DE2947188C2 - Process for the pretreatment of steel parts to be coated electrophoretically with enamel - Google Patents
Process for the pretreatment of steel parts to be coated electrophoretically with enamelInfo
- Publication number
- DE2947188C2 DE2947188C2 DE19792947188 DE2947188A DE2947188C2 DE 2947188 C2 DE2947188 C2 DE 2947188C2 DE 19792947188 DE19792947188 DE 19792947188 DE 2947188 A DE2947188 A DE 2947188A DE 2947188 C2 DE2947188 C2 DE 2947188C2
- Authority
- DE
- Germany
- Prior art keywords
- enamel
- steel parts
- pretreatment
- electrophoretically
- coated
- 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
Links
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
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)
- Chemically Coating (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Description
1515th
Die Erfindung betrifft ein Verfahren zur Vorbehandlung von elektrophoretisch mit Email zu beschichtenden Stahiieikn.The invention relates to a method for the pretreatment of enamel to be coated electrophoretically Stahiieikn.
Bei bekannten Verfahren tritt der Nachteil auf, daß eine einwandfreie Weißemaillierung nicht möglich ist, da durch die anodische Polung des Werkstückes Ni und Fe oxidiert Dadurch tritt eine Verfärbung des abgeschiedenen Emails auf. Außerdem verfärbt sich nach dem Durchsatz von mehreren Teilen durch diese Oxidation der im Behälter vorhandene Schlicker, und es erfolgt eine Braun- oder Gelbfärbung.In known processes, the disadvantage arises that perfect white enamelling is not possible, as Ni and Fe are oxidized due to the anodic polarity of the workpiece separated emails. In addition, it will discolour after several parts have passed through them Oxidation of the slurry present in the container, and it turns brown or yellow.
Ein weiterer Nachteil ist, daß ein Teil des für die Emailhaftung benötigten Ni für die Haftungsreaktion verlorengehtAnother disadvantage is that some of the for the Enamel adhesion required Ni for the adhesion reaction is lost
Aus der britischen Patentschrift 8 18 264 und aus der US-Patentschrift 20 56 399 ist es bekannt auf Zinkzwischenschichten Emaillierungen aufzubringen. Bei den in diesen Schriften beschriebenen Emaillierungen handelt es sich jedoch offensichtlich um das übliche Auftragen des Emails durch Aufspritzen, Dabei kommen die zu emaillierenden Stahlteile nur mit dem jeweils aufgespritzten Email in Berührung. Die Verunreinigung eines Tauchbades mit Ni- oder Fe-oxjden kann also nicht eintreten. Es ist weiterhin ein Verfahren bekannt, bei dem die Stahloberflächen der ,zu emaillierenden Metallteile erst vernickelt und dann mit einem Zinküberzug versehen werden. Es sind also 2 getrennte Verfahrensschritte vorgesehen, die einen erheblichen Aufwand darstellen.From British patent specification 8 18 264 and from It is known from US Pat. No. 20 56 399 on zinc interlayers Apply enamelling. The enamelling described in these documents is However, it is obviously a matter of the usual application of the enamel by spraying on, which is also the case enamelling steel parts only come into contact with the enamel that has been sprayed on. The contamination of a Immersion baths with Ni or Fe oxides cannot occur. It is also known a method at which the steel surfaces of the metal parts to be enamelled are first nickel-plated and then with a Zinc coating. So there are 2 separate process steps provided, which are a significant Represent effort.
Die Aufgabe der Erfindung besteht darin, die beim elektrophoretischen Beschichten von Stahlteilen mit Email bekannten Nachteile zu vermeiden und ein Verfahren zur Vorbehandlung von elektrophoretisch mit Email zu beschichtenden Stahlteilen zu offenbaren, bei welchem das abgeschiedene Email und der im Beschichtungsbehälter befindliche Schlicker guvh nach längerem Gebrauch sich farblich nicht verändert und das möglichst aufwandgering istThe object of the invention consists in the electrophoretic coating of steel parts with Email to avoid known disadvantages and a method for the pretreatment of electrophoretically to reveal steel parts to be coated with enamel, in which the deposited enamel and the im The slip in the coating tank is good The color does not change after a long period of use and is as easy as possible
Eine Lösung dieser Aufgabe wird nach der Erfindung darin gesehen, daß die Stahlteile auf der Oberfläche mit einem einzigen kombinierten Haftgrund aus Nickel und Zink versehen werden.A solution to this problem is seen according to the invention that the steel parts on the surface with a single combined primer made of nickel and zinc.
Die Co-abscheidung beider Metalle auf der Oberfläche der emaillierenden Bleche erbringt besonders günstige Ergebnisse im Hinblick auf die Porenfreiheit und Haftung der Emailschicht und läßt sich weiterhin besonders wirtschaftlich durchführen.The co-deposition of both metals on the surface of the enamelling sheets is particularly beneficial favorable results with regard to the freedom from pores and adhesion of the enamel layer and can still be perform particularly economically.
Zur Durchführung des Verfahrens werden Nickelsalze und Zinksalze bei 30" C galvanisch bzw. bei 8O0C erst stromlos und dann im selben Bad kurz unter Stromeinwirkung gemeinsam abgeschieden. Die Bleche werden dann weiterhin mit einem handelsüblichen Schlicker elektrophoretisch beschichtet Dabei erhält man eine festhaftende Schicht die keine Verfärbung aufgrund von Oxidationsprodukten aufweistTo perform the process nickel salts and zinc salts at 30 "C will only be de-energized then deposited galvanically or at 8O 0 C and in the same bath briefly with current action together. The plates are then further coated electrophoretically with a commercially available slip case to a firmly adhering layer receives the shows no discoloration due to oxidation products
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19792947188 DE2947188C2 (en) | 1979-11-23 | 1979-11-23 | Process for the pretreatment of steel parts to be coated electrophoretically with enamel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19792947188 DE2947188C2 (en) | 1979-11-23 | 1979-11-23 | Process for the pretreatment of steel parts to be coated electrophoretically with enamel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE2947188A1 DE2947188A1 (en) | 1981-05-27 |
| DE2947188C2 true DE2947188C2 (en) | 1983-07-14 |
Family
ID=6086659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19792947188 Expired DE2947188C2 (en) | 1979-11-23 | 1979-11-23 | Process for the pretreatment of steel parts to be coated electrophoretically with enamel |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE2947188C2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2344434C3 (en) * | 1973-09-04 | 1980-06-19 | Miele & Cie Gmbh & Co, 4830 Guetersloh | Process for galvanizing steel parts |
-
1979
- 1979-11-23 DE DE19792947188 patent/DE2947188C2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE2947188A1 (en) | 1981-05-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| OP8 | Request for examination as to paragraph 44 patent law | ||
| D2 | Grant after examination | ||
| 8320 | Willingness to grant licences declared (paragraph 23) | ||
| 8364 | No opposition during term of opposition | ||
| 8339 | Ceased/non-payment of the annual fee |