CH231905A - Anode for hard chrome baths. - Google Patents
Anode for hard chrome baths.Info
- Publication number
- CH231905A CH231905A CH231905DA CH231905A CH 231905 A CH231905 A CH 231905A CH 231905D A CH231905D A CH 231905DA CH 231905 A CH231905 A CH 231905A
- Authority
- CH
- Switzerland
- Prior art keywords
- anode
- lead
- hard chrome
- baths
- chrome baths
- Prior art date
Links
Landscapes
- Electrolytic Production Of Metals (AREA)
Description
Anode für Hartehrombäder. Für Chrombäder sind bekanntlich Anoden aus reinem Weichblei erforderlich. Aus Weichblei hergestellte Anoden haben jedoch ,den Nachteil, :dass sie sich leicht deformieren, ausserdem gehört Weichblei zur Zeit zu den jenigen Metallen, -die nur sehr sparsam an gewendet werden dürfen.
Um einen gleich mässig starken und homogenen Chromüberzug zu erzielen, ist ein bestimmter und möglichst gleichbleibender Abstand der Anode vom Werkstück erforderlich. Verbiegt sich die Anode, so dass diese teilweise zu nah an das Werkstück gelangt, dann werden die Chrom kristalle an dieser Stelle rascher abgesetzt und bilden Verdickungsn, ja sogar Warzen, während bei zu brossem Anodenabstand :die niedergeschlagene Chromhaut zu :
dünn bleibt.
Vorliegende Erfindung bezweckt, mit einem Minimum von Weichblei eine Anode mit grosser Widerstandsfähigkeit gegen De formierung zu erzeugen. Die Erfindung be steht darin, dass die Anode aus einem minde stens an :den der Kathode gegenüberliegenden Stellen mit Blei überzogenen Körper, der aus einem andern Material als Blei hergestellt ist, besteht.
Anodenkörper aus Eisen oder einem andern leitenden Material können entweder ganz mit Blei überspritzt oder nur an :den der Kathode .gegenüberliegenden Stellen mit einer Bleihaut überzogen sein. Die übrigen Stellen des Anodenkörpers werden, zweck mässig mit einem Nichtleiter, Lack, Gummi oder dergleichen, ,der vom Elektrolyt nicht angegriffen wird, überzogen.
Ist der Anoden körper aus einem nichtleitenden Material her gestellt, beispielsweise Kunstharz, Holz, Glas, Ton etc., so muss von der Anodenstelle zum Stromanschluss eine leitende Verbindung hergestellt werden, was am einfachsten durch Aufspritzen einer Bleischicht erfolgt, deren Querschnitt so gross ist, dass eine störende Er wärmung des Bades durch die im Bleiüber zug entwickelte Stromwärme verhindert wird.
Die Bleihaut kann auch elektrolytisch aufgetragen werden, oder es können Blei- bleche aufgelötet werden. Derartige Anoden haben ferner den Vorteil, dass die Bleianoden, wenn diese nach einiger Zeit mit Chromchro- mat überzogen sind und dem Zweck nicht mehr dienen, abgeschmolzen oder abgetrennt und durch neue ersetzt -erden können.
Anode for hard chrome baths. It is known that anodes made of pure soft lead are required for chrome baths. However, anodes made from soft lead have the disadvantage: that they are easily deformed, and soft lead is currently one of those metals that can only be used very sparingly.
In order to achieve a uniformly thick and homogeneous chromium coating, a certain and as constant as possible distance between the anode and the workpiece is necessary. If the anode bends so that it sometimes comes too close to the workpiece, the chromium crystals are deposited more quickly at this point and form thickenings, even warts, while if the distance between the anode is too large: the deposited chromium skin to:
remains thin.
The present invention aims to produce an anode with a high resistance to deformation with a minimum of soft lead. The invention consists in the fact that the anode consists of a body which is coated with lead and which is made of a material other than lead, at least at the points opposite the cathode.
Anode bodies made of iron or some other conductive material can either be completely overmolded with lead or only covered with a lead membrane at the points opposite the cathode. The other points of the anode body are expediently coated with a non-conductor, paint, rubber or the like, which is not attacked by the electrolyte.
If the anode body is made of a non-conductive material, for example synthetic resin, wood, glass, clay, etc., a conductive connection must be made from the anode point to the power connection, which is most easily done by spraying on a lead layer with a cross-section so large that a disruptive warming of the bath by the current heat developed in the lead coating is prevented.
The lead skin can also be applied electrolytically, or lead sheets can be soldered on. Such anodes also have the advantage that the lead anodes, if they are coated with chrome chromate after some time and no longer serve the purpose, can be melted or separated and replaced with new ones.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH231905T | 1942-08-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH231905A true CH231905A (en) | 1944-04-30 |
Family
ID=4457327
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH231905D CH231905A (en) | 1942-08-08 | 1942-08-08 | Anode for hard chrome baths. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH231905A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0090435A1 (en) * | 1982-02-18 | 1983-10-05 | Eltech Systems Corporation | Electroplating method |
AT399166B (en) * | 1987-07-25 | 1995-03-27 | Technolizenz Ets | GALVANIC BATHS ANODE, AND METHOD FOR PRODUCING AND USING THIS ANODE |
-
1942
- 1942-08-08 CH CH231905D patent/CH231905A/en unknown
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0090435A1 (en) * | 1982-02-18 | 1983-10-05 | Eltech Systems Corporation | Electroplating method |
AT399166B (en) * | 1987-07-25 | 1995-03-27 | Technolizenz Ets | GALVANIC BATHS ANODE, AND METHOD FOR PRODUCING AND USING THIS ANODE |
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