DE1087872B - Process for the production of sliding phosphate layers on corrosion-resistant steels - Google Patents
Process for the production of sliding phosphate layers on corrosion-resistant steelsInfo
- Publication number
- DE1087872B DE1087872B DET11210A DET0011210A DE1087872B DE 1087872 B DE1087872 B DE 1087872B DE T11210 A DET11210 A DE T11210A DE T0011210 A DET0011210 A DE T0011210A DE 1087872 B DE1087872 B DE 1087872B
- Authority
- DE
- Germany
- Prior art keywords
- sliding
- corrosion
- phosphate layers
- production
- resistant steels
- 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
- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/78—Pretreatment of the material to be coated
Description
Verfahren zur Herstellung von Gleitphosphatschichten auf korrosionsbeständigen Stählen Die Herstellung von gut haftenden Gleitphosphatschichten auf korrosionsbeständigen Edelstählen ist schwierig, da die Angriffsfreudigkeit der Phosphorsäure derartigen Stählen gegenüber gering ist. Man bat aus diesem Grunde bereits vorgeschlagen, die Angriffsfreudigkeit der Phosphorsäure durch Zugabe einer Oxalsäure enthaltenden Phosphatisierlösung zu erhöhen. Dieser Vorschlag hat jedoch zu keinen befriedigenden Ergebnissen geführt.Process for the production of sliding phosphate layers on corrosion-resistant Steels The production of well-adhering sliding phosphate layers on corrosion-resistant Stainless steels are difficult because of the aggressiveness of phosphoric acid Is low compared to steels. For this reason it has already been suggested that the Aggressiveness of phosphoric acid due to the addition of an oxalic acid Increase phosphating solution. However, this suggestion has not yielded any satisfactory results Results.
Erfindungsgemäß wurde nun gefunden, daß Gleitphosphatschichten von hervorragender Dichtigkeit, Schlagfestigkeit und gleichmäßiger Dicke auf korrosionsbeständigen Stählen erzielt werden, wenn man die Stähle zunächst mit einem Eisenüberzug versieht und die Gleitphosphatschichten auf diese vorher erzeugte Eisenschicht aufbringt. Vor Aufbringen der Eisenschicht empfiehlt es sich, die Stähle noch mit einer Kupferauflage zu versehen. Durch Unterkupferung der Eisenschicht wird die Haftfähigkeit der Eisenphosphatschichten erhöht, und es können hierdurch Gleitphosphatschichten von einer Haftfähigkeit erzielt werden, wie sie bisher noch nicht erreicht werden konnte.According to the invention it has now been found that sliding phosphate layers of excellent tightness, impact resistance and uniform thickness on corrosion-resistant Steels can be achieved if the steels are first provided with an iron coating and applying the sliding phosphate layers to this previously produced iron layer. Before applying the iron layer, it is advisable to coat the steels with a copper layer to provide. Copper plating under the iron layer increases the adhesion of the iron phosphate layers increased, and sliding phosphate layers of adhesiveness can thereby be achieved in a way that has not yet been achieved.
In Ausführung des Verfahrens gemäß Erfindung wurde beispielsweise wie folgt verfahren.In carrying out the method according to the invention, for example proceed as follows.
Zum Zwecke der Phosphatierung der Schäfte von Ventilkegeln wurden die zu phosphatierenden Stücke zunächst in einer Salpetersäure-Salzsäure-Lösung behandelt und danach in fließendem Wasser gespült. Hierauf wurden die Stücke bei 6 V in einer Cuprodekapier-Lösung elektrolytisch verkupfert. Danach wurden sie erneut in fließendem Wasser gespült und anschließend in einer Ferroammonsulfat-Lösung bei einer Spannung von 1 V und einer Stromdichte von rund 1,5 Amp/dm2 elektrolytisch mit einem Eisenüberzug versehen. Die so vorbereiteten Stücke wurden sodann der Phosphatierung unterworfen, die mit einer gewöhnlichen Phosphatierlösung ohne Verwendung irgendeines Edelstahlphosphatisierungsmittels durchgeführt wurde.For the purpose of phosphating the stems of valve cones were the pieces to be phosphated first in a nitric acid-hydrochloric acid solution treated and then rinsed in running water. Then the pieces were at 6 V electrolytically copper-plated in a cuprodecaper solution. After that, they became again rinsed in running water and then in a ferroammon sulfate solution a voltage of 1 V and a current density of around 1.5 Amp / dm2 electrolytically provided with an iron coating. The pieces so prepared were then phosphated subjected to that with an ordinary phosphating solution without using any Stainless steel phosphating agent was carried out.
Die Phosphatierung war nach außerordentlich kurzer Zeit - sie benötigte weniger als 1 Minute im Gegensatz zu 5 bis 10 Minuten bei bisheriger Arbeitsweise - beendet. . Das Kristallkorn der Gleitphosphatschicht zeigte die für derartige Schichten kennzeichnende Kristallstruktur und konnte je nach der Dicke der nach dem Verkupfern niedergeschlagenen Eisenschicht in beliebiger Weise verstärkt werden.The phosphating was after an extraordinarily short time - it was necessary less than 1 minute as opposed to 5 to 10 minutes in the previous way of working - completed. . The crystal grain of the sliding phosphate layer showed that for such Characteristic crystal structure and layers could vary depending on the thickness of the after the copper-plating deposited iron layer can be reinforced in any way.
Durch die Erfindung ist für die Technik die Möglichkeit gegeben, auch Edelstähle, die normalerweise schlechte Laufeigenschaften besitzen, für Maschinenteile zu verwenden, bei denen es vor allen Dingen auf eine Verminderung der gleitenden Reibung ankommt.The invention also gives the technology the opportunity Stainless steels, which normally have poor running properties, for machine parts to use where the main thing is to reduce the sliding Friction matters.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DET11210A DE1087872B (en) | 1955-07-29 | 1955-07-29 | Process for the production of sliding phosphate layers on corrosion-resistant steels |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DET11210A DE1087872B (en) | 1955-07-29 | 1955-07-29 | Process for the production of sliding phosphate layers on corrosion-resistant steels |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1087872B true DE1087872B (en) | 1960-08-25 |
Family
ID=7546640
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DET11210A Pending DE1087872B (en) | 1955-07-29 | 1955-07-29 | Process for the production of sliding phosphate layers on corrosion-resistant steels |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE1087872B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5655955A (en) * | 1993-07-30 | 1997-08-12 | Nagel Maschinen Und Werekzeugfabrik Gmbh | Method and tool for improving the structure of the inner faces of working chambers of machines and motors |
-
1955
- 1955-07-29 DE DET11210A patent/DE1087872B/en active Pending
Non-Patent Citations (1)
Title |
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None * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5655955A (en) * | 1993-07-30 | 1997-08-12 | Nagel Maschinen Und Werekzeugfabrik Gmbh | Method and tool for improving the structure of the inner faces of working chambers of machines and motors |
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