US1536859A - Electroplating - Google Patents
Electroplating Download PDFInfo
- Publication number
- US1536859A US1536859A US718079A US71807924A US1536859A US 1536859 A US1536859 A US 1536859A US 718079 A US718079 A US 718079A US 71807924 A US71807924 A US 71807924A US 1536859 A US1536859 A US 1536859A
- Authority
- US
- United States
- Prior art keywords
- cyanide
- cadmium
- metal
- electroplating
- addition
- 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
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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
Definitions
- Method ofobtaining bright, dense, coherent deposits of a metal upon another metal which comprises electrodepositing said first named metal from a cyanide solution thereof in the presence of a protein addition agent.
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- 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)
Description
Patented Ma 5, i925.
v UNITED STAT Es PATENT FW -If 2 run, 01' KOKOIQ, INDIANA,
A CORPORATION INDIANA.
.nr.ncraornnrme.
Ho Drawing.
To all concern:
Be it known that'I, CHAD H, Hmrrrmms,
' a citizen of the United States, residing at added to cyanide electroplatin Kokomo, in the county of Howard and State of Indiana, have invented certain new and useful Improvements in Electroplating, of which the following is a specification.
This invention relates to electroplating and more particularly to the use of certain addition or-rbrlghtening agents in the cyanide baths of various metals such; as cadmium, copper, silver, zinc and brass used for 'electroplatmg with these metals.-
I have found that protein substances when baths of metals give bright, dense, smoot adherent and continuous deposits. In my application Serial No. 540,566, filed March 2, 1922, I
proteins, and casein is a conjugated proteinibelonging to the phospho-protein family. 'Both belong to the sulpho-phospho grcu of proteins. They are readily soluble in a aline cyanide solutions, particularly when. such solutions contain some free so-. dium hydroxide and function as brightening agents in a ver satisfactory manner giving deposits sharpiy; diii'erent from those obtainable from t e'simple cyanide solutions not only in continuity andhardness, but also in appearance. Under'certain conditions it has been osslble to obta n cadmium depositsso ard that when a piece of steelcarrying the coatilg was flexed spangles of thecoating flew o According to the theory of action of ad:
dition agents given in] Applied Colloid- Chemistry by Bancroft, 1921, pages 165 and 231, some of the addition agent must be adsorbed by the precipitatin metal.- of course indicatesa loss o the addition agent from the plating bath which must be -made up by further additions thereto. If
This
Application med June's, 1924. Serial No. 718,079.
such adsorption does take place, it is very small or almost negligible, as I have found that extremely small quantities of the pro tein addition agents serve for a long period of time. Instances, are known in which commercial plating baths have been used for over a year without any replenishing the addition As stated, the quantity of the addition agent'required is very small. As little as gram of wool 01 gram of casein per gallon of electrolyte has been found to give satisfactory results. The quantity of addition agent preferably used ordinarily is greater than the minimum stated, however, and may vary under dilferent circumstances cm is. nmnnnrns, orxoxoxo, manure, nssrenon are norma rnoonss oorfrom say to ldgrams of wool, or to 2 grams of casein.
The following examples illustrate the invention;
(1) To each gallon of a sodium cadmium cyanide solution containing from A to 6 ounces of metallic cadmium and 2 to 6 ounces of free sodium cyanide per gallon there is added preferably about 1 grams of wool dissolved in a warm concentrated solution of caustic. soda.
' (2) Toeach gallon of a bath containing 1/; to 6 ounces of metallic cadmium and 2 to 6 ounces of sodium cyanide per gallon there is added preferably about 1 grams of casein dissolved in a warm dilute aqueous solution of ammonia. c
Examples might be multiplied in great numberusing different metals, difierent bath compositions and different addition agents, but the foregoing suficiently illustrate the invention.
' This application is a continuation in art of my appl cation Serial No. 540,566, ed
March 2, 1922, referred to above.
I claim:
1. Method ofobtaining bright, dense, coherent deposits of a metal upon another metal which comprises electrodepositing said first named metal from a cyanide solution thereof in the presence of a protein addition agent.
2. Method of obtaining bright, dense, 'coherent deposits of cadmium upon another metal which' comprises electrodepositing cadmium from a cyanide solution thereof in the presence of a rotein addition agent;-
3'. Method of o taining bright, dense, co-
herent deposits of a'metal upon another metal which comprises eleetrodepositin said first named metal from a cyanide so ution thereof to which has been added an alkaline solution of a protein as a brightening a%1ent. 4. Method as defined in claim 3 in w ich the brightening agent is an ammoniacal soaesaese the, brightening: lution of casein.
6. Method as defined in claim 3 in which the brightening agent is a protein of the sulpho-phospho group.
In testimony whereof, I afiix my signaagent is an ammonical soture. I L
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US718079A US1536859A (en) | 1924-06-05 | 1924-06-05 | Electroplating |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US718079A US1536859A (en) | 1924-06-05 | 1924-06-05 | Electroplating |
Publications (1)
Publication Number | Publication Date |
---|---|
US1536859A true US1536859A (en) | 1925-05-05 |
Family
ID=24884743
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US718079A Expired - Lifetime US1536859A (en) | 1924-06-05 | 1924-06-05 | Electroplating |
Country Status (1)
Country | Link |
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US (1) | US1536859A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2485563A (en) * | 1944-04-24 | 1949-10-25 | Poor & Co | Zinc electroplating compositions and method for the electrodeposition of zinc |
US2541700A (en) * | 1946-02-28 | 1951-02-13 | Du Pont | Electroplating copper |
US2658032A (en) * | 1949-06-11 | 1953-11-03 | City Auto Stamping Co | Electrodeposition of bright copper-tin alloy |
US2876178A (en) * | 1956-03-06 | 1959-03-03 | Ewald H Mccoy | Electrodepositing copper |
US3411996A (en) * | 1965-12-02 | 1968-11-19 | Du Pont | Process for brightening zinc and cadmium electroplate using an inner salt of a quaternized pyridine carboxylic acid and compositions containing the same |
-
1924
- 1924-06-05 US US718079A patent/US1536859A/en not_active Expired - Lifetime
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2485563A (en) * | 1944-04-24 | 1949-10-25 | Poor & Co | Zinc electroplating compositions and method for the electrodeposition of zinc |
US2541700A (en) * | 1946-02-28 | 1951-02-13 | Du Pont | Electroplating copper |
US2658032A (en) * | 1949-06-11 | 1953-11-03 | City Auto Stamping Co | Electrodeposition of bright copper-tin alloy |
US2876178A (en) * | 1956-03-06 | 1959-03-03 | Ewald H Mccoy | Electrodepositing copper |
US3411996A (en) * | 1965-12-02 | 1968-11-19 | Du Pont | Process for brightening zinc and cadmium electroplate using an inner salt of a quaternized pyridine carboxylic acid and compositions containing the same |
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