EP0019897B1 - Verfahren zur Erzeugung von Konversionsschichten auf Metalloberflächen im Spritzverfahren - Google Patents

Verfahren zur Erzeugung von Konversionsschichten auf Metalloberflächen im Spritzverfahren Download PDF

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Publication number
EP0019897B1
EP0019897B1 EP80102932A EP80102932A EP0019897B1 EP 0019897 B1 EP0019897 B1 EP 0019897B1 EP 80102932 A EP80102932 A EP 80102932A EP 80102932 A EP80102932 A EP 80102932A EP 0019897 B1 EP0019897 B1 EP 0019897B1
Authority
EP
European Patent Office
Prior art keywords
solution
metal surface
spraying
sprayed
metal surfaces
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.)
Expired
Application number
EP80102932A
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German (de)
English (en)
French (fr)
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EP0019897A1 (de
Inventor
Wolfgang Konnert
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.)
Gerhard Collardin GmbH
Original Assignee
Gerhard Collardin GmbH
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Filing date
Publication date
Application filed by Gerhard Collardin GmbH filed Critical Gerhard Collardin GmbH
Priority to AT80102932T priority Critical patent/ATE3882T1/de
Publication of EP0019897A1 publication Critical patent/EP0019897A1/de
Application granted granted Critical
Publication of EP0019897B1 publication Critical patent/EP0019897B1/de
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    • 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
    • C23C22/73—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 characterised by the process
    • C23C22/76—Applying the liquid by spraying

Definitions

  • the invention relates to an improved method for producing conversion layers on continuously moving, strip-like or tabular metal surfaces made of aluminum, zinc or iron by applying a chromating solution or a chromic acid-free, fluoride and / or compounds of titanium, zirconium or manganese containing spray solutions.
  • British Patent GB-A-863 098 also describes a method for producing protective layers on metal surfaces by spraying on an aqueous solution, for example a chromating solution.
  • the solution is atomized using a propellant gas.
  • the metal surfaces have to be heated on the one hand before the treatment solution is applied and on the other hand must be completely free of adhering water.
  • the treatment solution is sprayed onto the stationary metal surface with moving application devices.
  • the object of the present invention is to provide a spraying method for producing conversion layers which allows the spraying treatment only on one side of the band-shaped or tabular metal surfaces.
  • the invention accordingly relates to a process for producing conversion layers on continuously moving, strip-like or tabular metal surfaces made of aluminum, zinc or iron by applying a chromating solution or a chromic acid-free, fluoride and / or compounds of titanium, zircon or manganese containing spraying process , wherein the solution is sprayed onto the cleaned and flushed metal surface with the aid of inert compressed gas through one or more two-component nozzles in which the solution and the pressurized gas are fed separately to the nozzle outlet opening, and the metal surface is then post-treated, which is characterized in that the Spray solution on only one side of the band or plate-shaped metal surface and at the same time supply compressed air to the other side.
  • the method according to the invention offers a significant advantage over the conventional spraying methods.
  • both sides - that is to say both the top and bottom - of the metal strip or sheet to be treated are usually sprayed with solution.
  • the method according to the invention enables the treatment of only one side - for example the top side - of the metal strip or sheet. Accordingly, in the sense of the method according to the invention, solution is sprayed onto only one side of the strip-like or tabular metal surface and compressed air is simultaneously supplied to the opposite side.
  • This simultaneous supply of compressed air causes the metal strips or sheets to pass through the treatment zone in a straight line - that is, sagging or bending is avoided - and on the other hand prevents the treatment solution from spreading undesirably from one side to the other.
  • the drying process can be initiated by supplying heated compressed air.
  • the new process can be used advantageously to produce conversion layers - which are often also referred to in the literature as conversion coatings - on aluminum, iron, steel, zinc or galvanized steel surfaces insert surfaces.
  • conversion coatings - on aluminum, iron, steel, zinc or galvanized steel surfaces insert surfaces can pass through the continuously operating systems in the form of «endless strips as well as in the form of sheets or plates.
  • the metal surfaces are subjected to cleaning or degreasing in a manner known per se and then rinsed thoroughly with water.
  • Alkaline baths based on sodium hydroxide solution which may additionally contain polyphosphates, complexing agents and wetting agents, are usually used for degreasing.
  • sodium hydroxide solution which may additionally contain polyphosphates, complexing agents and wetting agents, are usually used for degreasing.
  • multiple rinsing of the degreased metal surfaces is also appropriate, with service water being usually sprayed onto the metal surfaces with an overflow.
  • the conversion layers are produced by spraying on the respective treatment solutions in the manner according to the invention.
  • the chromating solutions known per se can be used, which usually contain, in addition to chromic acid or alkali chromates, phosphoric acid, nitric acid and / or hydrofluoric acid and optionally polyvalent metal ions, free or complex-bound fluorides and modifying additives.
  • chromic acid-free solutions based on, for example, phosphoric acid which also contain fluorides and / or compounds of titanium, zirconium and manganese and modifying additives, can also be used for the process according to the invention.
  • two-substance nozzles of known design can be used, in which solution and compressed gas are guided in separate channels up to the nozzle outlet opening, so that they only meet at the nozzle outlet opening.
  • Figure 1 shows the basic structure of such a two-component nozzle in cross-section.
  • 1 means the compressed gas supply or the compressed gas channel and 2 the supply for the treatment solution and the corresponding channel.
  • the solution can also be supplied via channel 1 and the compressed gas via channel 2.
  • all those materials from which the nozzles are also produced in conventional spraying systems for producing conversion layers, for example stainless steel are suitable as materials for such two-component nozzles.
  • the same also applies to the nozzle cross sections of the two-component nozzles to be used according to the invention; As a rule, nozzle cross sections in the range from 0.7 to 2.5 mm can be used.
  • Figure 2 shows a perspective view of the guidance of a metal strip 3, which passes through the treatment zone in the direction indicated by the arrows.
  • 4 mean a squeeze roller pair, 5 a height-adjustable support roller, 6 the two-substance nozzles arranged above and below the metal strip, 7 the storage container for the treatment solution and 8 the compressed gas supply.
  • FIG. 3 shows a cross section through the treatment zone; the numbers in this figure have the meaning given above.
  • the storage container for the treatment solution is expediently arranged over the treatment zone, as the illustrations show. No complex pressure and control pumps are required to fill this container; simple feed pumps, as are usually used for pumping aggressive liquids, are sufficient.
  • the number of two-substance nozzles arranged above and below the metal strip is ultimately determined by the width of the metal strip or sheet to be treated. In all cases, however, it must be ensured that every point on the metal surface passing the treatment zone "on the side to be sprayed" is hit by a spray jet of the treatment solution. In view of this and the different speeds at which the metal strips pass through the treatment zone, it can be advantageous to arrange several rows of nozzles one behind the other - possibly offset from one another. In general, the arrangement of the nozzles customary in conventional spraying systems can also be used for the process according to the invention.
  • any compressed and - with regard to the chemicals used and the metal surfaces to be processed - inert gas can be used as the compressed gas for carrying out the method according to the invention.
  • the treatment solutions are preferably sprayed with compressed air.
  • the compressed air used should preferably have a pressure of at least 0.1 bar, to ensure adequate spraying of the treatment solutions on the metal surface.
  • lower pressures also lead to satisfactory results with regard to the conversion layers produced.
  • the use of higher pressures is also possible within the scope of the method according to the invention, but generally does not lead to better results.
  • liquid quantities of 1 to 50 ml of treatment solution per square meter of metal surface are preferably sprayed on, the liquid quantity being controlled by a corresponding pressure regulation of the compressed air.
  • the method according to the invention also permits spraying of smaller or larger amounts of liquid.
  • the temperature of the treatment solution when spraying is usually in the room temperature range. If desired, however, the solutions can also have higher temperatures - for example in the range from 30 to 70 ° C.
  • the spraying of about 15 to 50 ml of treatment solution per square meter of metal surface requires an aftertreatment thereof in order to remove the portion of the solution which is not used for layer formation from the metal surface.
  • the metal strip After passing through the treatment zone, the metal strip first runs through a “reaction zone” within about 2 to 4 seconds, in which the sprayed-on treatment solution reacts with the metal surface to form the conversion layer or in which this reaction is completed.
  • the excess treatment solution is then removed by squeezing with rollers and / or - if necessary several times - rinsing with water, the last rinsing preferably being carried out with demineralized water.
  • rinsing with chromic acid solution can also be carried out in a manner known per se to passivate the metal surface. Following this, the metal surfaces are dried in the usual way.
  • the method according to the invention also enables the spraying of considerably smaller amounts of liquid. In this sense, spraying 3 to 7 ml of treatment solution per square meter of metal surface is particularly preferred.
  • the advantage of this preferred procedure can be seen in the fact that the sprayed-on solution is completely used up to produce the conversion layer, and it is therefore not necessary to remove excess treatment solution from the metal surface. In this way, there is no wastewater contaminated with the treatment solution that requires subsequent treatment.
  • the full use of the sprayed treatment solution for layer formation is of great interest with regard to the economy of the overall process.
  • the conversion layers obtained by the method according to the invention correspond in terms of layer thickness and quality to the layers resulting from conventional spraying methods.
  • the implementation of the method according to the invention is explained in more detail in the example below.
  • the strip material from the last rinsing zone is introduced into the following treatment zone after passing a free distance of approximately 0.8 m. This was equipped - both above and below the belt - with two nozzle strands arranged one behind the other, each with ten two-substance nozzles.
  • the top of the tape material was sprayed with an aqueous solution which contained and had a temperature of 40 ° C.
  • the bath was also made with deionized water.
  • the amount of liquid sprayed was 5 ml / m 2 at a pressure of 2 bar (compressed air).
  • compressed air only compressed air with the appropriate pressure was supplied to the underside of the strip material.
  • the strip material was introduced directly into a drying zone and dried using warm air.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Laminated Bodies (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Coating Apparatus (AREA)
  • Physical Vapour Deposition (AREA)
EP80102932A 1979-05-31 1980-05-27 Verfahren zur Erzeugung von Konversionsschichten auf Metalloberflächen im Spritzverfahren Expired EP0019897B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80102932T ATE3882T1 (de) 1979-05-31 1980-05-27 Verfahren zur erzeugung von konversionsschichten auf metalloberflaechen im spritzverfahren.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19792922115 DE2922115A1 (de) 1979-05-31 1979-05-31 Verfahren zur erzeugung von konversionsschichten auf metalloberflaechen im spritzverfahren
DE2922115 1979-05-31

Publications (2)

Publication Number Publication Date
EP0019897A1 EP0019897A1 (de) 1980-12-10
EP0019897B1 true EP0019897B1 (de) 1983-06-22

Family

ID=6072118

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80102932A Expired EP0019897B1 (de) 1979-05-31 1980-05-27 Verfahren zur Erzeugung von Konversionsschichten auf Metalloberflächen im Spritzverfahren

Country Status (7)

Country Link
US (1) US4326894A (enrdf_load_stackoverflow)
EP (1) EP0019897B1 (enrdf_load_stackoverflow)
JP (1) JPS55162370A (enrdf_load_stackoverflow)
AT (1) ATE3882T1 (enrdf_load_stackoverflow)
AU (1) AU5891680A (enrdf_load_stackoverflow)
BR (1) BR8003416A (enrdf_load_stackoverflow)
DE (2) DE2922115A1 (enrdf_load_stackoverflow)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5946159A (ja) * 1982-09-03 1984-03-15 Asahi Okuma Ind Co Ltd エアレススプレイ塗装方法及びエアレス塗装用スプレイガン
DE3334669A1 (de) * 1983-09-24 1985-04-11 Brown, Boveri & Cie Ag, 6800 Mannheim Verfahren zur herstellung einer elektrochemischen speicherzelle sowie einer danach hergestellten speicherzelle
US4686123A (en) * 1986-01-30 1987-08-11 Amoco Corporation Turbulent flow liquid application apparatus and a method of turbulently applying a liquid onto a substrate
DE8916223U1 (de) * 1989-05-24 1995-09-21 Dingler, Gerhard, 72221 Haiterbach Bauelement
US5380374A (en) * 1993-10-15 1995-01-10 Circle-Prosco, Inc. Conversion coatings for metal surfaces
US5441580A (en) * 1993-10-15 1995-08-15 Circle-Prosco, Inc. Hydrophilic coatings for aluminum
US6485580B1 (en) * 1998-05-20 2002-11-26 Henkel Corporation Composition and process for treating surfaces or light metals and their alloys
AU4308099A (en) * 1998-05-20 1999-12-06 Henkel Corporation Composition and process for treating surfaces of light metals and their alloys
US6860687B1 (en) * 1998-12-08 2005-03-01 Newfrey Llc Weldable aluminum stud
US6428851B1 (en) * 2000-03-01 2002-08-06 Bethlehem Steel Corporation Method for continuous thermal deposition of a coating on a substrate
DE10358590A1 (de) * 2003-12-12 2005-07-07 Newfrey Llc, Newark Verfahren zur Vorbehandlung von Oberflächen von Schweissteilen aus Aluminium oder seinen Legierungen und entsprechende Schweissteile
TWI606143B (zh) * 2017-06-30 2017-11-21 國防大學 化成皮膜及其製造方法
CN108914098A (zh) * 2018-08-15 2018-11-30 东莞市同盛电子科技有限公司 一种喷洒式表面处理线及其处理方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR881088A (fr) * 1941-05-06 1943-04-14 Collardin Gmbh Gerhard Procédé de traitement et de préférence de nettoyage des surfaces d'objets en métal par le procédé au pistolet
GB730469A (enrdf_load_stackoverflow) * 1952-12-30
DE1186303B (de) * 1956-06-15 1965-01-28 Amchem S A Verfahren zur Oberflaechenbehandlung von Metallen
GB863098A (en) * 1959-05-21 1961-03-15 Pyrene Co Ltd Improvements relating to the coating of metallic surfaces
JPS5215269A (en) * 1975-07-26 1977-02-04 Fuji Electric Co Ltd Method of manufacturing semiconductor pellets
JPS5240443A (en) * 1975-09-27 1977-03-29 Nippon Kokan Kk Process for applying chemical conversion bath on metal
JPS5760850Y2 (enrdf_load_stackoverflow) * 1976-02-17 1982-12-25
JPS5839792Y2 (ja) * 1977-04-21 1983-09-07 三菱化学株式会社 スプレ−ガン

Also Published As

Publication number Publication date
ATE3882T1 (de) 1983-07-15
US4326894A (en) 1982-04-27
BR8003416A (pt) 1981-01-05
AU5891680A (en) 1980-12-04
JPS55162370A (en) 1980-12-17
DE3063863D1 (en) 1983-07-28
EP0019897A1 (de) 1980-12-10
JPH026582B2 (enrdf_load_stackoverflow) 1990-02-09
DE2922115A1 (de) 1980-12-04

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