling ratio is low, more durable when the alloy product after spraying is used in water body environment.On the other hand, Zn content
Increase liquid improves the thermal conductivity of coating entirety.To increase thermal conductivity, also add in the present invention in epoxy zinc-enriched paint few
The nanometer zirconium metal-powder of amount, nanometer zirconium powder can not only further lift coating thermal conductivity, and since zirconium nature is steady
Determine, the cathodic protection face that stable and uniform can be formed in aluminum alloy surface is combined with zinc powder, aluminium alloy service life be substantially improved.
Further, in S04,5-6min is toasted in 120-125 DEG C of baking oven after basecoat paint and then carry out anti-corrosion while hot
The spraying of coating.
Further, in S05, the fluorine carbon anticorrosive paint is great Jin Zeffle GK570 fluorine resin coatings.
Further, in S05, toasted 20-25 minutes in 255-260 DEG C of baking oven after anticorrosive paint spraying.
The present invention has the following advantages：
The present invention provides a kind of preparation method for the aluminum alloy materials erosion resistant coating for having strong anti-corrosion capability and heat-conductive characteristic concurrently, sheet
Preparation method in invention is using carrying out aluminum alloy material surface the cleaning of completeness, activation, chemical conversion, spray twice
Technique, firm and good heat-conductive characteristic erosion resistant coating is formd in aluminum alloy material surface.
Embodiment
With reference to embodiment, the present invention will be described in detail.
Internal diameter is 2.5cm, outside diameter is 3.2cm light wall pipe is made as sample in 6061 wrought aluminium alloys in the embodiment of the present invention
Example carries out the processing in following embodiments, and same sample aluminium-alloy pipe 100PCS is handled in each embodiment.
Embodiment 1
S01, pretreatment：Aluminium alloy is placed in degreaser and carries out ungrease treatment, the degreaser constituent content is sodium carbonate
22g/L, 18 g/L of sodium phosphate, 25 g/L of soap, sorbitan fatty acid ester 4g/L, surplus are water, and skimming temp is 40 DEG C,
Aluminium alloy 5min is soaked, then using degreaser circulation flushing 5 times, after degreasing using shower water cleaning aluminum alloy surface extremely
Noresidue.
S02, activates delustring：Pretreated aluminium alloy is dipped in activation deglossing liquid and is handled, the activation delustring
Liquid constituent content is：Ammonium fluoride 8g/L, 10 g/L of ammonium sulfate, calcium chloride 15g/L, 0.5 g/L of sodium gluconate, sulfamic acid 6
G/L, surplus are water, and the treatment temperature for activating deglossing liquid is 40 DEG C, handling duration 2min, clear using shower water after being disposed
Aluminum alloy surface is washed to noresidue.
S03, chemical oxidation：Aluminium alloy after activation delustring is dipped in chemical oxidation liquid and is handled, the chemical oxygen
Change 4 g/L of constituent content hexafluoro zirconate, eight water basic zirconium chloride 2.3g/L, 18 g/L of arabic acid, 3.4 g/ of ammonium acid fluoride of liquid
L, it is water that 1 g/L of boric acid, tetrahydroxy, which close the g/L of potassium aluminate 5.2, EDTA0.7 g/L, surplus, and the temperature of chemical oxidation is 40 DEG C,
A length of 6min during oxidation, utilizes shower water cleaning aluminum alloy surface to noresidue after being disposed.
The chemical oxidation film thickness of aluminum alloy specimen pipe surface generation is in 1.5-2.0 μ ms.
S04, basecoat paint：Spraying epoxy zinc-enriched paint is carried out using high-pressure electrostatic gas spray gun, spray gun pressure 1.0MPa,
Painting thickness is 5 μm.Zn content is 92wt% in epoxy zinc-enriched paint, and 5min is toasted then in 120 DEG C of baking ovens after basecoat paint
The spraying of anticorrosive paint is carried out while hot.
S05, anticorrosive paint spraying：Spraying fluorine carbon anticorrosive paint is carried out using high-pressure electrostatic gas spray gun, spray gun pressure is
0.80MPa, painting thickness are 8 μm.Fluorine carbon anticorrosive paint is great Jin Zeffle GK570 fluorine resin coatings.After anticorrosive paint spraying
Toasted 20- minutes in 258 DEG C of baking ovens, armor coated aluminium-alloy pipe is obtained after natural cooling.
Embodiment 2
The present embodiment all conditions are same as Example 1, in epoxy zinc-enriched paint to the addition of 0.5wt%'s only in S04 more
Average grain diameter is the zirconium powder of 20nm.
Embodiment 3
The present embodiment all conditions are same as Example 1, and only in S01, surfactant is nonyl phenol polyethylene oxide ether.
Embodiment 4
The present embodiment all conditions are same as Example 1, and only in S01, surfactant is quillajic acid.
Comparative example 1
Identical sample aluminium-alloy pipe, using great Jin Zeffle GK570 fluorine resin coatings in 40 μm of surface spraying after caustic dip
Coating.
Comparative example 2
Identical sample aluminium-alloy pipe, the present embodiment all conditions are same as Example 1, and pre-treatment step is changed to the prior art
In alkali cleaning（15wt% sodium hydroxides clean）Degreasing.
Comparative example 3
Identical sample aluminium-alloy pipe, the present embodiment all conditions are same as Example 1, reduce S02 activation delustring steps.
Comparative example 4
Identical sample aluminium-alloy pipe, the present embodiment all conditions are same as Example 1, reduce S02 activation delustrings and S03 chemistry
Oxidation step.
Comparative example 5
The brass tube of size identical with sample aluminium-alloy pipe.
Test：
Carry out salt spray resistance test and heat conductivility test respectively to above-described embodiment and comparative example.
Salt spray resistance is tested using ISO7253《The measure of the resistance to neutral salt spray performance of paint and varnish》Method, is added
Fast corrosion test.Heat conductivility test is then the measure for carrying out heat transfer coefficient.Specific test result is as follows：
As can be seen from the above-described embodiment, the corrosive protection of aluminium alloy layer corrosion resistance being prepared in the present invention is good, and heat transfer property is good, to the greatest extent
Pipe can not exceed brass tube in terms of heat transfer, but heat-transfer effect has reached workable degree, from cost, the present invention
In aluminium-alloy pipe unit price be only brass tube 30% or so, it is cost-effective.Preparation method in the present invention is utilized to aluminium alloy material
The cleaning of material surface progress completeness, activation, chemical conversion, the technique sprayed twice, jail is formd in aluminum alloy material surface
Gu the and erosion resistant coating that heat-conductive characteristic is good.
It is last it should be noted that above example only to illustrate the technical solution of the embodiment of the present invention rather than to its into
Row limitation, although the embodiment of the present invention is described in detail with reference to preferred embodiment, those of ordinary skill in the art
It should be understood that still can be to the technical solution technical scheme is modified or replaced equivalently of the embodiment of the present invention, and these are changed or wait
The scope of amended technical solution disengaging technical solution of the embodiment of the present invention cannot also be made with replacement.
Claims (9)
1. a kind of preparation method of corrosive protection of aluminium alloy layer, it is characterised in that include the following steps：
S01, pretreatment：Aluminium alloy is placed in degreaser and carries out ungrease treatment, the degreaser constituent content is sodium carbonate 15-
25g/L, sodium phosphate 10-18 g/L, soap 20-25 g/L, surfactant 3-5g/L, surplus are water, skimming temp 35-40
DEG C, aluminium alloy 3-5min is soaked, then using degreaser circulation flushing 3-5 time, shower water cleaning aluminium conjunction is utilized after degreasing
Gold surface is to noresidue；
S02, activates delustring：Pretreated aluminium alloy is dipped in activation deglossing liquid and is handled, the activation deglossing liquid group
Point content is：Ammonium fluoride 4-8 g/L, ammonium sulfate 5-10 g/L, calcium chloride 13-15 g/L, sodium gluconate 0.1-0.5 g/L,
Sulfamic acid 5-6 g/L, surplus are water, and the treatment temperature for activating deglossing liquid is 38-40 DEG C, handling duration 1-3min, processing
After using shower water cleaning aluminum alloy surface to noresidue；
S03, chemical oxidation：Aluminium alloy after activation delustring is dipped in chemical oxidation liquid and is handled, the chemical oxidation liquid
Constituent content for hexafluoro zirconate 3-5 g/L, eight water basic zirconium chloride 2-2.5g/L, arabic acid 10-20 g/L, ammonium acid fluoride 3-
It is water that 3.5 g/L, boric acid 0.6-1.2 g/L, tetrahydroxy, which close potassium aluminate 5-5.4 g/L, EDTA0.5-0.8 g/L, surplus, chemistry
The temperature of oxidation is 40-42 DEG C, a length of 4-8min during oxidation, using shower water cleaning aluminum alloy surface to without residual after being disposed
Stay；
S04, basecoat paint：Spraying epoxy zinc-enriched paint, spray gun pressure 0.95- are carried out using high-pressure electrostatic gas spray gun
1.0MPa, painting thickness are 5-6 μm；
S05, anticorrosive paint spraying：Spraying fluorine carbon anticorrosive paint, spray gun pressure 0.80- are carried out using high-pressure electrostatic gas spray gun
0.82MPa, painting thickness are 5-8 μm.
2. the preparation method of corrosive protection of aluminium alloy layer as claimed in claim 1, it is characterised in that：In S01, the surfactant is
One kind in sorbitan fatty acid ester, nonyl phenol polyethylene oxide ether, quillajic acid.
3. the preparation method of corrosive protection of aluminium alloy layer as claimed in claim 1, it is characterised in that：In S03, aluminum alloy surface generation
Chemical oxidation film thickness is 1.5-2.0 μm.
4. the preparation method of corrosive protection of aluminium alloy layer as claimed in claim 1, it is characterised in that：In S04, the epoxy zinc-enriched paint
Middle Zn content is 88-92wt%.
5. the preparation method of corrosive protection of aluminium alloy layer as claimed in claim 1, it is characterised in that：In S04, the epoxy zinc-enriched paint
In include 0.2-0.5wt% zirconium powders.
6. the preparation method of corrosive protection of aluminium alloy layer as claimed in claim 5, it is characterised in that：The zirconium powder particle is 20-
100nm。
7. the preparation method of corrosive protection of aluminium alloy layer as claimed in claim 1, it is characterised in that：In S04, in 120- after basecoat paint
5-6min is toasted in 125 DEG C of baking ovens and then carries out the spraying of anticorrosive paint while hot.
8. the preparation method of corrosive protection of aluminium alloy layer as claimed in claim 1, it is characterised in that：In S05, the fluorine carbon anticorrosive paint
For great Jin Zeffle GK570 fluorine resin coatings.
9. the preparation method of corrosive protection of aluminium alloy layer as claimed in claim 1, it is characterised in that：In S05, anticorrosive paint spraying after
Toasted 20-25 minutes in 255-260 DEG C of baking oven.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201711285920.2A CN107937903A (en) | 2017-12-07 | 2017-12-07 | A kind of preparation method of corrosive protection of aluminium alloy layer |
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| CN201711285920.2A CN107937903A (en) | 2017-12-07 | 2017-12-07 | A kind of preparation method of corrosive protection of aluminium alloy layer |
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| CN107937903A true CN107937903A (en) | 2018-04-20 |
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| CN (1) | CN107937903A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108380471A (en) * | 2018-05-04 | 2018-08-10 | 自贡东方彩钢结构有限公司 | A kind of proximate matter fluororine-carbon coating technique |
| CN109396002A (en) * | 2018-10-29 | 2019-03-01 | 江苏先锋钢结构工程有限公司 | Steel structure anti-corrosion paint construction technology |
| CN111659589A (en) * | 2019-03-06 | 2020-09-15 | 天津职业技术师范大学(中国职业培训指导教师进修中心) | Preparation method of metal surface micro-texture and strong-adhesion polymer lubricating layer |
| CN112221913A (en) * | 2020-10-20 | 2021-01-15 | 东莞市华昌铝业有限公司 | High-corrosion-resistance aluminum profile and processing technology thereof |
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| CN103938198A (en) * | 2014-04-24 | 2014-07-23 | 湖南金裕化工有限公司 | Phosphorus-free nano vitrification agent, and preparation method and application thereof |
| CN104328417A (en) * | 2013-07-22 | 2015-02-04 | 无锡永发电镀有限公司 | Aluminium alloy radiator passivation technology before spraying paint |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104328417A (en) * | 2013-07-22 | 2015-02-04 | 无锡永发电镀有限公司 | Aluminium alloy radiator passivation technology before spraying paint |
| CN103938198A (en) * | 2014-04-24 | 2014-07-23 | 湖南金裕化工有限公司 | Phosphorus-free nano vitrification agent, and preparation method and application thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108380471A (en) * | 2018-05-04 | 2018-08-10 | 自贡东方彩钢结构有限公司 | A kind of proximate matter fluororine-carbon coating technique |
| CN109396002A (en) * | 2018-10-29 | 2019-03-01 | 江苏先锋钢结构工程有限公司 | Steel structure anti-corrosion paint construction technology |
| CN111659589A (en) * | 2019-03-06 | 2020-09-15 | 天津职业技术师范大学(中国职业培训指导教师进修中心) | Preparation method of metal surface micro-texture and strong-adhesion polymer lubricating layer |
| CN112221913A (en) * | 2020-10-20 | 2021-01-15 | 东莞市华昌铝业有限公司 | High-corrosion-resistance aluminum profile and processing technology thereof |
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