DE1217738B - Process for cleaning objects made of iron, steel and zinc and for producing a protective layer adhering to them, and for cleaning objects made of aluminum - Google Patents

Process for cleaning objects made of iron, steel and zinc and for producing a protective layer adhering to them, and for cleaning objects made of aluminum

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Publication number
DE1217738B
DE1217738B DED21941A DED0021941A DE1217738B DE 1217738 B DE1217738 B DE 1217738B DE D21941 A DED21941 A DE D21941A DE D0021941 A DED0021941 A DE D0021941A DE 1217738 B DE1217738 B DE 1217738B
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DE
Germany
Prior art keywords
cleaning objects
solution
objects made
cleaning
zinc
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
Application number
DED21941A
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German (de)
Inventor
Josef Rothkegel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daimler Benz AG
Original Assignee
Daimler Benz AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Daimler Benz AG filed Critical Daimler Benz AG
Priority to DED21941A priority Critical patent/DE1217738B/en
Publication of DE1217738B publication Critical patent/DE1217738B/en
Pending legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C22/00Chemical 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
    • C23C22/05Chemical 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 using aqueous solutions
    • C23C22/06Chemical 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 using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/07Chemical 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 using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
    • C23C22/23Condensed phosphates

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  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Chemical Treatment Of Metals (AREA)

Description

Verfahren zum Reinigen vön Gegenständemaüs Eisen, Stahl und Zink und zum Erzeugen einer darauf haftenden Schutzschicht, sowie zum. Reinigen vön Gegenständen. aus Aluiiinitiiri Die Erfindung betrifft ein Verfahren zum Reinigen von Gegenständen aus Eisen, Stahl und Zink und zum Erzeugen einer darauf haftenden Schutzschicht mittels heißer, wäßriger Lösungen.Methods for cleaning objects from iron, steel and zinc and for creating a protective layer adhering to it, as well as for. Cleaning of objects. made of aluminum The invention relates to a method for cleaning objects made of iron, steel and zinc and for creating a protective layer adhering to it by means of hot, aqueous solutions.

Während man im allgemeinen vor der Behandlung von Metalloberflächen mit Phosphatlösungen die Reinigung der Oberfläche in einem besonderen Verfahrensschritt vornahm, ist auch bereits ein Verfahren bekannt, bei dem die Phosphatlösung so zusammengesetzt ist, daß man mit ihr alle Fremdstoffe Von der Metalloberfläche entfernen und sie für die Aufnahme von Anstrichen vorbereiten können soll. Das wesentliche Kennzeichen dieses bekannten Verfahrens besteht darin, mit Lösungen von sauren Alkaliphosphaten in einem eng begrenzten pH-Bereich von 5 bis 6 zu arbeiten. Diese der Reinigung und Passivierung dienenden Lösungen können weitere Bestandteile enthalten, beispielsweise Oxydationsmittel, worunter auch Natriumnitrit erwähnt ist, und oberflächenaktive Substanzen. Als Alkaliphosphate sind hierbei nur Orthophosphate beschrieben.While one generally before the treatment of metal surfaces cleaning the surface with phosphate solutions in a special process step undertook, a process is already known in which the phosphate solution is composed in this way is that you can use it to remove all foreign matter from the metal surface and remove it should be able to prepare for the reception of paintwork. The essential characteristic this known method consists in using solutions of acidic alkali phosphates to work in a narrowly limited pH range of 5 to 6. This of purification and passivation serving solutions can contain further components, for example Oxidizing agents, including sodium nitrite, and surface-active agents Substances. The only alkali phosphates described here are orthophosphates.

Bei diesem bekannten Verfahren erhält man zwar eine Entfettung und Passivierung, es ist jedoch bei ihm nicht möglich, auch andere Schmutzstoffe durch eine einfache Behandlung mit der Lösung zu entfernen, so daß die passivierte Oberfläche nach der Behandlung staubig aussieht, wenn solche Schmutzstoffe auf ihr vorhanden waren.In this known method, you get a degreasing and Passivation, however, does not allow other contaminants to pass through a simple treatment with the solution to remove so that the passivated surface looks dusty after treatment if such contaminants are present on it was.

Es wurde nun gefunden, daß dieser Nachteil behoben und eine einwandfreie Reinigung und Passivierung erhalten werden kann, wenn man die Oberfläche von Eisen, Stahl und Zink mit einer Lösung behandelt, die komplexbildende saure Alkalipyrophosphate, Alkalinitrit und nichtionogene, waschaktive Substanzen -enthält. Die waschaktive Substanz kann vorzugsweise aus niedrigäthoxyliertem Alkylphenylpolyglykoläther bestehen.It has now been found that this disadvantage has been remedied and a faultless one Purification and passivation can be obtained by removing the surface of iron, Steel and zinc treated with a solution containing complexing acidic alkali pyrophosphates, Alkali nitrite and non-ionic, detergent substances -contains. The washing active Substance can preferably consist of low-ethoxylated alkylphenyl polyglycol ether.

Das Zusammenwirken von sauren Alkalipyrophosphaten, Alkalinitrit und nichtionogenen, waschaktiven Substanzen ermöglicht eine hervorragende Reinigung, die die Ausbildung einer Oberflächenschicht begünstigt, welche sehr fest auf dem Gegenstand haftet und einen ausgezeichneten Haftgrund für weitere Überzüge mit Lack oder Farbe darstellt. Im Vergleich zu dem bekannten Verfahren, das mit Alkaliorthophosphatlösungen sowohl reinigt als auch eine Schutzschicht aufbringt, ist die Reinigungswirkung bei dem erfindungsgemäßen Verfahren wesentlich besser, da die erfindungsgemäß anzuwendenden Alkalipyrophosphatlösungen nicht nur Fette und Öle, sondern auch Feststoffverunreinigungen, wie sie in der Technik nicht vermeidbar sind, entfernen. Die Lösungen werden vorzugsweise bei erhöhter Temperatur angewendet, insbesondere bei 50 bis 65'C. Die Bäder arbeiten praktisch schlammfrei, was auch einen Vorteil darstellt und Ersparnisse durch Wegfall der Entschlammarbeiten ergibt. Außerdem weisen die erfindungsgemäß erzielten Schichten keine störende Saugfreudigkeit gegenüber Flüssigkeiten auf. Die niedrigen Anlage- und Betriebskosten stellen weitere Vorteile dar, da die gesamte Oberflächenbehandlung beispielsweise beim Farbspritzen in wenigen Etappen ihre Erledigung findet. Eine Kostenersparnis hinsichtlich der Anlage bedeutet weiterhin der Wegfall einer säurefesten Auskleidung der Behälter. Damit ergeben schon die Betriebsersparnisse, abgesehen von der Güte der Reinigung und der Dauerhaftigkeit der Oberflächenüberzüge, erhebliche Vorteile.The interaction of acidic alkali pyrophosphates, alkali nitrite and non-ionic, washing-active substances enable excellent cleaning, which favors the formation of a surface layer that is very strong on the Object adheres and an excellent primer for further coatings with varnish or represents color. Compared to the known method, that with alkali orthophosphate solutions both cleans and applies a protective layer is the cleaning effect significantly better in the method according to the invention, since those to be used according to the invention Alkali pyrophosphate solutions not only fats and oils, but also solid impurities, as they are unavoidable in technology, remove. The solutions are preferred applied at elevated temperature, especially at 50 to 65'C. The bathrooms are working practically sludge-free, which is also an advantage and savings by eliminating it the desludging work results. In addition, the layers obtained according to the invention have no annoying tendency to suck on liquids. The low investment and operating costs are further advantages, as is the overall surface treatment For example, it can be done in just a few stages when spraying paint. One Cost savings in terms of the system also mean the elimination of an acid-proof Lining the container. That already results in the operating savings, apart from that the quality of the cleaning and the durability of the surface coatings Advantages.

Die bei dem erfindungsgemäßen Verfahren verwendeten Lösungen haben sich auch als ein vorzügliches Mittel zum Reinigen von Gegenständen aus Aluminium erwiesen, wodurch sich betriebliche Vereinfachungen und Kostenersparnisse erzielen lassen, da es möglich ist, das Verfahren auch auf Gegenstände anzuwenden, die neben Oberflächen aus Eisen, Stahl und/oder Zink Aluminiumoberflächen besitzen. Beispiel Ein Bad zur Reinigung sowie zum Oberflächenüberziehen von Werkstücken aus Eisen, Stahl oder Zink enthält eine wäßrige Lösung von 10,4 g saurem Natriumpyrophosphat je Liter Bad. Außerdem sind je Liter Bad beigegeben als Oxydans 1,95 g Natriumnitrit und als waschaktive Substanz 0,65 g äthoxylierter Allcylphenylpolyglykoläther. Die Badtemperatur wird auf 50 bis 65°C gehalten. Die Badlösungen werden 1 bis 3 Minuten lang auf die zü behandelnden Gegenstände in bekannter Weise aufgespritzt. Die gründliche Reinigung der Oberflächen der Gegenstände wird dabei durch den emulgierend und netzend wirkenden waschaktiven Bestandteil der Lösung vollzogen, während die oxydierende Wirkung des Natriumnitrits die Bildung einer haftfesten Schutzschicht durch Phosphatierung fördert: Nach der Behandlung sind die bespritzten Gegenstände einwandfrei gleichmäßig mittels einer dünnen Schutzschicht passiviert, deren Dicke unter 1 #t liegt.Have the solutions used in the method of the invention It is also an excellent means of cleaning aluminum objects proven, which leads to operational simplifications and cost savings let, as it is possible to apply the procedure to objects that are in addition to Surfaces made of iron, steel and / or zinc have aluminum surfaces. example A bath for cleaning and surface coating of iron workpieces, Steel or zinc contains an aqueous solution of 10.4 g of acid sodium pyrophosphate per liter of bath. In addition, 1.95 g of sodium nitrite are added per liter of bath as an oxidant and as a washing substance 0.65 g of ethoxylated alkylphenyl polyglycol ether. the Bath temperature is kept at 50 to 65 ° C. The bathroom solutions are Sprayed on the objects to be treated in a known manner for 1 to 3 minutes. The thorough cleaning of the surfaces of the objects is done by the emulsifying and wetting active detergent component of the solution completed while the the oxidizing effect of sodium nitrite results in the formation of an adhesive protective layer promoted by phosphating: After the treatment, the sprayed objects are perfectly evenly passivated by means of a thin protective layer, the thickness of which is below 1 #t.

Claims (5)

Patentansprüche:- _ 1. Verfahren zum Reinigen von Gegenständen aus Eisen, Stahl und Zink und zum Erzeugen einer darauf haftenden Schutzschicht gleichzeitig mittels ein und derselben heißen wäßrigen Lösung, die ein Phosphat der -Alkalien, Älkalinitrit 'und oberflächenaktive Substanzen enthält, d a d u r c h gekennzeichnet, daß die Werkstücke mit einer Lösung behandelt werden, welche komplexbildende saure Alkalipyrophosphate, Alkalinitrit und nichtionogene waschaktive Substanzen enthält. Claims: - _ 1. Method for cleaning objects from Iron, steel and zinc and to create a protective layer adhering to it at the same time by means of one and the same hot aqueous solution, which is a phosphate of the alkalis, Contains alkali nitrite and surface-active substances, which are indicated by that the workpieces are treated with a solution which complex-forming acidic Contains alkali pyrophosphates, alkali nitrite and non-ionic detergent substances. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß als-nichtionogene waschaktive Substanz ein niedrigäthoxylierter Alkylphenylpoly= glykoläther verwendet wird. 2. The method according to claim 1, characterized in that as-nonionic detergents Substance a low ethoxylated alkylphenyl poly = glycol ether is used. 3. Verfahren nach den Ansprüchen 1 und 2, gezeichnet durch die Anwendung einer Lösung, welche auf 11 Badflüssigkeit enthält: 10,4 g saures Natriumpyrophosphat, 1,95 g Natriumnitrit, 0,65 g äthoxylierten Alkylphenylpolyglykoläther. 3. Method according to claims 1 and 2, drawn by the application of a solution, which for every 11 bath liquid contains: 10.4 g of acidic sodium pyrophosphate, 1.95 g Sodium nitrite, 0.65 g ethoxylated alkylphenyl polyglycol ether. 4. Verfahren nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß die zu behandelnden Gegenstände während einer Zeit von 1 bis 3 Minuten mit der auf einer Temperatur von 50 bis 65°C gehaltenen Lösung angespritzt werden. 4. Procedure according to Claim 1, 2 or 3, characterized in that the objects to be treated for a time of 1 to 3 minutes at a temperature of 50 to 65 ° C held solution can be injected. 5. Verwendung des Verfahrens nach Ansprüchen 1 bis 4 zum Reinigen von Aluminium. . In Betracht gezogene Druckschriften: Deutsche Patentschriften Nr. 753 058, 944 811; französische Patentschriften Nr. 833 784, 945 538, 1154 906; britische Patentschrift Nr. 517 049; USA.-Patentschrift Nr. 2 516 685; Chemisches Zentralblatt, 1937, 1I, S.4391/4392 (Referat der italienischen Patentschrift Nr: 346 095); »Metalloberfläche«, 1952, S. A 79/80, W. M a c h u, »Die Phosphatierung«, 1950, S.129/130.5. Use of the method according to claims 1 to 4 for cleaning aluminum. . Documents considered: German Patent Specifications No. 753 058, 944 811; French Patent Nos. 833 784, 945 538, 1154 906; British Patent No. 517,049; . USA. Patent No. 2,516,685; Chemisches Zentralblatt, 1937, 1I, p.4391 / 4392 (report of the Italian patent no: 346 095); "Metalloberfläche", 1952, P. A 79/80, W. Machu, "Die Phosphatierung", 1950, P. 129/130.
DED21941A 1955-12-17 1955-12-17 Process for cleaning objects made of iron, steel and zinc and for producing a protective layer adhering to them, and for cleaning objects made of aluminum Pending DE1217738B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DED21941A DE1217738B (en) 1955-12-17 1955-12-17 Process for cleaning objects made of iron, steel and zinc and for producing a protective layer adhering to them, and for cleaning objects made of aluminum

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED21941A DE1217738B (en) 1955-12-17 1955-12-17 Process for cleaning objects made of iron, steel and zinc and for producing a protective layer adhering to them, and for cleaning objects made of aluminum

Publications (1)

Publication Number Publication Date
DE1217738B true DE1217738B (en) 1966-05-26

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DED21941A Pending DE1217738B (en) 1955-12-17 1955-12-17 Process for cleaning objects made of iron, steel and zinc and for producing a protective layer adhering to them, and for cleaning objects made of aluminum

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR833784A (en) * 1938-02-15 1938-10-31 Improved process for treating the surface of iron or steel products in preparation for painting
GB517049A (en) * 1937-07-20 1940-01-18 Pyrene Co Ltd Improvements in or relating to improving the resistance of metals to corrosion
FR945538A (en) * 1946-04-26 1949-05-06 American Chem Paint Co Improvements to processes for cleaning and preparing metals so that they can receive coatings or coatings
US2516685A (en) * 1944-04-19 1950-07-25 American Chem Paint Co Process of preparing iron and aluminum surfaces to receive organic coatings and solution therefor
DE753058C (en) * 1934-03-03 1950-10-03 Henkel & Cie Gmbh Cleaning, washing, soaking, bleaching, rinsing or penetrating agents
DE944811C (en) * 1953-03-25 1956-06-21 Unilever Nv Detergents containing anti-tarnish agents
FR1154906A (en) * 1956-07-03 1958-04-18 Method and apparatus for cleaning and phosphating the surface of ferrous metal parts

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE753058C (en) * 1934-03-03 1950-10-03 Henkel & Cie Gmbh Cleaning, washing, soaking, bleaching, rinsing or penetrating agents
GB517049A (en) * 1937-07-20 1940-01-18 Pyrene Co Ltd Improvements in or relating to improving the resistance of metals to corrosion
FR833784A (en) * 1938-02-15 1938-10-31 Improved process for treating the surface of iron or steel products in preparation for painting
US2516685A (en) * 1944-04-19 1950-07-25 American Chem Paint Co Process of preparing iron and aluminum surfaces to receive organic coatings and solution therefor
FR945538A (en) * 1946-04-26 1949-05-06 American Chem Paint Co Improvements to processes for cleaning and preparing metals so that they can receive coatings or coatings
DE944811C (en) * 1953-03-25 1956-06-21 Unilever Nv Detergents containing anti-tarnish agents
FR1154906A (en) * 1956-07-03 1958-04-18 Method and apparatus for cleaning and phosphating the surface of ferrous metal parts

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