CN104962974B - A kind of alkaline-resisting Alcoa surface composite coating and technique - Google Patents
A kind of alkaline-resisting Alcoa surface composite coating and technique Download PDFInfo
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- CN104962974B CN104962974B CN201510320169.XA CN201510320169A CN104962974B CN 104962974 B CN104962974 B CN 104962974B CN 201510320169 A CN201510320169 A CN 201510320169A CN 104962974 B CN104962974 B CN 104962974B
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Abstract
The invention belongs to field of metal surface treatment technology,Provide a kind of alkaline-resisting Alcoa surface composite coating and technique,Including aluminum or aluminum alloy matrix and the anode oxidation membrane being attached to outside aluminum or aluminum alloy matrix,It is attached with organosilane coating outside anode oxidation membrane,Organosilane coating is the composite layer that epoxy modified silicone resin and methyl methacrylate form,By allotment,Spraying method is constructed,By the infiltration to aoxidizing fenestra,Diffusion,Closing,By the solidification of 180 DEG C of * 20 25min after surface layer is dodged and is done,It is firmly attached to the surface after anodic oxidation,The infiltration of corrosivity or alkaline matter for internal layer oxidation film and aluminum substrate is obstructed,Alloy product by this process has very strong alkali resistance and corrosion resistance,Heat-resisting quantity can be improved to 180 DEG C and not cracked,Under the conditions of not changing original appearance requirement,Meet the performance standard requirement of depot.
Description
Technical field
The invention belongs to field of metal surface treatment technology, it is related to a kind of alkaline-resisting Alcoa surface composite coating and work
Skill.
Background technology
Currently, many automobiles interior exterior domain be equipped with by aluminium sheet or aluminium section bar manufacture exhibit metallic true qualities decoration
Property component, surfacecti proteon mainly by anodic oxidation aluminum or aluminum alloy surface formed one layer of porous aluminum oxide film layer simultaneously
The hole of film layer closed by certain chemical method to realize.But in order to maintain decorative durable, mesh
There are increasingly higher demands, especially strong basicity type vehicle cleaning detergent in Qian Ge depots for the corrosion resistance of aluminium alloy part surface protecting layer
Be widely used, because this traditional anodized coating is difficult to resist strong basicity (pH value>13) erosion of solution, and make component
Loss of gloss is eclipsed, therefore, in order to meet the alkaline-resisting corrosion-resistant requirement of higher and higher anodized coating, improves anodic oxidation product
Performance and associated vehicle parts product competitiveness in the market research and develop this technique.
Invention content
The technical problem to be solved by the present invention is to the present situations for the prior art, and provide a kind of strong basicity resisting and Gao Nai
Corrosive aluminium alloy surface composite membrane.
Technical solution is used by the present invention solves above-mentioned technical problem：A kind of alkaline-resisting Alcoa surface recombination painting
Layer, including aluminum or aluminum alloy matrix and the anode oxidation membrane that is attached to outside aluminum or aluminum alloy matrix, which is characterized in that the sun
Organosilane coating is attached with outside the oxidation film layer of pole, organosilane coating is epoxy modified silicone resin and methyl methacrylate
The composite layer of ester composition.
The measure taken for optimization said program specifically includes：
In a kind of above-mentioned alkaline-resisting Alcoa surface composite coating, the thickness of the additional organosilane coating
It is 1 μm~5 μm.
In a kind of above-mentioned alkaline-resisting Alcoa surface composite coating, preferably, the organosilane coating
Thickness be 3 μm~5 μm.
In a kind of above-mentioned alkaline-resisting Alcoa surface composite coating, the anode oxidation membrane is this chromatograph,
Or the additive color layer on anode oxidation membrane.
In a kind of above-mentioned alkaline-resisting Alcoa surface composite coating, there is above-mentioned alkaline-resisting Alcoa surface
Composite coating uses on automobile exterior trimming parts.
The present invention also provides a kind of composite film works of the strong aluminum or aluminum alloy component of alkali resistance and corrosion resistance ability
Skill.
Technical solution is used by the present invention solves above-mentioned technical problem：A kind of alkaline-resisting Alcoa surface recombination painting
Layer process carries out conventional anodized in aluminum alloy surface, which is characterized in that the aluminum or aluminum alloy after anodic oxidation
Semi-finished product use silane system coating and by spraying, dodge dry, high-temperature baking and etc. after processing to form one or more layers
Firm additional organosilane coating, and promote the molecule structure change of anode oxidation membrane internal layer in the process, and by
This obtains the double layer of anode oxidation membrane and organosilane coating combination as the final protective layer of aluminum or aluminum alloy matrix.
In a kind of above-mentioned alkaline-resisting Alcoa surface composite coating technique, the silane system coating includes ring
Oxygen modified organic silicone resin component and methyl methacrylate component, epoxy modified silicone resin and methyl methacrylate are pressed
68：32 ratio mixing, solid content effective mass fraction of solids of the epoxy modified silicone resin before mixing, dilution are
45%-65% is diluted to working viscosity using diluent 480-XJS-1152, and silane system coating adjusts viscosity IWATA NK-2
Cup is measured as 7-9 seconds under the conditions of 23 ± 2 DEG C of temperature, and coating is allocated as water white transparency state.
In a kind of above-mentioned alkaline-resisting Alcoa surface composite coating technique, by the half of above-mentioned aluminium alloy anode oxide
Finished product carries out pure water and washes, it is desirable that is pH：3.0~7.0, when embathing：4min~5min embathes temperature：60 DEG C~80 DEG C, hot pure water
Conductivity be less than 20 μ s/m.
In a kind of above-mentioned alkaline-resisting Alcoa surface composite coating technique, then the product of drip-dry is dried
Roasting, baking temperature is 65 DEG C~75 DEG C, and the time is 6min~10min, and (10000 grades of cleanliness factor or more) sprays in pure room environmental
Deployed silane system coating is applied, at 16-20 DEG C, relative humidity is controlled in 45%-70%, using sky the control of painting environments temperature
Gas blowout applies, the small-bore spray guns of 0.5mm-0.8mm, air pressure 4-6kg/cm2；Discharge-amount is in 80-100ml/min, and rifle is away from 20-
30cm, spray gun movement speed are covered in 30-60cm/s, 20-40%.
In a kind of above-mentioned alkaline-resisting Alcoa surface composite coating technique, then required surface spraying is completed
Workpiece is positioned in clean room environment and carries out levelling, dodges and do, and environment temperature is 45-55 DEG C, and relative humidity is controlled in 35%-
55%, flash-off time 6-8min；Dry product will finally be dodged to toast, baking temperature is 160 DEG C~180 DEG C, and the time is
20min~25min.
Compared with the prior art, the advantages of the present invention are as follows the coating by using silane coating series by allotment,
Spraying method is constructed, by infiltration, diffusion, the closing to aoxidizing fenestra, surface layer dodge it is dry after by 180 DEG C of * 20-25min's
Solidification, is firmly attached to the surface after anodic oxidation, has obstructed corrosivity or alkaline matter for internal layer oxidation film and aluminum substrate
Infiltration.And this process also promotes the part three that the sealing of hole substance in oxidation film contains and is hydrated alundum (Al2O3) (Bayer body)
More dehydrations are converted into a hydration alundum (Al2O3) (vigorous nurse body), and the latter has the structure more closely knit than the former and better
Corrosion resistance.Therefore the alloy product Jing Guo this process has very strong alkali resistance and corrosion resistance, high temperature resistant
Property, which can be improved to 180 DEG C, not to crack, and under the conditions of not changing original appearance requirement, the performance standard for meeting depot is wanted
It asks.
Description of the drawings
Fig. 1 is the overall structure diagram of this alkaline-resisting Alcoa surface composite coating.
Specific implementation mode
Following is a specific embodiment of the present invention in conjunction with the accompanying drawings, technical scheme of the present invention will be further described,
However, the present invention is not limited to these examples.
In figure, matrix 1；Anode oxidation membrane 2；Organosilane coating 3.
As shown in Figure 1, this alkaline-resisting Alcoa surface composite coating uses on automobile exterior trimming parts, including aluminium or aluminium close
Auri body 1 and the anode oxidation membrane 2 being attached to outside aluminum or aluminum alloy matrix 1, anode oxidation membrane 2 are attached with organosilan painting outside
Layer 3, the thickness for adding organosilane coating 3 is 1 μm~5 μm, preferably, the thickness of organosilane coating 3 is 3 μm~5 μm,
Anode oxidation membrane 2 is this chromatograph, or the additive color layer on anode oxidation membrane 2.
The present invention is to be initially formed one layer of porous anode oxide film on aluminium alloy part surface, according to different decorative
Surface needs, can select in porous anodic oxide film hole whether deposited metal salt, to make component obtain coloured decoration
Property appearance；Then the transparent of densification is covered after infiltrating good, solidification when spraying one layer of liquid on porous anode oxide film again
Inorganic film is to be combined into the composite film of performance brilliance, the function admirable of anodic oxidation parts surface film layer, high-decoration
Derived from the ingredient and structure of film layer, since silane coating used has intermolecular structure similar with oxidation film layer and microcosmic effect
Power so film layer obtained has splendid stability, double painting interlayers mutual tonifying for the deficiency when by corroding, therefore can carry comprehensively
Single 2 performance of anode oxidation membrane is risen, and film layer is only 3 μm or so because of the silane coating for clear, colorless and after curing, no
Light is caused to reflect, thus do not change aluminium alloy and subsequent polishing, anodic oxidation, coloring are formed by appearance surfaces.
Since anodized coating of the present invention and the technique that is widely used at present are substantially almost the same, this
In illustrated just for composite coating formation mechenism thereafter, alkaline-resisting Alcoa surface composite coating technique, aluminium close
Gold surface carries out conventional anodized, and the semi-finished product of the aluminum or aluminum alloy after anodic oxidation use silane system coating simultaneously
By spraying, dodge dry, high-temperature baking and etc. after processing to form one or more layers firm additional organosilane coating
3, and promote the molecule structure change of 2 internal layer of anode oxidation membrane in the process, and thus obtain anode oxidation membrane 2 and have
The double layer that machine silane coating 3 combines is as 1 final protective layer of aluminum or aluminum alloy matrix.
Concrete technology process flow is as follows：
One, the allotment of silane system coating, silane system coating includes epoxy modified silicone resin component and metering system
Sour methyl esters component, epoxy modified silicone resin and methyl methacrylate press 68：32 ratio mixing, this is epoxy-modified organic
Solid content effective mass fraction of solids of the silicones before mixing, dilution is 45%-65%, using diluent 480-XJS-
1152 are diluted to specified working viscosity, preferably, coating adjusts viscosity IWATA under the construction temperature that the present invention recommends
NK-2 glasss are measured as 7-9 seconds under the conditions of 23 ± 2 DEG C, can have other selections after verification in the trade mark of this diluent.It is dilute
Coating after the releasing stand for standby use after the strong stirring of 5-8min, should be water white transparency state after the allotment of this coating.
Two, the semi-finished product progress hot pure water of above-mentioned aluminium alloy anode oxide is washed, it is desirable that is pH：5.0~7.0, when embathing：
The conductivity of 4min~5min, pure water are less than 20 μ s/m, embathe temperature：60 DEG C~80 DEG C.The main purpose of this process is to sun
Aluminium alloy part after the oxidation of pole is thoroughly cleaned, and will be aoxidized the most of sulfuric acid solution carried in fenestra and is diluted
It removes, while playing the role of certain pre- sealing of hole to porous oxidation film layer, the pre- sealing of hole in this part is formed by hydrate mass-energy
The barrier propterty of enough service hoisting materials, and change protective caused by process in subsequent baking and curing process and promote effect
Fruit will continue to reinforce.Embathing time deficiency will cause the sulfuric acid removal in oxidation fenestra insufficient, embathe overlong time and then be easy
Cause the curing process of oxidation film after spray coating to rupture, while pH value is also required to stringent monitoring, will also be caused Ru too low
The corrosion of oxidation film.
Three, it and toasts the product of drip-dry, baking temperature is 80 DEG C~100 DEG C, and the time is 6min~10min.It dries
Roasting purpose is to remove water stain in surface and microporous barrier, avoids polluting the upper silane coating of follow-up spraying, and on dry surface
Preferably infiltration.Baking temperature is low or the time is too short, easily remains more moisture in microporous barrier, baking temperature be more than 80 DEG C or
The long then waste of energy of baking time.
Four, (10000 grades of cleanliness factor or more) sprays deployed silane system coating, painting environments temperature in pure room environmental
At 16-20 DEG C, relative humidity is controlled in 45%-70% for degree control, and using aerial spraying, the small-bore spray guns of 0.5mm-0.8mm are empty
Atmospheric pressure 4-6kg/cm2；Discharge-amount is in 80-100ml/min, and rifle is away from 20-30cm, and spray gun movement speed is in 30-60cm/s, 20-
40% covering；The above spray parameters do a little adjustment according to practical spraying situation, avoid thin spray, current mark；By this spray parameters institute
Obtained dried film is about at 2-5 μm, it should be noted that the temperature of spray booth, the too low viscosity that can reduce coating cannot
Ideal levelling and smooth appearance are obtained, it is excessively high, it is easy to cause that deployed coating is too fast to be denaturalized, to
The combination of influence and anodized coating, leads to that the composite film being firmly combined with cannot be formed.
Five, then the workpiece that required surface spraying is completed is positioned in clean room environment and carries out levelling, dodges dry, environment temperature
Degree is 45-55 DEG C, and relative humidity is controlled in 35%-55%, flash-off time 6-8min；It dodges dry temperature and is higher than room temperature.
Six, dry product will be dodged after to toast, baking temperature is 160 DEG C~180 DEG C, and the time is 20min~25min,
The baking temperature is solidification temperature needed for coating, while in the oxidation film layer of internal layer, when higher temperature is conducive to make sealing of hole
The Bayer body of three more loose hydration alundum (Al2O3)s of generation changes the vigorous nurse body to form a fine and close hydration, to increase pair
The resistivity of general corrosion medium.Because the coefficient of expansion of oxidation film layer, silane inorganic film and bulk aluminum is different,
Therefore excessively high temperature can increase the risk that film layer expands to disengage from matrix 1.Temperature is too low, cannot reach above-mentioned solidification and Bayer
Body transition effect.Time is 20-30min, it is long easily make film layer become fragile too short then curing reaction it is insufficient influence film layer performance；
In order to avoid other impurities pollute surface layer, cleanliness factor is also required that at 10000 grades or more in oven.
Specific embodiment described herein is only an example for the spirit of the invention.Technology belonging to the present invention is led
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
Generation, defined range that however, it does not deviate from the spirit of the invention.
Claims (2)
1. a kind of alkaline-resisting Alcoa surface composite coating technique carries out conventional anodized in aluminum alloy surface,
It is characterized in that, spraying, levelling, sudden strain of a muscle of the semi-finished product of the aluminum or aluminum alloy after anodic oxidation using silane system coating and process
To form one or more layers firm additional organosilane coating after dry, baking procedure processing, and promote sun in the process
The molecule structure change of pole oxidation film layer internal layer, and thus obtain the duplex film of anode oxidation membrane and organosilane coating combination
Layer is used as the final protective layer of aluminum or aluminum alloy matrix, and silane system coating includes epoxy modified silicone resin component and methyl-prop
E pioic acid methyl ester component, epoxy modified silicone resin and methyl methacrylate press 68：32 ratio mixing, this is epoxy-modified to have
Solid content effective mass fraction of solids of the machine silicones before mixing, dilution is 45%-65%, is diluted to and is applied using diluent
Work viscosity, silane system coating adjust viscosity and are measured as 7-9 seconds under the conditions of 23 ± 2 DEG C of temperature with NK-2 glasss of IWATA, coating tune
With for water white transparency state；The semi-finished product of aluminium alloy anode oxide are carried out pure water to wash, baking temperature is when pure water toasts after washing
65 DEG C~75 DEG C, the time is 6min~10min, and deployed silane system coating, painting environments temperature are sprayed in pure room environmental
At 16-20 DEG C, relative humidity is controlled in 45%-70% for degree control, and using aerial spraying, the small-bore spray guns of 0.5mm-0.8mm are empty
Atmospheric pressure 4-6kg/cm2；Discharge-amount is in 80-100ml/min, and rifle is away from 20-30cm, and spray gun movement speed is in 30-60cm/s, 20-
40% covering；Then the workpiece that required surface spraying is completed is positioned in clean room environment and carries out levelling, dodges dry, environment temperature
It it is 45-55 DEG C, relative humidity is controlled in 35%-55%, flash-off time 6-8min；Dry product will be finally dodged to toast,
Baking temperature is 160 DEG C~180 DEG C, and the time is 20min~25min.
2. a kind of alkaline-resisting Alcoa surface composite coating technique according to claim 1, it is characterised in that：It will be above-mentioned
The semi-finished product of aluminium alloy anode oxide carry out pure water and wash, it is desirable that are pH：3.0~7.0, when embathing：4min~5min embathes temperature
Degree：60 DEG C~80 DEG C, the conductivity of hot pure water is less than 20 μ s/m.
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| CN105295469A (en) * | 2015-11-27 | 2016-02-03 | 常熟市晓轶金属配件厂 | Cloth cutter holder for textile machinery |
| CN107587177A (en) * | 2017-09-22 | 2018-01-16 | 安徽霍山龙鑫金属科技有限公司 | A kind of aluminum alloy surface deactivating process for the treatment of |
| CN109127332B (en) * | 2018-07-23 | 2020-08-21 | 中南大学 | Corrosion-resistant and high-temperature-resistant ceramic-organic composite coating, preparation method thereof and application of corrosion-resistant and high-temperature-resistant ceramic-organic composite coating as metal corrosion-resistant coating |
| CN111206275B (en) * | 2020-02-17 | 2021-04-06 | 王勇 | Strong acid and strong basicity resistant hole sealing treatment method for aluminum alloy anodic oxide film |
| CN111844924B (en) * | 2020-06-10 | 2022-07-26 | 浙江邦德管业有限公司 | PVC (polyvinyl chloride) power protection composite pipe and preparation method thereof |
| CN114351211B (en) * | 2021-12-18 | 2023-08-18 | 上海澜枫汽车零部件有限公司 | Processing technology of aluminum alloy base material |
| CN114214624B (en) * | 2021-12-20 | 2023-05-12 | 中国兵器工业第五九研究所 | Preparation method of composite coating of steel material |
| CN114381777A (en) * | 2021-12-20 | 2022-04-22 | 佛山泰铝新材料有限公司 | Aluminum alloy anodic oxidation composite sealing method |
| CN115805183A (en) * | 2022-11-01 | 2023-03-17 | 佛山泰铝新材料有限公司 | Production method of curtain wall aluminum plate oxidation coating film |
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| US7713768B2 (en) * | 2006-06-14 | 2010-05-11 | Kanagawa Academy Of Science And Technology | Anti-reflective film and production method thereof, and stamper for producing anti-reflective film and production method thereof |
| CN101649481A (en) * | 2008-08-14 | 2010-02-17 | 深圳富泰宏精密工业有限公司 | Method for sealing micro-arc oxidation films |
| CN103215630B (en) * | 2013-04-23 | 2016-01-20 | 沈阳理工大学 | The method in aluminium alloy anode oxide film hole is closed with inorganic-organic composite silicon colloidal sol |
| CN103469277B (en) * | 2013-08-15 | 2016-06-22 | 嘉兴兴禾汽车零部件有限公司 | A kind of anodic oxidation method for sealing of car aluminum or aluminium alloy part |
| CN103589338A (en) * | 2013-10-21 | 2014-02-19 | 昆山市奋发绝缘材料有限公司 | Novel insulating paint for electrical parts and preparation method thereof |
| CN104626453A (en) * | 2014-12-05 | 2015-05-20 | 博罗县东明化工有限公司 | Preparation method of aluminum alloy resin composite body and aluminum alloy resin composite body |
| CN104672966A (en) * | 2015-03-12 | 2015-06-03 | 江苏欣安新材料技术有限公司 | Coating used on surface of aluminum alloy, and preparation method of coating |
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2015
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Application publication date: 20151007 Assignee: JIANGSU HEXING AUTOMOTIVE TECHNOLOGY Co.,Ltd. Assignor: NINGBO MINTH AUTOMOTIVE PARTS RESEARCH&DEVELOPMENT Co.,Ltd. Contract record no.: X2020330000094 Denomination of invention: A kind of composite coating on the surface of alkali resistant and corrosion resistant aluminum alloy and its process Granted publication date: 20181016 License type: Exclusive License Record date: 20201111 |
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