DE669414C - Process for the production of oxidic protective layers on iron and steel - Google Patents
Process for the production of oxidic protective layers on iron and steelInfo
- Publication number
- DE669414C DE669414C DEV33761D DEV0033761D DE669414C DE 669414 C DE669414 C DE 669414C DE V33761 D DEV33761 D DE V33761D DE V0033761 D DEV0033761 D DE V0033761D DE 669414 C DE669414 C DE 669414C
- Authority
- DE
- Germany
- Prior art keywords
- alkaline
- compounds
- iron
- steel
- protective layers
- 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
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/34—Anodisation of metals or alloys not provided for in groups C25D11/04 - C25D11/32
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Description
Verfahren zur Erzeugung oxydischer Schutzschichten auf Eisen und Stahl Gegenstand der Erfindung ist ein Verfahren, in einem Kreislaufprozeß auf elektrolytischem Wege oxydische Schutzschichten auf Eisen und Stahl zu erzeugen, die gegen mechanische, thermische und chemische Einwirkungen widerstandsfähig sind.Process for the production of oxidic protective layers on iron and steel The invention relates to a method in a circulatory process on an electrolytic basis Ways to create protective layers on iron and steel that protect against mechanical, thermal and chemical effects are resistant.
Die Erzeugung oxydischer Schichten auf Eisen und Stahl in alkalischen Bädern bei Anwendung hoher Temperaturen und Stromdichten ist bekannt. Die dabei erzielten Verfärbungen bieten jedoch keinen Korrosionsschutz, so daß sie lediglich als Färbeverfahren anzusprechen sind.The production of oxide layers on iron and steel in alkaline Bathing with high temperatures and current densities is known. The one with it However, the discolorations achieved do not offer any protection against corrosion, so that they only are to be addressed as a dyeing process.
Demgegenüber werden nach dem Verfahren gemäß der Erfindung in alkalischen Bädern mit sehr niedrigen Stromdichten unter technisch einfachster Handhabung oxydische Schutzschichten erzeugt, welche den an Korrosionsfestigkeit zu stellenden Forderungen weitgehend genügen.In contrast, according to the method according to the invention in alkaline Oxydic baths with very low current densities and technically easy handling Protective layers are produced which meet the requirements for corrosion resistance largely suffice.
Das Verfahren gemäß der Erfindung wird vorteilhaft in der Weise ausgeführt, daß die zu behandelnden Gegenstände in einem alkalischen Bade anodisch geschaltet werden, das eine oder mehrere sauerstoffabgebende, vornehmlich regenerierfähige organische Nitroverbindungen, z. B. Nitrobenzoesäure, Nitrobenzoylchlorid, sowie alkalische Metallverbindungen von Kupfer oder anderen Metallen gelöst enthält, welche in alkalischen Lösungen einfache oder komplexe Verbindungen ergeben.The method according to the invention is advantageously carried out in such a way that the objects to be treated are connected anodically in an alkaline bath be, the one or more oxygen-releasing, primarily regenerable organic nitro compounds, e.g. B. nitrobenzoic acid, nitrobenzoyl chloride, and contains alkaline metal compounds dissolved in copper or other metals, which result in simple or complex compounds in alkaline solutions.
Man stellt zu diesem Zweck zunächst durch chemische Auflösung von
z. B. Kupfer in einer wässerigen alkalischen Lösung, die z. B. 349 Nitrobenzoesäure,
309 Ätznatron und 25g Kalituncyanid im Liter enthält, bei einer Temperatur
von ungefähr 6o° C ein Bad bis zu seiner Sättigung her. In diesem Bade werden die
fettfreien Gegenstände bei der angegebenen Temperatur von 6o° und einer Stromdichte
von o,5 bis i,o Amp; qdm Oberfläche bei etwa i Volt Klemmenspannung 2 bis 5 Minuten
anodisch behandelt. Die
Schichtdicke hängt von der Zeitdauer des
Stromdurchganges ab. Als Elektrolyseur kann eine Eisenwanne verwendet werden, welche
zugleich als Kathode dient. @o
Dieser kontinuierliche Arbeitsvorgang wird durch ein eingebautes Rührwerk und gegebenenfalls durch geringe Mengen Alkaliperchlorat stark gefördert.This continuous operation is made possible by a built-in agitator and, if necessary, strongly promoted by small amounts of alkali metal perchlorate.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEV33761D DE669414C (en) | 1937-04-18 | 1937-04-18 | Process for the production of oxidic protective layers on iron and steel |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEV33761D DE669414C (en) | 1937-04-18 | 1937-04-18 | Process for the production of oxidic protective layers on iron and steel |
Publications (1)
Publication Number | Publication Date |
---|---|
DE669414C true DE669414C (en) | 1938-12-24 |
Family
ID=7588351
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEV33761D Expired DE669414C (en) | 1937-04-18 | 1937-04-18 | Process for the production of oxidic protective layers on iron and steel |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE669414C (en) |
-
1937
- 1937-04-18 DE DEV33761D patent/DE669414C/en not_active Expired
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