US2722508A - Electrodeposition of alloys containing copper and tin - Google Patents
Electrodeposition of alloys containing copper and tin Download PDFInfo
- Publication number
- US2722508A US2722508A US320617A US32061752A US2722508A US 2722508 A US2722508 A US 2722508A US 320617 A US320617 A US 320617A US 32061752 A US32061752 A US 32061752A US 2722508 A US2722508 A US 2722508A
- Authority
- US
- United States
- Prior art keywords
- copper
- tin
- alloy
- sodium
- aluminum
- 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
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
- C25D3/58—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of copper
Definitions
- the present invention relates to improvements in electroplating and is more particularly concerned with the electrodeposition of alloys containing copper and tin as the main constituents.
- the object of the present invention is to provide a process whereby an alloy containing copper and tin as the main constituents may be deposited on a cathode with no more difficulty than is encountered in the electrodeposition of nickel or pure copper with substantially the same equipment.
- the difficulties hitherto encountered in electro-depositing an alloy containing copper and tin as the main constituents, using anodes of the alloy in question are overcome by including in the aqueous electrolyte an organic hydroxy acid, preferably citric acid, or a suitable salt thereof.
- an organic hydroxy acid preferably citric acid, or a suitable salt thereof.
- the alloy anodes dissolve in the bath in a steady and regular manner without any tendency to polarization or other disturbances.
- the presence of citric acid or its compounds leads to a marked improvement in the appearance and texture of the deposited alloy.
- Example 1 Gm./1. Copper cyanide 40 Sodium stannate 20 Sodium cyanide (total) 65 Sodium hydroxide 7 /2 Sodium citrate 50 This gives a rather weak electrolyte and in circumstances in which the use of a more concentrated electrolyte is preferable, the following composition might be used:
- electrolyte compositions are as follows:
- Example 3 Preferred Percent- Concept Qon em e fi ion tration, Range, Range, g./1. percent g./l.
- Example 5 Preferred Percent- Concen- Concenage tration tration, Range, Range, g./l. percent g./l.
- copper sulphitel 50 7-50 20-80 sodium cyanide (total)... 50 7-50 20-80 sodium stannate 60 3-40 10-50 potassium hydroxide 50 10-40 20-100 citric acid 50 10-40 20-100 The various components may be added to the aqueous bath separately or they may be mixed in suitable proportions beforehand and subsequently dissolved in the appropriate amount of water.
- composition of the anodes which primarily controls the nature of the deposit, may be -95% copper and 520% tin and very good results have been obtained with copper and 10% tin. It has also been found advantageous to include a small proportion of aluminum or aluminum alloy, for instance up to 2.5% of aluminum or up to 3% of an alloy of aluminum and magnesium.
- a process for the electrodeposition of a copper-tin alloy selected from the group consisting of an alloy of copper and tin, an alloy of copper, tin and up to 2.5 aluminum, and an alloy of copper, tin and up to 3% of an aluminum'and magnesium alloy on a cathode comprising passing an electric current through an aqueous electrolyte composed of water, 5-25 of a copper compound, 10-50% of an alkali-metal stannate, 10-35% of an alkali-metal cyanide and 1050% of a compound having the citric acid radical selected from the group consisting of citric acid and an alkali-metal salt of citric acid,
- composition of the anode is 80-95% copper, 520% tin, 0-2.5% aluminum and 0-2% magnesium.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating And Plating Baths Therefor (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB307011X | 1951-11-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2722508A true US2722508A (en) | 1955-11-01 |
Family
ID=10311766
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US320617A Expired - Lifetime US2722508A (en) | 1951-11-27 | 1952-11-14 | Electrodeposition of alloys containing copper and tin |
Country Status (6)
Country | Link |
---|---|
US (1) | US2722508A (fr) |
BE (1) | BE515745A (fr) |
CH (1) | CH307011A (fr) |
DE (1) | DE1059737B (fr) |
FR (1) | FR1066712A (fr) |
GB (1) | GB732538A (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2244017B1 (fr) * | 1973-09-14 | 1977-09-23 | Stephanois Rech |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1073432A (en) * | 1912-10-29 | 1913-09-16 | Pascal Marino | Process of preparing electrolytes for use in the deposition of a metal or metallic alloy. |
US1863869A (en) * | 1929-10-07 | 1932-06-21 | Ternstedt Mfg Co | Electroplating bath |
US2198365A (en) * | 1938-06-29 | 1940-04-23 | Special Chemicals Corp | Electroplating |
US2397522A (en) * | 1939-10-25 | 1946-04-02 | City Auto Stamping Co | Process for the electrodeposition of tin alloys |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR863312A (fr) * | 1939-02-20 | 1941-03-29 | Procédé et appareil pour le dépôt électrolytique d'alliages d'étain | |
NL64052C (fr) * | 1942-09-15 |
-
0
- FR FR1066712D patent/FR1066712A/fr not_active Expired
- BE BE515745D patent/BE515745A/xx unknown
-
1951
- 1951-11-27 GB GB27824/51A patent/GB732538A/en not_active Expired
-
1952
- 1952-06-18 CH CH307011D patent/CH307011A/fr unknown
- 1952-06-19 DE DES28980A patent/DE1059737B/de active Pending
- 1952-11-14 US US320617A patent/US2722508A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1073432A (en) * | 1912-10-29 | 1913-09-16 | Pascal Marino | Process of preparing electrolytes for use in the deposition of a metal or metallic alloy. |
US1863869A (en) * | 1929-10-07 | 1932-06-21 | Ternstedt Mfg Co | Electroplating bath |
US2198365A (en) * | 1938-06-29 | 1940-04-23 | Special Chemicals Corp | Electroplating |
US2397522A (en) * | 1939-10-25 | 1946-04-02 | City Auto Stamping Co | Process for the electrodeposition of tin alloys |
Also Published As
Publication number | Publication date |
---|---|
CH307011A (fr) | 1955-05-15 |
DE1059737B (de) | 1959-06-18 |
BE515745A (fr) | |
FR1066712A (fr) | 1954-06-09 |
GB732538A (en) | 1955-06-29 |
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