GB803357A - Method of electrolytic oxidation of aluminium alloys - Google Patents
Method of electrolytic oxidation of aluminium alloysInfo
- Publication number
- GB803357A GB803357A GB469/56A GB46956A GB803357A GB 803357 A GB803357 A GB 803357A GB 469/56 A GB469/56 A GB 469/56A GB 46956 A GB46956 A GB 46956A GB 803357 A GB803357 A GB 803357A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pickling
- jan
- electrolytically
- electrolytic oxidation
- aluminium alloys
- 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
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
- C25D11/16—Pretreatment, e.g. desmutting
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
803,357. Anodizing aluminium alloys. SCHMIDT G.m.b.H., K. Jan. 5, 1956 [Jan. 7, 1955], No. 469/56. Class 41. Aluminium alloy articles such as pistons and cylinders for I.C. engines are electrolytically surface-oxidized by a process in which they are first pre-treated in a pickling or etching bath to remove those alloy components which would hinder electrolytic oxidation and then are mechanically treated to compact and/or smooth the porous and rough pickled surface. The pickling may be effected either chemically or electrolytically in nitric acid to which hydrofluoric acid may be added, followed, if desired, by heat treatment to remove occluded hydrogen formed during the pickling prior to mechanical compacting as by a gentle pass through a rolling mill or in the case of cylindrical members by the insertion of a slightly tapered mandrel. If a hard and strong surface layer is required, there may be used dilute sulphuric acid at a temperature between 0‹ and 3‹ C. with an applied voltage of 50 volts or more and a current density of, say, 7 amps./sq. dm.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE803357X | 1955-01-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB803357A true GB803357A (en) | 1958-10-22 |
Family
ID=6721489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB469/56A Expired GB803357A (en) | 1955-01-07 | 1956-01-05 | Method of electrolytic oxidation of aluminium alloys |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB803357A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2626131A1 (en) * | 1976-06-11 | 1977-12-22 | Mahle Gmbh | HARD ANODIZED LIGHT ALLOY PISTON |
| FR2524558A1 (en) * | 1982-04-06 | 1983-10-07 | Delozanne Jean Pierre | Hard anodised aluminium alloy pistons - especially for aero:modelling engines |
| US4801360A (en) * | 1985-06-19 | 1989-01-31 | Stc Plc | Surface treatment of aluminum/silicon alloys |
-
1956
- 1956-01-05 GB GB469/56A patent/GB803357A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2626131A1 (en) * | 1976-06-11 | 1977-12-22 | Mahle Gmbh | HARD ANODIZED LIGHT ALLOY PISTON |
| FR2524558A1 (en) * | 1982-04-06 | 1983-10-07 | Delozanne Jean Pierre | Hard anodised aluminium alloy pistons - especially for aero:modelling engines |
| US4801360A (en) * | 1985-06-19 | 1989-01-31 | Stc Plc | Surface treatment of aluminum/silicon alloys |
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