CN113652726A - Sealing liquid for preventing aluminum piece anodized black film from high-temperature discoloration, and preparation and use methods thereof - Google Patents
Sealing liquid for preventing aluminum piece anodized black film from high-temperature discoloration, and preparation and use methods thereof Download PDFInfo
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- CN113652726A CN113652726A CN202110871950.1A CN202110871950A CN113652726A CN 113652726 A CN113652726 A CN 113652726A CN 202110871950 A CN202110871950 A CN 202110871950A CN 113652726 A CN113652726 A CN 113652726A
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- temperature
- sealing liquid
- alkane
- sodium fluoride
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- 239000007788 liquid Substances 0.000 title claims abstract description 62
- 238000007789 sealing Methods 0.000 title claims abstract description 58
- 238000002360 preparation method Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000002845 discoloration Methods 0.000 title claims description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title description 15
- 229910052782 aluminium Inorganic materials 0.000 title description 15
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims abstract description 74
- 150000001335 aliphatic alkanes Chemical class 0.000 claims abstract description 37
- 235000013024 sodium fluoride Nutrition 0.000 claims abstract description 37
- 239000011775 sodium fluoride Substances 0.000 claims abstract description 37
- 238000003756 stirring Methods 0.000 claims abstract description 27
- 239000012153 distilled water Substances 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000001035 drying Methods 0.000 claims description 12
- 229910000838 Al alloy Inorganic materials 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 8
- 238000004321 preservation Methods 0.000 claims description 5
- 238000002048 anodisation reaction Methods 0.000 claims 1
- 239000012528 membrane Substances 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 3
- 238000004381 surface treatment Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 10
- 230000008859 change Effects 0.000 description 7
- 238000007664 blowing Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 238000007743 anodising Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 5
- 238000005266 casting Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
Classifications
-
- 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
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/18—After-treatment, e.g. pore-sealing
- C25D11/24—Chemical after-treatment
- C25D11/246—Chemical after-treatment for sealing layers
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
- Sealing Material Composition (AREA)
Abstract
The invention belongs to the technical field of surface treatment, and relates to a sealing liquid for preventing an anodized black film of an aluminum part from discoloring at high temperature, a preparation method and a use method thereof, wherein the sealing liquid comprises the following components in parts by weight: sodium fluoride: alkane admixture: distilled water was 2: 6: 100-35: 70: 1000, parts by weight; the preparation method comprises the following steps: heating appropriate amount of distilled water to 70-80 deg.C, and adding sodium fluoride at constant temperature of 70-80 deg.C in proportion; stirring until sodium fluoride is completely dissolved, and keeping the temperature at 70-80 deg.C; adding an alkane blender in proportion, continuously stirring and simultaneously heating to 100 ℃, continuously stirring and simultaneously keeping 100 ℃ after the alkane blender is completely and uniformly dispersed in the solution, preserving heat, and then reducing the temperature of the solution to 70-80 ℃ to finish the preparation; the part film processed by the novel process of the temperature-resistant sealing liquid is bright, uniform and complete, and the temperature-resistant color-changing grade of the part film can be improved. Is suitable for small parts and large parts, and can be popularized and used for military industry, aerospace, ships, civil use and the like.
Description
Technical Field
The invention belongs to the technical field of surface treatment, and relates to a sealing liquid for preventing an anodized black film of an aluminum piece from changing color at high temperature, and a preparation method and a use method thereof.
Background
At present, an aluminum part is anodized in a sulfuric acid tank solution to form a film, the part anodized in black gradually changes color at 70 ℃, the part anodized in black slightly changes into black and red slightly at 100 ℃, the color change is more obvious at 150 ℃, the part anodized in black completely changes into red when heated at 170-180 ℃ for 20-30 minutes, and the part anodized in black completely changes into red when heated to 180-200 ℃, and the part anodized in black processed by the traditional process cannot meet the normal use of products.
If the part is heated to 170 ℃ and 180 ℃ in the subsequent processing, the black anodized film turns red, which affects the appearance of the film layer and prevents the part from being used normally.
Disclosure of Invention
The purpose of the invention is: provides a sealing liquid for preventing the high-temperature discoloration of an anodized black film of an aluminum piece and a preparation method thereof.
In order to solve the technical problem, the technical scheme of the invention is as follows:
on one hand, the invention provides a sealing liquid for preventing an anodized black film of an aluminum piece from discoloring at high temperature, which comprises the following components in parts by weight: sodium fluoride: alkane admixture: distilled water was 2: 6: 100-35: 70: 1000.
further, the sealing liquid comprises the following components in parts by weight: sodium fluoride: alkane admixture: distilled water was 2: 5: 100-3: 7: 100.
preferably, the sealing liquid comprises the following components in percentage by weight: sodium fluoride: alkane admixture: the distilled water is 22: 63: 1000.
in another aspect, the invention provides a method for preparing a sealing liquid for preventing high-temperature discoloration of an anodized black film of an aluminum piece, which comprises the following steps:
step one, heating a proper amount of distilled water to 70-80 ℃, and proportionally adding sodium fluoride at constant temperature of 70-80 ℃;
stirring until the sodium fluoride is completely dissolved, and simultaneously ensuring the constant temperature to be 70-80 ℃, and preserving the heat;
and step three, adding the alkane blender in proportion, continuously stirring and simultaneously heating to 100 ℃, continuously stirring and simultaneously keeping 100 ℃ after the alkane blender is completely and uniformly dispersed in the solution, preserving heat, and then cooling the solution to 70-80 ℃ to complete the preparation.
And the heat preservation time of the second step is 10-20 minutes.
And the heat preservation time of the step three is 20-30 minutes.
Further, the invention also provides a using method of the sealing liquid for preventing the high-temperature discoloration of the anodized black film of the aluminum piece, which comprises the following steps:
after the part is anodized to be black, the part is immersed in a temperature-resistant sealing liquid at the temperature of 70-80 ℃ for 35-40 minutes, taken out of the tank, blown dry and baked at the temperature of 70-80 ℃ for 15-20 minutes.
Further, the step of immersing in the temperature-resistant sealing liquid also comprises the step of pretreating the parts: pre-heating the parts at 50-60 deg.c for 20-30 min. The purpose is to prevent the temperature of the tank from decreasing when the parts are immersed, which affects the effect.
Preferably, the operation of drying moisture is also included before the part pretreatment, so that other liquid or impurities are prevented from being brought into the temperature-resistant sealing liquid.
The invention has the beneficial effects that:
the part anodized black through the temperature-resistant sealing treatment of the temperature-resistant sealing liquid does not slightly change color in the temperature environment of 70 ℃, the part anodized black film does not slightly change into black red when the temperature exceeds 100 ℃, and the part anodized black film does not change into red when the temperature exceeds 170 ℃ and 180 ℃.
The part film processed by the novel process of the temperature-resistant sealing liquid is bright, uniform and complete, and the temperature-resistant color-changing grade of the part film can be improved. Is suitable for small parts and large parts, and can be popularized and used for military industry, aerospace, ships, civil use and the like.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Features of various aspects of embodiments of the invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without these specific details. The following description of the embodiments is merely intended to better understand the present invention by illustrating examples thereof. The present invention is not limited to any particular arrangement or method provided below, but rather covers all product structures, any modifications, alterations, etc. of the method covered without departing from the spirit of the invention.
In the following description, well-known structures and techniques are not shown to avoid unnecessarily obscuring the present invention.
Example 1
The housing with the outer circle of phi 350 and the material aluminum alloy 2A12 are anodized to be black, and the anodized black temperature resistance can be improved from 150 ℃ to 180 ℃ without color change after being treated by sealing liquid.
Preparation of the blocking solution
The solute for preparing the sealing liquid is a mixture of sodium fluoride and alkane, and the sealing liquid comprises the following components in parts by weight: sodium fluoride: alkane admixture: distilled water was 2: 6: 100.
the preparation method of the sealing liquid for preventing the high-temperature discoloration of the anodized black film of the aluminum piece comprises the following steps:
step one, heating a proper amount of distilled water to 70 ℃, and adding sodium fluoride in proportion at a constant temperature of 70 ℃;
stirring until the sodium fluoride is completely dissolved, and simultaneously ensuring the constant temperature of 70 ℃, and keeping the temperature for 20 minutes;
and step three, adding the alkane blender in proportion, continuously stirring and heating to 100 ℃, continuously stirring and keeping the temperature at 100 ℃ after the alkane blender is completely and uniformly dispersed in the solution, preserving the temperature for 30 minutes, and then cooling the solution to 70 ℃ to complete the preparation.
Closing operation
And (3) anodizing the shell with the outer circle of phi 350 and the aluminum alloy 2A12 serving as a material to be black, drying the shell by blowing, preheating the shell to 60 ℃, preserving the heat for 20 minutes, immersing the shell in a temperature-resistant sealing liquid at 70 ℃ for 40 minutes, taking the shell out of the tank, drying the shell by blowing, and baking the shell at 70 ℃ for 20 minutes.
Example 2
The outer circle of the end cover is phi 359, and the material is aluminum alloy 3A 21. The anodized film is black, and after being treated by sealing liquid, the anodized film can resist the temperature from 150 ℃ to 190 ℃ without changing color.
Preparation of the blocking solution
The solute for preparing the sealing liquid is a mixture of sodium fluoride and alkane, and the sealing liquid comprises the following components in parts by weight: sodium fluoride: alkane admixture: the distilled water is 35: 70: 1000.
the preparation method of the sealing liquid for preventing the high-temperature discoloration of the anodized black film of the aluminum piece comprises the following steps:
step one, heating a proper amount of distilled water to 80 ℃, and adding sodium fluoride in proportion at a constant temperature of 80 ℃;
stirring until the sodium fluoride is completely dissolved, and simultaneously ensuring the constant temperature of 80 ℃, and keeping the temperature for 20 minutes;
and step three, adding the alkane blender in proportion, continuously stirring and heating to 100 ℃, continuously stirring and keeping the temperature at 100 ℃ after the alkane blender is completely and uniformly dispersed in the solution, preserving the temperature for 30 minutes, and then cooling the solution to 70 ℃ to complete the preparation.
Closing operation
The end cover of phi 359 is dried after being anodized to black by using aluminum alloy 3A21 as a material, is preheated to 60 ℃ and is soaked in a temperature-resistant sealing liquid at 80 ℃ for 40 minutes after being kept warm for 20 minutes, and is dried after being taken out of a tank and is baked for 20 minutes at 80 ℃.
Example 3
The outer circle of the end cover is phi 35, and the material is aluminum alloy 7A 04. The anodized film is black, and after being treated by sealing liquid, the anodized film can resist the temperature from 150 ℃ to 200 ℃ without changing color.
Preparation of the blocking solution
The solute for preparing the sealing liquid is a mixture of sodium fluoride and alkane, and the sealing liquid comprises the following components in parts by weight: sodium fluoride: alkane admixture: the distilled water is 30: 65: 1000.
the preparation method of the sealing liquid for preventing the high-temperature discoloration of the anodized black film of the aluminum piece comprises the following steps:
step one, heating a proper amount of distilled water to 75 ℃, and adding sodium fluoride in proportion at a constant temperature of 75 ℃;
stirring until the sodium fluoride is completely dissolved, and simultaneously ensuring the constant temperature to be 75 ℃, and keeping the temperature for 15 minutes;
and step three, adding the alkane blender in proportion, continuously stirring and heating to 100 ℃, continuously stirring and keeping the temperature at 100 ℃ after the alkane blender is completely and uniformly dispersed in the solution, preserving the temperature for 30 minutes, and then cooling the solution to 75 ℃ to finish the preparation.
Closing operation
And (3) anodizing the end cover with the outer circle of phi 35 and the aluminum alloy 7A04 serving as a material to be black, drying the end cover by blowing, preheating the end cover at 60 ℃, preserving the heat for 20 minutes, immersing the end cover in a heat-resistant sealing liquid at 75 ℃ for 35 minutes, taking the end cover out of the tank, drying the end cover by blowing, and baking the end cover at 70 ℃ for 15 minutes.
Example 4
The outer circle of the shell is phi 37, and the material is cast aluminum alloy ZL 105. The anodized part is black, and after being treated by the sealing liquid, the temperature resistance of the anodized part is black and can be improved from 150 ℃ to 180 ℃ without color change.
Preparation of the blocking solution
The solute for preparing the sealing liquid is a mixture of sodium fluoride and alkane, and the sealing liquid comprises the following components in parts by weight: sodium fluoride: alkane admixture: distilled water was 2: 6: 100.
the preparation method of the sealing liquid for preventing the high-temperature discoloration of the anodized black film of the aluminum piece comprises the following steps:
step one, heating a proper amount of distilled water to 70 ℃, and adding sodium fluoride in proportion at a constant temperature of 70 ℃;
stirring until the sodium fluoride is completely dissolved, and simultaneously ensuring the constant temperature of 70 ℃, and keeping the temperature for 20 minutes;
and step three, adding the alkane blender in proportion, continuously stirring and heating to 100 ℃, continuously stirring and keeping the temperature at 100 ℃ after the alkane blender is completely and uniformly dispersed in the solution, preserving the temperature for 30 minutes, and then cooling the solution to 70 ℃ to complete the preparation.
Closing operation
Casting aluminum alloy ZL105 on the shell with the outer circle of phi 37, drying after anodizing to black, preheating to 60 ℃, preserving heat for 20 minutes, immersing in 70-DEG C temperature-resistant sealing liquid for 40 minutes, taking out of the tank, drying by blowing, and baking for 20 minutes at 70 ℃.
Example 5
The outer circle of the end cover is phi 135, and the material is cast aluminum alloy ZL 104. The anodized film is black, and after being treated by sealing liquid, the anodized film can resist the temperature from 150 ℃ to 200 ℃ without changing color.
Preparation of the blocking solution
The solute for preparing the sealing liquid is a mixture of sodium fluoride and alkane, and the sealing liquid comprises the following components in parts by weight: sodium fluoride: alkane admixture: the distilled water is 35: 70: 1000.
the preparation method of the sealing liquid for preventing the high-temperature discoloration of the anodized black film of the aluminum piece comprises the following steps:
step one, heating a proper amount of distilled water to 80 ℃, and adding sodium fluoride in proportion at a constant temperature of 80 ℃;
stirring until the sodium fluoride is completely dissolved, and simultaneously ensuring the constant temperature of 80 ℃, and keeping the temperature for 20 minutes;
and step three, adding the alkane blender in proportion, continuously stirring and heating to 100 ℃, continuously stirring and keeping the temperature at 100 ℃ after the alkane blender is completely and uniformly dispersed in the solution, preserving the temperature for 30 minutes, and then cooling the solution to 70 ℃ to complete the preparation.
Closing operation
Casting aluminum alloy ZL104 as the material of the phi 135 end cover, drying after anodizing to black, preheating at 60 ℃, soaking in 80-DEG C temperature-resistant sealing liquid for 40 minutes after heat preservation for 20 minutes, drying after discharging from a tank, and baking at 80 ℃ for 20 minutes.
Example 6
The outer circle of the end cover is phi 960, and the material is cast aluminum HZL-101. The anodized part is black, and after being treated by the sealing liquid, the temperature resistance of the anodized part is increased from 150 ℃ to 195 ℃ without color change.
Preparing a sealing liquid:
the solute for preparing the sealing liquid is a mixture of sodium fluoride and alkane, and the sealing liquid comprises the following components in parts by weight: sodium fluoride: alkane admixture: the distilled water is 30: 65: 1000.
the preparation method of the sealing liquid for preventing the high-temperature discoloration of the anodized black film of the aluminum piece comprises the following steps:
step one, heating a proper amount of distilled water to 75 ℃, and adding sodium fluoride in proportion at a constant temperature of 75 ℃;
stirring until the sodium fluoride is completely dissolved, and simultaneously ensuring the constant temperature to be 75 ℃, and keeping the temperature for 15 minutes;
and step three, adding the alkane blender in proportion, continuously stirring and heating to 100 ℃, continuously stirring and keeping the temperature at 100 ℃ after the alkane blender is completely and uniformly dispersed in the solution, preserving the temperature for 30 minutes, and then cooling the solution to 75 ℃ to finish the preparation.
Closing operation
And (3) casting aluminum HZL-101 on the end cover with the outer circle of phi 960, drying after anodizing to black, preheating at 60 ℃, soaking in 75 ℃ temperature-resistant sealing liquid for 35 minutes after preserving heat for 20 minutes, taking out of the tank, drying by blowing, and baking at 70 ℃ for 15 minutes.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.
Claims (10)
1. The utility model provides a prevent that aluminium part anodization black membrane high temperature from changing color's confining liquid which characterized in that:
the sealing liquid comprises the following components in parts by weight: sodium fluoride: alkane admixture: distilled water was 2: 6: 100-35: 70: 1000.
2. the confining liquid as claimed in claim 1, wherein: the sealing liquid comprises the following components in parts by weight: sodium fluoride: alkane admixture: distilled water was 2: 5: 100-3: 7: 100.
3. the confining liquid as claimed in claim 1, wherein: the sealing liquid comprises the following components in parts by weight: sodium fluoride: alkane admixture: the distilled water is 22: 63: 1000.
4. the confining liquid as claimed in claim 1, wherein: the sealing liquid is suitable for aluminum alloy.
5. A preparation method of the sealing liquid for preventing the high-temperature discoloration of the anodized black film of the aluminum part as defined in claim 1, is characterized in that: the preparation method comprises the following steps:
step one, heating a proper amount of distilled water to 70-80 ℃, and proportionally adding sodium fluoride at constant temperature of 70-80 ℃;
stirring until the sodium fluoride is completely dissolved, and simultaneously ensuring the constant temperature to be 70-80 ℃, and preserving the heat;
and step three, adding the alkane blender in proportion, continuously stirring and simultaneously heating to 100 ℃, continuously stirring and simultaneously keeping 100 ℃ after the alkane blender is completely and uniformly dispersed in the solution, preserving heat, and then cooling the solution to 70-80 ℃ to complete the preparation.
6. The method of claim 5, wherein: and the heat preservation time of the second step is 10-20 minutes.
7. The method of claim 5, wherein: and step three, the heat preservation time is 20-30 minutes.
8. The use method of the sealing liquid for preventing the high-temperature discoloration of the anodized black film of the aluminum part as defined in claim 1, wherein the sealing liquid comprises the following steps: the using method comprises the following steps:
after the part is anodized to be black, the part is immersed in a temperature-resistant sealing liquid at the temperature of 70-80 ℃ for 35-40 minutes, taken out of the tank, blown dry and baked at the temperature of 70-80 ℃ for 15-20 minutes.
9. Use according to claim 8, characterized in that: the method also comprises the following steps of pretreating the parts before immersing in the temperature-resistant sealing liquid: pre-heating the parts at 50-60 deg.c for 20-30 min.
10. Use according to claim 9, characterized in that: the operation of drying moisture is also included before the part is pre-heated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110871950.1A CN113652726A (en) | 2021-07-30 | 2021-07-30 | Sealing liquid for preventing aluminum piece anodized black film from high-temperature discoloration, and preparation and use methods thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110871950.1A CN113652726A (en) | 2021-07-30 | 2021-07-30 | Sealing liquid for preventing aluminum piece anodized black film from high-temperature discoloration, and preparation and use methods thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113652726A true CN113652726A (en) | 2021-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110871950.1A Pending CN113652726A (en) | 2021-07-30 | 2021-07-30 | Sealing liquid for preventing aluminum piece anodized black film from high-temperature discoloration, and preparation and use methods thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150034487A1 (en) * | 2012-03-22 | 2015-02-05 | Nanogate Ag | Treatment of an anodically oxidized surface |
| CN108624935A (en) * | 2017-03-21 | 2018-10-09 | 上海铝通化学科技有限公司 | A kind of closing process of alkali resistance confining liquid and aluminum alloy surface oxidation film |
| CN110724994A (en) * | 2019-10-18 | 2020-01-24 | 北京曙光航空电气有限责任公司 | Sealing liquid for anodizing and using method thereof |
-
2021
- 2021-07-30 CN CN202110871950.1A patent/CN113652726A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150034487A1 (en) * | 2012-03-22 | 2015-02-05 | Nanogate Ag | Treatment of an anodically oxidized surface |
| CN108624935A (en) * | 2017-03-21 | 2018-10-09 | 上海铝通化学科技有限公司 | A kind of closing process of alkali resistance confining liquid and aluminum alloy surface oxidation film |
| CN110724994A (en) * | 2019-10-18 | 2020-01-24 | 北京曙光航空电气有限责任公司 | Sealing liquid for anodizing and using method thereof |
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Application publication date: 20211116 |