DE1031080B - Process for the production of graphite-containing phosphate layers on gray cast iron surfaces by anodic treatment - Google Patents
Process for the production of graphite-containing phosphate layers on gray cast iron surfaces by anodic treatmentInfo
- Publication number
- DE1031080B DE1031080B DET11957A DET0011957A DE1031080B DE 1031080 B DE1031080 B DE 1031080B DE T11957 A DET11957 A DE T11957A DE T0011957 A DET0011957 A DE T0011957A DE 1031080 B DE1031080 B DE 1031080B
- Authority
- DE
- Germany
- Prior art keywords
- cast iron
- graphite
- production
- phosphate layers
- gray cast
- 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
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/36—Phosphatising
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Description
Verfahren zur Herstellung von graphithaltigen Phosphatschichten auf Graugußflächen durch anodische Behandlung Für das Phosphatieren von metallischen Gegenständen sind bereits eine Reihe von elektrolytischen Verfahren bekanntgeworden. Erfindungsgemäß werden abweichend von bekannten Verfahren die Phosphatierungsbäder bei Raumtemperatur und einer Spannung von mindestens 4 Volt durch anodische Schaltung des Gegenstandes betrieben.Process for the production of graphite-containing phosphate layers Gray cast iron surfaces through anodic treatment For the phosphating of metallic ones A number of electrolytic processes have already become known to objects. According to the invention, the phosphating baths are different from known processes at room temperature and a voltage of at least 4 volts through anodic switching of the object operated.
Von einer derartigen Möglichkeit wurde bisher noch kein Gebrauch gemacht, obwohl ein solches Verfahren besonders geeignet ist, an Stelle heißer auch kalte Phosphatierungsbäder verwenden zu können. Zur Schonung der Phosphatierungsgefäße sind schon Wege und Mittel, die Temperatur der Phosphatierungsbäder herabzusetzen, vorgeschlagen worden, jedoch sind bisher bei Verwendung von Phosphatierungsbädern niedriger Temperatur nur sehr dünne Phosphatschichten von etwa 2 bis 4 R. erhalten worden. Diese Schwierigkeit, die Temperatur eines Phosphatierungsbades zu senken und trotzdem auch starke Phosphatschichten von 8 #x Stärke und mehr zu erreichen. ist durch Anwendung des erfindungsgemäßen Verfahrens gewährleistet. Mit den bereits vorgeschlagenen Beizbehandlungen sind die Vorteile gemäß der Erfindung nicht zu erreichen.Such a possibility has not yet been used, although such a method is particularly suitable, cold instead of hot To be able to use phosphating baths. To protect the phosphating vessels are already ways and means of lowering the temperature of the phosphating baths, have been proposed, but have hitherto been using phosphating baths low temperature only very thin phosphate layers of about 2 to 4 R. been. This difficulty in lowering the temperature of a phosphating bath and still achieve strong phosphate layers of 8 #x thickness and more. is ensured by using the method according to the invention. With the already proposed pickling treatments are not the advantages according to the invention reach.
Die neue Phosphatierung erbringt ferner eine wesentliche Verbesserung der Feinkörnigkeit der niedergeschlagenen Phosphatschichten, deren Kristalle durch die Wahl der Spannung des elektrischen Stromes im Verein mit dem jeweils benutzten Elektrolyt in ihrer Ausbildungsart und Wachstumsgeschwindigkeit stark beeinflußt werden können. Insbesondere entsteht hierdurch bei den Phosphatschichten auf Gußeisen eine sehr vorteilhafte Qualitätsverbesserung, die dadurch nachgewiesen wurde, daß diese Schichten abgekratzt und analysiert wurden. Hierbei wurde festgestellt, daß mittels des erfindungsgemäßen Verfahrens in die Phosphatschichten eine wesentlich größere Menge feinster Graphitteilchen eingebaut wird als früher, was vor allem dann von Vorteil ist, wenn derartige Oberflächenschichten wie bei Kolbenringen und Kaltverformungsprozessen besonders gute Gleiteigenschaften haben sollen, d. h. daß es ihre Aufgabe ist, verschleißmindernd und schmierend zu wirken.The new phosphating also brings about a significant improvement the fine grain of the deposited phosphate layers, their crystals through the choice of the voltage of the electric current in conjunction with the one used Electrolyte strongly influenced in its type of formation and growth rate can be. In particular, this results in the phosphate layers on cast iron a very beneficial quality improvement, which has been proven that these layers were scraped off and analyzed. It was found that by means of the method according to the invention in the phosphate layers an essential larger amount of the finest graphite particles is incorporated than before, which is above all It is then advantageous if such surface layers as in the case of piston rings and Cold forming processes should have particularly good sliding properties, d. H. that it is their job to reduce wear and tear and have a lubricating effect.
Als Beispiel für die Ausführung des obengenannten neuen Verfahrens wird die Phosphatierung von Kolbenringen genannt: In einer 0,6 normalen Phosphorsäurelösung wurden eine Reihe von Kolbenringen bei Raumtemperatur bei 1.2 Volt Spannung in einer Zeit von 10 Minuten phosphatiert. Die hierbei erhaltene Schichtdicke betrug 25 [ und die Phosphatschicht enthielt 46% Graphit.As an example of performing the above new method The phosphating of piston rings is called: In a 0.6 normal phosphoric acid solution were a series of piston rings at room temperature at 1.2 volts in one Phosphated time of 10 minutes. The layer thickness obtained in this way was 25 [ and the phosphate layer contained 46% graphite.
Durch Änderungen der obengenannten Versuchsbedingungen ändern sich mit diesen natürlich auch teilweise die Ergebnisse. Jedoch darf die anzuwendende Spannung eine Mindesthöhe von 4 Volt nicht unterschreiten.Changes to the above test conditions change with these, of course, also partially the results. However, the applicable The voltage should not fall below a minimum of 4 volts.
Claims (1)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DET11957A DE1031080B (en) | 1956-03-03 | 1956-03-03 | Process for the production of graphite-containing phosphate layers on gray cast iron surfaces by anodic treatment |
| CH354645D CH354645A (en) | 1956-03-03 | 1957-01-18 | Process for phosphating metallic objects |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DET11957A DE1031080B (en) | 1956-03-03 | 1956-03-03 | Process for the production of graphite-containing phosphate layers on gray cast iron surfaces by anodic treatment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1031080B true DE1031080B (en) | 1958-05-29 |
Family
ID=7546873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DET11957A Pending DE1031080B (en) | 1956-03-03 | 1956-03-03 | Process for the production of graphite-containing phosphate layers on gray cast iron surfaces by anodic treatment |
Country Status (2)
| Country | Link |
|---|---|
| CH (1) | CH354645A (en) |
| DE (1) | DE1031080B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE814699C (en) * | 1948-06-29 | 1951-09-24 | George Michael | Process for making the running surfaces of cast iron engine cylinders, piston rings and other machine and transmission parts resistant to wear |
-
1956
- 1956-03-03 DE DET11957A patent/DE1031080B/en active Pending
-
1957
- 1957-01-18 CH CH354645D patent/CH354645A/en unknown
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE814699C (en) * | 1948-06-29 | 1951-09-24 | George Michael | Process for making the running surfaces of cast iron engine cylinders, piston rings and other machine and transmission parts resistant to wear |
Also Published As
| Publication number | Publication date |
|---|---|
| CH354645A (en) | 1961-05-31 |
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