CN101748464A - Electrolyte and zirconium or zirconium alloy surface micro-arc oxidation method - Google Patents

Electrolyte and zirconium or zirconium alloy surface micro-arc oxidation method Download PDF

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CN101748464A
CN101748464A CN200810241636A CN200810241636A CN101748464A CN 101748464 A CN101748464 A CN 101748464A CN 200810241636 A CN200810241636 A CN 200810241636A CN 200810241636 A CN200810241636 A CN 200810241636A CN 101748464 A CN101748464 A CN 101748464A
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zirconium
electrolytic solution
arc oxidation
zirconium alloy
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CN101748464B (en
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王磊
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BYD Co Ltd
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Abstract

The invention provides electrolyte. The electrolyte is aqueous solution; and the aqueous solution contains fluorozirconate, borofluoride, water-soluble carboxylate of zinc and alkali metal hydroxide. The invention also provides a zirconium or zirconium alloy surface micro-arc oxidation method, wherein the electrolyte adopted by the micro-arc oxidation is the electrolyte provided by the invention. Through the method of the invention, a micro-arc oxidation film is formed on the surface of zirconium or zirconium alloy so as to greatly improve the corrosion resistance of the zirconium or zirconium alloy. In addition, the method of the invention also can further improve stain resistance, compactness, hardness, abrasion resistance and electrical insulating property of the zirconium or zirconium alloy surface.

Description

A kind of electrolytic solution and zirconium or zirconium alloy surface micro-arc oxidation method
[technical field]
The present invention relates to a kind of electrolytic solution, also relate to a kind of method of using this electrolytic solution zirconium and zirconium alloy surface to be carried out differential arc oxidation.
[background technology]
The content of zirconium in the earth's crust is quite big, and is all bigger than general metallic zinc commonly used, copper, tin etc., is light grey.Be that matrix adds other element and can constitute zirconium alloy with the zirconium, described other element for example can be tin, niobium, iron etc.Zirconium alloy has that mechanical property is moderate, the atonic heat capacity neutron-absorption cross-section is lower, plasticity-is strong and excellent properties such as obdurability and good biocompatibility, makes it in fields such as nuclear reactor, plastic working, welding purposes very widely be arranged.But zirconium and zirconium alloy erosion resistance at normal temperatures are relatively poor, have limited its application greatly.
For improving the corrosion resistance nature of zirconium and zirconium alloy, be well known that at present by zirconium or zirconium alloy are carried out the method that differential arc oxidation forms oxide film in electrolytic solution.Differential arc oxidation (micro-arc oxidation, note by abridging be MAO), it is a kind of method that forms ceramic membrane in the material surface original position.This method is by effect of electric field in the electrolytic solution, and the micro-arc discharge on non-ferrous metal or alloy electrode surface produces complicated plasma chemical, thermochemistry and electrochemical reaction, and forms fine and close ceramic coating.
Disclose a kind of magnesium matrix microarc oxidation electrolyte and differential arc oxidation method thereof in the prior art, described electrolytic solution comprises: fluozirconate 3~40g/L, oxalic acid 0.5~10g/L, phosphoric acid 2~20g/L, acetate 1~20g/L, phosphoric acid salt 3~30g/L, fluoride salt 0.5~10g/L.Do not contain chromium cpd in this electrolytic solution, environment there is not too big pollution, but when adopting this electrolytic solution that zirconium and zirconium alloy are carried out differential arc oxidation, almost can not film forming or the surface form one deck very thin and with the film of zirconium or the non-constant of zirconium alloy sticking power, wiping just comes off gently; Though perhaps the film of Xing Chenging reaches requirement with zirconium or zirconium alloy sticking power, the erosion resistance of film own is relatively poor, makes that zirconium and zirconium alloy surface erosion resistance is still very poor.
[summary of the invention]
The objective of the invention is in order to overcome the shortcoming of the corrosion-resistant of zirconium and zirconium alloy in the prior art, the surface micro-arc oxidation method that a kind of electrolytic solution is provided and can improves the erosion resistance of zirconium and zirconium alloy.
The invention provides a kind of electrolytic solution, described electrolytic solution is the aqueous solution, contains water-soluble carboxylate, the alkali metal hydroxide of fluozirconate, fluoroborate, zinc in the described aqueous solution.
The present invention also provides a kind of zirconium or zirconium alloy surface micro-arc oxidation method, this method comprises zirconium or zirconium alloy is placed the electrolyzer that fills electrolytic solution, with zirconium or zirconium alloy is anode, with the stainless steel plate is negative electrode, under the condition of differential arc oxidation, make zirconium or zirconium alloy surface form micro-arc oxidation films, wherein, described electrolytic solution is electrolytic solution provided by the present invention.
By method of the present invention, have the grey micro-arc oxidation films in the formation of the surface of zirconium or zirconium alloy, thereby can increase substantially the erosion resistance of zirconium or zirconium alloy.
[embodiment]
The invention provides a kind of electrolytic solution, described electrolytic solution is the aqueous solution, and the described aqueous solution contains water-soluble carboxylate, the alkali metal hydroxide of fluozirconate, fluoroborate, zinc.
Wherein, the content of described fluozirconate is 2~10g/L, is preferably 4~8g/L; The content of fluoroborate is 1~12g/L, is preferably 4~8g/L; The content of the water-soluble carboxylate of zinc is 1~8g/L, is preferably 4~6g/L; The content of alkali metal hydroxide is 1~10g/L, is preferably 4~8g/L.
In the electrolytic solution provided by the present invention, the water-soluble carboxylate of described fluozirconate, fluoroborate, zinc and alkali metal hydroxide are main membrane-forming agent, are the main components that forms micro-arc oxidation films.Stronger in order to make through the corrosion resistance nature on zirconium behind the differential arc oxidation and zirconium alloy surface, in the electrolytic solution provided by the present invention, described fluozirconate is potassium fluozirconate and/or sodium fluozirconate; Described fluoroborate is potassium fluoborate and/or Sodium tetrafluoroborate; The water-soluble carboxylate of described zinc is the water-soluble carboxylate of various zinc known in those skilled in the art, and preferred carbon atom quantity is the water-soluble carboxylate of 2~12 zinc, more preferably zinc acetate and/or zinc propionate; Described alkali metal hydroxide is sodium hydroxide and/or potassium hydroxide.
Under the preferable case, the pH value of described electrolytic solution is 8.0~12.0.
The present invention also provides a kind of zirconium or zirconium alloy surface micro-arc oxidation method, comprise zirconium or zirconium alloy are placed the electrolyzer that fills electrolytic solution, with zirconium or zirconium alloy is anode, with the stainless steel plate is negative electrode, under the condition of differential arc oxidation, make zirconium or zirconium alloy surface form micro-arc oxidation films, wherein, described electrolytic solution is electrolytic solution provided by the present invention.
According to method provided by the present invention, the condition of wherein said differential arc oxidation is conventionally known to one of skill in the art, and for example the condition of described differential arc oxidation comprises that current density is 0.5~10A/dm 2, be preferably 2~4A/dm 2The temperature of electrolytic solution is 15~60 ℃, is preferably 20~30 ℃; Voltage is 280~600V, is preferably 380~580V; The time of differential arc oxidation is 5~30 minutes, is preferably 6~10 minutes.
Method of the present invention all is suitable for zirconium and various zirconium alloy, is particularly useful for following preferred zirconium alloy.Total amount with described zirconium alloy is a benchmark, and described zirconium alloy preferably contains the zirconium of 45~60 weight %, the titanium of 10~25 weight %, the copper of 5~15 weight %, the nickel of 5~15 weight %, the beryllium of 10~25 weight %.
According to method provided by the present invention, this method also comprises carries out before the differential arc oxidation step that described zirconium or zirconium alloy are carried out pre-treatment.The step of described pre-treatment is as well known to those skilled in the art, for example degreasing.
The method of described degreasing is for well known to a person skilled in the art the whole bag of tricks, for example comprises zirconium or Zirconium alloy material were soaked in the skim soln 5~10 minutes.The various degreasing fluids that described degreasing fluid is used always for those skilled in the art for example can be for containing sodium hydroxide 20~50 grams per liters, the solution of sodium phosphate 30~50 grams per liters, water glass 10~30 grams per liters, and the temperature of skim soln is 60~85 ℃.
After zirconium or zirconium alloy surface forms micro-arc oxidation films, also comprise the step of described zirconium or zirconium alloy being carried out sealing of hole.Described sealing of hole is for the micropore on the micro-arc oxidation films of zirconium or the formation of zirconium alloy surface is sealed, and is dry then.The method of sealing of hole can adopt the whole bag of tricks known in those skilled in the art, for example methods such as water seal method, nickel envelope, organosilicon sealing of hole.The present invention preferably adopts the water seal method, and this method comprises with 70-90 ℃ pure water soaks the zirconium that is attached with micro-arc oxidation films or zirconium alloy 0.5-10 minute, then dry.The various drying meanss that described exsiccant method is used always for those skilled in the art, for example vacuum-drying, seasoning, forced air drying.Preferably adopt 10-50 ℃ wind to do among the present invention.
According to differential arc oxidation method provided by the invention, this method also is included in the washing step between each step, washing times between described each operation is not particularly limited, as long as the treatment solution on surface is fully removed clean, under the preferable case, the washing times that carries out after described degreasing is 1-3 time; Washing times after described differential arc oxidation is 1-3 time.The used water of washing step is various water of the prior art, and as municipal tap water, deionized water, distilled water, pure water or their mixture, the present invention is preferably deionized water.
After by differential arc oxidation method provided by the invention zirconium alloy being carried out differential arc oxidation, can obtain thickness on the zirconium alloy surface is the 6-40 micron, be preferably the differential arc oxidation film layer of 10-20 micron, this micro-arc oxidation films not only erosion resistance, resistance to soiling and compactness is all fine, and hardness, wear resistance, electrical insulating property are all higher, and decorative appearance is very strong.
The present invention is further illustrated below by embodiment.Raw materials usedly in the embodiment of the invention all be available commercially.
Embodiment 1
Present embodiment illustrates electrolytic solution of the present invention and zirconium and zirconium alloy surface micro-arc oxidation method.
(1) solution preparation
Electrolytic solution: preparation 100L electrolytic solution, wherein the content of potassium fluozirconate is 4g/L, and the content of potassium fluoborate is 4g/L, and the content of zinc acetate is 4g/L, and the content of sodium hydroxide is 4g/L;
Degreasing fluid: preparation 120L degreasing fluid, wherein the content of sodium hydroxide is 30g/L, the content of sodium phosphate is that the content of 40g/L, water glass is the 25g/L grams per liter.
(2) degreasing
With 10cm * 3cm * 2mm zirconium alloy sheet (hnologies company, this zirconium alloy contains the zirconium of 50 weight %, the titanium of 10 weight %, the copper of 5 weight %, the nickel of 15 weight %, the beryllium of 15 weight %, the tin of 5 weight %) be soaked in the degreasing fluid of step (1) preparation, the temperature of degreasing fluid is 70 ℃, soak time is 8 minutes, and water is rinsed well then.
(3) differential arc oxidation
To immerse in the electrolytic solution of step (1) preparation through the zirconium alloy sheet of step (2) degreasing, be anode with the zirconium alloy sheet, and stainless steel plate is a negative electrode, and the zirconium alloy sheet is carried out differential arc oxidation.Wherein, the temperature of electrolytic solution is 30 ℃, and current density is 2A/dm 2Voltage is 380-500V (in 30s voltage is raised to 380V earlier, with the speed boosted voltage of 15V/min, voltage reaches 500V behind the 8min then, keeps behind the 30s voltage being reduced to 0 rapidly).Washing oven dry then.
(4) sealing of hole
To immerse temperature through the zirconium alloy sheet of above-mentioned steps (3) differential arc oxidation be to carry out sealing of hole in 5 minutes in 95 ℃ the hot pure water, take out then and use hot blast drying.
By above-mentioned steps, obtain the zirconium alloy workpiece that the surface has the grey micro-arc oxidation films at last, be designated as A1.
Comparative Examples 1
This Comparative Examples is used for that the electrolytic solution of prior art is described and adopts this electrolytic solution zirconium alloy to be carried out the method for differential arc oxidation.
Adopt the method identical with embodiment 1 that zirconium alloy is carried out the differential arc oxidation processing, difference is: the content of electrolytic solution mesoxalic acid is 2g/L, and the content of sodium acetate is 6g/L, and the content of potassium fluozirconate is 14g/L, and the pH value of electrolytic solution is 5.0;
By above-mentioned steps, obtain the zirconium alloy workpiece that the surface has the grey micro-arc oxidation films at last, be designated as D1.
Comparative Examples 2
Adopt the method preparation electrolytic solution identical with embodiment 1 and zirconium alloy is carried out the differential arc oxidation processing, difference is: do not contain sodium hydroxide in the electrolytic solution, other is identical with embodiment 1.
By above-mentioned steps, obtain the zirconium alloy workpiece that the surface has the grey micro-arc oxidation films at last, be designated as D2.
Comparative Examples 3
Adopt the method preparation electrolytic solution identical with embodiment 1 and zirconium alloy is carried out the differential arc oxidation processing, difference is: do not contain potassium fluoborate in the electrolytic solution, other is identical with embodiment 1.
By above-mentioned steps, obtain the zirconium alloy workpiece that the surface has the grey micro-arc oxidation films at last, be designated as D3.
Embodiment 2
Adopt the method preparation electrolytic solution identical and zirconium alloy is carried out the differential arc oxidation processing with embodiment 1, difference is: the content of potassium fluozirconate is 8g/L in the electrolytic solution, the content of potassium fluoborate is 8g/L, and the content of zinc acetate is 6g/L, and the content of sodium hydroxide is 8g/L.
By above-mentioned steps, obtain the zirconium alloy workpiece that the surface has the grey micro-arc oxidation films at last, be designated as A2.
Embodiment 3
Adopt the method preparation electrolytic solution identical and zirconium alloy is carried out the differential arc oxidation processing with embodiment 1, difference is: the content of potassium fluozirconate is 9g/L in the electrolytic solution, the content of potassium fluoborate is 10g/L, and the content of zinc acetate is 7g/L, and the content of sodium hydroxide is 9g/L.
By above-mentioned steps, obtain the zirconium alloy workpiece that the surface has the grey micro-arc oxidation films at last, be designated as A3.
Embodiment 4
Adopt the method preparation electrolytic solution identical and zirconium alloy is carried out the differential arc oxidation processing with embodiment 1, difference is: the content of potassium fluozirconate is 3g/L in the electrolytic solution, the content of potassium fluoborate is 2g/L, and the content of zinc propionate is 3g/L, and the content of sodium hydroxide is 3g/L.
By above-mentioned steps, obtain the zirconium alloy workpiece that the surface has the grey micro-arc oxidation films at last, be designated as A4.
Embodiment 5
Adopt the method preparation electrolytic solution identical and zirconium alloy is carried out the differential arc oxidation processing with embodiment 1, difference is: the content of potassium fluozirconate is 12g/L in the electrolytic solution, the content of potassium fluoborate is 15g/L, and the content of zinc propionate is 10g/L, and the content of sodium hydroxide is 12g/L.
By above-mentioned steps, obtain the zirconium alloy workpiece that the surface has the grey micro-arc oxidation films at last, be designated as A5.
Embodiment 6
Adopt the method identical with embodiment 1 to prepare electrolytic solution, difference is: the condition of differential arc oxidation is: the temperature of electrolytic solution is 15 ℃, and current density is 0.5A/dm 2, voltage is 280-480V (in 30s voltage is raised to 280V earlier, with the speed boosted voltage of 8V/min, voltage reaches 480V behind the 25min then, keeps behind the 30s voltage being reduced to 0 rapidly).
By above-mentioned steps, obtain the zirconium alloy workpiece that the surface has the grey micro-arc oxidation films at last, be designated as A6.
Embodiment 7
Adopt the method identical with embodiment 1 to prepare electrolytic solution, difference is: the condition of differential arc oxidation is: the temperature of electrolytic solution is 60 ℃, and current density is 10A/dm 2, voltage is 440-600V (in 30s voltage is raised to 440V earlier, with the speed boosted voltage of 40V/min, voltage reaches 600V behind the 4min then, keeps behind the 30s voltage being reduced to 0 rapidly).
By above-mentioned steps, obtain the zirconium alloy workpiece that the surface has the grey micro-arc oxidation films at last, be designated as A7.
Embodiment 8
Adopt the method preparation electrolytic solution identical with embodiment 1 and carry out differential arc oxidation and handle, difference is: adopt the zirconium alloy sheet among metal zirconium (the emerging metal in Shenzhen Science and Technology Ltd.) the replacement embodiment 1 of 12cm * 4cm * 2mm.
By above-mentioned steps, obtain the metal zirconium workpiece that the surface has the grey micro-arc oxidation films at last, be designated as A8.
Embodiment 9
The zirconium alloy workpiece A1 that embodiment 1 is made carries out following performance test, and test result is as shown in table 1.
(1) resistance to soiling test
After picking test solvent Virahol, artificial perspiration, gasoline with cotton respectively, zirconium alloy workpiece A1 surface friction 2 minutes, zirconium alloy workpiece A1 should not have on the surface variable color, nothing comes off; Again that test solvent lipstick, hand lotion, foundation cream, edible oil, sterilant, sun screen is even in zirconium alloy workpiece A1 surface-coated respectively, place water flushing after 24 hours, the zirconium alloy workpiece A1 no variable color in surface, no stains are qualified.
Wherein, artificial perspiration's prescription is for containing urea 1g/L, sodium-chlor 5g/L, and lactic acid 1.14g/L, the pH value is 6.5.
(2) surfaceness test
Adopt roughmeter (Britain Taylor SURTRONIC 3+) to scan this zirconium alloy workpiece A1, the arithmetical av of the roughness on record zirconium alloy workpiece A1 surface abbreviates the Ra value as.
(3) the wear-resisting test of RCA paper tape
Use the RCA paper tape wear resistant instrument of model as F350008, the differential arc oxidation film layer on this zirconium alloy workpiece of friction A1 surface under 175 gram forces, until the micro-arc oxidation films that grinds off the zirconium alloy surface, when exposing zirconium alloy workpiece material surface, the number of turns that the record rubber wheel rotates;
(4) oxide thickness is measured
Use the eddy current thickness meter of model, oxide film is carried out film thickness measuring as TT230.Respectively in the middle of the sample and measure five points all around, and get the thickness of its mean value as rete.
(5) pencil hardness test (ASTMD 3363-74)
Adopt pencil hardness meter F130027, the pencil hardness on the method test zirconium alloy workpiece A1 surface that is provided according to ASTM D3363, wherein load: 750 grams, pencil: the UNI of Mitsubishi.
(6) neutral salt spray corrosion test
Zirconium alloy workpiece A1 is placed salt-mist corrosion tester (the positive laboratory apparatus in source, Shanghai company limited, FQY050) in, at 35 ℃ is that the sodium chloride aqueous solution of 5 ± 0.5 weight % was sprayed 8 hours continuously on zirconium alloy workpiece A1 surface with concentration down, take out then and observe, and the corroded area on the record A1 surface percentage composition that accounts for the rete total area is measured the corrosion resistance nature of A1.
(7) electrical insulating property
Getting distance on zirconium alloy workpiece A1 surface is 2 points of 1 cm long, measures its resistance with TH2512 type Estimate of Resistance for DC Low Resistance tester, measures and gets its mean value three times, is designated as the zirconium alloy surface resistivity.During zirconium alloy surface resistivity>1000000 ohm/cm, zirconium alloy surface electrical insulativity is qualified.
Embodiment 10-16
According to the method for embodiment 9 embodiment 2-8 is handled the zirconium alloy workpiece or the metal zirconium workpiece that obtain and carry out performance test.The result is as shown in table 1.
Comparative Examples 3-4
According to the method for embodiment 9 Comparative Examples 1-2 is handled the zirconium alloy workpiece that obtains and carry out performance test, test result is as shown in table 1.
Table 1
Sample Oxide thickness (μ m) Resistance to soiling The surface roughness Ra value Wear resistance (circle) Pencil hardness (H) Erosion resistance (area %) Electrical insulating property
??A1 ??12 Qualified ??0.624 ??>500 ??>6H ??<5% Qualified
Sample Oxide thickness (μ m) Resistance to soiling The surface roughness Ra value Wear resistance (circle) Pencil hardness (H) Erosion resistance (area %) Electrical insulating property
??A2 ??16 Qualified ??0.647 ??>400 ??>6H ??<5% Qualified
??A3 ??18 Qualified ??0.716 ??>400 ??>5H ??<5% Qualified
??A4 ??8 Qualified ??0.682 ??>400 ??>4H ??<5% Qualified
??A5 ??24 Qualified ??0.832 ??>400 ??>4H ??<5% Qualified
??A6 ??36 Qualified ??0.743 ??>400 ??>6H ??<5% Qualified
??A7 ??14 Qualified ??0.689 ??>300 ??>4H ??<5% Qualified
??A8 ??18 Qualified ??0.862 ??>400 ??>6H ??<5% Qualified
??D1 ??6 Defective ??1.685 ??<50 ??<1H ??>10% Defective
??D2 ??8 Defective ??1.852 ??<50 ??<1H ??>10% Defective
??D3 ??10 Defective ??1.965 ??<100 ??<2H ??>10% Defective
From last table 1 as can be known, adopt electrolytic solution of the present invention and differential arc oxidation method that zirconium or zirconium alloy surface are carried out after differential arc oxidation handles, compared with prior art, the corrosion resistance nature that the present invention handles the workpiece surface that obtains is greatly enhanced; The resistance to soiling and the compactness of the micro-arc oxidation films that obtains by differential arc oxidation are all fine, and the wear resistance of this micro-arc oxidation films, hardness, electrical insulating property are all very high simultaneously, have widened the Application Areas that zirconium closes zirconium alloy greatly.
More as can be seen, adopt preferred version of the present invention from the test result of A1-A4 and A5, promptly control when each composition is in suitable scope in the electrolytic solution, adopt the various performances of the zirconium alloy workpiece surface that this electrolytic bath micro arc oxide treatment obtains more excellent.

Claims (11)

1. an electrolytic solution is characterized in that, described electrolytic solution is the aqueous solution, contains water-soluble carboxylate, the alkali metal hydroxide of fluozirconate, fluoroborate, zinc in the described aqueous solution.
2. electrolytic solution according to claim 1, it is characterized in that the content of fluozirconate is 2~10g/L in the described electrolytic solution, the content of fluoroborate is 1~12g/L, the content of the water-soluble carboxylate of zinc is 1~8g/L, and the content of alkali metal hydroxide is 1~10g/L.
3. electrolytic solution according to claim 2, it is characterized in that the content of fluozirconate is 4~8g/L in the described electrolytic solution, the content of fluoroborate is 4~8g/L, the content of the water-soluble carboxylate of zinc is 4~6g/L, and the content of alkali metal hydroxide is 4~8g/L.
4. electrolytic solution according to claim 1 is characterized in that, described fluozirconate is potassium fluozirconate and/or sodium fluozirconate.
5. electrolytic solution according to claim 1 is characterized in that, described fluoroborate is potassium fluoborate and/or Sodium tetrafluoroborate.
6. electrolytic solution according to claim 1 is characterized in that, carbon atom quantity is 2~12 in the water-soluble carboxylate of described zinc.
7. zirconium or zirconium alloy surface micro-arc oxidation method, this method comprises zirconium or zirconium alloy is placed the electrolyzer that fills electrolytic solution, with zirconium or zirconium alloy is anode, with the stainless steel plate is negative electrode, under the condition of differential arc oxidation, make zirconium or zirconium alloy surface form micro-arc oxidation films, it is characterized in that described electrolytic solution is any described electrolytic solution among the claim 1-6.
8. method according to claim 7 is characterized in that, the thickness of described micro-arc oxidation films is 6~40 microns.
9. method according to claim 7 is characterized in that, the condition of described differential arc oxidation comprises that current density is 0.5~10A/dm 2, the temperature of electrolytic solution is 15~60 ℃, and voltage is 280~600V, and the time of differential arc oxidation is 5~30 minutes.
10. method according to claim 7 is characterized in that, this method is carried out pre-treatment, formed micro-arc oxidation films sealing of hole processing afterwards described zirconium or zirconium alloy before also being included in differential arc oxidation.
11. the differential arc oxidation film layer on zirconium or zirconium alloy surface, described rete is by zirconium or zirconium alloy are placed the electrolyzer that fills electrolytic solution, with zirconium or zirconium alloy is anode, with the stainless steel plate is negative electrode, under the condition of differential arc oxidation, prepare, it is characterized in that described electrolytic solution is any described electrolytic solution among the claim 1-6.
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CN106117217A (en) * 2016-06-08 2016-11-16 南京远淑医药科技有限公司 A kind of preparation method of fluozirconate
CN106117217B (en) * 2016-06-08 2018-07-10 南京远淑医药科技有限公司 A kind of preparation method of fluozirconate
CN107794558A (en) * 2016-08-31 2018-03-13 昆山汉鼎精密金属有限公司 Aluminum alloy surface color method and its products formed
CN108220887A (en) * 2017-12-27 2018-06-29 天津师范大学 The preparation method of zircaloy corrosion of elements protection film in a kind of reactor
CN108220887B (en) * 2017-12-27 2019-08-23 天津师范大学 The preparation method of zircaloy corrosion of elements protection film in a kind of reactor

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