CN107974702A - A kind of preparation method of durability aluminium alloy protective layer - Google Patents
A kind of preparation method of durability aluminium alloy protective layer Download PDFInfo
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- CN107974702A CN107974702A CN201711287405.8A CN201711287405A CN107974702A CN 107974702 A CN107974702 A CN 107974702A CN 201711287405 A CN201711287405 A CN 201711287405A CN 107974702 A CN107974702 A CN 107974702A
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/16—Pretreatment, e.g. desmutting
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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
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
-
- 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
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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
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
- C25D11/08—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing inorganic acids
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
- C25D11/10—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing organic acids
-
- 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
- B05D2504/00—Epoxy 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
- B05D2506/00—Halogenated polymers
- B05D2506/10—Fluorinated polymers
Abstract
The invention discloses the preparation method that a kind of durability aluminium closes protective 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, anodic oxidation：Aluminium alloy after cleaning is put immediately into anodizing solution and carries out anodic oxidation；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 the good protective layer of firm and good heat-conductive characteristic durability using the cleaning to aluminum alloy material surface progress completeness, activation, anodic oxidation, the technique sprayed twice in aluminum alloy material surface.
Description
Technical field
The invention belongs to technical field of aluminum alloy technology, and in particular to a kind of preparation side of aluminium alloy durability aluminium alloy protective layer
Method.
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 anodizing, 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, durability is prepared than existing in aluminum alloy surface the present invention provides one kind
There is protective layer more preferably method in technology, this method is combined with spraying process using the anodizing of aluminium alloy, enabled aluminum alloy to
Surface has the multiple-protection layer of strong anti-corrosion capability and heat-conductive characteristic concurrently.Preparation method in the present invention is utilized to aluminum alloy materials
The cleaning of surface progress completeness, activation, anodic oxidation, the technique sprayed twice, form firmly in aluminum alloy material surface
And the good protective layer of durability that heat-conductive characteristic is good.
The technique effect of the invention to be reached is realized by following scheme：
The preparation method of the aluminum alloy surface protective 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, alum 15-18 g/L, sodium gluconate 0.1-0.5 g/L, Ah
It is water to draw uncle's natural gum 3-4 g/L, surplus, and the treatment temperature for activating deglossing liquid is 40-42 DEG C, handling duration 1-3min, processing
After using shower water cleaning aluminum alloy surface to noresidue；
S03, anodic oxidation：Aluminium alloy after cleaning is put immediately into anodizing solution and carries out anodic oxidation, the sun
The formula and process conditions of pole oxidation solution be：Solvent is water, sulfuric acid 195-200g/L, oxalic acid 6-8 g/L, maleic acid 2-3 g/L,
Ethylene glycol 2-3mL/L, resveratrol 0.6-0.8mL/L, ammonium tartrate 0.6-0.8g, triethanolamine 2-3mL/L, current density are
1.0-1.05A/dm3, temperature is 30-35 DEG C, and the time of anodic oxidation is 12-15min；
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 anodization 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 anode oxidation process 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 anode oxidation process
It is difficult to be formed smoothly anodic oxidation reactions process.The process of anodic oxidation generates oxide-film using electric energy in aluminum alloy surface
Layer.Anodizing of aluminium is substantially exactly the electrolysis of water, and electrolyte is hydrolyzed under the action of electric current after being powered, released on cathode
Hydrogen is released, then Ghandler motion moves electrically charged anion on the sunny side, discharges electronics in anode, a part of nascent atomic oxygen is with being used as anode
Aluminium alloy react generation aluminum oxide film layer.Using sulphuric acid anodizing liquid in the present invention, used in the oxidation solution
Oxalic acid and maleic acid add ethylene glycol and resveratrol and accelerate reaction speed as auxiliary additive as mixing acid system
Rate, lifts anodic oxidation membrane porosity.Meanwhile on the one hand the addition of ammonium tartrate and triethanolamine helps to make anodic oxidation
Cheng Gengjia is steady, on the other hand enables aluminum alloy to surface anodization membrane porosity higher, is more conducive to follow-up spraying coating process.
The anodic oxidation membrane aperture prepared in the present invention is big, porosity is high, and it is very good to have to follow-up coating spraying
Absorption, make finally formed coating very firm.Sprayed altogether using basecoat paint and anticorrosive paint in the present invention
With the protective layer for forming erosion resistant coating, in the present invention, the thickness of priming paint and corrosion-inhibiting coating fluorine carbon anticorrosive paint is controlled, makes both
Coating layer thickness is only 30% or so of prior art coating thickness, substantially reduces the thickness of coating, in actual use process
In, due to coordinating anodic oxide coating to be used in the present invention, on the premise of the identical capacity of heat transmission, its anti-corrosion capability ratio
The alloy product of spraying fluorocarbon coating of the prior art（General coating thickness is more than 30 μm in the prior art）It is more excellent.
Further, in S01, preferred surfactant is dioctyl succinate disulfonate acid, sodium glycocholate, cocoyl glucose
One kind in glycosides, lauryl glucoside, synthetic detergent.
Further, in S03, the thickness of the anode oxidation membrane is 32-35 μm, and film layer porosity is 22-24%.
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 one kind durability protective layer more preferably method than in the prior art, this method are prepared in aluminum alloy surface
It is combined using the anodizing of aluminium alloy with spraying process, enables aluminum alloy to surface and have strong anti-corrosion capability and heat-conductive characteristic concurrently
Multiple-protection layer.Preparation method in the present invention utilizes the cleaning, activation, anodic oxygen that completeness is carried out to aluminum alloy material surface
The technique change, sprayed twice, the good protective layer of firm and good heat-conductive characteristic durability 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
25g/L, 18 g/L of sodium phosphate, 25 g/L of soap, dioctyl succinate disulfonate acid 4g/L, surplus are water, and skimming temp is 40 DEG C,
Aluminium alloy 3min 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 6g/L, 10 g/L of ammonium sulfate, 15 g/L of alum, 0.3 g/L of sodium gluconate, gum arabic
3.3 g/L, surplus are water, and the treatment temperature for activating deglossing liquid is 42 DEG C, handling duration 2min, and spray is utilized after being disposed
Water cleaning aluminum alloy surface is to noresidue.
S03, anodic oxidation：Aluminium alloy after cleaning is put immediately into anodizing solution and carries out anodic oxidation, institute
The formula and process conditions for stating anodizing solution be：Solvent is water, sulfuric acid 200g/L, 8 g/L of oxalic acid, 2.5 g/L of maleic acid, second
Glycol 3mL/L, resveratrol 0.66mL/L, ammonium tartrate 0.6g, triethanolamine 2.5mL/L, current density 1A/dm3, temperature
For 35 DEG C, the time of anodic oxidation is 15min.
The average thickness of anode oxidation membrane is 35 μm, and film layer porosity is 24%.
S04, basecoat paint：Spraying epoxy zinc-enriched paint is carried out using high-pressure electrostatic gas spray gun, spray gun pressure is
0.95MPa, painting thickness are 5 μm.Zn content is 92wt% in epoxy zinc-enriched paint, is toasted after basecoat paint in 120 DEG C of baking ovens
5min and then the spraying for carrying out anticorrosive paint 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
0.82MPa, painting thickness are 6 μm.Fluorine carbon anticorrosive paint is great Jin Zeffle GK570 fluorine resin coatings.After anticorrosive paint spraying
Toasted 20- minutes in 260 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 0.3wt%'s only in S04 more
Average grain diameter is the zirconium powder of 50nm.
Embodiment 3
The present embodiment all conditions are same as Example 1, and only in S01, surfactant is washed for the neutral synthesis of commercially available industry
Wash agent.
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 anodes
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 aluminium alloy protective 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, anodic oxidation, the technique sprayed twice, jail is formd in aluminum alloy material surface
Gu the and good protective layer of durability 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 durability aluminium alloy protective 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, alum 15-18 g/L, sodium gluconate 0.1-0.5 g/L, Ah
It is water to draw uncle's natural gum 3-4 g/L, surplus, and the treatment temperature for activating deglossing liquid is 40-42 DEG C, handling duration 1-3min, processing
After using shower water cleaning aluminum alloy surface to noresidue；
S03, anodic oxidation：Aluminium alloy after cleaning is put immediately into anodizing solution and carries out anodic oxidation, the sun
The formula and process conditions of pole oxidation solution be：Solvent is water, sulfuric acid 195-200g/L, oxalic acid 6-8 g/L, maleic acid 2-3 g/L,
Ethylene glycol 2-3mL/L, resveratrol 0.6-0.8mL/L, ammonium tartrate 0.6-0.8g/L, triethanolamine 2-3mL/L, current density
For 1.0-1.05A/dm3, temperature is 30-35 DEG C, and the time of anodic oxidation is 12-15min；
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 aluminium alloy protective layer as claimed in claim 1, it is characterised in that：In S01, the surfactant is
One kind in dioctyl succinate disulfonate acid, sodium glycocholate, cocoyl glucoside, lauryl glucoside, synthetic detergent.
3. the preparation method of aluminium alloy protective layer as claimed in claim 1, it is characterised in that：In S03, the anode oxidation membrane
Thickness be 32-35 μm, film layer porosity is 22-24%.
4. the preparation method of aluminium alloy protective 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 aluminium alloy protective 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 aluminium alloy protective layer as claimed in claim 5, it is characterised in that：The zirconium powder particle is 20-
100nm。
7. the preparation method of aluminium alloy protective 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 aluminium alloy protective 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 aluminium alloy protective 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.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111074320A (en) * | 2019-12-24 | 2020-04-28 | 托伦斯半导体设备启东有限公司 | Electrolyte for preparing aluminum alloy hard anodic oxide film and preparation method |
| CN113829677A (en) * | 2021-09-14 | 2021-12-24 | 滁州市永通交通设备有限公司 | Aluminum honeycomb wallboard for high-speed rail and production process |
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| CN106400082A (en) * | 2016-12-14 | 2017-02-15 | 玉林师范学院 | Preparation technology of aluminum alloy with surface provided with high-hardness anode oxide film |
| CN106655014A (en) * | 2017-01-09 | 2017-05-10 | 镇江华中电器有限公司 | Heavy duty anticorrosion surface treatment method for aluminum alloy cable laying device dedicated for the ocean |
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