DE484977C - Process for the production of galvanic chrome-plating baths - Google Patents
Process for the production of galvanic chrome-plating bathsInfo
- Publication number
- DE484977C DE484977C DES82232D DES0082232D DE484977C DE 484977 C DE484977 C DE 484977C DE S82232 D DES82232 D DE S82232D DE S0082232 D DES0082232 D DE S0082232D DE 484977 C DE484977 C DE 484977C
- Authority
- DE
- Germany
- Prior art keywords
- chrome
- chromic acid
- solution
- production
- plating baths
- 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
Links
- 238000007747 plating Methods 0.000 title claims description 11
- 238000000034 method Methods 0.000 title claims description 6
- 238000004519 manufacturing process Methods 0.000 title claims description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 11
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 claims description 10
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 claims description 10
- 239000002253 acid Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims description 3
- 229910000423 chromium oxide Inorganic materials 0.000 claims description 3
- 239000003792 electrolyte Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 235000013601 eggs Nutrition 0.000 claims 1
- 239000000243 solution Substances 0.000 description 9
- 150000007513 acids Chemical class 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- ABXXWVKOBZHNNF-UHFFFAOYSA-N chromium(3+);dioxido(dioxo)chromium Chemical compound [Cr+3].[Cr+3].[O-][Cr]([O-])(=O)=O.[O-][Cr]([O-])(=O)=O.[O-][Cr]([O-])(=O)=O ABXXWVKOBZHNNF-UHFFFAOYSA-N 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
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
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)
- Chemical Treatment Of Metals (AREA)
Description
Verfahren zur Herstellung galvanischer Verchromungsbäder Es ist an sich bekannt, galvaxüsche Verchromungsbäder.anzuwenden., die Chromsäure und einen geringen Gehalt an Chromoxyd oder Chromichromatenthalten. Man kann zur Herstellung solcher Bäder von -einer wäßrigen Chromsäurelösung ausgehen, deren Gehalt an Fremdsäuren gewisse Grenzen nicht überschreiten darf. Eine derartige Lösung liefert indessen vielfach (noch kenne @einwandfreien Chromüberzüge. Es ist vielmehr in den meisten Fällen eine besondere Vorbehandlung erforderlich. Diese Vorbehandlung kann entweder auf elektrolytischem Wege erfolgen, beispielsweise durch Anwendung anormaler Badspannuingen, oder auch mittels chemischer Zusätze. Als solche kommen beispielsweise Reduktians- oder Oxydationsmittel sowie Fremdmetalle oder deren Salze in Betracht. Eine derartige Vorbehandlung von Verchromungsbädern, durch die eine gewisse Menge Chromi;chromat in der Lösung gebildet wird, ist nun im allgemeinen, insbesondere bei den verhältnismäßig großen Bädern, ziemlich umständlich durchzuführen.Process for making galvanic chrome plating baths It's on known to use galvanic chrome-plating baths., the chromic acid and a contain a low content of chromium oxide or chromium chromate. One can use to manufacture Such baths start from an aqueous chromic acid solution, the content of which is foreign acids may not exceed certain limits. Such a solution, however, provides in many cases (I still know @flawless chrome coatings. Rather, it is in most Special pretreatment is required in cases. This pretreatment can be either take place electrolytically, for example by using abnormal bath voltages, or by means of chemical additives. As such, for example, reductian or oxidizing agents as well as foreign metals or their salts. Such a one Pretreatment of chrome-plating baths, through which a certain amount of chromium; chromate is formed in the solution is now generally, especially in the proportionate large bathrooms, quite awkward to carry out.
Gemäß der Erfindung läßt sich die gleiche Aufgabe in wesentlich einfacherer Weise dadurch lösen, daß zu einer Lösung von Chromsäure, die den vorgeschriebenen Gehalt an fremdeln Säuren aufweist, eine verhältnismäßig sehr geringe Menge eines sölchen Elektrolyten zugesetzt wird, der .an sich einwandfreie Chromüberzüge liefert. Es hat sich überraschenderweisie gezeigt, daß der Zusatz nur etwa z % des Volumens der Chromsäurelösung zu betragen braucht, die zur Verchromung geeignet gemacht werden soll.According to the invention, the same task can be made much simpler Way to solve by that to a solution of chromic acid, which the prescribed Has content of foreign acids, a relatively very small amount of a when electrolytes are added, which in themselves deliver perfect chrome coatings. Surprisingly, it has been shown that the addition is only about z% of the volume the chromic acid solution needs to be made suitable for chrome plating target.
Man kann zur Ausführung .des neuen Verfahrens beispielsweise aus seinem bereits in Betrieb befindlichen Verchromungsbade eine geringe Menge desElektrolyten herausnehmen n und in einneu anzusetzendes Bad einbringen. Das letztere Bad liefert dann sofort einwandfreie Chrornübierzüge.One can, for example, from his Chrome-plating bath already in operation a small amount of the electrolyte take out and place in a new bath to be prepared. The latter bath supplies then immediately flawless chrome coating.
Steht kein bereits in Betrieb befindliches Verchromungsbad zur Verfügung, so kann man auch in folgender Weise das neue Verfahren durchführen. Man inimmt eine geringe Menge einer wäßrigen Lösung von Chromsäure mit -dem vorgeschriebenen Gehalt an fremden Säuren und behandelt diese Lösung mit einem chemischen Zusatz, beispielsweise mit sohwefel%-er Säure, oder auf elektrolytischem Wege, z.@B. mit anormalen.@Badspannungen, so lange, bis eine dunkle Färbung der Lösung eintritt. Hieran. ist zu erkennen, daß sich in dieser Lösung Chromichromat gebildet hat. Diese geringfügige Menge ist dann so. eingestellt, daß sie ein gutes Verchromungsbad liefert. Gießt man nun die so behandelte Chromsäurelösung in ein neu angesetztes, etwa hundertmal größeres Volumen aufweisendes Verchromungsbad, so liefert dieses überraschenderweise sogleich einwandfreie Chromüberzüge.If there is no chrome plating bath that is already in operation, the new method can also be carried out in the following way. You take one small amount of an aqueous solution of chromic acid with the prescribed content on foreign acids and treats this solution with a chemical additive, for example with sulfuric acid, or by electrolytic means, e.g. @ B. with abnormal. @ bath voltages, until the solution turns dark. Here. can be seen that this solution contains chromium chromate has formed. This minor Amount is like that then. adjusted to provide a good chrome plating bath. Pours the chromic acid solution treated in this way is now poured into a freshly prepared one about a hundred times Surprisingly, the chromium-plating bath having a larger volume provides this Immediately flawless chrome coatings.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP484977X | 1927-04-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE484977C true DE484977C (en) | 1929-10-24 |
Family
ID=12805002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DES82232D Expired DE484977C (en) | 1927-04-16 | 1927-10-18 | Process for the production of galvanic chrome-plating baths |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE484977C (en) |
-
1927
- 1927-10-18 DE DES82232D patent/DE484977C/en not_active Expired
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