CN106835240A - Integrated film layer preparation method that magnesium lithium alloy thermal control is anti-corrosion - Google Patents
Integrated film layer preparation method that magnesium lithium alloy thermal control is anti-corrosion Download PDFInfo
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- CN106835240A CN106835240A CN201510884127.9A CN201510884127A CN106835240A CN 106835240 A CN106835240 A CN 106835240A CN 201510884127 A CN201510884127 A CN 201510884127A CN 106835240 A CN106835240 A CN 106835240A
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- film layer
- thermal control
- lithium alloy
- magnesium lithium
- arc oxidation
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/30—Anodisation of magnesium or alloys based thereon
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- Chemical Kinetics & Catalysis (AREA)
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- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The anti-corrosion integrated film layer preparation method of magnesium lithium alloy thermal control of the invention includes：Thermal control differential arc oxidation film layer is prepared on magnesium lithium alloy surface；Perfluoro alkane surface modification is carried out to thermal control differential arc oxidation film layer.The anti-corrosion integrated film layer control thermal effect of thermal control for preparing of the invention is good, anti-corrosion effect is good, and even compact, good with basal body binding force.
Description
Technical field
The present invention relates to material surface treatment, and in particular to a kind of anti-corrosion integrated film layer preparation method of magnesium lithium alloy thermal control.
Background technology
Magnesium lithium alloy is the minimum metal material of current density, while having excellent specific strength and specific stiffness, in spacecraft, many structural members, apparatus structure etc. are processing raw material from magnesium lithium alloy.
Heat control system is one of Major Systems of spacecraft, and spacecraft typically takes isothermal thermal control design scheme, based on passive control methods, be aided with local active control measures.Thermal control coating is one of major measure of passive control methods, will thermal control coating be coated in spacecraft inner and outer surfaces（Including instrument inner and outer surfaces）To adjust the hot-fluid for absorbing and radiating, temperature control is realized.
Because differential arc oxidation film layer has chemically stable high and good anti-wear performance, it is widely applied in space industry.Magnesium lithium alloy differential arc oxidation film layer category is electrochemically transformed film layer, is a kind of method in magnesium lithium alloy process for treating surface.Generally, differential arc oxidation film layer is prepared for improving the wearability of magnesium lithium alloy, or the adhesive property as a kind of surface peening means raising magnesium alloy and the adhesive force with organic coating on magnesium lithium alloy surface.In recent years, the technology that thermal control performance is realized by differential arc oxidation is also had been reported that, but differential arc oxidation film layer belongs to porous ceramics film layer, how in the case where ensureing that its thermal control performance is constant, improves its corrosion resisting property, and there is not been reported.The modification of perfluor silane surfaces is the method using chemistry, layer of transparent organic film is formed in metal surface, typically for preparing super-hydrophobic film layer, but it is hydride modified to carry out perfluor in thermal control micro-arc oxidation films layer surface, so as to improve its corrosion resisting property, there is not been reported.
The content of the invention
It is an object of the invention to provide a kind of anti-corrosion integrated film layer preparation method of magnesium lithium alloy thermal control, thermal control differential arc oxidation film layer is prepared by magnesium lithium alloy surface, perfluoro alkane surface modification is carried out to thermal control differential arc oxidation film layer, thermal control and the corrosion resisting property of magnesium lithium alloy is improved.
To achieve the above object, the present invention provides a kind of anti-corrosion integrated film layer preparation method of magnesium lithium alloy thermal control, including：Thermal control differential arc oxidation film layer is prepared on magnesium lithium alloy surface；Perfluoro alkane surface modification is carried out to thermal control differential arc oxidation film layer.
The above-mentioned anti-corrosion integrated film layer preparation method of magnesium lithium alloy thermal control, wherein, described to prepare thermal control differential arc oxidation film layer on magnesium lithium alloy surface, electrolyte is consisted of the following composition：Sodium metasilicate 10-15g/L, potassium hydroxide 2-5g/L, sodium fluoride 0.5-2g/L, potassium fluorozirconate 1-20 g/L, complexing agent 1-50g/L.
The above-mentioned anti-corrosion integrated film layer preparation method of magnesium lithium alloy thermal control, wherein, described to prepare thermal control differential arc oxidation film layer on magnesium lithium alloy surface, technological parameter is as follows：Current density 4-6A/dm2, frequency 400-600Hz, dutycycle 30-50%, time 40-90min, 10-15 DEG C of temperature.
The above-mentioned anti-corrosion integrated film layer preparation method of magnesium lithium alloy thermal control, wherein, described to carry out perfluoro alkane surface modification to thermal control differential arc oxidation film layer, technological parameter is as follows：Concentration：10~30
Vt.%, modifies the time：1~10min.
The above-mentioned anti-corrosion integrated film layer preparation method of magnesium lithium alloy thermal control, wherein, thermal control differential arc oxidation film layer is carried out after perfluoro alkane surface modification, curing process is carried out, technological parameter is as follows：Programming rate：45-55 DEG C/h, temperature：150 ± 5 DEG C, hardening time：60-100min.
The anti-corrosion integrated film layer preparation method of magnesium lithium alloy thermal control of the invention is creatively proposed and prepares thermal control film layer in magnesium lithium alloy product surface differential arc oxidation, then processed by perfluoro alkane surface modification, realize the preparation of the anti-corrosion integrated film layer of thermal control, the thermal control is anti-corrosion integrated film layer control thermal effect is good, anti-corrosion effect is good, and even compact, it is good with basal body binding force.
Specific embodiment
Integrated film layer preparation method anti-corrosion to magnesium lithium alloy thermal control of the invention is described in further detail below.
The anti-corrosion integrated film layer preparation method technological process of magnesium lithium alloy thermal control of present pre-ferred embodiments is as follows：
Before oxidation inspection → Solvent degreasing → electrochemical deoiling → hot water wash → pure water wash → differential arc oxidation → pure water washes → surface modification → pure water washes → solidify.
Before magnesium lithium alloy surface prepares thermal control differential arc oxidation film layer, oxidation pre-treatment first is carried out to magnesium lithium alloy surface, the oxidation pre-treatment includes that the preceding inspection of oxidation, Solvent degreasing, electrochemical deoiling, hot water wash, pure water are washed；After magnesium lithium alloy surface prepares thermal control differential arc oxidation film layer, thermal control differential arc oxidation film layer is cleaned with pure water, then perfluoro alkane surface modification is carried out to thermal control differential arc oxidation film layer.
Now master operation in technological process is described in detail.
1）Solvent degreasing
Oil removing is carried out using aviation gasoline, acetone, next procedure is turned after pure water rinsing.
2）Electrochemical deoiling
As shown in table 1, oil removing solution composition is made up of electrochemical deoiling operation sodium carbonate, sodium metasilicate, sodium phosphate and surfactant.
Table 1 Electrochemical deoiling operation
| 30--60g/L | |
| 20--30g/L | |
| 40--60 g/L | |
| Surfactant | A little |
| Temperature | 70-80℃ |
| Time | 5-10min |
3）Differential arc oxidation
Thermal control differential arc oxidation film layer is prepared on magnesium lithium alloy surface, its electrolyte is consisted of the following composition：Sodium metasilicate 10-15g/L, potassium hydroxide 2-5g/L, sodium fluoride 0.5-2g/L, potassium fluorozirconate 1-20 g/L, complexing agent 1-50g/L.
Technological parameter is as follows：Current density 4-6A/dm2, frequency 400-600Hz, dutycycle 30-50%, time 40-90min, 10-15 DEG C of temperature.
4）Surface modification
Table perfluoro alkane surface modification is carried out to thermal control differential arc oxidation film layer, operating condition is as follows：
Perfluoro alkane concentration：10 ~ 30 vt.%,
Temperature：25 ± 5 DEG C,
The modification time： 1~10 min .
5）Solidification
Curing process is carried out to the thermal control differential arc oxidation film layer after perfluoro alkane surface modification, operating condition is as follows：
Programming rate：50 DEG C/h,
Temperature：150 ± 5 DEG C,
Hardening time：1h .
Experiment shows, the anti-corrosion integrated film layer of thermal control prepared by the present invention, its emissivity（εH）It is not less than 0.86, solar absorptance（αs）No more than 0.35, salt spray resistance is not less than 480 hours, and the anti-corrosion integrated film layer even compact of the thermal control, good with basal body binding force.
Claims (5)
1. the anti-corrosion integrated film layer preparation method of magnesium lithium alloy thermal control, it is characterised in that including：
Thermal control differential arc oxidation film layer is prepared on magnesium lithium alloy surface；
Perfluoro alkane surface modification is carried out to thermal control differential arc oxidation film layer.
2. the anti-corrosion integrated film layer preparation method of magnesium lithium alloy thermal control as claimed in claim 1, it is characterised in that described to prepare thermal control differential arc oxidation film layer on magnesium lithium alloy surface, electrolyte is consisted of the following composition：Sodium metasilicate 10-15g/L, potassium hydroxide 2-5g/L, sodium fluoride 0.5-2g/L, potassium fluorozirconate 1-20 g/L, complexing agent 1-50g/L.
3. the anti-corrosion integrated film layer preparation method of magnesium lithium alloy thermal control as claimed in claim 1, it is characterised in that described to prepare thermal control differential arc oxidation film layer on magnesium lithium alloy surface, technological parameter is as follows：Current density 4-6A/dm2, frequency 400-600Hz, dutycycle 30-50%, time 40-90min, 10-15 DEG C of temperature.
4. the anti-corrosion integrated film layer preparation method of magnesium lithium alloy thermal control as claimed in claim 1, it is characterised in that described to carry out perfluoro alkane surface modification to thermal control differential arc oxidation film layer, technological parameter is as follows：Concentration：10 ~ 30 vt.%, modify the time：1~10min.
5. the anti-corrosion integrated film layer preparation method of magnesium lithium alloy thermal control as claimed in claim 1, it is characterised in that carried out to thermal control differential arc oxidation film layer after perfluoro alkane surface modification, carry out curing process, technological parameter is as follows：Programming rate：45-55 DEG C/h, temperature：150 ± 5 DEG C, hardening time：60-100min.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109537024A (en) * | 2018-11-14 | 2019-03-29 | 北京卫星制造厂有限公司 | A kind of thermal control film layer on magnesium lithium alloy surface and preparation method thereof |
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Application publication date: 20170613 |