EP0255896A2 - Process for depositing self-cleaning Al-free enamel layers by electrophoresis on steel sheets - Google Patents
Process for depositing self-cleaning Al-free enamel layers by electrophoresis on steel sheets Download PDFInfo
- Publication number
- EP0255896A2 EP0255896A2 EP87110663A EP87110663A EP0255896A2 EP 0255896 A2 EP0255896 A2 EP 0255896A2 EP 87110663 A EP87110663 A EP 87110663A EP 87110663 A EP87110663 A EP 87110663A EP 0255896 A2 EP0255896 A2 EP 0255896A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- cleaning
- layer
- enamel
- self
- electrophoresis
- 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.)
- Granted
Links
- 210000003298 dental enamel Anatomy 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000004140 cleaning Methods 0.000 title claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 7
- 239000010959 steel Substances 0.000 title claims abstract description 7
- 238000000151 deposition Methods 0.000 title description 3
- 238000001962 electrophoresis Methods 0.000 title description 2
- 239000000725 suspension Substances 0.000 claims abstract description 3
- 239000002253 acid Substances 0.000 claims description 3
- 239000000758 substrate Substances 0.000 abstract description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract 1
- 229910052782 aluminium Inorganic materials 0.000 abstract 1
- 239000004411 aluminium Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 22
- 238000000576 coating method Methods 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000008021 deposition Effects 0.000 description 2
- 238000004070 electrodeposition Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000003929 acidic solution Substances 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005370 electroosmosis Methods 0.000 description 1
- 238000001652 electrophoretic deposition Methods 0.000 description 1
- 238000010406 interfacial reaction Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/02—Electrophoretic coating characterised by the process with inorganic material
Definitions
- the present invention relates to an improved method for electrophoretic deposition of self-cleaning enamel layers, in which first a base enamel layer is deposited on the sheet steel part, then the cover enamel layer is applied and both layers are baked together.
- Electrodeposition enamelling is normally limited to the application of a single layer, since it requires a conductive, metallic surface.
- Electro-osmosis solidifies the deposited layer during application, which then rinses off loosely adhering particles and under certain conditions, e.g. sufficient solid deposition and products coordinated with regard to melting behavior and interfacial reactions even allow the application of a further layer on this substrate. In the case of product combinations with good electrodeposition of both systems, this second layer can then also be deposited electrophoretically.
- the present invention therefore relates to a process for the electrophoretic construction of continuously self-cleaning systems on sheet steel in a two-layer / a Braund process, which is characterized in that the base layer is applied in a layer thickness between 80 and 120 ⁇ m and the spec .
- Conductivity set to less than 2000 ⁇ S.cm ⁇ 1.
- the method according to the invention is preferably used for the production of continuously self-cleaning inner parts of the stove. Acid-resistant direct emails are preferred as the base layer.
- Suitable starting materials for the first layer are all ETE-compatible, known basic emails or special emails, whose slip after grinding - before adding Na aluminate - a spec. Conductivity does not exceed 2000 ⁇ S.cm ⁇ 1.
- Parts made of enameable steel sheet are first degreased by chemical and / or electrolytic steps - possibly with ultrasound support -, rinsed with H2O, activated in acidic solution, rinsed again and then in l.
- Application basin electrophoretically coated with a base layer (coating time approx. 7-8 seconds).
- the electrophoretic build-up of the self-cleaning layer is carried out in a second application basin (exposure time about 15 seconds). After loosely adhering, non-electrophoretically separated particles are rinsed in (8l0 - 840 ° C, residence times about 2.5 to 4 min.) - The exact baking conditions depend on the sheet thickness, the selected enamels and the weight of the parts.
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Laminated Bodies (AREA)
- Paints Or Removers (AREA)
- Insulated Metal Substrates For Printed Circuits (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Physical Vapour Deposition (AREA)
- Coating With Molten Metal (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft ein verbessertes Verfahren zur elektrophoretischen Abscheidung von selbstreinigenden Emailschichten, bei dem zunächst eine Grundemailschicht auf das Stahlblechteil abgeschieden, dann die Deckemailschicht aufgebracht und beide Schichten gemeinsam eingebrannt werden.The present invention relates to an improved method for electrophoretic deposition of self-cleaning enamel layers, in which first a base enamel layer is deposited on the sheet steel part, then the cover enamel layer is applied and both layers are baked together.
Der Emailauftrag mittels Elektrotauchemaillierung (Elektrophorese, sog. ETE-Verfahren) ist bekannt. Produktionsanlagen unterschiedlicher Bauart - in erster Linie für Hausgeräteteile - sind in der Literatur beschrieben (vgl. z.B. Warnke, F. Kaup Maschinenmarkt 80 (l974), S. 4 oder H. Hoffmann, Mitteilungen des VDEFa 24 (l976) S. l3 und 29 (l98l) S. l07). Normalerweise ist die Elektrotauchemaillierung auf den Auftrag einer einzigen Schicht beschränkt, da sie einen leitenden, metallischen Untergrund voraussetzt.The email application by means of electro-dip enamelling (electrophoresis, so-called ETE process) is known. Production systems of different designs - primarily for household appliance parts - are described in the literature (see e.g. Warnke, F. Kaup Maschinenmarkt 80 (l974), p. 4 or H. Hoffmann, Mitteilungen der VDEFa 24 (l976) p. 13 and 29 (l98l) p. l07). Electrodeposition enamelling is normally limited to the application of a single layer, since it requires a conductive, metallic surface.
Eine einmal gebrannte Emaillierung kann nicht mehr elektrophoretisch weiterbeschichtet werden.Once enamelled, it can no longer be coated electrophoretically.
Durch Elektroosmose entsteht während des Auftrags eine Verfestigung der abgeschiedenen Schicht, die ein anschließendes Abspülen lose anhaftender Teilchen und unter bestimmten Voraussetzungen wie z.B. genügend feste Abscheidung sowie hinsichtlich Aufschmelzverhalten und Grenzflächenreaktionen abgestimmte Produkte sogar den Auftrag einer weiteren Schicht auf diesem Untergrund ermöglicht. Bei Produktkombinationen mit guter Elektrotauchabscheidung beider Systeme kann diese zweite Schicht dann auch wieder elektrophoretisch abgeschieden werden.Electro-osmosis solidifies the deposited layer during application, which then rinses off loosely adhering particles and under certain conditions, e.g. sufficient solid deposition and products coordinated with regard to melting behavior and interfacial reactions even allow the application of a further layer on this substrate. In the case of product combinations with good electrodeposition of both systems, this second layer can then also be deposited electrophoretically.
Diese Verfahrensweise ist jedoch relativ störanfällig und bei den bis jetzt betriebenen Verfahren traten immer wieder Emaillierfehler (Oberflächenstörungen durch elektrolytisch bedingte Bläschenbildungen, ungleichmäßige Beschichtungen bis zum Abheben der gesamten Schicht durch Gasblasen) auf.However, this procedure is relatively susceptible to faults, and enamelling errors repeatedly occurred in the processes operated up to now (surface defects due to electrolytically caused bubbles, uneven coatings until the entire layer was lifted off by gas bubbles).
Überraschenderweise wurde nun gefunden, daß man die obengenannten Nachteile vermeiden kann, wenn bei der Herstellung der Emailschichten bestimmte Bedingungen eingehalten werden. So hat sich z.B. herausgestellt, daß ein elektrophoretischer Grundauftrag zwischen etwa 80 und l20 µm Schichtdicke beim anschließenden Aufbringen kontinuierlich selbstreinigender Systeme wesentlich bessere Emailqualitäten ermöglicht. Dies war umso überraschender, da bisher die Grundschicht bei solchen Zweischicht/ein Brand-Emaillierungen wesentlich dünner (ca. 20 - 40 µm) aufgetragen werden mußte, um gute Ergebnisse hinsichtlich der Oberflächenqualität der Deckemaillierung zu erhalten.Surprisingly, it has now been found that the above-mentioned disadvantages can be avoided if certain conditions are observed in the production of the enamel layers. It has been found, for example, that an electrophoretic basic application of between about 80 and 120 μm layer thickness enables substantially better enamel qualities when subsequently applying continuously self-cleaning systems. This was all the more surprising, since previously the base layer had to be applied much thinner (approx. 20 - 40 µm) in such two-layer / fire enamels in order to obtain good results with regard to the surface quality of the top enamel.
Ferner wurde gefunden, daß wesentlich einheitlichere und weniger Fehler aufweisende Beschichtungen erzielt werden können, wenn man die spez. Leitfähigkeit der Deckemailsuspension so einstellt, daß ein Wert von etwa 2000 µS.cm⁻¹ nicht überschritten wird. Bei den bisher bekannten ETE-Verfahren werden Schlickerleitfähigkeiten von ca. 2500 - 3000 µS.cm⁻¹ für eine ausreichend gleichmäßige Abscheidung benötigt.It was also found that much more uniform and less error-prone coatings can be achieved if the spec. Adjust the conductivity of the ceiling email suspension so that a value of about 2000 µS.cm⁻¹ is not exceeded. In the previously known ETE processes, slip conductivities of approx. 2500 - 3000 µS.cm⁻¹ are required for a sufficiently uniform deposition.
Gegenstand der vorliegenden Erfindung ist daher ein Verfahren zum elektrophoretischen Aufbau kontinuierlich selbstreinigender Systeme auf Stahlblech im Zweischicht/ein Braund-Verfahren, welches dadurch gekennzeichnet ist, daß man die Grundschicht in einer Schichtstärke zwischen 80 und l20 µm aufbringt und bei der Abscheidung der Deckemailsuspension die spez. Leitfähigkeit auf weniger als 2000 µS.cm⁻¹ eingestellt.The present invention therefore relates to a process for the electrophoretic construction of continuously self-cleaning systems on sheet steel in a two-layer / a Braund process, which is characterized in that the base layer is applied in a layer thickness between 80 and 120 μm and the spec . Conductivity set to less than 2000 µS.cm⁻¹.
Das erfindungsgemäße Verfahren wird bevorzugt für die Herstellung von kontinuierlich selbstreinigenden Herdinnenteilen eingesetzt. Als Grundschicht kommen dabei bevorzugt säurebeständige Direktemails infrage.The method according to the invention is preferably used for the production of continuously self-cleaning inner parts of the stove. Acid-resistant direct emails are preferred as the base layer.
Als zusätzlichen technischen Vorteil bringt die Arbeitsweise mit dickeren Grundschichten gute Kombinationsmöglichkeiten selbstreinigender Emaillierungen im Zweischicht/ein Brand-Verfahren mit normalen Grundbeschichtungen oder unterschiedlich eingefärbten säurebeständigen Direktemaillierungen in einer Anlage. Z.B. können 70 % der Teile nur einen Auftrag erhalten und dann gebrannt werden, 30 % der Teile durchlaufen nach unverändertem Durchlauf der l. Beschichtungsstation dann das 2. Beschichtungsbecken.As an additional technical advantage, working with thicker base layers offers good combinations of self-cleaning enamels in two layers / a fire process with normal base coatings or differently colored acid-resistant direct enamels in one system. For example, 70% of the parts can only receive one order and then be burned, 30% of the parts go through after an unchanged run the l. Coating station then the 2nd coating basin.
Als Ausgangsmaterialien eignen sich für die erste Schicht alle ETE-tauglichen, an sich bekannten Grundemails oder Spezialemails, deren Schlicker nach der Vermahlung - vor der Zugabe von Na-Aluminat - eine spez. Leitfähigkeit von 2000 µS.cm⁻¹ nicht überschreitet.Suitable starting materials for the first layer are all ETE-compatible, known basic emails or special emails, whose slip after grinding - before adding Na aluminate - a spec. Conductivity does not exceed 2000 µS.cm⁻¹.
Als zweite Schicht eignen sich alle an sich bekannten Al-freien Systeme mit selbstreinigenden Eigenschaften.All known Al-free systems with self-cleaning properties are suitable as a second layer.
Das erfindungsgemäße Verfahren wird in einer allgemeinen Ausführungsform etwa wie folgt ansgeführt:In a general embodiment, the process according to the invention is given approximately as follows:
Teile aus emaillierfähigem Stahlblech werden zunächst durch chemisch und/oder elektrolytische Schritte - eventuell mit Ultraschallunterstützung - entfettet, mit H₂O gespült, in saurer Lösung aktiviert, abermals gespült und anschließend im l. Auftragsbecken mit einer Grundschicht elektrophoretisch beschichtet (Beschichtungszeit etwa 7 - 8 Sekunden).Parts made of enameable steel sheet are first degreased by chemical and / or electrolytic steps - possibly with ultrasound support -, rinsed with H₂O, activated in acidic solution, rinsed again and then in l. Application basin electrophoretically coated with a base layer (coating time approx. 7-8 seconds).
Nach einer sorgfältigen Zwischenspülung erfolgt in einem 2. Auftragsbecken der elektrophoretische Aufbau der selbstreinigenden Schicht (Expositionszeit etwa l5 Sekunden). Nach Abspülen lose anhaftender, nicht elektrophoretisch abgeschiedener Teilchen erfolgt der Einbrand (8l0 - 840°C, Verweilzeiten etwa 2,5 bis 4 min.) - Die exakten Einbrennbedingungen richten sich nach der Blechstärke, den ausgewählten Emails bzw. dem Gewicht der Teile.After careful intermediate rinsing, the electrophoretic build-up of the self-cleaning layer is carried out in a second application basin (exposure time about 15 seconds). After loosely adhering, non-electrophoretically separated particles are rinsed in (8l0 - 840 ° C, residence times about 2.5 to 4 min.) - The exact baking conditions depend on the sheet thickness, the selected enamels and the weight of the parts.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT87110663T ATE52818T1 (en) | 1986-08-05 | 1987-07-23 | PROCESS FOR ELECTROPHORETIC DEVELOPMENT OF AFREE SELF-CLEANING ENAMEL COATINGS ON SHEET STEEL PARTS. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3626424 | 1986-08-05 | ||
| DE19863626424 DE3626424A1 (en) | 1986-08-05 | 1986-08-05 | METHOD FOR THE ELECTROPHORETIC CONSTRUCTION OF AL-FREE SELF-CLEANING ENAMEL LAYERS ON STEEL SHEET PARTS |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0255896A2 true EP0255896A2 (en) | 1988-02-17 |
| EP0255896A3 EP0255896A3 (en) | 1988-07-20 |
| EP0255896B1 EP0255896B1 (en) | 1990-05-16 |
Family
ID=6306694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87110663A Expired - Lifetime EP0255896B1 (en) | 1986-08-05 | 1987-07-23 | Process for depositing self-cleaning al-free enamel layers by electrophoresis on steel sheets |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4822463A (en) |
| EP (1) | EP0255896B1 (en) |
| AT (1) | ATE52818T1 (en) |
| DE (2) | DE3626424A1 (en) |
| ES (1) | ES2015016B3 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0453897A1 (en) * | 1990-04-25 | 1991-10-30 | Bayer Ag | Self-cleaning coatings for oven walls |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2917710A1 (en) * | 1979-05-02 | 1980-11-13 | Volkswagenwerk Ag | Electrophoretic application of aluminium enamels to iron - or steel, from bath contg. enamel frit and organic binder |
| EP0036558A1 (en) * | 1980-03-22 | 1981-09-30 | Bayer Ag | Coated metal article and method of manufacturing the same |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3935088A (en) * | 1970-09-12 | 1976-01-27 | Miele & Cie | Electrophoretic enamelling of ferrous articles |
| DE2923589B1 (en) * | 1979-06-11 | 1980-06-04 | Basf Farben & Fasern | Aqueous dispersion |
| DE3333072A1 (en) * | 1983-09-14 | 1985-03-21 | Basf Farben + Fasern Ag, 2000 Hamburg | COATING SIZE, METHOD FOR PRODUCING COATINGS AND COATED SUBSTRATE |
-
1986
- 1986-08-05 DE DE19863626424 patent/DE3626424A1/en active Granted
-
1987
- 1987-07-16 US US07/074,385 patent/US4822463A/en not_active Expired - Fee Related
- 1987-07-23 ES ES87110663T patent/ES2015016B3/en not_active Expired - Lifetime
- 1987-07-23 AT AT87110663T patent/ATE52818T1/en not_active IP Right Cessation
- 1987-07-23 DE DE8787110663T patent/DE3762761D1/en not_active Expired - Lifetime
- 1987-07-23 EP EP87110663A patent/EP0255896B1/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2917710A1 (en) * | 1979-05-02 | 1980-11-13 | Volkswagenwerk Ag | Electrophoretic application of aluminium enamels to iron - or steel, from bath contg. enamel frit and organic binder |
| EP0036558A1 (en) * | 1980-03-22 | 1981-09-30 | Bayer Ag | Coated metal article and method of manufacturing the same |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0453897A1 (en) * | 1990-04-25 | 1991-10-30 | Bayer Ag | Self-cleaning coatings for oven walls |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0255896A3 (en) | 1988-07-20 |
| US4822463A (en) | 1989-04-18 |
| ATE52818T1 (en) | 1990-06-15 |
| DE3762761D1 (en) | 1990-06-21 |
| DE3626424C2 (en) | 1989-08-17 |
| DE3626424A1 (en) | 1988-02-11 |
| EP0255896B1 (en) | 1990-05-16 |
| ES2015016B3 (en) | 1990-08-01 |
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