CN103184447A - Aluminum and aluminum alloy surface self-repairing and corrosion-resisting conversion coating and preparation method thereof - Google Patents
Aluminum and aluminum alloy surface self-repairing and corrosion-resisting conversion coating and preparation method thereof Download PDFInfo
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- CN103184447A CN103184447A CN2013101006443A CN201310100644A CN103184447A CN 103184447 A CN103184447 A CN 103184447A CN 2013101006443 A CN2013101006443 A CN 2013101006443A CN 201310100644 A CN201310100644 A CN 201310100644A CN 103184447 A CN103184447 A CN 103184447A
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims description 37
- 229910000838 Al alloy Inorganic materials 0.000 title abstract description 11
- 238000007739 conversion coating Methods 0.000 title abstract 2
- 238000006243 chemical reaction Methods 0.000 claims abstract description 116
- 229960001545 hydrotalcite Drugs 0.000 claims abstract description 43
- 229910001701 hydrotalcite Inorganic materials 0.000 claims abstract description 43
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 33
- 238000005260 corrosion Methods 0.000 claims abstract description 31
- 230000007797 corrosion Effects 0.000 claims abstract description 31
- 238000000576 coating method Methods 0.000 claims abstract description 28
- 239000011248 coating agent Substances 0.000 claims abstract description 27
- 150000001875 compounds Chemical class 0.000 claims description 42
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 39
- 239000011777 magnesium Substances 0.000 claims description 39
- 229910052749 magnesium Inorganic materials 0.000 claims description 39
- 239000004411 aluminium Substances 0.000 claims description 31
- 239000000956 alloy Substances 0.000 claims description 30
- 229910045601 alloy Inorganic materials 0.000 claims description 30
- 239000012530 fluid Substances 0.000 claims description 18
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 238000005406 washing Methods 0.000 claims description 15
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 claims description 14
- MCJGNVYPOGVAJF-UHFFFAOYSA-N quinolin-8-ol Chemical compound C1=CN=C2C(O)=CC=CC2=C1 MCJGNVYPOGVAJF-UHFFFAOYSA-N 0.000 claims description 13
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 10
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 claims description 8
- 238000005516 engineering process Methods 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 7
- 238000002203 pretreatment Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 5
- 244000137852 Petrea volubilis Species 0.000 claims description 5
- 229910021529 ammonia Inorganic materials 0.000 claims description 5
- PRORZGWHZXZQMV-UHFFFAOYSA-N azane;nitric acid Chemical compound N.O[N+]([O-])=O PRORZGWHZXZQMV-UHFFFAOYSA-N 0.000 claims description 5
- 238000002242 deionisation method Methods 0.000 claims description 5
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 5
- 230000001131 transforming effect Effects 0.000 claims description 3
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 claims description 2
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 2
- 239000006101 laboratory sample Substances 0.000 claims description 2
- 239000011159 matrix material Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 150000004880 oxines Chemical class 0.000 claims description 2
- 239000000758 substrate Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 15
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 abstract description 8
- GDVKFRBCXAPAQJ-UHFFFAOYSA-A dialuminum;hexamagnesium;carbonate;hexadecahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Al+3].[Al+3].[O-]C([O-])=O GDVKFRBCXAPAQJ-UHFFFAOYSA-A 0.000 abstract description 4
- 239000011780 sodium chloride Substances 0.000 abstract description 4
- 239000002131 composite material Substances 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 229910001051 Magnalium Inorganic materials 0.000 abstract 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 abstract 1
- 239000011247 coating layer Substances 0.000 abstract 1
- 238000005265 energy consumption Methods 0.000 abstract 1
- 230000002349 favourable effect Effects 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 150000003839 salts Chemical class 0.000 description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052761 rare earth metal Inorganic materials 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000002421 anti-septic effect Effects 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- PBYZMCDFOULPGH-UHFFFAOYSA-N tungstate Chemical compound [O-][W]([O-])(=O)=O PBYZMCDFOULPGH-UHFFFAOYSA-N 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- IOYNQIMAUDJVEI-BMVIKAAMSA-N Tepraloxydim Chemical compound C1C(=O)C(C(=N/OC\C=C\Cl)/CC)=C(O)CC1C1CCOCC1 IOYNQIMAUDJVEI-BMVIKAAMSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000000840 electrochemical analysis Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- MEFBJEMVZONFCJ-UHFFFAOYSA-N molybdate Chemical compound [O-][Mo]([O-])(=O)=O MEFBJEMVZONFCJ-UHFFFAOYSA-N 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- -1 rare earth metal salt Chemical class 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229940071182 stannate Drugs 0.000 description 1
- 125000005402 stannate group Chemical group 0.000 description 1
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Abstract
The invention belongs to the field of corrosion protection application of coating. An aluminum and aluminum alloy self-repairing and corrosion-resisting composite conversion coating is prepared by that a magnalium hydrotalcite layered structure is grown on an aluminum and aluminum alloy basal body, 8-chinosol for conversion is adopted for conversion, the molar concentration of 8-chinosol is 0.01 to 0.03 mol/L, PH ranges between 10.5 and 12.5, and conversion for 12 to 48 hours is performed at a room temperature. The coating ensures that the corrosion resisting performance of a metal basal body can be remarkably improved, the density of corrosion current is lowered by one order of magnitude, meanwhile, the coating has an excellent self-repairing and corrosion-resisting performance, after being soaked in 3.5 percent of NaCl for 7 days, the impedance of the converted coating is increased by one order of magnitude by compared with a coating not converted. The method adopting the scheme is simple to operate, the cost is low, the energy consumption is small, mass production can be carried out, a chromate process coating layer on an aluminum alloy surface can be replaced, and the coating and the method have a favorable application prospect.
Description
Technical field
The present invention relates to the anticorrosion conversion film preparation method of a kind of aluminium and alloy surface thereof, belong to the synthetic and anticorrosion invention Application Areas of coated material of material.
Background technology
Aluminium and alloy thereof are most widely used class non-ferrous metal structured materials in the industry, are used widely in Aeronautics and Astronautics, automobile, machinofacture, boats and ships aluminium alloy and chemical industry.Usually, in order to satisfy its adaptability and security to environment in application, it is anticorrosion to realize to need to carry out surface treatment before aluminium and alloy thereof are using, and increases the service life.
Wherein, it is the effective means that improves aluminium and alloy anticorrosion performance thereof that chemical conversion is handled, wherein the chromium conversion film shows good Corrosion Protection, yet, the chromium conversion processing can't satisfy the environment friendly requirement, thereby being subjected to more and more stricter restriction, so friendly type conversion treatment process of development environment has great promoter action to the application of aluminium and alloy thereof.At present, the Chrome-free conversion film of developing mainly comprises molybdate, tungstate, lithium hydrochlorate, stannate, fluoaluminate, rare earth metal salt and hydrotalcite conversion film etc.A kind of method (CN200910043177.9) for preparing tungstate conversion film in aluminum alloy surface is disclosed as Liu Yali etc.Guo Rui light etc. has been invented a kind of sexavalent chrome and phosphatic environment-friendly type aluminum alloy chemically conversion fluid of not containing, fluoroaluminate conversion film in the aluminum alloy surface generation, not only can under normal temperature condition, operate, rete is fine and close continuously, and has splendid anticorrosion, bond properties (CN200910021275.2).Zhou Mingjie etc. disclose the steps such as curing of a kind of aluminum alloy surface rare earth conversion processing and surface rare earth film.Yet the selfreparing Corrosion Protection of the chemical conversion film of reporting still can't compare favourably with chromic salt, therefore, and the friendly type process of surface treatment of development environment and prepare intelligent erosion shield and remain from now on focus.
Houghite is owing to have a good anionresin performance, and its application in photoelectricity, medicament slow release, water treatment, field such as anticorrosion has caused people's extensive concern.In recent years, existing research is added it in coating to as the inhibiter carrier, realizes the self-healing Corrosion Protection of coating.At present, oxine and salt pair aluminium thereof and alloy thereof have good corrosion inhibition, yet the report about oxine and salt and hydrotalcite composite membrane only limits to its fluorescence property, yet there are no the self-healing antiseptic property report of the compound conversion film of oxine/hydrotalcite.
Summary of the invention
Purpose of the present invention overcomes above-mentioned not enough problem exactly, provides a kind of aluminium and alloy self-healing thereof anticorrosion compound conversion film, is the compound conversion film of oxine and salt thereof and houghite, strengthens this coating to the self-healing Corrosion Protection of aluminium and alloy thereof.Another object of the present invention is to provide a kind of preparation method of self-healing protection against corrosion conversion film, this method is simple, easy handling, and the coating antiseptic performance of preparation is greatly improved.
Realize that the technical scheme that above-mentioned purpose adopts is: the anticorrosion compound conversion film of a kind of aluminium and alloy self-healing thereof, at first in aluminium and alloy substrate growth magnesium aluminum-hydrotalcite synusia structure thereof, transform with oxinate again, wherein the volumetric molar concentration of oxinate is 0.01 ~ 0.03mol/L, pH is 10.5 ~ 12.5, transforms 12-48 hour under the room temperature and makes.
Described thicknesses of layers 5 ~ 30 μ m.
The preparation method of aluminium of the present invention and the compound conversion film of alloy surface self-healing protection against corrosion thereof comprises the preparation of magnesium aluminum-hydrotalcite conversion film and compound conversion film, and concrete technology is as follows:
The first step, magnesium aluminum-hydrotalcite conversion film preparation: aluminium base and alloy are carried out the pre-treatment impurity that degreases, to vertically place the reactor of the mixing solutions that 100ml magnesium nitrate and ammonium nitrate are housed through the metallic matrix of pre-treatment, in 90 ~ 120 ℃ of baking ovens, made even magnesium aluminum-hydrotalcite conversion film in isothermal reaction 12-48 hour, and carried out SEM, EDX, FTIR and XRD and characterize;
The preparation of second step, compound conversion film: get the magnesium aluminum-hydrotalcite conversion film that makes, being placed on pH is 10.5 ~ 12.5, concentration is in the oxine salts solution of 0.01 ~ 0.03mol/L, after transforming 12-48 hour under the room temperature, take out and wash and dry up, finally obtain laboratory sample, carry out SEM, XRD, FTIR sign and corrosion resisting property test.
The described the first step, the preparation of magnesium aluminum-hydrotalcite conversion film: wherein pre-treatment adopts 600,1000,1500, No. 2000 sand paper to polish step by step, and impurity is removed in washing then, ultrasonic cleaning oil removing in Virahol, deionization washing.
The described the first step, the preparation of magnesium aluminum-hydrotalcite conversion film: wherein the molar ratio of magnesium nitrate and nitric acid ammonia is 1:5 ~ 1:10, regulates pH to 9 with weak ammonia.
The preparation of described second step, compound coating: wherein said oxinate conversion fluid is synthetic by following technology, get the oxine solid earlier and place beaker, add deionized water dissolving, regulating conversion fluid pH scope with sodium hydroxide or potassium hydroxide solution again is 10.5 ~ 12.5, be diluted to 0.01 ~ 0.03mol/L at last, make conversion fluid.
The preparation of described second step, compound coating: wherein said compound conversion film is by following prepared: prepared magnesium aluminum-hydrotalcite conversion film is placed above-mentioned conversion fluid, at room temperature transform 12-48 hour, take out and washing, dry up, obtain compound conversion film, carry out SEM, XRD and characterize.
Below the present invention made further specify.
It mainly is to strengthen coating to the Corrosion Protection of aluminium and aluminium alloy that the present invention adopts oxinate to transform the magnesium aluminum-hydrotalcite conversion film, oxine and salt pair aluminium thereof and alloy thereof have good corrosion inhibition, it is easy to transform in the absorption of magnesium aluminum-hydrotalcite conversion film, thereby improves the shielding properties of coating.
The prepared self-healing protection against corrosion conversion film of the present invention is mainly used in aluminium and alloy corrosion-resistant field thereof.This programme method novelty, simple to operate, cost is low, is fit to scale operation.
To sum up advantage of the present invention and positive effect are:
1, to prepare compound conversion film method simple, energy-conservation in the present invention, the thinking novelty;
2, coatings prepared of the present invention is even, fine and close, bonding force is good, and coating self-healing Corrosion Protection is outstanding.
Description of drawings
Fig. 1 is the surface topography map before the magnesium aluminum-hydrotalcite conversion film transforms.
Fig. 2 is the surface topography map after the magnesium aluminum-hydrotalcite conversion film transforms.
Fig. 3 is the variation diagram before the magnesium aluminum-hydrotalcite conversion film transforms.
Fig. 4 is the variation diagram after the magnesium aluminum-hydrotalcite conversion film transforms.
Fig. 5 is the crystalline structure figure before and after the magnesium aluminum-hydrotalcite conversion film transforms.
Fig. 6 is the FTIR figure before and after the magnesium aluminum-hydrotalcite conversion film transforms.
Fig. 7 is the polarization curve before and after the magnesium aluminum-hydrotalcite conversion film transforms.
Fig. 8 is the alternating-current impedance Bode figure before the magnesium aluminum-hydrotalcite conversion film transforms.
Fig. 9 is the alternating-current impedance Bode figure after the magnesium aluminum-hydrotalcite conversion film transforms.
Embodiment
Below introduce content of the present invention in detail for concrete case study on implementation, it is for the ease of understanding the present invention that case study on implementation is provided, and never is the invention of restriction this patent.
The method for making of aluminium and the compound conversion film of alloy surface self-healing protection against corrosion thereof comprises the preparation of magnesium aluminum-hydrotalcite conversion film and compound conversion film, and concrete technology is as follows:
The first step, preparation magnesium aluminum-hydrotalcite conversion film is standby: aluminium and alloy thereof adopt 600,1000,1500, No. 2000 sand paper to polish step by step, and impurity is removed in washing then, ultrasonic cleaning oil removing in Virahol, deionization washing.Be that 1:5 preparation 100ml solution places reactor in magnesium nitrate and nitric acid ammonia ratio, regulate pH to 9 with weak ammonia, aluminium flake is vertically placed reactor, in 100 ℃ of baking ovens, isothermal reaction was taken out after 48 hours, and flushing dries up.
In second step, the preparation of compound conversion film: get the oxine solid earlier and place beaker, add deionized water dissolving, regulating conversion fluid pH with sodium hydroxide solution again is 10.5, is diluted to 0.01mol/L at last, makes conversion fluid; Prepared magnesium aluminum-hydrotalcite conversion film is placed conversion fluid, at room temperature transform 24 hours, take out and washing, dry up, obtain compound conversion film, carry out SEM, EDX, XRD and FTIR sign and corrosion resisting property test in 3.5% NaCl solution.
The method for making of aluminium and the compound conversion film of alloy surface self-healing protection against corrosion thereof comprises the preparation of magnesium aluminum-hydrotalcite conversion film and compound conversion film, and concrete technology is as follows:
The first step, preparation magnesium aluminum-hydrotalcite conversion film is standby: aluminium and alloy thereof adopt 600,1000,1500, No. 2000 sand paper to polish step by step, and impurity is removed in washing then, ultrasonic cleaning oil removing in Virahol, deionization washing.Be that 1:7 preparation 100ml solution places reactor in magnesium nitrate and nitric acid ammonia ratio, regulate pH to 9 with weak ammonia, aluminium flake is vertically placed reactor, in 90 ℃ of baking ovens, isothermal reaction was taken out after 48 hours, and flushing dries up.
In second step, the preparation of compound conversion film: get the oxine solid earlier and place beaker, add deionized water dissolving, regulating conversion fluid pH with sodium hydroxide solution again is 11, and being diluted to concentration at last is 0.02mol/L, makes conversion fluid; Prepared magnesium aluminum-hydrotalcite conversion film is placed conversion fluid, at room temperature transform 12 hours, take out and washing, dry up, obtain compound conversion film, carry out SEM, EDX, XRD and FTIR sign and corrosion resisting property test in 3.5% NaCl solution.
The method for making of aluminium and the compound conversion film of alloy surface self-healing protection against corrosion thereof comprises the preparation of magnesium aluminum-hydrotalcite conversion film and compound conversion film, and concrete technology is as follows:
The first step, preparation magnesium aluminum-hydrotalcite conversion film is standby: aluminium and alloy thereof adopt 600,1000,1500, No. 2000 sand paper to polish step by step, and impurity is removed in washing then, ultrasonic cleaning oil removing in Virahol, deionization washing.Be that 1:10 preparation 100ml solution places reactor in magnesium nitrate and nitric acid ammonia ratio, regulate pH to 9 with weak ammonia, aluminium flake is vertically placed reactor, in 120 ℃ of baking ovens, isothermal reaction was taken out after 48 hours, and flushing dries up.
In second step, the preparation of compound conversion film: get the oxine solid earlier and place beaker, add deionized water dissolving, regulating conversion fluid pH with sodium hydroxide solution again is 12, is diluted to concentration 0.03mol/L at last, makes conversion fluid; Prepared magnesium aluminum-hydrotalcite conversion film is placed conversion fluid, at room temperature transform 48 hours, take out and washing, dry up, obtain compound conversion film, carry out SEM, EDX, XRD and FTIR sign and corrosion resisting property test in 3.5% NaCl solution.
Adopt the detection of the prepared coating of the inventive method to comprise:
(1) compound conversion film microscopic appearance and composition analysis: by the JSM-6360LV scanning electron microscopic observation of Japan
(2) compound conversion film crystal structure analysis: by the D/MAX-2400 X-ray diffractometer test of Japan
(3) compound conversion film bond structure is analyzed: by the EQUINOX 55 Fourier infrared spectrums test of Germany
(4) compound conversion film electrochemical analysis: detected by Shanghai China CHI660D in morning electrochemical workstation
Fig. 1 to Fig. 4 illustrates that coating transforms its pattern of front and back and all is the distribution of synusia shape, and considerable change does not take place membranous layer ingredient.
Fig. 5 illustrates before coating transforms and shows tangible hydrotalcite-like compound feature, transforms the back coating considerable change has taken place, and has lost the characteristic feature of houghite.
Fig. 6 illustrates that coating transforms the back tangible oxine of performance and houghite bond structure feature, illustrates that oxine has transformed to enter coating.
Fig. 7 shows that the erosion rate before and after the conversion of magnesium aluminum-hydrotalcite conversion film oxinate is respectively 1.14 * 10
-2With 9.24 * 10
-4μ A.cm
-2, the unconverted relatively coating of erosion rate has reduced an order of magnitude, illustrates that oxine transforms the back corrosion resistance of coating and obviously improves.
Fig. 8 and Fig. 9 are the alternating-current impedance Bode figure before and after the magnesium aluminum-hydrotalcite conversion film transforms, and figure medium-high frequency section is main relevant with porous electric capacity, and Mid Frequency is main relevant with porous layer resistance, and low-frequency range is main relevant with barrier-layer capacity.Usually low-frequency range has directly determined the performance on blocking layer.The magnesium aluminum-hydrotalcite conversion film is in immersion process, and considerable change does not take place the impedance maximum value, and maximum value is: 4.7 * 10
5Ω cm
2, and the coating of oxinate after transforming be along with the increase of soak time, its impedance is the trend of increase, by the 1st day 1.70 * 10
6Ω cm
2Increase to the 9th day 2.25 * 10
6Ω cm
2, illustrate that oxinate transforms after, the coating corrosion resistance nature obviously improves.
Above-mentioned concrete embodiment is for characteristics of the present invention are described; case study on implementation has been introduced inventive concept; time, temperature and the working method of experiment reaction; but can not limit claim of the present invention, other is any not to deviate from technical scheme of the present invention and is included within protection scope of the present invention.
Claims (7)
1. an aluminium and the anticorrosion compound conversion film of alloy self-healing thereof, it is characterized in that: at first in aluminium and alloy substrate growth magnesium aluminum-hydrotalcite synusia structure thereof, transform with oxinate again, wherein the volumetric molar concentration of oxinate is 0.01 ~ 0.03mol/L, pH is 10.5 ~ 12.5, transforms 12-48 hour under the room temperature and makes.
2. the anticorrosion compound conversion film of a kind of aluminium according to claim 1 and alloy self-healing thereof is characterized in that: described thicknesses of layers 5 ~ 30 μ m.
3. the preparation method of aluminium and the compound conversion film of alloy surface self-healing protection against corrosion thereof is characterized in that: comprise the preparation of magnesium aluminum-hydrotalcite conversion film and compound conversion film, concrete technology is as follows:
The first step, magnesium aluminum-hydrotalcite conversion film preparation: aluminium base and alloy are carried out the pre-treatment impurity that degreases, to vertically place the reactor of the mixing solutions that 100ml magnesium nitrate and ammonium nitrate are housed through the metallic matrix of pre-treatment, in 90 ~ 120 ℃ of baking ovens, made even magnesium aluminum-hydrotalcite conversion film in isothermal reaction 12-48 hour, and carried out SEM, EDX, FTIR and XRD and characterize;
The preparation of second step, compound conversion film: get the magnesium aluminum-hydrotalcite conversion film that makes, being placed on pH is 10.5 ~ 12.5, concentration is in the oxine salts solution of 0.01 ~ 0.03mol/L, after transforming 12-48 hour under the room temperature, take out and wash and dry up, finally obtain laboratory sample, carry out SEM, XRD, FTIR sign and corrosion resisting property test.
4. the preparation method of aluminium according to claim 3 and the compound conversion film of alloy surface self-healing protection against corrosion thereof, it is characterized in that: the described the first step, the preparation of magnesium aluminum-hydrotalcite conversion film: wherein pre-treatment adopts 600,1000,1500, No. 2000 sand paper to polish step by step, impurity is removed in washing then, ultrasonic cleaning oil removing in Virahol, the deionization washing.
5. the preparation method of aluminium according to claim 3 and the compound conversion film of alloy surface self-healing protection against corrosion thereof, it is characterized in that: the described the first step, the preparation of magnesium aluminum-hydrotalcite conversion film: wherein the molar ratio of magnesium nitrate and nitric acid ammonia is 1:5 ~ 1:10, regulates pH to 9 with 1% weak ammonia.
6. the preparation method of aluminium according to claim 3 and the compound conversion film of alloy surface self-healing protection against corrosion thereof, it is characterized in that: the preparation of described second step, compound coating: wherein said oxinate conversion fluid is synthetic by following technology, get the oxine solid earlier and place beaker, add deionized water dissolving, regulating conversion fluid pH scope with sodium hydroxide or potassium hydroxide solution again is 10.5 ~ 12.5, be diluted to 0.01 ~ 0.03mol/L at last, make conversion fluid.
7. the preparation method of aluminium according to claim 3 and the compound conversion film of alloy surface self-healing protection against corrosion thereof, it is characterized in that: the preparation of described second step, compound coating: wherein said compound conversion film is by following prepared: prepared magnesium aluminum-hydrotalcite conversion film is placed above-mentioned conversion fluid, at room temperature transform 12-48 hour, take out and washing, dry up, obtain compound conversion film, carry out SEM, XRD and characterize.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108330472A (en) * | 2018-02-05 | 2018-07-27 | 西华师范大学 | A method of the double hydroxy metal oxide coating corrosion resistances of enhancing Mg alloy surface |
| CN108531903A (en) * | 2018-03-20 | 2018-09-14 | 西华师范大学 | A method of so that Mg alloy surface hydrotalcite coating is suitable for acidic environment |
| CN110402960A (en) * | 2019-04-29 | 2019-11-05 | 中国科学院海洋研究所 | A kind of Ti3+- LDH intercalation corrosion inhibiter compound and its application |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108330472A (en) * | 2018-02-05 | 2018-07-27 | 西华师范大学 | A method of the double hydroxy metal oxide coating corrosion resistances of enhancing Mg alloy surface |
| CN108531903A (en) * | 2018-03-20 | 2018-09-14 | 西华师范大学 | A method of so that Mg alloy surface hydrotalcite coating is suitable for acidic environment |
| CN110402960A (en) * | 2019-04-29 | 2019-11-05 | 中国科学院海洋研究所 | A kind of Ti3+- LDH intercalation corrosion inhibiter compound and its application |
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