CN109989090A - A method of corrosion stability of magnesium alloy film layer is prepared using superslide surface - Google Patents
A method of corrosion stability of magnesium alloy film layer is prepared using superslide surface Download PDFInfo
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- CN109989090A CN109989090A CN201910354457.5A CN201910354457A CN109989090A CN 109989090 A CN109989090 A CN 109989090A CN 201910354457 A CN201910354457 A CN 201910354457A CN 109989090 A CN109989090 A CN 109989090A
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- 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
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- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
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- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
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- C25D11/30—Anodisation of magnesium or alloys based thereon
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Abstract
The present invention relates to a kind of methods for preparing corrosion stability of magnesium alloy film layer using superslide surface, belong to metal surface properties modification field.Corrosion Resistant Film of the invention is using magnesium alloy as matrix, micron order cavernous structure is constructed in Mg alloy surface by the way of differential arc oxidation (MAO) first, LDH (layered double-hydroxide) processing is secondly carried out at high temperature and obtains flake nano structure；It is modified again with low-surface energy substance, obtains super hydrophobic surface；Finally injection lubricating oil obtains superslide surface.The present invention provides a kind of easy to operate, does not need the preparation method of the corrosion stability of magnesium alloy film layer of special installation.MAO, LDH, super-hydrophobic technology and superslide surface are combined and prepare composite film in Mg alloy surface, can effectively prevent water droplet in the delay on surface, and then improves the corrosion resistance of magnesium alloy.
Description
Technical field
The present invention relates to a kind of methods for preparing corrosion stability of magnesium alloy film layer using superslide surface, belong to metal material surface
Modified field.
Background technique
Magnesium alloy has low-density, higher specific strength and specific stiffness, the elasticity modulus that shock absorption is significant, low, Yi Jiliang
It the advantages that recyclable regenerability got well, is used widely in fields such as automobile, electric appliance, electronic product, aerospace industries.
But magnesium alloy, since standard electrode potential is very negative (- 2.37V), chemical activity is very high, in moist environment and contains Cl-Non- alkali
Easily corrode in property solution medium.In air, surface can generate oxidation film to magnesium alloy, but oxidation fenestra generated
Gap rate is big, consistency is low, cannot provide matrix and be effectively protected, corrosion resistance is very poor, largely limits magnesium alloy
Engineer application range.In order to solve the problems, such as that magnesium alloy is perishable, need effectively to be surface-treated magnesium alloy.
Hydrophobic membrane is a kind of based on the rise of bionical effect.Lotus was just praised from ancient times as " out mud without contaminate ", it this
Kind self-cleaning phenomenon is referred to as " lotus leaf effect " in science, is widely paid close attention at present.The corrosion for solving magnesium alloy can
It is contacted with corrosion resistance (2) the cutting magnesium alloy that (1) from two aspects increases magnesium alloy itself with the environment of corrosion is easily caused.
Consider that we first prepare in Mg alloy surface the film layer of one layer of rotproofness first, then again carry out the film layer from these two aspects
Silicic acid anhydride can greatly improve the corrosion resistance of magnesium alloy.Therefore corrosion stability of magnesium alloy hydrophobic membrane is prepared to not only increase
The corrosion resistance of magnesium alloy itself, while the preparation of hydrophobic membrane makes it possess hydrophobicity and certain property settled accounts certainly, makes magnesium alloy more
What is added is not perishable, this is to the very high value of the specific practical Ying Youyou of magnesium alloy.
Differential arc oxidation is also known as plasma oxidation, is a kind of new technology in non-ferrous metal surface growth in situ ceramic membrane.It is micro-
Arc oxidation is evolved by anodic oxidation, and using high voltage, the faraday area that common anode aoxidizes is introduced into electrion
Area can form one layer of higher ceramic coating of bond strength in the metals such as Al, Mg, Ti and its alloy surface.Magnesium alloy is through micro-
After arc oxidation processes, surface has uniform and intensive micron order cavernous structure, and local stress effect cracks, needs to carry out
Subsequent processing is to obtain micro-nano structure and covering face crack.
Layered double-hydroxide (LDH) can absorb anion because of its unique structure and chemical component in corrosive environment
With release inhibitor, the corrosion resistance of material is significantly improved.Generally speaking, the composition of LDH can be write as a general formula [M2+ 1-xM3 + x(OH)2 x+Am- x/mNH2O, wherein M2+And M3+Represent divalent and trivalent metal cation, Am-Represent tradable anion.
In recent years, LDH is research shows that can be used as the super hydrophobic material of the contact area of reduction and corrosive medium, to parent metal progress
LDH processing, can obtain hydrophilic nanostructure film layer.
Currently, there has been no experiments to study the influence of micrometer structure and micro-nano compound structure to superslide surface durability.In
A kind of method for preventing metal atmospheric corrosion using artificial imitative common nepenthes superslide surface, is adopted disclosed in state patent CN103966641A
Deliquesced with salt grain experiments have shown that caused by the reasons such as imitative common nepenthes superslide surface can prevent to deliquesce because of salinity water droplet in surface detention,
Reduce the probability that the atmospheric corrosion of metal occurs.Liquid injection type superslide surface disclosed in Chinese patent CN106865487A and its
Laser accurate micro-processing method, using test droplets include water droplet, acid solution, aqueous slkali, lake water, seawater, serum, glycerol and kind
Ketchup, it was demonstrated that prepared superslide surface has very little frictional resistance, reduces the test liquid such as water droplet in the residence time on surface
With probability.By above-mentioned technology it is found that soil resistance and anti-atmospheric corrosion research to superslide surface are more, but for Dynamic Corrosion item
Influence of the part to superslide surface is rarely reported.
Summary of the invention
The object of the present invention is to provide a kind of method for preparing corrosion stability of magnesium alloy film layer using superslide surface, this method institutes
With equipment is simple, treatment process is easily achieved, the corrosion resisting property of magnesium alloy can be effectively improved.
To achieve the goals above, technical solution of the present invention is specific as follows:
A method of corrosion stability of magnesium alloy film layer is prepared using superslide surface, which is characterized in that uses differential of the arc oxygen first
The mode for changing (MAO) constructs micron order cavernous structure in Mg alloy surface, secondly carries out LDH (the double hydrogen-oxygens of stratiform at high temperature
Compound) processing obtain flake nano structure；It is modified again with low-surface energy substance, obtains super hydrophobic surface；Finally injection profit
Lubricating oil obtains superslide surface.
A kind of preparation method of Mg alloy surface Corrosion Resistant Film, specifically includes the following steps:
Step 1 will be placed in the electrolyte of silicate systems by pretreated magnesium alloy, and magnesium alloy is as anode, no
Steel plate become rusty as cathode, carries out MAO (differential arc oxidation) processing；
Step 2, by the obtained magnesium alloy differential arc oxidation sample of step 1 processing immerse under nine water aluminum nitrate solution high temperatures into
Row LDH (layered double-hydroxide) processing；
Step 3, with low-surface energy substance 1H, 1H, 2H, the sample that 2H- perfluoro capryl triethoxysilane obtains step 2
It is modified, forms super-hydrophobic film layer.
Excessive perfluoropolyether is added dropwise to above-mentioned surface by step 4, and sample tilts 30 °, is placed 2 hours, is finally stablized
Superslide surface.
The features of the present invention also characterized in that:
The preprocessing process of magnesium alloy described in step 1 are as follows: magnesium alloy is successively used into 400#, 800#, 1000#, 1200#
SiC sand paper polishes to surface and edge, uses 10~15min of dehydrated alcohol and deionized water ultrasonic cleaning respectively.
Each component content of the electrolyte of silicate systems described in step 1 is respectively as follows: 8~10g/L of sodium metasilicate, sodium hydroxide
2~5g/L, 0.5~2g/L of sodium fluoride.
Differential arc oxidation parameter described in step 1 are as follows: 5~10A/dm of current density2, 400~500Hz of frequency, duty ratio
20~30%, 5~10min of differential arc oxidation time.
Nine water aluminum nitrate solution concentration described in step 2 are 0.01~0.02mol/L, are adjusted to pH value using NaOH
12.5。
LDH treatment conditions described in step 2 are as follows: temperature 60 C~120 DEG C, 3~12h of time.
1H described in step 3,1H, the concentration of 2H, 2H- are as follows: distilled water: ethyl alcohol: 1H, 1H, 2H, 2H- perfluoro capryl three
The volume ratio of Ethoxysilane is 100:200:1.
Modification mode described in step 3: 2h is impregnated at room temperature.
The beneficial effects of the present invention are:
(1) magnesium alloy differential arc oxidation pre-treating technology of the present invention is simple, and the period is short, and the micro-arc oxidation electrolyte of use is in alkali
Property, it is environmentally friendly, and can be mass.
(2) present invention utilizes the uniform rule of gained after the micron order hole of MAO film surface and subsequent progress LDH processing
Flake nano structure forms micro-nano compound structure essential to super-hydrophobic processing and superslide surface.
(3) present invention combines MAO, LDH, super-hydrophobic technology, superslide surface, and above one layer of every tunic layer is
Basis, binding force is higher, and under the conditions of Dynamic Corrosion, lubricating oil is not easy to be flushed away.
Detailed description of the invention
Fig. 1 a is 2000 times of scanning electron microscope (SEM) photographs of the resulting micron order cavernous structure of MAO in embodiment 1 and comparative example 1.
B, c be respectively in embodiment 1 magnesium alloy through MAO and LDH processing gained 8000 times of micro-nano compound structure, 50000
Times scanning electron microscope (SEM) photograph.
Fig. 2 a, b be respectively under the conditions of 1000r/min after Dynamic Corrosion 5min water droplet in embodiment 1 and 1 gained sample of comparative example
Product surface sliding process.
Specific embodiment
The present invention is further illustrated below by embodiment, but is not limited to following embodiment.
Embodiment 1
(1) in this example, Mg-Al-Zn system Mg alloy AZ91 blocky (15 × 15 × 6mm) is selected to be used as laboratory sample.Point
It is not polished successively with the SiC sand paper of 400#, 800#, 1000#, 1200# to remove the oxide on surface layer and other impurities, then will
It, which is put into dehydrated alcohol, is cleaned by ultrasonic 15min, places into and is cleaned by ultrasonic 15min in deionized water, to reach degreasing decontamination
Effect；
(2) magnesium alloy obtained to step (1) carries out micro-arc oxidation treatment, using the electrolyte of silicate systems, respectively at
Point content is respectively as follows: sodium metasilicate 8g/L, sodium hydroxide 2g/L, sodium fluoride 0.5g/L.Differential arc oxidation parameter are as follows: current density 5A/
dm2, frequency 500Hz, duty ratio 20%, differential arc oxidation time 10min, taking-up, deionized water, which is rinsed, dries, and obtains micron order hole
Shape structure (Fig. 1 a).
(3) the magnesium alloy differential arc oxidation sample of step (2) is immersed and carries out LDH (layer under nine water aluminum nitrate solution high temperatures
Shape double-hydroxide) processing, LDH treatment conditions are as follows: temperature 60 C, time 12h.
(4) configuration 1H, 1H, 2H, 2H- perfluoro capryl triethoxysilane composite solution, distilled water: ethyl alcohol: 1H, 1H, 2H,
The volume of 2H- perfluoro capryl triethoxysilane is 100ml:200ml:1ml, and said sample impregnates 2h at room temperature, takes out drying.
(5) upper 10 microlitres of perfluoropolyether are dripped on said sample surface, after spin coating is uniform, tilts 30 °, stands 2h.
0.05% film forming accelerating can be added in step 2 above, film forming accelerating is butadiene-styrene rubber or carbohydrazide, drop
Low arcing voltage improves quality of forming film.
Embodiment 2
(1) in this example, Mg-Al-Zn system Mg alloy AZ91 blocky (15 × 15 × 6mm) is selected to be used as laboratory sample.Point
It is not polished successively with the SiC sand paper of 400#, 800#, 1000#, 1200# to remove the oxide on surface layer and other impurities, then will
It, which is put into dehydrated alcohol, is cleaned by ultrasonic 10min, places into and is cleaned by ultrasonic 15min in deionized water, to reach degreasing decontamination
Effect；
(2) magnesium alloy obtained to step (1) carries out micro-arc oxidation treatment, using the electrolyte of silicate systems, respectively at
Point content is respectively as follows: sodium metasilicate 9g/L, sodium hydroxide 3g/L, sodium fluoride 1g/L.Differential arc oxidation parameter are as follows: current density 7A/
dm2, frequency 400Hz, duty ratio 30%, differential arc oxidation time 5min, taking-up, deionized water, which is rinsed, dries, and obtains micron order hole
Shape structure.
(3) the magnesium alloy differential arc oxidation sample of step (2) is immersed and carries out LDH (layer under nine water aluminum nitrate solution high temperatures
Shape double-hydroxide) processing, LDH treatment conditions are as follows: 100 DEG C of temperature, time 8h.
(4) configuration 1H, 1H, 2H, 2H- perfluoro capryl triethoxysilane composite solution, distilled water: ethyl alcohol: 1H, 1H, 2H,
The volume of 2H- perfluoro capryl triethoxysilane is 100ml:200ml:1ml, and said sample impregnates 2h at room temperature, takes out drying.
(5) upper 10 microlitres of perfluoropolyether are dripped on said sample surface, after spin coating is uniform, tilts 30 °, stands 2h.
Embodiment 3
(1) in this example, Mg-Al-Zn system Mg alloy AZ91 blocky (15 × 15 × 6mm) is selected to be used as laboratory sample.Point
It is not polished successively with the SiC sand paper of 400#, 800#, 1000#, 1200# to remove the oxide on surface layer and other impurities, then will
It, which is put into dehydrated alcohol, is cleaned by ultrasonic 15min, places into and is cleaned by ultrasonic 10min in deionized water, to reach degreasing decontamination
Effect；
(2) micro-arc oxidation treatment is carried out to said sample, using the electrolyte of silicate systems, each component content difference
Are as follows: sodium metasilicate 10g/L, sodium hydroxide 5g/L, sodium fluoride 2g/L.Differential arc oxidation parameter are as follows: current density 10A/dm2, frequency
450Hz, duty ratio 25%, differential arc oxidation time 7min take out, and deionized water rinses drying, obtain micron order cavernous structure.
(3) the magnesium alloy differential arc oxidation sample of step (2) is immersed and carries out LDH (layer under nine water aluminum nitrate solution high temperatures
Shape double-hydroxide) processing, LDH treatment conditions are as follows: 120 DEG C of temperature, time 3h.
(4) configuration 1H, 1H, 2H, 2H- perfluoro capryl triethoxysilane composite solution, distilled water: ethyl alcohol: 1H, 1H, 2H,
The volume of 2H- perfluoro capryl triethoxysilane is 100ml:200ml:1ml, and said sample impregnates 2h at room temperature, takes out drying.
(5) upper 10 microlitres of perfluoropolyether are dripped on said sample surface, after spin coating is uniform, tilts 30 °, stands 2h.
Correlation data
Sample A:
(1) in this example, Mg-Al-Zn system Mg alloy AZ91 blocky (15 × 15 × 6mm) is selected to be used as laboratory sample.Point
It is not polished successively with the SiC sand paper of 400#, 800#, 1000#, 1200# to remove the oxide on surface layer and other impurities, then will
It, which is put into dehydrated alcohol, is cleaned by ultrasonic 15min, places into and is cleaned by ultrasonic 15min in deionized water, to reach degreasing decontamination
Effect；
(2) micro-arc oxidation treatment is carried out to said sample, using the electrolyte of silicate systems, each component content difference
Are as follows: sodium metasilicate 8g/L, sodium hydroxide 2g/L, sodium fluoride 0.5g/L.Differential arc oxidation parameter are as follows: current density 10A/dm2, frequency
400Hz, duty ratio 20%, differential arc oxidation time 10min take out, and deionized water rinses drying, are denoted as A.
Following characterization has been carried out to the surface topography of magnesium alloy sample A (Mg-MAO) and performance prepared by the present embodiment:
Sample surface morphology: carrying out morphology characterization to sample surfaces using scanning electron microscope, as a result as shown in Figure 1a,
It can be seen that the film surface after micro-arc oxidation treatment is throughout micropore, and has partial pore aperture larger, around generated due to stress
Micro-crack.Numerous defects become the invasive channel of corrosive medium.
Corrosion resisting property: corrosion resistance is carried out to prepared super-hydrophobicity magnesium alloy sample using electrochemical workstation
Test, the resulting corrosion potential of dynamic potential polarization curve of the prepared magnesium alloy sample in 3.5wt%NaCl solution are rotten
Erosion current density is listed in table 1.As shown in Table 1, the magnesium alloy after micro-arc oxidation treatment is relative to AZ91 magnesium alloy substrate, corrosion electricity
Current density reduces 2 orders of magnitude.Illustrate that the film layer plays certain corrosion-resistant protective effect to magnesium alloy.
Sample B
(1) in this example, Mg-Al-Zn system Mg alloy AZ91 blocky (15 × 15 × 6mm) is selected to be used as laboratory sample.Point
It is not polished successively with the SiC sand paper of 400#, 800#, 1000#, 1200# to remove the oxide on surface layer and other impurities, then will
It, which is put into dehydrated alcohol, is cleaned by ultrasonic 15min, places into and is cleaned by ultrasonic 15min in deionized water, to reach degreasing decontamination
Effect；
(2) micro-arc oxidation treatment is carried out to said sample, using the electrolyte of silicate systems, each component content difference
Are as follows: sodium metasilicate 8g/L, sodium hydroxide 2g/L, sodium fluoride 0.5g/L.Differential arc oxidation parameter are as follows: current density 10A/dm2, frequency
400Hz, duty ratio 20%, differential arc oxidation time 10min take out, and deionized water rinses drying.
(3) LDH processing is carried out to said sample, configuration concentration is the nine water aluminum nitrate solutions of 0.02mol/L, using NaOH
PH value is adjusted to 12.5, sample is placed in the reaction kettle that compactedness is 60% and carries out hydro-thermal process, 120 DEG C of holding 12h of temperature.
It takes out boiling water and cleans drying, be denoted as B.
The surface topography and performance of magnesium alloy sample prepared by the present embodiment (Mg-MAO-LDH) have been carried out such as following table
Sign:
Sample surface morphology: using scanning electron microscope to sample surfaces carry out morphology characterization, as a result as shown in Figure 1,
From Fig. 1 b as it can be seen that after LDH processing, MAO film surface micropore size especially macropore diameter reduces, and micro-crack disappears, from Fig. 1 c
It can be seen that, the staggered flake nano structure of stacking is covered with inside the defects of film surface includes micropore.
Corrosion resisting property: corrosion resistance is carried out to prepared super-hydrophobicity magnesium alloy sample using electrochemical workstation
Test, the resulting corrosion potential of dynamic potential polarization curve of the prepared magnesium alloy sample in 3.5wt%NaCl solution are rotten
Lose current density column.Successively through MAO and LDH treated magnesium alloy sample relative to AZ91 magnesium alloy substrate, corrosion current is close
Degree reduces 4 orders of magnitude.Illustrate that the composite film plays excellent corrosion-resistant protective effect to magnesium alloy.
Sample c
(1) in this example, Mg-Al-Zn system Mg alloy AZ91 blocky (15 × 15 × 6mm) is selected to be used as laboratory sample.Point
It is not polished successively with the SiC sand paper of 400#, 800#, 1000#, 1200# to remove the oxide on surface layer and other impurities, then will
It, which is put into dehydrated alcohol, is cleaned by ultrasonic 15min, places into and is cleaned by ultrasonic 15min in deionized water, to reach degreasing decontamination
Effect；
(2) micro-arc oxidation treatment is carried out to said sample, using the electrolyte of silicate systems, each component content difference
Are as follows: sodium metasilicate 8g/L, sodium hydroxide 2g/L, sodium fluoride 0.5g/L.Differential arc oxidation parameter are as follows: current density 10A/dm2, frequency
400Hz, duty ratio 20%, differential arc oxidation time 10min take out, and deionized water rinses drying.
(3) LDH processing is carried out to said sample, configuration concentration is the nine water aluminum nitrate solutions of 0.02mol/L, using NaOH
PH value is adjusted to 12.5, sample is placed in the reaction kettle that compactedness is 60% and carries out hydro-thermal process, 120 DEG C of holding 12h of temperature.
It takes out boiling water and cleans drying.
(4) configuration 1H, 1H, 2H, 2H- perfluoro capryl triethoxysilane composite solution, distilled water: ethyl alcohol: 1H, 1H, 2H,
The volume ratio of 2H- perfluoro capryl triethoxysilane is 100:200:1, and said sample impregnates 2h at room temperature, takes out drying, is denoted as
C。
Surface topography and performance to magnesium alloy sample prepared by the present embodiment (Mg-MAO-LDH- modification) carried out as
Lower characterization:
Ultra-hydrophobicity: measured using contact angle measurement prepared super-hydrophobicity sample surfaces static contact angle and
Roll angle, Static Contact angle value have reached 170.1 °, and roll angle is 0.5 °, according to the definition of super hydrophobic surface, illustrates that sample reaches
Fabulous hydrophobicity is arrived.
Sample d
(1) in this example, Mg-Al-Zn system Mg alloy AZ91 blocky (15 × 15 × 6mm) is selected to be used as laboratory sample.Point
It is not polished successively with the SiC sand paper of 400#, 800#, 1000#, 1200# to remove the oxide on surface layer and other impurities, then will
It, which is put into dehydrated alcohol, is cleaned by ultrasonic 15min, places into and is cleaned by ultrasonic 15min in deionized water, to reach degreasing decontamination
Effect；
(2) micro-arc oxidation treatment is carried out to said sample, using the electrolyte of silicate systems, each component content difference
Are as follows: sodium metasilicate 8g/L, sodium hydroxide 2g/L, sodium fluoride 0.5g/L.Differential arc oxidation parameter are as follows: current density 10A/dm2, frequency
400Hz, duty ratio 20%, differential arc oxidation time 10min take out, and deionized water rinses drying, obtain micron order cavernous structure
(Fig. 1 a).
(3) configuration 1H, 1H, 2H, 2H- perfluoro capryl triethoxysilane composite solution, distilled water: ethyl alcohol: 1H, 1H, 2H,
The volume ratio of 2H- perfluoro capryl triethoxysilane is 100:200:1, and said sample impregnates 2h at room temperature, takes out drying.
(4) upper 10 microlitres of perfluoropolyether are dripped on said sample surface, after spin coating is uniform, tilts 30 °, stands 2h, be denoted as examination
Sample d.
Dynamic Corrosion data comparison
Magnesium alloy sample prepared by embodiment 1 and comparative example 1 is placed in distilled water respectively and carries out Dynamic Corrosion,
0min, 2.5min, 5min, 10min, 15min are stirred under conditions of 1000r/min respectively.Measure 15 ° of surface slide angle and inclination
When gliding cable structure variation, it is found that B's based in superslide surface prepared by micron scale construction and embodiment 1 in comparative example 1
A's is compared based on superslide surface prepared by micro-nano compound structure, when 0min slide angle and gliding cable structure almost with A indifference
Not；After 2.5min, the gliding cable structure of B is obviously reduced, and slide angle increases；After 5min, water droplet smooth can not slip over surface, slide angle
Greater than 20 °；After 10min, water droplet is stagnated in surface, and slide angle is greater than 30 °；After 15min, slide angle is greater than 45 °.And A is in 10min
Gliding cable structure and slide angle are almost without change afterwards, and slide angle is slightly decreased after 15min.It demonstrates made based on micro-nano compound structure
Standby superslide surface out is more more advantageous (Fig. 2) than based on superslide surface stability prepared by micron scale construction.
Claims (7)
1. a kind of method for preparing corrosion stability of magnesium alloy film layer using superslide surface, which comprises the following steps:
Step 1 will be placed in the electrolyte of silicate systems by pretreated magnesium alloy, and magnesium alloy is as anode, stainless steel
Plate carries out MAO micro-arc oxidation treatment as cathode, and each component content of the electrolyte of the silicate systems is respectively as follows: sodium metasilicate 8
~10g/L, 2~5g/L of sodium hydroxide, 0.5~2g/L of sodium fluoride.；
Step 2 immerses the magnesium alloy differential arc oxidation sample that step 1 processing obtains in the nine water aluminum nitrate solutions that pH value is 12.5
The processing of LDH layered double-hydroxide is carried out under high temperature；
Step 3, the sample progress that step 2 is obtained with low-surface energy substance 1H, 1H, 2H, 2H- perfluoro capryl triethoxysilane
Modification, forms super-hydrophobic film layer.
Excessive perfluoropolyether is added dropwise to above-mentioned surface by step 4, and sample tilts 30 °, places 2 hours, finally obtains stable surpass
Sliding surface.
2. a kind of method for preparing corrosion stability of magnesium alloy film layer using superslide surface according to claim 1, feature exist
In the preprocessing process of magnesium alloy described in step 1 are as follows: magnesium alloy is successively used to the SiC sand of 400#, 800#, 1000#, 1200#
Paper polishes to surface and edge, respectively with dry after 10~15min of dehydrated alcohol and deionized water ultrasonic cleaning.
3. a kind of method for preparing corrosion stability of magnesium alloy film layer using superslide surface according to claim 1, feature exist
In differential arc oxidation parameter described in step 1 are as follows: 5~10A/dm of current density2, 400~500Hz of frequency, duty ratio 20~
30%, 5~10min of differential arc oxidation time.
4. a kind of method for preparing corrosion stability of magnesium alloy film layer using superslide surface according to claim 1, feature exist
In nine water aluminum nitrate solution concentration described in step 2 are 0.01~0.02mol/L, and pH value is adjusted to 12.5 using NaOH.
5. a kind of method for preparing corrosion stability of magnesium alloy film layer using superslide surface according to claim 1, feature exist
In LDH treatment conditions described in step 2 are as follows: temperature 60 C~120 DEG C, 3~12h of time.
6. a kind of method for preparing corrosion stability of magnesium alloy film layer using superslide surface according to claim 1, feature exist
In, 1H described in step 3,1H, 2H, the concentration of 2H- perfluoro capryl triethoxysilane are as follows: distilled water: ethyl alcohol: 1H, 1H,
The volume ratio of 2H, 2H- perfluoro capryl triethoxysilane is 100:200:1.
7. a kind of method for preparing corrosion stability of magnesium alloy film layer using superslide surface according to claim 1, feature exist
In modification mode described in step 3: impregnating 2h at room temperature.
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