CH128746A - Process for coating metal objects with lead. - Google Patents
Process for coating metal objects with lead.Info
- Publication number
- CH128746A CH128746A CH128746TA CH128746A CH 128746 A CH128746 A CH 128746A CH 128746T A CH128746T A CH 128746TA CH 128746 A CH128746 A CH 128746A
- Authority
- CH
- Switzerland
- Prior art keywords
- lead
- phosphorus
- tin
- bath
- metal objects
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/10—Lead or alloys based thereon
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating With Molten Metal (AREA)
Description
Verfahren zum Überziehen von Notallgegenständen mit Blei. Beim Überziehen von Metallgegenständen mit Blei durch Eintauchen in geschmolzenes Blei wurden bisher Zinn-Verbindungen des .Phosphors von Zeit zu Zeit während des Überziehvorgangs dem geschmolzenen Metall bad zugesetzt, zu dem Zweck, das geschmol zene Blei an dem zu überziehenden Metall gut haftfähig züi machen, wobei der Anteil der Phosphor-Zinn-Verbindung nicht mehr als 3'/o betrug. Im Verlauf des Vorgangs verschwindet der Phosphor, während das Zinn in dem Bleibade zurückbleibt.
Infolgedessen häuft sich das Zinn in dem Bade an und der Anteil des Zinns wächst ständig. Ist nun auch die Gegenwart einer gewissen M, enge Zinn notwendig, um die Löslichkeit des Phos phors im Blei zu steigern, so ist doüh ein Zuviel schädlich.
Gegenstand der Erfindung ist ein neues Verfahren, bei dem unter Wahrung der Vor teile des Zinns doch dessen Anhäufung und die damit verknüpften Nachteile vermieden werden. In Ausführung des Verfahrens be reitet man<B>b '</B> eispielsweise zunächst ein Bad geschmolzenen Bleies und gibt ein wenig Zinn dazu, wofür sich etwa <B>3</B> % als ausrei- ebend erwiesen haben.
Dieses Zinn enthält keinen Phosphor, sondern wirkt nur derart auf das Blei ein, dass seine Lösefähigkeit für Phosphor wäehst. Dem so vorbereiteten ge schmolzenen Blei setzt man bei Beginn des Überziehens und von Zeit zu Zeit während des Überziehens ein wenig Phosphorblei zu, um es in denjenigen Zustand, in welchein es an dem zu überziehenden Metall gut haftet, zu bringen und es darin zu erhalten. Dabei ist dann Blei statt des Zinns der Träger, mit dem der Phosphor in das Bad gelangt, und die Menge des Phosphors in dem Phosphorblei ist ungefähr die gleiche, wie in dem bisher verwendeten Phosphorzinn.
Bei dem geschilderten Verfahren bedeutet die zeitweise Zufügung des Phosphors keine Erhöhung des Zinngehalts in dem Bade, und die Menge an Phosphorblei ist so gering, dass sie keine merkliche Erhöhung des Blei gehalts im Bade zur Folge hat. Es ist nur, da der Phosphor während des Überziehvor- gangs verschwindet, notwendig, von Zeit zu Zeit weitere sehr geringe Mengen von Phos- phorblei zuzuttigen, damit das geschmolzene Blei in jenem Zustand bleibt, in dem es gut an dem zu überziehenden Teil haftet.
Das zu überziehende Metall wird durch das so vorbereitete und haftfähig erhaltene geschmolzene Blei hindurchgeführt.
Method of coating emergency objects with lead. When coating metal objects with lead by immersion in molten lead, tin compounds of phosphorus were previously added to the molten metal bath from time to time during the coating process, for the purpose of making the molten lead readily adherent to the metal to be coated, the proportion of the phosphorus-tin compound being no more than 3%. As the process progresses, the phosphorus disappears while the tin remains in the lead bath.
As a result, the tin accumulates in the bath and the amount of tin increases steadily. If the presence of a certain amount of tin is necessary in order to increase the solubility of the phosphorus in the lead, then too much is harmful.
The invention relates to a new process in which, while maintaining the advantages of the tin, its accumulation and the associated disadvantages are avoided. In carrying out the process, for example, a bath of molten lead is first prepared and a little tin is added, for which about <B> 3 </B>% has proven to be sufficient.
This tin does not contain any phosphorus, but only affects the lead in such a way that its dissolving capacity for phosphorus increases. A little phosphorus lead is added to the molten lead prepared in this way at the beginning of the coating and from time to time during the coating in order to bring it into the state in which it adheres well to the metal to be coated and to keep it therein. In this case, instead of the tin, lead is the carrier with which the phosphorus enters the bath, and the amount of phosphorus in the phosphorus lead is approximately the same as in the phosphorus tin used previously.
In the method described, the temporary addition of phosphorus does not mean an increase in the tin content in the bath, and the amount of phosphorus lead is so small that it does not result in any noticeable increase in the lead content in the bath. Since the phosphorus disappears during the coating process, it is only necessary from time to time to add very small amounts of phosphorus lead so that the molten lead remains in the state in which it adheres well to the part to be coated.
The metal to be coated is passed through the thus prepared and adherent molten lead.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH128746T CH128746A (en) | 1926-12-08 | 1926-12-08 | Process for coating metal objects with lead. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH128746T CH128746A (en) | 1926-12-08 | 1926-12-08 | Process for coating metal objects with lead. |
Publications (1)
Publication Number | Publication Date |
---|---|
CH128746A true CH128746A (en) | 1928-11-16 |
Family
ID=4387195
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH128746T CH128746A (en) | 1926-12-08 | 1926-12-08 | Process for coating metal objects with lead. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH128746A (en) |
-
1926
- 1926-12-08 CH CH128746T patent/CH128746A/en unknown
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