DE1034945B - Smoothing agent and bath for electrolytic chrome plating from an aqueous hexavalent chromic acid solution - Google Patents
Smoothing agent and bath for electrolytic chrome plating from an aqueous hexavalent chromic acid solutionInfo
- Publication number
- DE1034945B DE1034945B DER18899A DER0018899A DE1034945B DE 1034945 B DE1034945 B DE 1034945B DE R18899 A DER18899 A DE R18899A DE R0018899 A DER0018899 A DE R0018899A DE 1034945 B DE1034945 B DE 1034945B
- Authority
- DE
- Germany
- Prior art keywords
- chromic acid
- smoothing agent
- bath
- acid solution
- chrome plating
- 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.)
- Pending
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
- C25D3/04—Electroplating: Baths therefor from solutions of chromium
- C25D3/10—Electroplating: Baths therefor from solutions of chromium characterised by the organic bath constituents used
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)
Description
Glättungsmittel und Bad zur elektrolytischen Verchromung aus einer wäßrigen sechswertigen Chromsäurelösung Die Erfindung liegt auf dem Gebiet der Glättungsmittel für Bäder zur elektrolytischen Verchromung aus einer wäßrigen sechswertigen Chromsäurelösung.Smoothing agent and bath for electrolytic chrome plating from one Aqueous Hexavalent Chromic Acid Solution The invention is in the field of smoothing agents for baths for electrolytic chrome plating from an aqueous hexavalent chromic acid solution.
Nach der Erfindung wird die Aufgabe gelöst, glatte Chromniederschläge zu erzielen und die Oberflächenspannung zu erniedrigen.According to the invention, the object is achieved, smooth chromium deposits to achieve and to lower the surface tension.
Nach der Erfindung sind aus den großen und allgemeinen Gruppen der früher bekanntgewordenen Verbindungen zwei spezielle Typen von Alkylsulfonatverbindungen ausgewählt worden, weil sie gegenüber den bekannten Verbindungen in elektrolytischen Chrombädern erheblich verbesserte Wirkungen ergeben.According to the invention are from the large and general groups of previously known compounds two special types of alkyl sulfonate compounds has been selected because they are compared to the known compounds in electrolytic Chrome baths give significantly improved effects.
Die Netzmittel dienen danach nicht nur zur Herstellung geeigneter Chromüberzüge, sondern erfüllen auch bevorzugt die Aufgabe, 1. das Anhaften des Chromsäureelektrolyten beim Herausnehmen der Ware zu verhindern; 2. technische Einrichtungen zur Absaugung der Chromsäurenebel teilweise überflüssig zu machen und 3. die Entgiftung der verschleppten Chromsäure zu erleichtern.The wetting agents are then not only used to produce suitable ones Chromium coatings, but also preferably fulfill the task of 1. Adhering the To prevent chromic acid electrolytes when removing the goods; 2. technical facilities to make the chromic acid mist partly superfluous and 3. the detoxification to facilitate the entrained chromic acid.
Es ist bekannt, daß Netzmittel auf Sulfonatbasis zur Erzielung besonders qualitativ hochwertiger Niederschläge verwendet werden. Über den Zweck der Reduzierung der Verschleppungsverluste, des Verzichts auf Absaugevorrichtung und der leichteren Entgiftung der Chromsäureabwässer wird in diesen Patenten nicht gesprochen. Zur technischen Lösung dieser Probleme eignen sich die Alkylsulfonatverbindungen nach der Erfindung.It is known that sulfonate-based wetting agents are particularly useful for achieving this high quality rainfall is used. About the purpose of reduction the drag-out losses, the abandonment of suction devices and the lighter ones Detoxification of chromic acid waste water is not mentioned in these patents. To the The alkyl sulfonate compounds are suitable for technical solutions to these problems the invention.
Es wurde von entscheidender Bedeutung für die Beständigkeit von Netzmitteln in Chromsäureelektrolyten erkannt, daß der Schwefel der Sulfogruppe direkt an den Kohlenstoff und nicht über den Sauerstoff als Ätherbrücke gebunden ist. Es ist auch bekannt, daß viele Typen von Arylsulfonaten nicht die Beständigkeit der Alkylsulfonate nach der Erfindung besitzen.It became of vital importance for the durability of wetting agents recognized in chromic acid electrolytes that the sulfur of the sulfo group directly to the Carbon and is not bound via the oxygen as an ether bridge. It is also It is known that many types of aryl sulfonates lack the stability of the alkyl sulfonates own according to the invention.
Die Lösung der Erfindung besteht aus einem sechswertigen Chromsäureelektrolyten mit einer oberflächenaktiven Alkylsulfonatverbindung der allgemeinen Formel mit einer oder mehreren Sulfogruppen als Glättungsmittel. Nach einer Verbesserung der Erfindung wird eine oberflächenaktive Alkylsulfonatverbindung des Typs mit einer oder zwei Sulfogruppen verwendet. Als vorteilhaft hat sich ein Chrombad unter Verwendung eines Glättungsmittels erwiesen, das 0,001 bis 10 g/1 Alkylsulfonat enthält.The solution of the invention consists of a hexavalent chromic acid electrolyte with a surface-active alkyl sulfonate compound of the general formula with one or more sulfo groups as a smoothing agent. According to an improvement of the invention there is provided an alkyl sulfonate surfactant compound of the type used with one or two sulfo groups. A chrome bath using a smoothing agent which contains 0.001 to 10 g / l of alkyl sulfonate has proven to be advantageous.
Bereits E. Müller und O. Rossow : »Verchromung aus Flußsäure enthaltenden Chromsäurelösungen< , Zeitschrift Elektroden, 38 (1932), S. 884, weisen darauf hin, daß Fluorionen enthaltende Chrombäder bei stärkeren Schichten eine Knollenbildung ergeben. Ähnliche Bemerkungen machten L. N. Golz und W. F. Warganow: »Kaltverchromung", Korr. u. Korr. Bekämpfung (russ.), 3 (1937), S.432.E. Müller and O. Rossow: “Chromium plating from hydrofluoric acid Chromic acid solutions <, magazine electrodes, 38 (1932), p. 884, refer to it indicate that chromium baths containing fluorine ions cause nodules to form in thicker layers result. L. N. Golz and W. F. Warganow made similar remarks: "Cold chrome plating", Corr. And Corr. Combat (Russian), 3 (1937), p.432.
Durch Zusatz von Netzmitteln nach der Erfindung werden jedoch in einem derartigen Elektrolyten vollkommen glatte Chromniederschläge auch bei stärksten Schichten erzielt. Während eine 240 p. starke Chromschicht aus Fluorionen enthaltenden Chromsäureelektrolyten ohne Netzmittelzusatz bedenklich gestört aufgebaut ist, zeigt eine unter gleichen Bedingungen erzielte Chromschicht aus demselben Elektrolyten, jedoch mit Netzmittelzusatz nach der Erfindung, eine glatte Oberfläche.By adding wetting agents according to the invention, however, are in one Such electrolytes completely smooth chromium deposits even with the strongest Layers achieved. While a 240 p. strong chromium layer containing fluorine ions Chromic acid electrolyte without the addition of a wetting agent is built up in a questionably disturbed manner, shows a chromium layer from the same electrolyte obtained under the same conditions, but with the addition of a wetting agent according to the invention, a smooth surface.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DER18899A DE1034945B (en) | 1956-05-15 | 1956-05-15 | Smoothing agent and bath for electrolytic chrome plating from an aqueous hexavalent chromic acid solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DER18899A DE1034945B (en) | 1956-05-15 | 1956-05-15 | Smoothing agent and bath for electrolytic chrome plating from an aqueous hexavalent chromic acid solution |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1034945B true DE1034945B (en) | 1958-07-24 |
Family
ID=7400312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DER18899A Pending DE1034945B (en) | 1956-05-15 | 1956-05-15 | Smoothing agent and bath for electrolytic chrome plating from an aqueous hexavalent chromic acid solution |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE1034945B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3402554A1 (en) * | 1984-01-26 | 1985-08-08 | LPW-Chemie GmbH, 4040 Neuss | DEPOSITION OF HARD CHROME ON A METAL ALLOY FROM AN AQUEOUS ELECTROLYTE CONTAINING CHROME ACID AND SULFURIC ACID |
| EP0196053A2 (en) * | 1985-03-26 | 1986-10-01 | M & T Chemicals, Inc. | Chromium plating process for producing non-iridescent, adherent, bright chromium deposits at high efficiencies and substantially free of cathodic low current density etching |
| WO2008028932A1 (en) * | 2006-09-05 | 2008-03-13 | Tib Chemicals Ag | Additive for chromic acid applications |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE132228C (en) * | ||||
| FR1097166A (en) * | 1953-08-13 | 1955-06-30 | Dehydag | Process for producing galvanic metallic coatings |
-
1956
- 1956-05-15 DE DER18899A patent/DE1034945B/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE132228C (en) * | ||||
| FR1097166A (en) * | 1953-08-13 | 1955-06-30 | Dehydag | Process for producing galvanic metallic coatings |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3402554A1 (en) * | 1984-01-26 | 1985-08-08 | LPW-Chemie GmbH, 4040 Neuss | DEPOSITION OF HARD CHROME ON A METAL ALLOY FROM AN AQUEOUS ELECTROLYTE CONTAINING CHROME ACID AND SULFURIC ACID |
| EP0196053A2 (en) * | 1985-03-26 | 1986-10-01 | M & T Chemicals, Inc. | Chromium plating process for producing non-iridescent, adherent, bright chromium deposits at high efficiencies and substantially free of cathodic low current density etching |
| EP0196053A3 (en) * | 1985-03-26 | 1987-03-25 | M & T Chemicals, Inc. | Chromium plating process for producing non-iridescent, adherent, bright chromium deposits at high efficiencies and substantially free of cathodic low current density etching |
| WO2008028932A1 (en) * | 2006-09-05 | 2008-03-13 | Tib Chemicals Ag | Additive for chromic acid applications |
| DE102006042076A1 (en) * | 2006-09-05 | 2008-03-20 | Goldschmidt Tib Gmbh | A new additive for chromium electrolytes |
| EA016032B1 (en) * | 2006-09-05 | 2012-01-30 | Тиб Кемикалз Аг | Additive for chromic electrolytes |
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