EP0128514A2 - Process for treating surfaces of heat exchangers - Google Patents
Process for treating surfaces of heat exchangers Download PDFInfo
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- EP0128514A2 EP0128514A2 EP84106430A EP84106430A EP0128514A2 EP 0128514 A2 EP0128514 A2 EP 0128514A2 EP 84106430 A EP84106430 A EP 84106430A EP 84106430 A EP84106430 A EP 84106430A EP 0128514 A2 EP0128514 A2 EP 0128514A2
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- dispersion
- aftertreatment
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- corrosion
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/10—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by other chemical means
- B05D3/107—Post-treatment of applied coatings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2202/00—Metallic substrate
- B05D2202/20—Metallic substrate based on light metals
- B05D2202/25—Metallic substrate based on light metals based on Al
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- 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 heat exchanger surfaces made of aluminum, which are provided with a corrosion-protective coating.
- 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 fin surfaces are, the easier the condensed water forms water drops that clog the fin gaps, increase the resistance to air and thus reduce the heat exchange rate.
- Another disadvantage is that the water droplets sticking in the lamellar columns from the fan of the heat exchanger into the air blow and be easily pushed out of the water collecting container in the bottom of the device. If necessary, the surroundings of the heat exchanger can be sprayed wet.
- the object of the present invention is to provide a method which imparts good hydrophilic properties to the aluminum surfaces of heat exchangers without the corrosion protection being impaired and without the disadvantages of the known methods being accepted.
- the object is achieved by designing the method of the type mentioned at the outset in accordance with the invention in such a way that the anti-corrosion coating is after-treated with a dispersion which contains fine alumina particles.
- the corrosion protective coating on the aluminum surface can be an anodized or boehmite layer, a chromate coating or the like.
- the base layer initially formed on the heat exchanger surfaces causes corrosion Stability achieved, which receives hydrophilic properties by forming a layer of fine alumina particles by applying an aqueous dispersion containing alumina fine particles.
- the known methods can be used for the corrosion-protective base layers applied within the invention.
- the fine alumina particles used in the process according to the invention should preferably have a particle size of 1 to 100 nanometers (10 m).
- the fine alumina particles adhere to the coating-treated surface and form such a bond that once applied fine alumina particles are practically no longer redispersible and therefore removable.
- the hydrophilic property hardly changes over time, so that a permanently hydrophilic surface is retained.
- a preferred embodiment of the invention consists in aftertreatment with a dispersion which additionally contains surfactant.
- Anionic, nonionic, and possibly also zwitterionic surfactants are particularly suitable. Their presence stabilizes the dispersion on the one hand and improves the wettability of the anti-corrosion coating on the other.
- Another advantageous embodiment of the invention provides for aftertreatment with a dispersion which additionally contains fine particles of silica or silicate.
- the particle size should be of the same order of magnitude as that for the alumina.
- the additional content of the components mentioned creates a layer on the coated surface with a structure close to the mullite (3 Al 2 O 3 2 Si0 2 ). This is special from the coated surface difficult to remove, hardly changes over time and creates a permanent hydrophilic surface.
- post-treatment can be carried out with an aqueous dispersion which contains tannin.
- an aqueous dispersion which contains tannin.
- This further improves the hydrophilic property of the coated surface.
- an aqueous dispersion is used which contains fine alumina particles, fine silica particles and tannin.
- the process according to the invention can also be designed in such a way that aftertreatment is carried out with a dispersion which contains water-soluble synthetic resin.
- the admixture of water-soluble synthetic resins elegantly permits the viscosity control of the aqueous dispersion and thus facilitates the regulation of the application quantity.
- the resin content should be comparatively small.
- the tannin possibly used in the invention means tannin or tannic acid, whereby hydrolyzable tannin or condensable tannin or precursors containing these forms partially dissolved can also be used, e.g. Depsid, Gallotannin, Chinese Tannin, Turkish Tannin, Hamamelitannin, Tannic Acid of Karako Maple, Chebulinic Acid, Sumachannin, Tannin from Japanese GallApple, Ellagic Acid Tannin, Catechin, Catechintannic Acid and Tannic Acid from Quebrana [Quebrachogerbic Acid].
- the layer weight produced with the method according to the invention should be approximately 0.01 to 5 g / m 2 (in the dried state). With less than 0.01 g / m 2 , a sufficiently hydrophilic surface can hardly be achieved. More than 5 g / m 2 reach the limit of economy. With an application amount of 0.1 to 1 g / m 2 you get one Contact angle when wetted with water of less than 30 °, which indicates an effectively hydrophilic property.
- the first batch was obtained by removing the degreased and rinsed sheets in an aqueous resin solution by reacting 220 g of ethylene-acrylic acid copolymer resin, 43 g of 28% ammonia water and 73.7 g of deionized water in a pressure vessel at a temperature of 130 ° C with stirring for about 1 hour, then cooling and diluting with 28% ammonia water to a solids content of 22% while simultaneously adjusting the pH to 9.5 + 0.5 and again diluting with deionized water to 10%. -% solids had been prepared, immersed at 20 ° C for 10 seconds. It was then squeezed off with a rubber roller, the moisture was removed while drying in a drying oven at 130 ° C. for 2 minutes and a corrosion-resistant surface layer of 1.2 g / m 2 was formed.
- the second batch was obtained by immersing degreased and cleaned aluminum panels in an acidic chromate solution at 50 ° C for 1 minute.
- a chromate coating was formed with a layer weight of approx. 80 mg / m (calculated as chromium). The sheets treated in this way were finally rinsed and dried.
- Dispersions were prepared for the aftertreatment of the aforementioned sheets.
- test panels were then subjected to a salt water spray test (according to JIS-Z-2371) to determine the corrosion resistance.
- the hydrophilic properties were assessed by measuring the contact angle. For this purpose, a small water drop of 1 to 2 mm in diameter standing on the surface was measured with the aid of a goniometric contact angle meter G-I for normal temperatures (manufactured by Elema Optics Co., Ltd.). The values after the immediate surface treatment (initially) and after immersion in running water for one week were measured (after 1 week).
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Abstract
Description
Die Erfindung betrifft ein Verfahren zur Oberflächenbehandlung von Wärmeaustauscheroberflächen aus Aluminium, die mit einem korrosionsschützenden Überzug versehen sind.The invention relates to a method for the surface treatment of heat exchanger surfaces made of aluminum, which are provided with a corrosion-protective coating.
Um Korrosion auf Aluminium-Wärmeaustauschern zu verhindern, ist es bekannt, diese einer Oberflächenbehandlung zu unterwerfen und Schutzschichten, z.B. durch anodische Oxydation (Eloxierung), Böhmit-Schicht-Bildung, Harz-Schicht-Bildung, zu erzeugen. Die derartig behandelten Oberflächen sind jedoch wenig hydrophil, eher hydrophob. Auch Chromatschichten sind nur in der Anfangszeit mehr oder minder hydrophil. Insbesondere infolge Trocknung neigen sie dazu, sich von einer hydrophilen zu einer hydrophoben Oberfläche zu verändern.In order to prevent corrosion on aluminum heat exchangers, it is known to subject them to surface treatment and to provide protective layers, e.g. by anodic oxidation (anodizing), boehmite layer formation, resin layer formation. However, the surfaces treated in this way are not very hydrophilic, but rather hydrophobic. Chromate layers are also only more or less hydrophilic in the beginning. In particular as a result of drying, they tend to change from a hydrophilic to a hydrophobic surface.
Andererseits sind die meisten Wärmeaustauscher zum Zwecke der Steigerung der Wärmeabgabe oder des Kühleffektes derart ausgelegt, daß die wärmeabgebenden oder kühlenden Flächen möglichst groß sind. Der Abstand zwischen den einzelnen Lamellen wird äußerst klein gewählt. Wird der Wärmeaustauscher zu Kühlzwecken verwendet, kondensiert Luftfeuchtigkeit auf der Oberfläche des Wärmeaustauschers, insbesondere in den Lamellenspalten. Je hydrophober die Lamellenoberflächen sind, desto leichter bildet das Kondenswasser Wassertropfen, die die Lamellenspalten verstopfen, den Durchtrittswiderstand für Luft erhöhen und damit die Wärmeaustauschrate senken. Ein weiterer Nachteil ist, daß die in den Lamellenspalten haftenden Wassertropfen vom Ventilator des Wärmeaustauschers in die Luft geblasen und leicht aus dem im Gerät unten angebrachten Wasserauffangbehälter herausgedrückt werden. Gegebenenfalls kann dadurch die Umgebung des Wärmeaustauschers naßgespritzt werden.On the other hand, 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 fin surfaces are, the easier the condensed water forms water drops that clog the fin gaps, increase the resistance to air and thus reduce the heat exchange rate. Another disadvantage is that the water droplets sticking in the lamellar columns from the fan of the heat exchanger into the air blow and be easily pushed out of the water collecting container in the bottom of the device. If necessary, the surroundings of the heat exchanger can be sprayed wet.
Auch bei Verwendung für Heizzwecke setzt sich im Winter an im Freien stehenden Geräten Reif-, Tau- und Nebelfeuchtigkeit an, welche die Heizwirkung verschlechtert. Von Zeit zu Zeit wird daher der Betrieb des Wärmeaustauschers umgekehrt, das im Freien stehende Gerät beheizt und die Feuchtigkeit beseitigt. Eine solche kurzzeitige und wirksame Beseitigung der Feuchtigkeit ist für die Funktion von kühlenden und heizenden Klimaanlagen unabdingbar.Even when used for heating purposes, frost, dew and fog moisture builds up on outdoor devices in winter, which worsens the heating effect. From time to time, therefore, the operation of the heat exchanger is reversed, the outdoor unit is heated and the moisture is removed. Such a short-term and effective removal of moisture is essential for the function of cooling and heating air conditioning systems.
Um die Feuchtigkeit rasch zu entfernen, ist es deshalb wirkungsvoll, die Lamellenoberflächen der kühlenden Teile des Wärmeaustauschers hydrophil zu gestalten. Gleichzeitig wird dadurch das Sickervermögen des Wassers gesteigert. Eine alleinige Behandlung zur Steigerung des Sickervermögens reicht jedoch im Hinblick auf den erforderlichen Korrosionsschutz nicht aus. Insbesondere bei Wärmeaustauscherflächen aus Aluminium ist eine Korrosionsschutzbehandlung erforderlich.In order to remove the moisture quickly, it is therefore effective to make the fin surfaces of the cooling parts of the heat exchanger hydrophilic. At the same time, the seepage capacity of the water is increased. A single treatment to increase the seepage capacity is not sufficient with regard to the required corrosion protection. Corrosion protection treatment is particularly necessary for heat exchanger surfaces made of aluminum.
Aufgabe der vorliegenden Erfindung ist es, ein Verfahren bereitzustellen, das den Aluminiumoberflächen von Wärmeaustauschern gute hydrophile Eigenschaft vermittelt, ohne daß der Korrosionsschutz verschlechtert wird und die Nachteile der bekannten Verfahren in Kauf genommen werden.The object of the present invention is to provide a method which imparts good hydrophilic properties to the aluminum surfaces of heat exchangers without the corrosion protection being impaired and without the disadvantages of the known methods being accepted.
Die Aufgabe wird gelöst, indem das Verfahren der eingangs genannten Art entsprechend der Erfindung derart ausgestaltet wird, daß man den korrosionsschützenden Überzug mit einer Dispersion, die Tonerde-Feinpartikel enthält, nachbehandelt. Der auf der Aluminiumoberfläche befindliche korrosionsschützende Überzug kann eine Eloxal- oder Böhmit-Schicht, ein ChromatÜberzug oder dergl. sein. Durch die zunächst auf den Wärmeaustauscheroberflächen gebildete Grundschicht wird Korrosionsbeständigkeit erzielt, die durch das Bilden einer Schicht von Tonerde-Feinpartikeln durch Auftrag einer wäßrigen, Tonerde-Feinpartikel enthaltenden Dispersion hydrophile Eigenschaften erhält.The object is achieved by designing the method of the type mentioned at the outset in accordance with the invention in such a way that the anti-corrosion coating is after-treated with a dispersion which contains fine alumina particles. The corrosion protective coating on the aluminum surface can be an anodized or boehmite layer, a chromate coating or the like. The base layer initially formed on the heat exchanger surfaces causes corrosion Stability achieved, which receives hydrophilic properties by forming a layer of fine alumina particles by applying an aqueous dispersion containing alumina fine particles.
Für die innerhalb der Erfindung aufgebrachten korrosionsschützenden Grundschichten können die bekannten Verfahren angewendet werden.The known methods can be used for the corrosion-protective base layers applied within the invention.
Die im erfindungsgemäßen Verfahren verwendeten Tonerde-Feinpartikel sollten vorzugsweise eine Teilchengröße von 1 bis 100 Nanometer (10 m) aufweisen.The fine alumina particles used in the process according to the invention should preferably have a particle size of 1 to 100 nanometers (10 m).
Aufgrund ihrer in wäßriger Phase positiven elektrischen Ladung haften die Tonerde-Feinpartikel auf der überzugsbehandelten Oberfläche und gehen eine derartige Bindung ein, daß einmal aufgebrachte Tonerde-Feinpartikel praktisch nicht mehr redispergierbar und damit ablösbar sind. Die hydrophile Eigenschaft verändert sich mit Zeitablauf kaum, so daß eine dauerhaft hydrophile Oberfläche erhalten bleibt.Because of their electrical charge, which is positive in the aqueous phase, the fine alumina particles adhere to the coating-treated surface and form such a bond that once applied fine alumina particles are practically no longer redispersible and therefore removable. The hydrophilic property hardly changes over time, so that a permanently hydrophilic surface is retained.
Eine bevorzugte Ausgestaltung der Erfindung besteht darin, mit einer Dispersion nachzubehandeln, die zusätzlich Tensid enthält. Besonders geeignet sind anionische, nichtionische, ggf. auch zwitterionische Tenside. Durch ihre Gegenwart wird einerseits die Dispersion stabilisiert und andererseits die Benetzbarkeit des korrosionsschützenden Überzuges verbessert.A preferred embodiment of the invention consists in aftertreatment with a dispersion which additionally contains surfactant. Anionic, nonionic, and possibly also zwitterionic surfactants are particularly suitable. Their presence stabilizes the dispersion on the one hand and improves the wettability of the anti-corrosion coating on the other.
Eine weitere vorteilhafte Ausgestaltung der Erfindung sieht vor, mit einer Dispersion nachzubehandeln, die zusätzlich Feinpartikel aus Kieselsäure oder Silikat enthält. Die Partikelgröße sollte in der gleichen Größenordnung wie die für die Tonerde liegen. Durch den zusätzlichen Gehalt an den genannten Komponenten wird auf der überzogenen Oberfläche eine Schicht mit einer dem Mullit (3 Al2O3 2 Si02) nahen Struktur geschaffen. Diese ist von der überzogenen Oberfläche besonders schwer ablösbar, verändert sich mit Zeitablauf kaum und bewirkt eine dauerhafte hydrophile Oberfläche.Another advantageous embodiment of the invention provides for aftertreatment with a dispersion which additionally contains fine particles of silica or silicate. The particle size should be of the same order of magnitude as that for the alumina. The additional content of the components mentioned creates a layer on the coated surface with a structure close to the mullite (3 Al 2 O 3 2 Si0 2 ). This is special from the coated surface difficult to remove, hardly changes over time and creates a permanent hydrophilic surface.
Gemäß einer anderen zweckmäßigen Ausgestaltung der Erfindung kann man mit einer wäßrigen Dispersion nachbehandeln, die Tannin enthält. Hierdurch wird die hydrophile Eigenschaft der überzogenen Oberfläche nochmals verbessert. Ein gleichartiger Erfolg wird erzielt, wenn man eine wäßrige Dispersion einsetzt, die Tonerde-Feinpartikel, Kieselerde-Feinpartikel und Tannin gemeinsam enthält.According to another expedient embodiment of the invention, post-treatment can be carried out with an aqueous dispersion which contains tannin. This further improves the hydrophilic property of the coated surface. A similar success is achieved if an aqueous dispersion is used which contains fine alumina particles, fine silica particles and tannin.
Schließlich läßt sich das erfindungsgemäße Verfahren auch derart ausgestalten, daß man mit einer Dispersion nachbehandelt, die wasserlösliches Kunstharz enthält.Finally, the process according to the invention can also be designed in such a way that aftertreatment is carried out with a dispersion which contains water-soluble synthetic resin.
Das Beimischen wasserlöslicher Kunstharze gestattet in eleganter Weise die Viskositätssteuerung der wäßrigen Dispersion und erleichtert damit das Regulieren der Auftragsmenge. Allerdings sollte der Kunstharzgehalt vergleichsweise klein sein.The admixture of water-soluble synthetic resins elegantly permits the viscosity control of the aqueous dispersion and thus facilitates the regulation of the application quantity. However, the resin content should be comparatively small.
Das innerhalb der Erfindung ggf. mitverwendete Tannin bedeutet Tannin oder Tanninsäure, wobei auch hydrolysierbares Tannin oder kondensierbares Tannin oder diese Formen teilweise gelöst enthaltende Vorstoffe eingesetzt werden können, z.B. Depsid, Gallotannin, chinesisches Tannin, türkisches Tannin, Hamamelitannin, Tanninsäure des Karako-Ahorns, Chebulinsäure, Sumachtannin, Tannin des japanischen Gallapfels, Ellagsäuretannin, Catechin, Catechintanninsäure sowie Tanninsäure der Quebrana [Quebrachogerbsäure].The tannin possibly used in the invention means tannin or tannic acid, whereby hydrolyzable tannin or condensable tannin or precursors containing these forms partially dissolved can also be used, e.g. Depsid, Gallotannin, Chinese Tannin, Turkish Tannin, Hamamelitannin, Tannic Acid of Karako Maple, Chebulinic Acid, Sumachannin, Tannin from Japanese GallApple, Ellagic Acid Tannin, Catechin, Catechintannic Acid and Tannic Acid from Quebrana [Quebrachogerbic Acid].
Das mit dem erfindungsgemäßen Verfahren erzeugte Schichtgewicht sollte etwa 0,01 bis 5 g/m2 (in getrocknetem Zustand) betragen. Bei weniger als 0,01 g/m2 ist eine ausreichend hydrophile Oberfläche kaum zu erzielen. Mehr als 5 g/m2 gelangen an die Grenze der Wirtschaftlichkeit. Bei einer Auftragsmenge von 0,1 bis 1 g/m2 erhält man einen Randwinkel bei Benetzung mit Wasser von unter 30°, was auf eine effektiv hydrophile Eigenschaft deutet.The layer weight produced with the method according to the invention should be approximately 0.01 to 5 g / m 2 (in the dried state). With less than 0.01 g / m 2 , a sufficiently hydrophilic surface can hardly be achieved. More than 5 g / m 2 reach the limit of economy. With an application amount of 0.1 to 1 g / m 2 you get one Contact angle when wetted with water of less than 30 °, which indicates an effectively hydrophilic property.
Die Erfindung wird anhand der folgenden Beispiele beispielsweise und näher erläutert.The invention is illustrated by the following examples, for example and in more detail.
Zunächst wurden zwei Partien von Aluminiumblechen mit korrosionsschützenden Überzügen (Grundschichten) versehen.Initially, two batches of aluminum sheets were provided with anti-corrosion coatings (base layers).
Die erste Partie wurde erhalten, indem die entfetteten und gespülten Bleche in eine wäßrige Harzlösung, die durch Reaktion von 220 g Ethylen-Acrylsäure-Copolymerharz, 43 g 28%igen Ammoniakwassers und 73,7 g deionisierten Wassers in einem Druckgefäß bei einer Temperatur von 130 °C unter ca. l-stündigem Rühren, anschließendem Kühlen und Verdünnen mit 28%igem Ammoniakwasser auf einen Feststoffgehalt von 22 % unter gleichzeitiger pH-Wert-Einstellung auf 9,5 + 0,5 und erneutem Verdünnen mit deionisiertem Wasser auf 10 Gew.-% Feststoffgehalt hergestellt worden war, für 10 Sekunden bei 20 °C getaucht wurden. Danach wurde mit einer Gummiwalze abgequetscht, unter 2-minütigem Trocknen in einem Trockenofen bei 130 °C die Feuchtigkeit entfernt und eine korrosionsbeständige Oberflächenschicht von 1,2 g/m2 gebildet.The first batch was obtained by removing the degreased and rinsed sheets in an aqueous resin solution by reacting 220 g of ethylene-acrylic acid copolymer resin, 43 g of 28% ammonia water and 73.7 g of deionized water in a pressure vessel at a temperature of 130 ° C with stirring for about 1 hour, then cooling and diluting with 28% ammonia water to a solids content of 22% while simultaneously adjusting the pH to 9.5 + 0.5 and again diluting with deionized water to 10%. -% solids had been prepared, immersed at 20 ° C for 10 seconds. It was then squeezed off with a rubber roller, the moisture was removed while drying in a drying oven at 130 ° C. for 2 minutes and a corrosion-resistant surface layer of 1.2 g / m 2 was formed.
Die zweite Partie wurde erhalten, indem ebenfalls entfettete und reinigte Aluminiumtafeln 1 Minute in eine saure Chromatierlösung bei 50 °C getaucht wurde. Dabei bildete sich ein Chromatüberzug mit einem Schichtgewicht von ca. 80 mg/m (berechnet als Chrom). Die so behandelten Bleche wurden abschließend gespült und getrocknet.The second batch was obtained by immersing degreased and cleaned aluminum panels in an acidic chromate solution at 50 ° C for 1 minute. A chromate coating was formed with a layer weight of approx. 80 mg / m (calculated as chromium). The sheets treated in this way were finally rinsed and dried.
Zur Nachbehandlung der vorgenannten Bleche wurden Dispersionen angesetzt.Dispersions were prepared for the aftertreatment of the aforementioned sheets.
Nachbehandlungsmittel 1:
- 10 Gew.-%Teile einer handelsüblichen 10 Gew.-%igen Tonerde-Dispersion, deren Tonerde einen durchschnittlichen Korndurchmesser von 10 Nanometer aufwies, wurden mit 0,5 Gew.-Teilen eines oberflächenaktiven Mittels des Nonylphenol-Typs versetzt und mit 88,5 Gew.-Teilen deionisierten Wassers verdünnt.
- 10 parts by weight of a commercially available 10% by weight alumina dispersion, the alumina of which had an average grain diameter of 10 nanometers, were mixed with 0.5 parts by weight of a nonylphenol-type surfactant and 88.5 Diluted parts by weight of deionized water.
Nachbehandlungsmittel 2:
- 70 Gew.-Teile der genannten 10 Gew.-%igen Tonerde-Dispersion, der 0,5 Gew.-Teile oberflächenaktives Mittel des Nonylphenol-Typs zugesetzt waren, wurden mit 29,5 Gew.-% deionisierten Wassers homogen vermischt.
- 70 parts by weight of the above 10% by weight alumina dispersion, to which 0.5 part by weight of surfactant of the nonylphenol type had been added, were homogeneously mixed with 29.5% by weight of deionized water.
Nachbehandlungsmittel 3:
- 10 Gew.-Teile der genannten handelsüblichen 10 Gew.-%igen Tonerde-Dispersion und 10 Gew.-Teile einer Dispersion von Kieselerde-Partikeln eines Korndurchmessers von 10 bis
- 20 Nanometer einer Konzentration von 20 Gew.-% (berechnet als Si02) wurden mit 80 Gew.-Teilen deionisierten Wassers verrührt.
- 10 parts by weight of the commercial 10% by weight alumina dispersion mentioned and 10 parts by weight of a dispersion of silica particles with a grain diameter of 10 to
- 20 nanometers with a concentration of 20 wt .-% (calculated as Si0 2 ) were stirred with 80 parts by weight of deionized water.
Nachbehandlungsmittel 4:
- 10 Gew.-Teile der genannten handelsüblichen Tonerde-Dispersion, 5 Gew.-Teile thermoplastischen Polyethylenoxyd-Kunstharzes und 0,5 Gew.-Teile eines oberflächenaktiven Mittels des Nonylphenol-Typs wurden mit 84,5 Gew.-Teilen deionisierten Wassers zu einer homogenen Dispersion vermischt.
- 10 parts by weight of the commercial alumina dispersion mentioned, 5 parts by weight of thermoplastic polyethylene oxide synthetic resin and 0.5 part by weight of a surface active agent of the nonylphenol type became homogeneous with 84.5 parts by weight of deionized water Dispersion mixed.
Nachbehandlungsmittel 5:
- 10 Gew.-Teile der genannten handelsüblichen Tonerde-Dispersion sowie 5 Gew.-Teile thermoplastischen Polyethylenoxyd-Kunstharzes und 1 Gew.-Teil Gerbsäure wurden mit 84 Gew.-Teilen deionisierten Wassers zu einer wäßrigen Dispersion vermischt.
- 10 parts by weight of the commercial alumina dispersion mentioned, 5 parts by weight of thermoplastic polyethylene oxide synthetic resin and 1 part by weight of tannic acid were mixed with 84 parts by weight of deionized water to form an aqueous dispersion.
Nachbehandlungsmittel 6:
- 10 Gew.-Teile der genannten handelsüblichen Tonerde-Dispersion, 10 Gew.-Teile der genannten Dispersion von Kieselerde-Partikeln (gemäß Nachbehandlungsmittel 3), 2 Gew.-Teile des genannten thermoplastischen Polyethylenoxyd-Kunstharzes sowie 1 Gew.-Teil Tanninsäure wurden zu einer homogenen Dispersion verrührt.
- 10 parts by weight of the commercial alumina dispersion mentioned, 10 parts by weight of the dispersion of silica particles (according to aftertreatment agent 3), 2 parts by weight of the thermoplastic polyethylene oxide resin and 1 part by weight of tannic acid were added a homogeneous dispersion.
Jeweils mehrere Bleche der durch Aufbringung eines Harzüberzuges bzw. einer Chromatschicht vorbehandelten Aluminiumbleche wurden mit den Nachbehandlungsmitteln 1 bis 6 nachbehandelt. Hierzu wurden die vorbehandelten Bleche mit dem Nachbehandlungsmittel bestrichen und durch Abquetschen mit Gummiwalzen von überschüssiger Dispersion befreit. Anschließend wurde im Trockenofen bei 130 °C getrocknet und so ein weiterer Überzug gebildet.Several sheets of the aluminum sheets pretreated by applying a resin coating or a chromate layer were aftertreated with the aftertreatment agents 1 to 6. For this purpose, the pre-treated sheets were coated with the after-treatment agent and excess dispersion was removed by squeezing with rubber rollers. It was then dried in a drying oven at 130 ° C., thus forming a further coating.
Die Testbleche wurden dann zur Ermittlung der Korrosionsbeständigkeit einem Salzwasser-Sprühtest (gemäß JIS-Z-2371) unterzogen. Die hydrophilen Eigenschaften wurden durch Messung des Randwinkels bewertet. Hierzu wurde ein auf der Oberfläche stehender kleiner Wassertropfen von 1 bis 2 mm Durchmesser mit Hilfe eines goniometrischen Randwinkelmessers G-I für Normaltemperaturen (Fabr. Elema Optics Co., Ltd.) gemessen. Es wurden jeweils die Werte nach der unmittelbaren Oberflächenbehandlung (anfangs) und nach einwöchigem Eintauchen in fließendes Wasser gemessen (nach 1 Woche).The test panels were then subjected to a salt water spray test (according to JIS-Z-2371) to determine the corrosion resistance. The hydrophilic properties were assessed by measuring the contact angle. For this purpose, a small water drop of 1 to 2 mm in diameter standing on the surface was measured with the aid of a goniometric contact angle meter G-I for normal temperatures (manufactured by Elema Optics Co., Ltd.). The values after the immediate surface treatment (initially) and after immersion in running water for one week were measured (after 1 week).
Note I Randwinkel unter 20°
- " II " 20 - 30°
- " III " 30 - 40° zunehmend gute Hydrophilie
- " IV " 40 - 50°
- " V über 50° schlechte Hydrophilie
- "II" 20-30 °
- "III" 30 - 40 ° increasingly good hydrophilicity
- "IV" 40 - 50 °
- "V over 50 ° poor hydrophilicity
In einem Vergleichsversuch wurden die lediglich vorbehandelten Aluminiumbleche auf Hydrophilie und Korrosionsbeständigkeit untersucht (Beispiele 13 und 14).In a comparative experiment, the only pretreated aluminum sheets were examined for hydrophilicity and corrosion resistance (Examples 13 and 14).
Die Ergebnisse sämtlicher Versuche sind in der folgenden Tabelle zusammengestellt. Die Korrosionsbeständigkeit betrug übereinstimmend für alle Versuche mindestens 240 Stunden.
Claims (7)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58100770A JPS59229197A (en) | 1983-06-08 | 1983-06-08 | Surface treatment procedure for aluminum heat exchanger |
| JP100770/83 | 1983-06-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0128514A2 true EP0128514A2 (en) | 1984-12-19 |
| EP0128514A3 EP0128514A3 (en) | 1986-08-13 |
Family
ID=14282720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP84106430A Withdrawn EP0128514A3 (en) | 1983-06-08 | 1984-06-05 | Process for treating surfaces of heat exchangers |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0128514A3 (en) |
| JP (1) | JPS59229197A (en) |
| AU (1) | AU2894684A (en) |
| BR (1) | BR8402758A (en) |
| DE (1) | DE3420852A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5813452A (en) * | 1994-04-01 | 1998-09-29 | Kansai Paint Co., Ltd. | Coating composition for hydrophilization and method for hydrophilization |
| WO2004087339A1 (en) * | 2003-03-31 | 2004-10-14 | Behr Gmbh & Co. Kg | Heat exchanger and method for treating the surface of said heat exchanger |
| WO2005052489A2 (en) * | 2003-11-26 | 2005-06-09 | Behr Gmbh & Co. Kg | Heat exchanger |
| WO2006079448A1 (en) * | 2005-01-26 | 2006-08-03 | Klingenburg Gmbh | Humidity- and/or heat-exchange device, for example a plate heat exchanger, sorption rotor, adsorption dehumidifying rotor or the similar |
| WO2018067679A1 (en) * | 2016-10-04 | 2018-04-12 | 3M Innovative Properties Company | Methods of making and using heat exchangers |
| EP2252735B1 (en) * | 2008-02-22 | 2020-06-03 | BSH Hausgeräte GmbH | Home device for drying laundry comprising a component around which process air can flow |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07109355B2 (en) * | 1986-05-20 | 1995-11-22 | 日本パ−カライジング株式会社 | Aluminum heat exchanger and manufacturing method thereof |
| DE19812577C1 (en) * | 1998-03-21 | 2000-05-25 | Gerhard Fauner | Chemically and-or physically curing or setting material mixture, especially a mortar, cement or adhesive, comprises a nano-fine inorganic binder and a binder reaction partner, accelerator or catalyst |
| DE102011086414A1 (en) * | 2011-11-15 | 2013-05-16 | BSH Bosch und Siemens Hausgeräte GmbH | Heat exchanger for laundry treatment machine e.g. clothes dryer used in house, has anodized coat which is formed in particulate-repellent surface layer formed with outer surface |
| JP6374219B2 (en) * | 2014-05-23 | 2018-08-15 | 三菱アルミニウム株式会社 | Fin material for heat exchanger and manufacturing method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1264462B (en) * | 1961-06-30 | 1968-03-28 | Hubert Salmen | Use of synthetic resins as a coating material for metallic heat exchange surfaces |
| DE2432593A1 (en) * | 1974-07-06 | 1976-01-22 | Nippon Paint Co Ltd | Duplex org.-inorg. coating in conducting materials - surface being covered with inorg. coating over which coating is applied by electrophoresis |
| GB1438300A (en) * | 1972-11-16 | 1976-06-03 | Prb Sa | Rust inhibitor |
| GB2021440A (en) * | 1978-03-29 | 1979-12-05 | Gen Electric | Process for rendering surfaces permanenty water wettable and products thusproduced |
| JPS582596A (en) * | 1981-06-30 | 1983-01-08 | Nippon Parkerizing Co Ltd | Surface treatment for heat exchanger made of aluminum |
-
1983
- 1983-06-08 JP JP58100770A patent/JPS59229197A/en active Pending
-
1984
- 1984-06-01 AU AU28946/84A patent/AU2894684A/en not_active Abandoned
- 1984-06-05 DE DE19843420852 patent/DE3420852A1/en not_active Withdrawn
- 1984-06-05 EP EP84106430A patent/EP0128514A3/en not_active Withdrawn
- 1984-06-07 BR BR8402758A patent/BR8402758A/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1264462B (en) * | 1961-06-30 | 1968-03-28 | Hubert Salmen | Use of synthetic resins as a coating material for metallic heat exchange surfaces |
| GB1438300A (en) * | 1972-11-16 | 1976-06-03 | Prb Sa | Rust inhibitor |
| DE2432593A1 (en) * | 1974-07-06 | 1976-01-22 | Nippon Paint Co Ltd | Duplex org.-inorg. coating in conducting materials - surface being covered with inorg. coating over which coating is applied by electrophoresis |
| GB2021440A (en) * | 1978-03-29 | 1979-12-05 | Gen Electric | Process for rendering surfaces permanenty water wettable and products thusproduced |
| JPS582596A (en) * | 1981-06-30 | 1983-01-08 | Nippon Parkerizing Co Ltd | Surface treatment for heat exchanger made of aluminum |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN, Band 7, Nr. 74 (M-203) [1219], 26. März 1983; & JP-A-58 002 596 (NIPPON PARKERIZING K.K.) 08.01.1983 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5813452A (en) * | 1994-04-01 | 1998-09-29 | Kansai Paint Co., Ltd. | Coating composition for hydrophilization and method for hydrophilization |
| WO2004087339A1 (en) * | 2003-03-31 | 2004-10-14 | Behr Gmbh & Co. Kg | Heat exchanger and method for treating the surface of said heat exchanger |
| CN100457293C (en) * | 2003-03-31 | 2009-02-04 | 贝洱两合公司 | Heat exchanger and method for treating the surface of said heat exchanger |
| WO2005052489A2 (en) * | 2003-11-26 | 2005-06-09 | Behr Gmbh & Co. Kg | Heat exchanger |
| WO2005052489A3 (en) * | 2003-11-26 | 2005-07-28 | Behr Gmbh & Co Kg | Heat exchanger |
| WO2006079448A1 (en) * | 2005-01-26 | 2006-08-03 | Klingenburg Gmbh | Humidity- and/or heat-exchange device, for example a plate heat exchanger, sorption rotor, adsorption dehumidifying rotor or the similar |
| EP2252735B1 (en) * | 2008-02-22 | 2020-06-03 | BSH Hausgeräte GmbH | Home device for drying laundry comprising a component around which process air can flow |
| WO2018067679A1 (en) * | 2016-10-04 | 2018-04-12 | 3M Innovative Properties Company | Methods of making and using heat exchangers |
Also Published As
| Publication number | Publication date |
|---|---|
| BR8402758A (en) | 1985-05-14 |
| AU2894684A (en) | 1984-12-13 |
| EP0128514A3 (en) | 1986-08-13 |
| JPS59229197A (en) | 1984-12-22 |
| DE3420852A1 (en) | 1984-12-13 |
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