US2142564A - Process for electrodeposition on aluminum and aluminum alloys - Google Patents
Process for electrodeposition on aluminum and aluminum alloys Download PDFInfo
- Publication number
- US2142564A US2142564A US111389D US11138936D US2142564A US 2142564 A US2142564 A US 2142564A US 111389 D US111389 D US 111389D US 11138936 D US11138936 D US 11138936D US 2142564 A US2142564 A US 2142564A
- Authority
- US
- United States
- Prior art keywords
- aluminum
- acid
- solution
- articles
- copper
- 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 - Lifetime
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
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
- C25D5/42—Pretreatment of metallic surfaces to be electroplated of light metals
- C25D5/44—Aluminium
Definitions
- the other group of the pickling'solutions for the preparatory treatment of the aluminum or its alloys prior to the galvanizing process include the alkaline pickling solutions of which chiefly zincate dipping solutions are being used.
- the eiiect of the latter principally consists therein, that a firmly adhering coating of zinc is deposited upon the aluminum and subsequently the desired metallic deposit upon said zinc coating in an appropriate manner, whereby a better adhesiveness of the electro-galvanic deposits is ensured than if the latter were applied directly upon the aluminum.
- the alkaline zincate dipping solution is recommended not only for nickelplating aluminum, but also for the galvanic treatment of the aluminum in alkaline or cyanide baths.
- the present application now elucidates a process, by means of which the possibility of obtaining properly adhering deposits, particularly in alkaline baths, will be rendered practically certain.
- this process the aluminum articles are, after the usual degreasing process, treated with a zincate solution or solution to which copper salts have been added.
- composition of the dipping solutions adapted for the present invention for preparatorily treating the aluminum prior to the subsequent galvanization in cyanide baths is not a matter of indifierence.
- the eificiency of the dipping solution rather depends upon its content of free caustic potash, zinc and copper. It has, as a matter of fact, been ascertained, that the indicated aim would best be attained by means of dipping solutions, the content of free alkali of which is about 3 to 15 times normal, whilst the content of zinc should correspond at least to simple normality.
- the copper content of these solutions is then to be kept within the limits of from about 1.5 to 8.0 g. of copper per liter.
- the copper is present wholly or for the greatest part in univalent form. This will be attained, if the copper is added in the form of potassium copper cyanide or other soluble cuprous salts.
- reducing agents such as sodium-sulphite and/or similarly acting substances are added to the dipping solutions.
- the articles preparatorily treated with the dipping solution can be galvanized directly in alkaline or cyanide baths. With certain alloys, par ticularly if they contain copper, and properly burnished articles, it often proves suitable to remove the deposit formed by the dipping solution, by means of oxidizing agents, such as nitric acid or acid mixtures containing nitric acid and to repeat subsequently the treatment with the cuprous zincate dipping solution. This process can, if necessary, be repeated a few times.
- alkali carbonate and/or alkaline salts of fatty acids and/or alkaline salts of inorganic'acids As fatty acids will have to be considered in this case, above all, acid with a low molecular weight, such as formic acid, acetic acid, propionic acid, etc., as inorganic acids, phosphoric acid, boric acid, etc.
- a dipping solution for the preparatory treatment of the aluminum, according to the present invention is composed, e. g. as follows:
- Example 1 To an ordinary copper bath prepared with potassium-copper-cyanide, 10 to 20 g. of pulverized boric acid are added and the copper plating process carried through in known manner.
- the galvanized articles of aluminum are, according to the present invention, after having been copper-plated, brass-plated and the like, treated for some time with weakly acid solutions.
- Aqueous solutions containing 1 to 5% of acid may be used.
- the treatment can consist in boiling the galvanized aluminum articles in a 2-5% solution of boric acid or in a solution of tartaric acid or the like.
- Process according to claim 1 characterized in that the deposit caused to appear on the aluminum on dipping, is removed by means of oxidizing agents of such character as to be capable or removing said deposit and produced anew as a result of a repeated dipping into the zincate solution.
- Process according to claim 1 characterized in that to the alkaline baths used for electroplating purposes, substances acting as acid, are added, the dissociation constant of which does not exceed the value of 110- 9.
- Process according to claim 13 characterized in that the electroplated aluminum articles are subjected to an after-treatment with a solution of an acid, the concentration thereof being such that it does not attack the electroplated articles or only inconsiderably, said after-treatment being conducted at a temperature up to and including the boiling point of said solution.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Electroplating Methods And Accessories (AREA)
- Electroplating And Plating Baths Therefor (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE466949X | 1935-11-19 | ||
DESCH108506D DE663979C (de) | 1935-11-19 | 1935-11-20 | Herstellung galvanischer Niederschlaege auf Aluminium und Aluminiumlegierungen |
Publications (1)
Publication Number | Publication Date |
---|---|
US2142564A true US2142564A (en) | 1939-01-03 |
Family
ID=25944075
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US111389D Expired - Lifetime US2142564A (en) | 1935-11-19 | 1936-11-18 | Process for electrodeposition on aluminum and aluminum alloys |
Country Status (4)
Country | Link |
---|---|
US (1) | US2142564A (de) |
DE (1) | DE663979C (de) |
FR (1) | FR813761A (de) |
GB (1) | GB466949A (de) |
Cited By (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2506164A (en) * | 1947-10-15 | 1950-05-02 | John E Morse | Method for the production of metallic printing members |
US2650886A (en) * | 1951-01-19 | 1953-09-01 | Aluminum Co Of America | Procedure and bath for plating on aluminum |
US2650901A (en) * | 1949-06-08 | 1953-09-01 | Horst Corp Of America V D | Electroplating on aluminum |
US2654701A (en) * | 1950-06-08 | 1953-10-06 | Edwin R Calderon | Plating aluminum |
US2662054A (en) * | 1950-09-08 | 1953-12-08 | United Chromium Inc | Method of electrodepositing chromium directly on aluminum |
US2676916A (en) * | 1949-09-23 | 1954-04-27 | Aluminum Co Of America | Electroplating on aluminum |
US2745799A (en) * | 1951-03-16 | 1956-05-15 | Pechiney Prod Chimiques Sa | Processes for coating aluminum and alloys thereof |
US2752302A (en) * | 1950-07-28 | 1956-06-26 | Warren Alloy | Process of treating aluminum work pieces |
US2891309A (en) * | 1956-12-17 | 1959-06-23 | American Leonic Mfg Company | Electroplating on aluminum wire |
US3075894A (en) * | 1959-01-23 | 1963-01-29 | Westinghouse Electric Corp | Method of electroplating on aluminum surfaces |
US3202529A (en) * | 1962-08-08 | 1965-08-24 | Sperry Rand Corp | Disposition of nickel-cobalt alloy on aluminum substrates |
US3455014A (en) * | 1968-01-11 | 1969-07-15 | M & T Chemicals Inc | Method of joining by plating aluminum and alloys thereof |
US3505181A (en) * | 1963-05-29 | 1970-04-07 | Secr Defence Brit | Treatment of titanium surfaces |
US3909209A (en) * | 1973-11-05 | 1975-09-30 | Gould Inc | Method of treating aluminum and aluminum alloys and article produced thereby |
US3920413A (en) * | 1974-04-05 | 1975-11-18 | Nasa | Panel for selectively absorbing solar thermal energy and the method of producing said panel |
US3989606A (en) * | 1975-09-26 | 1976-11-02 | Aluminum Company Of America | Metal plating on aluminum |
US4192722A (en) * | 1978-07-25 | 1980-03-11 | Reynolds Metals Company | Composition and method for stannate plating of large aluminum parts |
US5882802A (en) * | 1988-08-29 | 1999-03-16 | Ostolski; Marian J. | Noble metal coated, seeded bimetallic non-noble metal powders |
US20030155409A1 (en) * | 2001-11-21 | 2003-08-21 | Dockus Kostas F. | Fluxless brazing |
US6656606B1 (en) | 2000-08-17 | 2003-12-02 | The Westaim Corporation | Electroplated aluminum parts and process of production |
US20040035910A1 (en) * | 2001-11-21 | 2004-02-26 | Dockus Kostas F. | Low temperature fluxless brazing |
US20040038070A1 (en) * | 2001-11-21 | 2004-02-26 | Dockus Kostas F. | Fluxless brazing |
US20040035911A1 (en) * | 2001-11-21 | 2004-02-26 | Dockus Kostas F. | Fluxless brazing |
US20060027625A1 (en) * | 2001-11-21 | 2006-02-09 | Dana Canada Corporation | Products for use in low temperature fluxless brazing |
US20060102696A1 (en) * | 2001-11-21 | 2006-05-18 | Graham Michael E | Layered products for fluxless brazing of substrates |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE963658C (de) * | 1941-06-19 | 1957-05-09 | Rudolf Zuleger | Verfahren zur Herstellung von Schutzschichten auf Aluminium oder Aluminiumlegierungen unter Verwendung alkalischer Chromatbaeder |
US2739932A (en) * | 1952-09-05 | 1956-03-27 | Clarence W Forestek | Electrodepositing chromium on aluminum |
US3108006A (en) * | 1959-07-13 | 1963-10-22 | M & T Chemicals Inc | Plating on aluminum |
-
1935
- 1935-11-20 DE DESCH108506D patent/DE663979C/de not_active Expired
-
1936
- 1936-11-18 US US111389D patent/US2142564A/en not_active Expired - Lifetime
- 1936-11-19 FR FR813761D patent/FR813761A/fr not_active Expired
- 1936-11-19 GB GB31735/36A patent/GB466949A/en not_active Expired
Cited By (33)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2506164A (en) * | 1947-10-15 | 1950-05-02 | John E Morse | Method for the production of metallic printing members |
US2650901A (en) * | 1949-06-08 | 1953-09-01 | Horst Corp Of America V D | Electroplating on aluminum |
US2676916A (en) * | 1949-09-23 | 1954-04-27 | Aluminum Co Of America | Electroplating on aluminum |
US2654701A (en) * | 1950-06-08 | 1953-10-06 | Edwin R Calderon | Plating aluminum |
US2752302A (en) * | 1950-07-28 | 1956-06-26 | Warren Alloy | Process of treating aluminum work pieces |
US2662054A (en) * | 1950-09-08 | 1953-12-08 | United Chromium Inc | Method of electrodepositing chromium directly on aluminum |
US2650886A (en) * | 1951-01-19 | 1953-09-01 | Aluminum Co Of America | Procedure and bath for plating on aluminum |
US2745799A (en) * | 1951-03-16 | 1956-05-15 | Pechiney Prod Chimiques Sa | Processes for coating aluminum and alloys thereof |
US2891309A (en) * | 1956-12-17 | 1959-06-23 | American Leonic Mfg Company | Electroplating on aluminum wire |
US3075894A (en) * | 1959-01-23 | 1963-01-29 | Westinghouse Electric Corp | Method of electroplating on aluminum surfaces |
US3202529A (en) * | 1962-08-08 | 1965-08-24 | Sperry Rand Corp | Disposition of nickel-cobalt alloy on aluminum substrates |
US3505181A (en) * | 1963-05-29 | 1970-04-07 | Secr Defence Brit | Treatment of titanium surfaces |
US3455014A (en) * | 1968-01-11 | 1969-07-15 | M & T Chemicals Inc | Method of joining by plating aluminum and alloys thereof |
US3909209A (en) * | 1973-11-05 | 1975-09-30 | Gould Inc | Method of treating aluminum and aluminum alloys and article produced thereby |
US3920413A (en) * | 1974-04-05 | 1975-11-18 | Nasa | Panel for selectively absorbing solar thermal energy and the method of producing said panel |
US3989606A (en) * | 1975-09-26 | 1976-11-02 | Aluminum Company Of America | Metal plating on aluminum |
US4192722A (en) * | 1978-07-25 | 1980-03-11 | Reynolds Metals Company | Composition and method for stannate plating of large aluminum parts |
US5882802A (en) * | 1988-08-29 | 1999-03-16 | Ostolski; Marian J. | Noble metal coated, seeded bimetallic non-noble metal powders |
US6656606B1 (en) | 2000-08-17 | 2003-12-02 | The Westaim Corporation | Electroplated aluminum parts and process of production |
US6692630B2 (en) | 2000-08-17 | 2004-02-17 | The Westaim Corporation | Electroplated aluminum parts and process for production |
US6815086B2 (en) | 2001-11-21 | 2004-11-09 | Dana Canada Corporation | Methods for fluxless brazing |
US20030197050A1 (en) * | 2001-11-21 | 2003-10-23 | Graham Michael E. | Fluxless brazing method and compositions of layered material systems for brazing aluminum or dissimilar metals |
US20040035910A1 (en) * | 2001-11-21 | 2004-02-26 | Dockus Kostas F. | Low temperature fluxless brazing |
US20040038070A1 (en) * | 2001-11-21 | 2004-02-26 | Dockus Kostas F. | Fluxless brazing |
US20040035911A1 (en) * | 2001-11-21 | 2004-02-26 | Dockus Kostas F. | Fluxless brazing |
US20030155409A1 (en) * | 2001-11-21 | 2003-08-21 | Dockus Kostas F. | Fluxless brazing |
US6913184B2 (en) | 2001-11-21 | 2005-07-05 | Dana Canada Corporation | Alloy composition and method for low temperature fluxless brazing |
US6959853B2 (en) | 2001-11-21 | 2005-11-01 | Dana Canada Corporation | Fluxless brazing method and method for manufacturing layered material systems for fluxless brazing |
US20060027625A1 (en) * | 2001-11-21 | 2006-02-09 | Dana Canada Corporation | Products for use in low temperature fluxless brazing |
US7000823B2 (en) | 2001-11-21 | 2006-02-21 | Dana Canada Corporation | Fluxless brazing |
US20060102696A1 (en) * | 2001-11-21 | 2006-05-18 | Graham Michael E | Layered products for fluxless brazing of substrates |
US7451906B2 (en) | 2001-11-21 | 2008-11-18 | Dana Canada Corporation | Products for use in low temperature fluxless brazing |
US7735718B2 (en) | 2001-11-21 | 2010-06-15 | Dana Canada Corporation | Layered products for fluxless brazing of substrates |
Also Published As
Publication number | Publication date |
---|---|
DE663979C (de) | 1938-09-03 |
GB466949A (en) | 1937-06-08 |
FR813761A (fr) | 1937-06-08 |
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