EP0158287B1 - Verfahren zur Oberflächenbehandlung von Aluminium - Google Patents

Verfahren zur Oberflächenbehandlung von Aluminium Download PDF

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Publication number
EP0158287B1
EP0158287B1 EP85104110A EP85104110A EP0158287B1 EP 0158287 B1 EP0158287 B1 EP 0158287B1 EP 85104110 A EP85104110 A EP 85104110A EP 85104110 A EP85104110 A EP 85104110A EP 0158287 B1 EP0158287 B1 EP 0158287B1
Authority
EP
European Patent Office
Prior art keywords
aluminum
coating
iron
aluminum alloy
process according
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 - Lifetime
Application number
EP85104110A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0158287A2 (de
EP0158287A3 (en
Inventor
Atsunori C/O Nihon Parkerizing. Ltd Yoshida
Hideaki C/O Nihon Parkerizing. Ltd Kaneko
Takao C/O Nihon Parkerizing. Ltd Ogino
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.)
Nihon Parkerizing Co Ltd
Original Assignee
Nihon Parkerizing Co Ltd
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 Nihon Parkerizing Co Ltd filed Critical Nihon Parkerizing Co Ltd
Priority to AT85104110T priority Critical patent/ATE51039T1/de
Publication of EP0158287A2 publication Critical patent/EP0158287A2/de
Publication of EP0158287A3 publication Critical patent/EP0158287A3/de
Application granted granted Critical
Publication of EP0158287B1 publication Critical patent/EP0158287B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C23C22/05—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 using aqueous solutions
    • C23C22/68—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 using aqueous solutions using aqueous solutions with pH between 6 and 8
    • 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
    • C23C22/05—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 using aqueous solutions
    • C23C22/06—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 using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/34—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 using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/18—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2245/00—Coatings; Surface treatments
    • F28F2245/02—Coatings; Surface treatments hydrophilic

Definitions

  • the invention relates to a method for the surface treatment of aluminum or aluminum alloys by means of an aqueous treatment liquid containing hexafluorosilicate.
  • a special case of the surface treatment of aluminum or aluminum alloys is the treatment of fins on heat exchangers, especially air conditioning units.
  • Most heat exchangers are designed for the purpose of increasing the heat output or the cooling effect in such a way that the heat-emitting or cooling surfaces are as large as possible.
  • the distance between the individual slats is chosen to be extremely small. If the heat exchanger is used for cooling purposes, air moisture condenses on the surface of the heat exchanger, especially in the fins. The more hydrophobic the lamella surfaces are, the easier the condensed water forms water drops, which clog the lamella gaps, increase the resistance to air and thus reduce the heat exchange rate.
  • Another disadvantage is that the water droplets sticking in the lamellar gaps are blown into the air by the fan of the heat exchanger and are easily pressed out of the water collecting container attached at the bottom of the device. If necessary, the surroundings of the heat exchanger can be sprayed with water.
  • the silica particles or calcium carbonate particles are covered by the resin, so that the surface of the solid particles, which in themselves have hydrophilic properties, is shielded. A sufficiently hydrophilic layer cannot therefore be achieved.
  • the surface-active substance is easily washed off by water.
  • the methods according to 2. and 3. result in a hydrophilic coating, but have the disadvantage of poor adhesion and easy detachment.
  • the parts on the surface loosen easily and result in an easily swirlable powder.
  • they have the defect that the water glass, the lithium silicate, etc. is partially dissolved by the water condensed on a part of the heat exchanger, collects at the bottom of the fins, dries when the air conditioner is at a standstill and is whirled up as a powder when the device is restarted.
  • the object of the invention is to provide a process which avoids the disadvantages of the known processes, in particular those mentioned above, and with the aid of which it is possible to produce a uniform coating with good adhesive properties on surfaces of aluminum or aluminum alloys, which has a permanently hydrophilic property at a high surface Corrosion resistance imparted, and that works with a treatment liquid with increased service life.
  • US-A-1 710 743 discloses a treatment solution for producing colored coatings on workpieces consisting at least partially of aluminum, which contains a soluble fluorine compound and a salt of one of the metals silver, nickel, tin, cobalt, zinc, cadmium, iron, Contains manganese, lead, antimony copper.
  • the fluorine compound can be, for example, alkali fluorosilicate. The use of solutions that contain fluorosilicate and additional free fluoride is not mentioned.
  • concentrations of the active constituents are important insofar as, if the concentrations are too high, some of the components are only bound to the surface by adsorption and are therefore easy to wipe off. In addition, the process becomes uneconomical in terms of costs. If, on the other hand, the concentrations of the individual components are too low, the individual components dissolve easily in the treatment liquid, but the speed of the coating formation decreases and the adhesion of the coating formed decreases.
  • the coating formation is slow and thus the layer formation is time-consuming.
  • the iron ions are less than 0.05 g / l, the adhesion of the coating will decrease. In particular, it is then difficult to form a very good adhesion coating of more than 5 g / m 2 coating weight.
  • the components of the treatment liquid are normally added in the form of their soluble salts. They are present in the treatment liquid as salts or complex salts. Since some of these components have low solubility, the treatment liquids will generally be in the form of suspensions.
  • the zinc and iron components are most advantageously introduced via the fluorides, as a result of which the or some of the fluoride components are also introduced at the same time. If an iron trough is used as a container for the treatment liquid, a separate addition of iron salt may optionally be dispensed with, provided sufficient iron ions are supplied from the iron trough to the solution.
  • Sodium, potassium and lithium are generally used as the alkali metal.
  • Silicon and fluorine are the main components of the treatment liquid.
  • the fluorine ions etch the surface of the aluminum or aluminum alloy and accelerate the chemical reaction. They are also an integral part of the coating formed on contact with the treatment liquid. It generally contains 70% by weight Na 3 AlF 6 , 20% by weight Zn, 9% by weight Fe, balance Si.
  • the coating produced by the process according to the invention has a coating weight of generally 0.1-10 g / m2 .
  • oxidizing agents which should not be introduced into the treatment liquid, are, for example, nitrate, chlorate, bromate, nitrite and organic nitro compounds.
  • a temperature of the treatment liquid of 40-100 ° C and a treatment time of at least 5 s is recommended.
  • the concentration of hydrogen ions in the treatment liquid corresponding to a pH value of 4-5 is optimal.
  • the pH is adjusted with acidic fluorides, hydrofluoric acid or - if the active components introduced lead to an acidic dispersion or solution - with caustic soda.
  • the contact between the metal surface and the treatment liquid takes place in a conventional manner, e.g. by dipping, flooding, spraying or roller application.
  • the coating of hydrophilic property and good corrosion resistance obtained in this way can be subjected to an aftertreatment with a solution containing chromate or chromic acid. This in particular improves the corrosion resistance even further.
  • the coating produced by the method according to the invention has the advantage, among other things, that it offers little resistance to sliding friction. If a certain coating weight is set, it is suitable as a lubricating layer for the cold forming of aluminum products.
  • the lubricating layer for plastic deformation must have good adhesion. Otherwise, damage to the material or the finished product can easily occur. It can too Faults come from the fact that the material to be deformed gets caught in the deformation tools.
  • a coating weight of the lubricating layer for the plastic deformation or the cold deformation of 2-10 g / m 2 is required. To achieve even better lubrication performance, you can treat with lubricants such as metal soaps or lubricating oils.
  • the hydrophilic coating formed by the process according to the invention allows the condensed water to run off easily, so that the formation of water drops on the surface of the heat exchanger is made more difficult and the air resistance is reduced. This improves the heat exchange rate.
  • a suitable range of the coating weight is chosen, which will generally be less than in the case of an intended plastic deformation. If a rinsing with chromium VI-containing solutions is intended in accordance with a preferred embodiment of the invention, the digestible rinsing solutions can be used. This happens e.g. by immersion in a treatment solution with 5-0.001% by weight chromic acid or a spray treatment with such solutions. If necessary, a water rinse can follow.
  • the coating produced by the method according to the invention leads to dust nuisance when a heat exchanger is installed and in the initial phase of operation. Unlike conventional coatings, moisture and condensation do not affect the coating. An environmental impact both in the production area and during operation is prevented.
  • a treatment liquid was prepared so that the content was 6.8 g / 1 Na, 4.1 g / 1 Si, 17.1 g / 1 F, 0.77 g / 1 Zn and 0.5 g / 1 Fe at pH 4-5.
  • Degreased and cleaned aluminum material A 1100 was immersed in the treatment liquid placed in a stainless steel tub and heated to 60 ° C for 10 sec, 15 sec, 30 sec, 1 min, 3 min, 5 min and 7 min, then rinsed with water and dried after draining the water. A uniform ash-gray coating was created.
  • the contact angle of a drop of water on the surface of the coated aluminum material was measured with a goniometer.
  • corrosion resistance up to the formation of 5% "white rust” in hours according to salt water spray test JIS-Z-2371 and the adhesion of the coating were tested.
  • cellophane adhesive strips (Cellotape, Wz) were stuck on, then torn off and the percentage detachment of the coating determined. The results are shown in the table.
  • Aluminum material processed according to implementation examples 1-4 was immersed in a treatment solution with 1.5 g / l chromic acid (Parcolene 60 A from Nihon Parkerizing, Wz) at 50 ° C. bath temperature for 30 seconds after the coating had been formed. Then it was washed with water and dried after the water had run out. The same tests were carried out as in the aforementioned implementation examples. The test results are shown in the table.
  • 1.5 g / l chromic acid Parcolene 60 A from Nihon Parkerizing, Wz
  • the contact angle of a drop of water, the corrosion resistance and the coating adhesion were tested. The test results are shown in the table.
  • Aluminum material A 1100 was only cleaned and then used for the aforementioned tests Determination of contact angle, corrosion resistance and coating adhesion. The results are shown in the table.
  • a temperature of 60 ° C. previously degreased and cleaned aluminum material A 5052 was immersed for 1, 3 or 5 minutes under the conditions of implementation example 1, then rinsed with water and dried after the water had run off.
  • the result is coatings with a coating weight of approx. 2.5 g / m 2 , approx. 5 g / m 2 and approx. 6 g / m 2 , the adhesion of which was lower than when iron-containing treatment liquids were used. Removal of the coating occurred during deformation.

Landscapes

  • 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)
  • Chemical Treatment Of Metals (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • ing And Chemical Polishing (AREA)
  • Cookers (AREA)
  • Materials For Medical Uses (AREA)
  • Conductive Materials (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
EP85104110A 1984-04-10 1985-04-04 Verfahren zur Oberflächenbehandlung von Aluminium Expired - Lifetime EP0158287B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85104110T ATE51039T1 (de) 1984-04-10 1985-04-04 Verfahren zur oberflaechenbehandlung von aluminium.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP71334/84 1984-04-10
JP59071334A JPS60215772A (ja) 1984-04-10 1984-04-10 アルミニウムおよびその合金の表面処理方法

Publications (3)

Publication Number Publication Date
EP0158287A2 EP0158287A2 (de) 1985-10-16
EP0158287A3 EP0158287A3 (en) 1987-05-06
EP0158287B1 true EP0158287B1 (de) 1990-03-14

Family

ID=13457519

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85104110A Expired - Lifetime EP0158287B1 (de) 1984-04-10 1985-04-04 Verfahren zur Oberflächenbehandlung von Aluminium

Country Status (13)

Country Link
US (1) US4650525A (da)
EP (1) EP0158287B1 (da)
JP (1) JPS60215772A (da)
AT (1) ATE51039T1 (da)
AU (1) AU577580B2 (da)
BR (1) BR8501664A (da)
CA (1) CA1240454A (da)
DE (2) DE3512442A1 (da)
DK (1) DK163825C (da)
ES (1) ES8605869A1 (da)
GB (1) GB2157325B (da)
NZ (1) NZ211723A (da)
PT (1) PT80260B (da)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2541269B2 (ja) * 1987-08-27 1996-10-09 日本板硝子株式会社 酸化物薄膜の製造方法
DE69311802T2 (de) * 1992-04-01 1998-02-12 Henkel Corp., Plymouth Meeting, Pa. Verfahren zur metallbehandlung
US5281282A (en) * 1992-04-01 1994-01-25 Henkel Corporation Composition and process for treating metal
DE69426371T2 (de) * 1993-05-07 2001-05-17 Nippon Paint Co., Ltd. Wässrige Polyoxyalkylene Oberflachenbehandlungslösungen
US5391239A (en) * 1993-11-01 1995-02-21 Henkel Corporation Conversion coating of aluminum and its alloys and compositions and concentrates therefor
US5601695A (en) * 1995-06-07 1997-02-11 Atotech U.S.A., Inc. Etchant for aluminum alloys
DE19861003B4 (de) * 1997-10-31 2005-02-10 Suzuki Motor Corp., Hamamatsu Umwandlungsschicht auf hin- und hergehenden Teilen aus Aluminium oder Aluminiumlegierungen
CN100549231C (zh) * 1997-10-31 2009-10-14 铃木株式会社 滑动部件
JP3491811B2 (ja) 1997-10-31 2004-01-26 スズキ株式会社 摺動部材及びピストン
JP3404286B2 (ja) * 1998-04-16 2003-05-06 日本パーカライジング株式会社 金属の表面処理方法、および該表面処理方法により得られた表面を有する金属部材
US6569537B1 (en) * 1999-04-28 2003-05-27 Suzuki Motor Corporation Surface treatment method sliding member and piston
DE10017187B4 (de) * 2000-04-07 2012-12-13 Dechema Gesellschaft Für Chemische Technik Und Biotechnologie E.V. Verfahren zur Behandlung einer Legierung aus Aluminium und Titan zur Verbesserung der Oxidationsbeständigkeit dieser Legierungenen zwischen 800°C und 1000°C und Verwendung des Verfahrens
EP2367011A1 (en) 2010-03-17 2011-09-21 F. Hoffmann-La Roche AG Analyzer assembly platform
DE102010044806A1 (de) * 2010-09-09 2012-03-15 Dechema Gesellschaft Für Chemische Technik Und Biotechnologie E.V. Verfahren zur Behandlung der Oberflächen eines aus einer TiAl-Legierung bestehenden Substrats zur Verbesserung der Oxidationsbeständigkeit

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BE338925A (da) * 1926-02-10
US1710743A (en) * 1926-04-16 1929-04-30 Pacz Aladar Surface treating aluminum articles
US2213263A (en) * 1936-01-10 1940-09-03 Patents Corp Process of coating metals
BE511084A (da) * 1951-05-17
GB776954A (en) * 1954-03-19 1957-06-12 Degussa Process for the production of protective layers on surfaces of metals
US3592747A (en) * 1966-08-17 1971-07-13 Samuel L Cohn & Charles C Cohn Method of forming a decorative and protective coating on a surface
DE1933013C3 (de) * 1969-06-28 1978-09-21 Gerhard Collardin Gmbh, 5000 Koeln Verfahren zur Erzeugung von Schutzschichten auf Aluminium, Eisen und Zink mittels komplexe Fluoride enthaltender Lösungen
US3846182A (en) * 1973-07-05 1974-11-05 Ford Motor Co Method of forming a hydrophilic coating over an aluminum surface
JPS5722995B2 (da) * 1974-05-20 1982-05-15
DE2445622C3 (de) * 1974-09-25 1984-02-16 Kabel- und Metallwerke Gutehoffnungshütte AG, 3000 Hannover Anwendung eines Verfahrens zur Erzeugung von festhaltenden Überzügen auf umzuformenden Teilen aus Aluminium
CH606481A5 (da) * 1974-10-18 1978-10-31 Alusuisse
GB1502910A (en) * 1975-12-08 1978-03-08 Gutehoffnungshuette Ag Method of producing a lubricant carrier coating
US4145462A (en) * 1976-06-09 1979-03-20 Toyo Aluminium Kabushiki Kaisha Process for producing solar collectors
US4266988A (en) * 1980-03-25 1981-05-12 J. M. Eltzroth & Associates, Inc. Composition and process for inhibiting corrosion of ferrous or non-ferrous metal surfaced articles and providing receptive surface for synthetic resin coating compositions
AU551423B2 (en) * 1982-01-13 1986-05-01 Showa Aluminum Corp. Imparting hydrophilic properties to aluminium surfaces
JPS59229198A (ja) * 1983-06-09 1984-12-22 Nippon Parkerizing Co Ltd 熱交換器の表面処理法
JPS60101156A (ja) * 1983-11-07 1985-06-05 Sanyo Chem Ind Ltd アルミニウム製熱交換器またはそのフイン材用親水性皮膜形成剤

Also Published As

Publication number Publication date
DK162185A (da) 1985-10-11
GB2157325B (en) 1987-05-28
DE3576539D1 (de) 1990-04-19
JPS60215772A (ja) 1985-10-29
ATE51039T1 (de) 1990-03-15
GB8509179D0 (en) 1985-05-15
AU577580B2 (en) 1988-09-29
DK163825B (da) 1992-04-06
DK162185D0 (da) 1985-04-10
AU4096885A (en) 1985-10-17
EP0158287A2 (de) 1985-10-16
CA1240454A (en) 1988-08-16
PT80260B (de) 1987-03-16
ES542119A0 (es) 1986-04-01
GB2157325A (en) 1985-10-23
ES8605869A1 (es) 1986-04-01
DK163825C (da) 1992-09-07
PT80260A (de) 1985-05-01
NZ211723A (en) 1988-02-12
EP0158287A3 (en) 1987-05-06
US4650525A (en) 1987-03-17
DE3512442A1 (de) 1985-10-31
BR8501664A (pt) 1985-12-10

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