DE742972C - Strongly acidic electrolyte to produce hard and shiny chrome layers - Google Patents

Strongly acidic electrolyte to produce hard and shiny chrome layers

Info

Publication number
DE742972C
DE742972C DET56411D DET0056411D DE742972C DE 742972 C DE742972 C DE 742972C DE T56411 D DET56411 D DE T56411D DE T0056411 D DET0056411 D DE T0056411D DE 742972 C DE742972 C DE 742972C
Authority
DE
Germany
Prior art keywords
strongly acidic
acidic electrolyte
electrolyte
chrome layers
produce hard
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
Application number
DET56411D
Other languages
German (de)
Inventor
Dr Nikolaj Trockij
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NIKOLAJ TROCKIJ DR
Original Assignee
NIKOLAJ TROCKIJ DR
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NIKOLAJ TROCKIJ DR filed Critical NIKOLAJ TROCKIJ DR
Priority to DET56411D priority Critical patent/DE742972C/en
Application granted granted Critical
Publication of DE742972C publication Critical patent/DE742972C/en
Expired legal-status Critical Current

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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
    • C25D3/04—Electroplating: Baths therefor from solutions of chromium

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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)
  • Colloid Chemistry (AREA)

Description

Stark saurer Elektrolyt zur Erzeugung harter und glänzender Chromschichten Die Frage der Zusätze zu solchen Elektrolyten, welche eine starke Säure in großes Konzentration enthalten, z. B. bei der Ver chromung zur Erzielung harter und glänzender Chromschichten, war fast bis zur letzten Zeit offen, da gewöhnlich die verwendeten organischen Kolloide während der Elektrolyse zerlegt werden und sogar verbrennen.Strongly acidic electrolyte to produce hard and shiny chrome layers The question of additives to such electrolytes, which a strong acid in large Contain concentration, e.g. B. in the United chrome plating to achieve harder and shinier Chromium layers, was open almost until recently, since they were usually used organic colloids are broken down and even burned during electrolysis.

Bei manchen Elektrolyten, welche starke Säure enthielten, hat sich das Kolloid von selbst gebildet durch Zerfall der bisweilen anwesenden chemischen Verbindungen, welche Silicium, z: B. Fiworsilicate, enthielten. In diesen Fällen scheiden sich die Hydrate Si02 in kolloidaler Form als Silicogel aus.With some electrolytes, which contained strong acid, has the colloid is formed by itself through the breakdown of the chemical that is sometimes present Compounds containing silicon, e.g., fibrous silicates. In these cases the hydrates Si02 are deposited in colloidal form as a silica gel.

In der letzten Zeit wurde empfohlen, dem fußsäurehaltigen Elektrolyten Kieselsäure zuzusetzen, sowohl unmittelbar wie auch in Form der Wasserglaslösung, welche unter der Wirkung des sauren Elektrolyten die kolloidale Kieselsäure ausscheidet. Aus der Praxis der Kolloidv erwendung bei Elektrolyten ist bekannt, daß die Wirkung der Kolloide auf die Eigenschaften des kathodisch geschalteten Metalls nicht nur von ihrer Menge, sondern auch hauptsächlich von ihrer chemischen Zusammensetzung und von dem Dispersionsgrade abhängig ist.Lately it has been recommended to use the electrolyte containing foot acid Add silica, both directly and in the form of the water glass solution, which under the action of the acidic electrolyte separates the colloidal silica. From the practice of colloid use in electrolytes it is known that the effect of the colloids not only on the properties of the cathodically connected metal on their quantity, but also mainly on their chemical composition and depends on the degree of dispersion.

Gegenstand der Erfindung ist ein stark saurer Elektrolyt zur Erzeugung harter und glänzender Chromschichten, welcher kleine Mengen verschiedener anorganischer chemischer Verbindungen in kolloidaler Form enthält. Als solche treten auf: Sn 02, Zr 02, Ti 02, W O,3, V205 sowie ihre Hydrate, wobei sie sich in reiner Form im. Elektrolyten befinden können, ebenso in Form von Mischungen untereinander sowie auch mit kolloidalem Si 02 gemischt.The subject of the invention is a strongly acidic electrolyte for producing hard and shiny chromium layers, which contains small amounts of various inorganic chemical compounds in colloidal form. As such occur: Sn 02, Zr 02, Ti 02, WO, 3, V205 and their hydrates, whereby they are in pure form in. Electrolytes can be located, also in the form of mixtures with one another and also mixed with colloidal Si 02.

Diese Stoffe können dem Elektrolyten in Form von Lösungen ihrer lösbaren Salze zugesetzt werden, wobei. diese unter der Wirkung der Säuren des Elektrolyten unter Ausscheidung der obenerwähnten chemischen Verbindungen in kolloidaler Form zerlegt werden.These substances can be dissolved in the electrolyte in the form of solutions Salts are added, with. these under the action of the acids of the electrolyte under elimination of the above-mentioned chemical compounds in colloidal form.

Als Beispiel kann die Lösung Na2Ti03 dienen, welche TiO2 ausscheidet, oder die Lösung Na2Sn03, welche Sn02 ausscheidet.The solution Na2Ti03, which precipitates TiO2, can serve as an example, or the solution Na2Sn03, which excretes Sn02.

Bei Abänderung der Konzentration der zugesetzten Lösungen und bei Änderungen der Bedienungen, unter denen die Zusetzung erfolgt, kann man die Größe der sich bildenden kolloidalen Teilchen verändern, z. B. bekommt man bei verdünnten Lösungen feinere Suspension usw., auch die Temperaturänderuilg wirkt in ähnlicher Weise.When changing the concentration of the added solutions and at Changes to the conditions under which the addition takes place can be made to the size of the colloidal particles forming, e.g. B. you get with diluted Solutions, finer suspensions, etc., the change in temperature also has a similar effect Way.

Mit anderen Worten, die Erfindung er laubt in solchem Maße den Prozeß zu beherrschen, daß alle wichtigsten Faktoren, von denen die Wirkung des Kolloids a1r hängig ist, wie a) seine chemische Zusammensetzung, b) seine Konzentration, c) die Größe der kolloidalen Teilchen, sich vollständig unter Kontrolle befinden.In other words, the invention, to such an extent, allows the process to master that all the main factors of which the action of the colloid a1r depends on how a) its chemical composition, b) its concentration, c) the size of the colloidal particles, are completely under control.

Die Härteprüfung der nach der Erfindung hergestellten Chromiiberzügeergab mit einer bleichzeitig sehr guten Haftung del-Niederschlages einen Wert von etwa 12o VH (Vickers Härte).The hardness test of the chrome coatings produced according to the invention showed with a very good adhesion of the precipitate at the same time, a value of about 12o VH (Vickers hardness).

Claims (2)

PATENTANSPRÜCHE: i. Stark saurer Elektrolyt zur Erzeugung harter und glänzender Chromschichten, dadurch gekennzeichnet, daß er ein oder mehrere fein disp#ergierte Kolloide von TiO2, Zr 02, Sn 02, WO" V2 05 oder deren Hydraten, gegebenenfalls mit Siliaoges gemischt, enthält. PATENT CLAIMS: i. Strongly acidic electrolyte for generating hard and shiny chrome layers, characterized in that it has one or more fine dispersed colloids of TiO2, Zr 02, Sn 02, WO "V2 05 or their hydrates, if appropriate mixed with Siliaoges, contains. 2. Verfahren zur Herstellung des Elektrolyten nach Anspruch i, dadurch gekennzeichnet, daß diese Kolloide in Form ihrer Salzlösungen dem Elektrolyten beigegeben werden. Zur Abgrenzung des Anmeldungsgegenstandes vom Stand der Technik ist im Erteilungsverfahren folgende Druckschrift in Betracht gezogen worden: deutsche Patentschrift ..... Nr. 635 700. 2. A method for producing the electrolyte according to claim i, characterized in that these colloids are added to the electrolyte in the form of their salt solutions. To distinguish the subject of the application from the state of the art, the following publication was considered in the granting procedure: German patent specification ..... No. 635 700.
DET56411D 1941-10-30 1941-10-30 Strongly acidic electrolyte to produce hard and shiny chrome layers Expired DE742972C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DET56411D DE742972C (en) 1941-10-30 1941-10-30 Strongly acidic electrolyte to produce hard and shiny chrome layers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET56411D DE742972C (en) 1941-10-30 1941-10-30 Strongly acidic electrolyte to produce hard and shiny chrome layers

Publications (1)

Publication Number Publication Date
DE742972C true DE742972C (en) 1943-12-15

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Family Applications (1)

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DET56411D Expired DE742972C (en) 1941-10-30 1941-10-30 Strongly acidic electrolyte to produce hard and shiny chrome layers

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DE (1) DE742972C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1002179B (en) * 1953-01-24 1957-02-07 Degussa Bath for the electrolytic deposition of metals from alkaline solutions
DE1168734B (en) * 1961-02-08 1964-04-23 Fritz Breit Bath for galvanic deposition of crack-free, hard chrome coatings

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE635700C (en) * 1933-08-15 1936-09-25 Int Latex Processes Ltd Process for improving the serial production of rubber articles of the same shape but different surface patterns

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE635700C (en) * 1933-08-15 1936-09-25 Int Latex Processes Ltd Process for improving the serial production of rubber articles of the same shape but different surface patterns

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1002179B (en) * 1953-01-24 1957-02-07 Degussa Bath for the electrolytic deposition of metals from alkaline solutions
DE1168734B (en) * 1961-02-08 1964-04-23 Fritz Breit Bath for galvanic deposition of crack-free, hard chrome coatings

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