CN109825866A - A kind of preparation method of the anti-corrosion differential arc oxidation coating of alloy selfreparing - Google Patents
A kind of preparation method of the anti-corrosion differential arc oxidation coating of alloy selfreparing Download PDFInfo
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Abstract
The invention belongs to metal material surface chemical treatment method field, in particular to a kind of preparation method of the anti-corrosion differential arc oxidation coating of alloy selfreparing.One layer of differential arc oxidation coating is formed in silicate electrolyte using pulse current in metal surface first, and sealing of hole post-processing is then carried out in the phosphating solution containing corrosion inhibiter.During the preparation of differential arc oxidation in-situ TEM, the composition of electrolyte are as follows: 10~80g/L of sodium metasilicate, 1~10g/L of potassium fluoride, 0.5~8g/L of sodium hydroxide, 10~80mL/L of ethylene glycol, water surplus.Post-treatment solution composition are as follows: 20~60g/L of dihydric phosphate, 1~8g/L of sodium nitrate, 10~50g/L of corrosion inhibiter, 20~60g/L of sulfate, tetra- 1~8g/L of sodium of EDTA, water surplus.The present invention can solve current differential arc oxidation voidage height, corrosive medium easily invades matrix, so as to cause the disadvantage of corrosion resistance difference.
Description
Technical field
The invention belongs to metal material surface chemical treatment method field, in particular to a kind of anti-corrosion differential of the arc of alloy selfreparing
The preparation method of oxide covering.
Background technique
With the development of the social economy, effect of the metal and alloy materials in production and living is more and more important, but metal
Material is exposed to air and chemistry and electrochemical corrosion easily occurs.Material corrosion, especially metal erosion are that the whole world is urgently to be resolved
A serious problems.Corrosion not only consumes mankind's wealth, the also serious normal operation for hindering production and living, or even threatens people
The safety and health of class.Data shows, the whole world every year because caused by metal erosion direct economic loss be it up to 700,000,000,000 dollars
His natural calamity causes damages 6 times of summation, China because caused by corrosion economic loss reach the 4% of gross national product.
Metal erosion in order to prevent, various etch-proof means are come into being, and wherein the application of metal coating anti-corrosion is the widest
It is general.Corrosion-inhibiting coating technology is exactly to cover the good coating of one layer of corrosion resistance in metal material surface, makes metallic matrix and corrosive environment
Keep apart, to delay the corrosion rate of metal itself.In herein, differential arc oxidation coating is because its quality is stablized, corrosion-proof wear
The features such as property is superior, and binding force is strong, has wide range of applications, is metal erosion guard technology one extremely good selection.For
For differential arc oxidation coating, a large amount of cavities existing for coat inside become what limitation differential arc oxidation coating corrosion resistance further increased
Maximum hinders.Therefore, it is desirable to further increase the corrosion resistance of differential arc oxidation coating, must just be blocked by way of post-processing micro-
The hole of arc oxide covering.
The features such as phosphating solution is low in cost because its is nontoxic, easy to operate makes it in metallochemistry conversion film field one
Directly by attention.Especially because phosphating coat is well combined with paint, and improves corrosion resistance etc. to a certain extent, lead to it extensively
Ground is used as in every field such as metallic paint prime coat, antirust phosphating layer, wear resistant friction reducing phosphate coatings.
Summary of the invention
For overcome the deficiencies in the prior art, the purpose of the present invention is to provide a kind of anti-corrosion differential arc oxidations of alloy selfreparing
The preparation method of coating is post-processed by phosphating solution containing corrosion inhibiter and promotes differential arc oxidation coating performance, can solve the current differential of the arc
Oxidation voidage is high, corrosive medium easily invades matrix, so as to cause the disadvantage of corrosion resistance difference.
Above-mentioned purpose of the invention is achieved through the following technical solutions:
A kind of preparation method of the anti-corrosion differential arc oxidation coating of alloy selfreparing, includes the following steps:
Step 1, the preparation of micro-arc oxidation electrolyte: by 10~80g/L of sodium metasilicate, 1~10g/L of potassium fluoride, sodium hydroxide
0.5~8g/L, 10~80mL/L of ethylene glycol are sufficiently mixed and are dissolved in deionized water, and stir evenly；
Step 2, it pre-processes: metallic matrix is bright and clean with sand paper polishing, the oil removing of acetone ultrasound is then used, alcohol washes are gone
Ionized water is dry after rinsing；
Step 3, the pretreated metallic matrix of step 2 preparation of differential arc oxidation coating: is prepared to obtained electricity in step 1
It solves in liquid, carries out differential arc oxidation coating and be prepared in situ, micro-arc oxidation process selects constant pressure or constant current mode, the work of differential arc oxidation
Skill parameter is as follows: output voltage is 200~600V under constant voltage mode, and constant current mode current density is 1~10A/dm2, pulse accounts for
Empty ratio 10%~70%, 50~5000Hz of pulse frequency handle 10~60min of time；
Step 4, the preparation of post-treatment solution: first by 20~60g/L of dihydric phosphate, 1~8g/L of sodium nitrate, corrosion inhibiter 10
~50g/L, which is sufficiently mixed, to be dissolved in deionized water, and is stirred evenly；Again by 20~60g/L of sulfate, tetra- 1~8g/ of sodium of EDTA
L is sufficiently mixed dissolution, and stirs evenly；Finally, both the above solution is mixed and stirred for uniformly；
Step 5, the metallic matrix with differential arc oxidation coating will be made in step 3, is submerged initially in the post-processing of step 4 preparation
10~120min is handled in solution, 40~80 DEG C of temperature, is then taken out and is embathed in distilled water, 24~72h of aging under room temperature.
The preparation method of the anti-corrosion differential arc oxidation coating of alloy selfreparing, in step 1, it is preferred that sodium metasilicate, fluorination
Potassium, sodium hydroxide, ethylene glycol and deionized water mass ratio be 30~40:3~4:2~3:30~40:1000.
The preparation method of the anti-corrosion differential arc oxidation coating of alloy selfreparing, in step 1, sodium metasilicate using sodium phosphate or
Sodium tripolyphosphate substitution.
The preparation method of the anti-corrosion differential arc oxidation coating of alloy selfreparing, in step 2, sand paper polishing is according to 240
Mesh, 400 mesh, 800 mesh, 1000 mesh sand paper successively polish.
The preparation method of the anti-corrosion differential arc oxidation coating of alloy selfreparing, in step 2, metallic matrix be magnesium alloy,
Aluminium alloy or titanium alloy are one such.
The preparation method of the anti-corrosion differential arc oxidation coating of alloy selfreparing in step 3, grows differential of the arc oxygen as needed
Change the spacing at big minor adjustment yin-yang the two poles of the earth of the metallic matrix of coating in 10~1000mm；Preferably, micro-arc oxidation process selects
Constant pressure or constant current mode, output voltage is 300~480V under constant voltage mode, and constant current mode current density is 1~2A/dm2, arteries and veins
100~500Hz of frequency is rushed, pulse duty factor is 25~35%.
The preparation method of the anti-corrosion differential arc oxidation coating of alloy selfreparing, in step 4, dihydric phosphate is di(2-ethylhexyl)phosphate
Hydrogen ammonium, sodium dihydrogen phosphate or potassium dihydrogen phosphate are one such, and sulfate is manganese sulfate or zinc sulfate, and corrosion inhibiter is dodecyl
Sodium sulphate, dodecyl sodium sulfate, neopelex, fumaric acid sodium, 8-hydroxy-quinoline or 3,5 dinitrosalicylic acid sodium
It is one such.
The preparation method of the anti-corrosion differential arc oxidation coating of alloy selfreparing, in step 4, the pH value of post-treatment solution exists
3~6.
Design philosophy of the invention is:
The present invention forms one layer of differential arc oxidation coating using pulse current in metal surface first in silicate electrolyte,
Then sealing of hole post-processing is carried out in the phosphating solution containing corrosion inhibiter.Purpose is differential of the arc when immersing phosphating solution using differential arc oxidation layer
The local pH aoxidized in hole increases, and the dihydric phosphate and sulfuric acid reactant salt in phosphating solution generate one hydrogen of phosphoric acid not soluble in water
Salt crystallization, crystalline solid blocks differential arc oxidation coating hole, and corrosion inhibiter is enclosed inside differential arc oxidation hole, reduces differential arc oxidation
The porosity of coating prevents corrosive media from entering inside film layer by hole and connects with metallic matrix in metal use process
Touching, to achieve the purpose that promote membranous layer corrosion resistance energy.
The invention has the advantages and beneficial effects that:
1) phosphating solution of the present invention is simple to differential arc oxidation coating progress post-processing operation, low in cost, durable reliable；
2) phosphate of the present invention crystallizes above differential arc oxidation layer, effectively increases coating layer thickness；
3) corrosion inhibiter can be carried on differential arc oxidation coating by the present invention, and alloy corrosion rate is effectively reduced；
4) present invention can promote differential arc oxidation coating performance, differential arc oxidation coating table through the post-processing of phosphating solution containing corrosion inhibiter
Face porosity can effectively prevent corrosive medium to enter, and can effectively promote the corrosion resistance of matrix.
Detailed description of the invention
Fig. 1 is to post-process front surface macro morphology photo by phosphating solution.
Fig. 2 is to post-process rear surface macro morphology photo by phosphating solution.
Fig. 3 be will after 25 days neutral salt spray tests macrocorrosion pattern.
Specific embodiment
In the specific implementation process, it is provided by the present invention it is a kind of based on phosphating solution containing corrosion inhibiter to the envelope of differential arc oxidation coating
Hole technology can be realized by following committed step:
(1) it is grown according to the ingredient Specific disposition differential arc oxidation of the magnesium alloy type of growth oxide layer and required oxide layer
Electrolyte；
(2) as needed the spacing at big minor adjustment yin-yang the two poles of the earth of the metallic matrix workpiece of growth oxide layer 10~
1000mm；
(3) micro-arc oxidation process selection constant pressure or constant current mode, constant current mode current density are 1~10A/dm2, constant pressure
Output voltage is 200~600V under mode, and regulation pulse frequency is 50~5000Hz, and pulse duty factor is 10%~70%, micro-
Arc oxide covering with a thickness of 10~50 μm；
(4) according to the ingredient Specific disposition phosphating solution of required reconditioning layer, pH value will have micro-arc oxidation films 3~6
Metal, which impregnates, prepares film layer by deposition reaction in the solution, and temperature when preparation is 40~80 DEG C, preparation time for 10min~
60min, the porosity of micro-arc oxidation films are 10%~40%.
Provided technique according to the present invention, no matter metal anode is magnesium alloy, titanium alloy, aluminium alloy, can be in its table
Face successfully prepares film layer.The major parameter that differential arc oxidation need to regulate and control are as follows: the concentration and micro-arc oxidation process of each ingredient in electrolyte
In electrical parameter.Post-process the major parameter that need to regulate and control are as follows: temperature and preparation in solution in the concentration preparation process of each ingredient
Time.
To keep the purpose of the present invention, method scheme and advantage more clear, this is specifically described with reference to the accompanying drawing
The preferred embodiment of invention, the present invention is described in more detail.Wherein, attached drawing constitute the application a part, and with the present invention
Embodiment be used to illustrate the principle of the present invention together.
Embodiment 1
In the present embodiment, calcium salt and corrosion inhibiter by differential arc oxidation and are being contained using electrolyte in AZ91D Mg alloy surface
Acid solution in deposit and be made, implement according to the following steps:
Step 1: configuration differential arc oxidation grows electrolyte composition are as follows: sodium metasilicate 20g/L, potassium fluoride 4g/L, alkali metal hydrogen-oxygen
Change sodium 3g/L, ethylene glycol 20mL/L, deionized water surplus；
Step 2: it will need to grow the metallic matrix of oxidation film as anode, graphite plate adjusts yin-yang the two poles of the earth as cathode
Spacing be 200mm；Metallic matrix is bright and clean with sand paper polishing, and sand paper polishing is according to 240 mesh, 400 mesh, 800 mesh, 1000 mesh
Sand paper successively polish；It is dry after then using the oil removing of acetone ultrasound, alcohol washes, deionized water to rinse；
Step 3: selection constant current mode, current density 2A/dm2, regulation pulse frequency is 300Hz, and pulse duty factor is
30%, handle time 30min, differential arc oxidation coating with a thickness of 30 μm；
Step 4: configuration phosphating solution ingredient are as follows: ammonium dihydrogen phosphate 30g/L, sodium nitrate 1g/L, lauryl sodium sulfate 20g/
Tetra- sodium 2g/L of L, manganese sulfate monohydrate 30g/L, EDTA, deionized water surplus.Process for preparation: first by ammonium dihydrogen phosphate, sodium nitrate, ten
Sodium dialkyl sulfate, which is sufficiently mixed, to be dissolved in deionized water, and is stirred evenly；It is again that manganese sulfate monohydrate, tetra- sodium of EDTA is sufficiently mixed
Dissolution is closed, and is stirred evenly；Finally, both the above solution is mixed and stirred for uniformly；
Step 5: the metal for having micro-arc oxidation films is impregnated in the solution by deposition reaction preparation film layer, when preparation
Temperature is 70 DEG C, preparation time 30min, then takes out and embathes in distilled water, aging 48h under room temperature, micro-arc oxidation films
Porosity is 10%.
Embodiment 2
In the present embodiment, in AM50 Mg alloy surface using electrolyte by differential arc oxidation and containing calcium salt and corrosion inhibiter
Deposition is made in acid solution, implements according to the following steps:
Step 1: configuration differential arc oxidation grows electrolyte composition are as follows: sodium metasilicate 20g/L, potassium fluoride 4g/L, alkali metal hydrogen-oxygen
Change sodium 3g/L, ethylene glycol 50mL/L, deionized water surplus；
Step 2: it will need to grow the metallic matrix of oxidation film as anode, graphite plate adjusts yin-yang the two poles of the earth as cathode
Spacing be 200mm；Metallic matrix is bright and clean with sand paper polishing, and sand paper polishing is according to 240 mesh, 400 mesh, 800 mesh, 1000 mesh
Sand paper successively polish；It is dry after then using the oil removing of acetone ultrasound, alcohol washes, deionized water to rinse；
Step 3: selection constant voltage mode, voltage 450V, regulation pulse frequency be 300Hz, pulse duty factor 30%,
Handle time 40min, differential arc oxidation coating with a thickness of 40 μm；
Step 4: configuration phosphating solution ingredient are as follows: ammonium dihydrogen phosphate 40g/L, sodium nitrate 2g/L, dodecyl sodium sulfate 15g/
Tetra- sodium 2g/L of L, manganese sulfate monohydrate 40g/L, EDTA, deionized water surplus.Process for preparation: first by ammonium dihydrogen phosphate, sodium nitrate, ten
Dialkyl sulfonates, which are sufficiently mixed, to be dissolved in deionized water, and is stirred evenly；It is again that manganese sulfate monohydrate, tetra- sodium of EDTA is sufficiently mixed
Dissolution is closed, and is stirred evenly；Finally, both the above solution is mixed and stirred for uniformly；
Step 5: the metal for having micro-arc oxidation films is impregnated in the solution by deposition reaction preparation film layer, when preparation
Temperature be 80 DEG C, preparation time 60min, then take out embathed in distilled water, under room temperature aging for 24 hours, micro-arc oxidation films
Porosity is 12%.
Embodiment 3
In the present embodiment, in ZK60 Mg alloy surface using electrolyte by differential arc oxidation and containing calcium salt and corrosion inhibiter
Deposition is made in acid solution, implements according to the following steps:
Step 1: configuration differential arc oxidation grows electrolyte composition are as follows: sodium metasilicate 30g/L, potassium fluoride 4g/L, alkali metal hydrogen-oxygen
Change sodium 2g/L, ethylene glycol 30mL/L, deionized water surplus；
Step 2: it will need to grow the metallic matrix of oxidation film as anode, graphite plate adjusts yin-yang the two poles of the earth as cathode
Spacing be 200mm；Metallic matrix is bright and clean with sand paper polishing, and sand paper polishing is according to 240 mesh, 400 mesh, 800 mesh, 1000 mesh
Sand paper successively polish；It is dry after then using the oil removing of acetone ultrasound, alcohol washes, deionized water to rinse；
Step 3: selection constant current mode, current density 1A/dm2, regulation pulse frequency is 500Hz, and pulse duty factor is
30%, handle time 60min, differential arc oxidation coating with a thickness of 35 μm；
Step 4: configuration phosphating solution ingredient are as follows: ammonium dihydrogen phosphate 30g/L, sodium nitrate 1g/L, neopelex
Tetra- sodium 2g/L of 30g/L, manganese sulfate monohydrate 30g/L, EDTA, deionized water surplus.Process for preparation: first by ammonium dihydrogen phosphate, nitric acid
Sodium, neopelex, which are sufficiently mixed, to be dissolved in deionized water, and is stirred evenly；Again by manganese sulfate monohydrate, EDTA tetra-
Sodium is sufficiently mixed dissolution, and stirs evenly；Finally, both the above solution is mixed and stirred for uniformly；
Step 5: the metal for having micro-arc oxidation films is impregnated in the solution by deposition reaction preparation film layer, when preparation
Temperature is 70 DEG C, preparation time 30min, then takes out and embathes in distilled water, aging 36h under room temperature, micro-arc oxidation films
Porosity is 20%.
Embodiment 4
In the present embodiment, calcium salt and corrosion inhibiter by differential arc oxidation and are being contained using electrolyte in AZ91D Mg alloy surface
Acid solution in deposit and be made, implement according to the following steps:
Step 1: configuration differential arc oxidation grows electrolyte composition are as follows: sodium metasilicate 60g/L, potassium fluoride 4g/L, alkali metal hydrogen-oxygen
Change sodium 2g/L, ethylene glycol 40mL/L, deionized water surplus；
Step 2: it will need to grow the metallic matrix of oxidation film as anode, graphite plate adjusts yin-yang the two poles of the earth as cathode
Spacing be 200mm；Metallic matrix is bright and clean with sand paper polishing, and sand paper polishing is according to 240 mesh, 400 mesh, 800 mesh, 1000 mesh
Sand paper successively polish；It is dry after then using the oil removing of acetone ultrasound, alcohol washes, deionized water to rinse；
Step 3: selection constant current mode, current density 2A/dm2, regulation pulse frequency is 500Hz, and pulse duty factor is
30%, handle time 50min, differential arc oxidation coating with a thickness of 50 μm；
Step 4: configuration phosphating solution ingredient are as follows: ammonium dihydrogen phosphate 30g/L, sodium nitrate 1g/L, fumaric acid sodium 40g/L, a water
Tetra- sodium 2g/L of manganese sulfate 30g/L, EDTA, deionized water surplus.Process for preparation: first by ammonium dihydrogen phosphate, sodium nitrate, fumaric acid sodium
It is sufficiently mixed and is dissolved in deionized water, and stir evenly；Manganese sulfate monohydrate, tetra- sodium of EDTA are sufficiently mixed dissolution, and stirred again
It mixes uniformly；Finally, both the above solution is mixed and stirred for uniformly；
Step 5: the metal for having micro-arc oxidation films is impregnated in the solution by deposition reaction preparation film layer, when preparation
Temperature is 60 DEG C, preparation time 30min, then takes out and embathes in distilled water, aging 72h under room temperature, micro-arc oxidation films
Porosity is 15%.
As Figure 1-Figure 2, post-processing preceding and processing rear surface macro morphology photo comparison from phosphating solution can be seen that phosphorus
Specimen surface roughness after changing liquid post-processing increases, and uniformly grows one layer of phosphating coat, have phosphate crystal crystallization in
Differential arc oxidation coating surface.
As shown in figure 3, including the oxide layer for being grown on magnesium alloy substrate surface and the phosphate for being deposited on oxidation layer surface
Layer.Wherein, the oxide layer is made by differential arc oxidation in metal surface using electrolyte, and the phosphate layer uses phosphating solution
Oxidation layer surface is deposited on to be made.It can be seen that surface from the macrocorrosion pattern after 25 days neutral salt spray tests not send out
Existing apparent corrosion occurs, and illustrates composite coating corrosion resistance excellent after phosphating solution post-processing.
Embodiment 5
In the present embodiment, in 3003 aluminum alloy surfaces using electrolyte by differential arc oxidation and containing calcium salt and corrosion inhibiter
Deposition is made in acid solution, implements according to the following steps:
Step 1: configuration differential arc oxidation grows electrolyte composition are as follows: sodium phosphate 40g/L, potassium fluoride 3g/L, alkali metal hydrogen-oxygen
Change sodium 3g/L, ethylene glycol 35mL/L, deionized water surplus；
Step 2: it will need to grow the metallic matrix of oxidation film as anode, graphite plate adjusts yin-yang the two poles of the earth as cathode
Spacing be 100mm；Metallic matrix is bright and clean with sand paper polishing, and sand paper polishing is according to 240 mesh, 400 mesh, 800 mesh, 1000 mesh
Sand paper successively polish；It is dry after then using the oil removing of acetone ultrasound, alcohol washes, deionized water to rinse；
Step 3: selection constant voltage mode, voltage 350V, regulation pulse frequency be 400Hz, pulse duty factor 35%,
Handle time 40min, differential arc oxidation coating with a thickness of 15 μm；
Step 4: configuration phosphating solution ingredient are as follows: sodium dihydrogen phosphate 45g/L, sodium nitrate 3g/L, 8-hydroxy-quinoline 25g/L, sulphur
Tetra- sodium 5g/L of sour zinc 35g/L, EDTA, deionized water surplus.Process for preparation: first by sodium dihydrogen phosphate, sodium nitrate, 8-hydroxy-quinoline
It is sufficiently mixed and is dissolved in deionized water, and stir evenly；Zinc sulfate, tetra- sodium of EDTA are sufficiently mixed dissolution again, and stirred equal
It is even；Finally, both the above solution is mixed and stirred for uniformly；
Step 5: the metal for having micro-arc oxidation films is impregnated in the solution by deposition reaction preparation film layer, when preparation
Temperature be 50 DEG C, preparation time 60min, then take out embathed in distilled water, under room temperature aging for 24 hours, micro-arc oxidation films
Porosity is 15%.
Embodiment 6
In the present embodiment, in TC4 titanium alloy surface using electrolyte by differential arc oxidation and containing calcium salt and corrosion inhibiter
Deposition is made in acid solution, implements according to the following steps:
Step 1: configuration differential arc oxidation grows electrolyte composition are as follows: sodium tripolyphosphate 35g/L, potassium fluoride 4g/L, alkali metal
Sodium hydroxide 2g/L, ethylene glycol 30mL/L, deionized water surplus；
Step 2: it will need to grow the metallic matrix of oxidation film as anode, graphite plate adjusts yin-yang the two poles of the earth as cathode
Spacing be 50mm；Metallic matrix is bright and clean with sand paper polishing, and sand paper polishing is according to 240 mesh, 400 mesh, 800 mesh, 1000 mesh
Sand paper successively polish；It is dry after then using the oil removing of acetone ultrasound, alcohol washes, deionized water to rinse；
Step 3: selection constant current mode, current density 1.5A/dm2, regulation pulse frequency is 350Hz, pulse duty factor
Be 25%, handle time 30min, differential arc oxidation coating with a thickness of 10 μm；
Step 4: configuration phosphating solution ingredient are as follows: potassium dihydrogen phosphate 50g/L, sodium nitrate 4g/L, 3,5 dinitrosalicylic acid sodium
Tetra- sodium 3g/L of 35g/L, zinc sulfate 40g/L, EDTA, deionized water surplus.Process for preparation: first by potassium dihydrogen phosphate, sodium nitrate, 3,
5 dinitrosalicylic acid sodium, which are sufficiently mixed, to be dissolved in deionized water, and is stirred evenly；It is again that zinc sulfate, tetra- sodium of EDTA is sufficiently mixed
Dissolution is closed, and is stirred evenly；Finally, both the above solution is mixed and stirred for uniformly；
Step 5: the metal for having micro-arc oxidation films is impregnated in the solution by deposition reaction preparation film layer, when preparation
Temperature is 80 DEG C, preparation time 40min, then takes out and embathes in distilled water, aging 48h under room temperature, micro-arc oxidation films
Porosity is 10%.
Embodiment the result shows that, compared with prior art, differential arc oxidation hole sealing coating provided by the invention corrosion ring
There is preferable protective action in border, (a) comparatively dense film layer and lower porosity had both been had the advantage that as workpiece；
(b) there is stronger inhibition to the intrusion of corrosive medium；(c) thicknesses of layers and structure are uniform；(d) film layer is in conjunction with matrix
Power is strong, and the ability that external force resistance destroys is strong；(e) film layer prepare it is relatively simple, it is lower to equipment requirement, be easy to be mass produced with
And the preparation of complex part.
Claims (8)
1. a kind of preparation method of the anti-corrosion differential arc oxidation coating of alloy selfreparing, which comprises the steps of:
Step 1, the preparation of micro-arc oxidation electrolyte: by 10~80g/L of sodium metasilicate, 1~10g/L of potassium fluoride, sodium hydroxide 0.5~
8g/L, 10~80mL/L of ethylene glycol are sufficiently mixed and are dissolved in deionized water, and stir evenly；
Step 2, it pre-processes: bright and clean, subsequent acetone ultrasound oil removing that metallic matrix is polished with sand paper, alcohol washes, deionization
Water is dry after rinsing；
Step 3, the pretreated metallic matrix of step 2 preparation of differential arc oxidation coating: is prepared to obtained electrolyte in step 1
In, it carries out differential arc oxidation coating and is prepared in situ, micro-arc oxidation process selects constant pressure or constant current mode, the technique ginseng of differential arc oxidation
Number is as follows: output voltage is 200~600V under constant voltage mode, and constant current mode current density is 1~10A/dm2, pulse duty factor
10%~70%, 50~5000Hz of pulse frequency handle 10~60min of time；
Step 4, the preparation of post-treatment solution: first by 20~60g/L of dihydric phosphate, 1~8g/L of sodium nitrate, corrosion inhibiter 10~
50g/L, which is sufficiently mixed, to be dissolved in deionized water, and is stirred evenly；Again by 20~60g/L of sulfate, tetra- 1~8g/L of sodium of EDTA
It is sufficiently mixed dissolution, and is stirred evenly；Finally, both the above solution is mixed and stirred for uniformly；
Step 5, the metallic matrix with differential arc oxidation coating will be made in step 3, is submerged initially in the post-treatment solution of step 4 preparation
10~120min of middle processing, then takes out and embathes in distilled water by 40~80 DEG C of temperature, 24~72h of aging under room temperature.
2. the preparation method of the anti-corrosion differential arc oxidation coating of alloy selfreparing described in accordance with the claim 1, which is characterized in that step
In 1, it is preferred that sodium metasilicate, potassium fluoride, sodium hydroxide, ethylene glycol and deionized water mass ratio be 30~40:3~4:2~
3:30~40:1000.
3. the preparation method of the anti-corrosion differential arc oxidation coating of alloy selfreparing described in accordance with the claim 1, which is characterized in that step
In 1, sodium metasilicate is substituted using sodium phosphate or sodium tripolyphosphate.
4. the preparation method of the anti-corrosion differential arc oxidation coating of alloy selfreparing described in accordance with the claim 1, which is characterized in that step
In 2, sand paper polishing is successively to polish according to the sand paper of 240 mesh, 400 mesh, 800 mesh, 1000 mesh.
5. the preparation method of the anti-corrosion differential arc oxidation coating of alloy selfreparing described in accordance with the claim 1, which is characterized in that step
In 2, metallic matrix is that magnesium alloy, aluminium alloy or titanium alloy are one such.
6. the preparation method of the anti-corrosion differential arc oxidation coating of alloy selfreparing described in accordance with the claim 1, which is characterized in that step
In 3, the spacing at big minor adjustment yin-yang the two poles of the earth of the metallic matrix of differential arc oxidation coating is grown as needed in 10~1000mm；It is excellent
Choosing, micro-arc oxidation process selects constant pressure or constant current mode, and output voltage is 300~480V, constant current mode under constant voltage mode
Current density is 1~2A/dm2, 100~500Hz of pulse frequency, pulse duty factor is 25~35%.
7. the preparation method of the anti-corrosion differential arc oxidation coating of alloy selfreparing described in accordance with the claim 1, which is characterized in that step
In 4, dihydric phosphate be ammonium dihydrogen phosphate, sodium dihydrogen phosphate or potassium dihydrogen phosphate it is one such, sulfate be manganese sulfate or
Zinc sulfate, corrosion inhibiter are lauryl sodium sulfate, dodecyl sodium sulfate, neopelex, fumaric acid sodium, eight hydroxyls
Quinoline or 3,5 dinitrosalicylic acid sodium are one such.
8. the preparation method of the anti-corrosion differential arc oxidation coating of alloy selfreparing described in accordance with the claim 1, which is characterized in that step
In 4, the pH value of post-treatment solution is 3~6.
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| CN110424039A (en) * | 2019-09-16 | 2019-11-08 | 东北大学 | The preparation method of the anti-corrosion selfreparing differential arc oxidation coating of magnesium alloy based on hydrotalcite nano inhibition microcapsules |
| CN111172526A (en) * | 2020-02-20 | 2020-05-19 | 兰州理工大学 | Method for in-situ ceramic coating on surface of low-pressure cold-sprayed Al-based coating |
| CN112457696A (en) * | 2020-10-28 | 2021-03-09 | 桂林理工大学 | Self-repairing coating based on quinoline nano metal-organic framework material and preparation method thereof |
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