GB1464857A - Chromic acid anodising of aluminium and its alloys - Google Patents
Chromic acid anodising of aluminium and its alloysInfo
- Publication number
- GB1464857A GB1464857A GB623473A GB623473A GB1464857A GB 1464857 A GB1464857 A GB 1464857A GB 623473 A GB623473 A GB 623473A GB 623473 A GB623473 A GB 623473A GB 1464857 A GB1464857 A GB 1464857A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chromic acid
- constant
- film
- alloys
- aluminium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 title abstract 3
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 title abstract 3
- 229910052782 aluminium Inorganic materials 0.000 title abstract 2
- 238000007743 anodising Methods 0.000 title abstract 2
- 229910045601 alloy Inorganic materials 0.000 title 1
- 239000000956 alloy Substances 0.000 title 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title 1
- 239000004411 aluminium Substances 0.000 title 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 abstract 2
- 229910000838 Al alloy Inorganic materials 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 abstract 1
- 238000013019 agitation Methods 0.000 abstract 1
- 238000009835 boiling Methods 0.000 abstract 1
- 238000005238 degreasing Methods 0.000 abstract 1
- 238000005530 etching Methods 0.000 abstract 1
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 abstract 1
- 239000004922 lacquer Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 238000005498 polishing Methods 0.000 abstract 1
- 239000011148 porous material Substances 0.000 abstract 1
- 238000002203 pretreatment Methods 0.000 abstract 1
- 239000011347 resin Substances 0.000 abstract 1
- 229920005989 resin Polymers 0.000 abstract 1
- 239000010959 steel Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 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
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
- C25D11/08—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing inorganic acids
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Printing Plates And Materials Therefor (AREA)
Abstract
1464857 Anodizing Al in chromic acid NATIONAL RESEARCH DEVELOPMENT CORP 8 May 1974 [8 Feb 1973 12 June 1973] 6234/73 and 27850/73 Heading C7B Al or Al alloy is anodized in chromic acid of 0À05-0À7M at 55 to 70‹C at a c.d. below 50 mA/cm<SP>2</SP> but, for at least the major portion of the process, above 6 mA/cm<SP>2</SP> to produce an anodic film of thickness at least 15Á. Conditions are e.g. 90-150V for up to 90 mins. D.C. with up to 10 per cent A.C. may be used. Air agitation at the electrodes is specified with a steel cathode, and cathode: anode area ratio from 10-30:1. Increased V at constant c.d. produces a film having pores whose size increases towards the Al surface. Operation at constant V is possible. The anodic film may be sealed in boiling water or steam or with a lacquer or resin. Pre-treatments include degreasing and etching in inhibited NaOH or electro-polishing in HClO 4 /ethanol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB623473A GB1464857A (en) | 1974-05-08 | 1974-05-08 | Chromic acid anodising of aluminium and its alloys |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB623473A GB1464857A (en) | 1974-05-08 | 1974-05-08 | Chromic acid anodising of aluminium and its alloys |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1464857A true GB1464857A (en) | 1977-02-16 |
Family
ID=9810852
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB623473A Expired GB1464857A (en) | 1974-05-08 | 1974-05-08 | Chromic acid anodising of aluminium and its alloys |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1464857A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2136448A (en) * | 1983-03-18 | 1984-09-19 | Nippon Light Metal Co | Anodising Aluminium Substrate for Magnetic Recording Media |
| US4507179A (en) * | 1984-03-01 | 1985-03-26 | Nippon Light Metal Company Limited | Process of producing aluminum substrate for magnetic recording media |
| GB2173819A (en) * | 1985-03-26 | 1986-10-22 | British Aerospace | Chromic acid anodising of aluminium prior to adhesive bonding |
| EP0216543A1 (en) * | 1985-09-04 | 1987-04-01 | Furukawa Aluminum Co., Ltd. | Method of manufacturing of an anodized memory disc substrate |
-
1974
- 1974-05-08 GB GB623473A patent/GB1464857A/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2136448A (en) * | 1983-03-18 | 1984-09-19 | Nippon Light Metal Co | Anodising Aluminium Substrate for Magnetic Recording Media |
| US4507179A (en) * | 1984-03-01 | 1985-03-26 | Nippon Light Metal Company Limited | Process of producing aluminum substrate for magnetic recording media |
| GB2173819A (en) * | 1985-03-26 | 1986-10-22 | British Aerospace | Chromic acid anodising of aluminium prior to adhesive bonding |
| US4690736A (en) * | 1985-03-26 | 1987-09-01 | British Aerospace Public Limited Company | Chromic acid anodizing of aluminium prior to adhesive bonding |
| GB2173819B (en) * | 1985-03-26 | 1989-07-12 | British Aerospace | Chromic acid anodising of aluminium prior to adhesive bonding |
| EP0216543A1 (en) * | 1985-09-04 | 1987-04-01 | Furukawa Aluminum Co., Ltd. | Method of manufacturing of an anodized memory disc substrate |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |