DE358652C - Process to make iron and other metals resistant to rusting and corrosion - Google Patents

Process to make iron and other metals resistant to rusting and corrosion

Info

Publication number
DE358652C
DE358652C DEP37889D DEP0037889D DE358652C DE 358652 C DE358652 C DE 358652C DE P37889 D DEP37889 D DE P37889D DE P0037889 D DEP0037889 D DE P0037889D DE 358652 C DE358652 C DE 358652C
Authority
DE
Germany
Prior art keywords
corrosion
rusting
iron
make iron
metals
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
Application number
DEP37889D
Other languages
German (de)
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.)
PERMUTIT AG
Original Assignee
PERMUTIT AG
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 PERMUTIT AG filed Critical PERMUTIT AG
Priority to DEP37889D priority Critical patent/DE358652C/en
Application granted granted Critical
Publication of DE358652C publication Critical patent/DE358652C/en
Expired legal-status Critical Current

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
    • C25D11/38—Chromatising

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Prevention Of Electric Corrosion (AREA)

Description

Verfahren, um Eisen und andere 1VIetalle gegen Rosten und Korrosion widerstandsfähig zu machen. Bekanntlich rostet Eisen im Wasser und an feuchter Luft. Auch andere Metalle unterliegen ähnlichen Oxydations- und Korrosionswirkungen. Diese Erscheinungen treten in noch bedeutend erhöhtem Maße auf, wenn sich die betreffenden Metalle, z. B. Eisen, in leitender Verbindung mit einem elektronegativeren Metall, z. B. Kupfer, befinden.Process to iron and other 1V metals against rusting and corrosion to make resilient. It is well known that iron rusts in water and in moist air. Other metals are also subject to similar oxidation and corrosion effects. These Phenomena appear to an even greater extent when the relevant Metals, e.g. B. iron, in conductive connection with a more electronegative metal, z. B. copper.

Es wurde gefunden, daß Eisen und andere Metalle vor Rostangriff und Korrosion bewahrt bleiben, wenn man sie in einer chromhaltigen Lösung der Einwirkung eines elektrischen Stromes als Kathode aussetzt. Ein beliebiger leitender Körper; auch. Chrommetall selbst, kann in geeigneter Form als Anode dienen.It has been found that iron and other metals are protected from rust and Corrosion is preserved when it is exposed to a chromium-containing solution exposed to an electric current as a cathode. Any conductive body; even. Chromium metal itself, in a suitable form, can serve as an anode.

Nach der Erfindung wird nicht etwa bezweckt, einen merkbaren zusammenhängenden Chromüberzug zu erzeugen. Die Stromstärke wird vielmehr so niedrig gewählt, daß kein Niederschlagen von Chrom stattzufinden braucht.According to the invention is not intended to be a noticeable coherent Generate chrome plating. Rather, the current strength is chosen so low that no precipitation of chromium need take place.

Zur Herstellung der chromhaltigen Badflüssigkeit werden beliebige Chromverbindungen verwendet. Als Beispiele geeigneter neutraler oder schwach saurer Lösungen, die jedoch nach Bedarf auch stärker oder verdünnter zur Anwendung kommen, seien angeführt _. Lösung von xo g Chromalaun und xo g Natriumacetat in 150 g Wasser, 2. i- bis 2prozentige wässerige Chromsäurelösung, 3. mit Schwefelsäure angesäuerte xprozentige Chromsäurelösung, 4. r- bis 4prozentige Kaliumchromat- oder Kaliumbichromatlösung, der so viel freie Schwefelsäure zugesetzt wird, als das vorhandene Kalium zur Bindung benötigt. Beispielsweise wird ein Versuchseisenblech von 2 mm Dicke und 3 X 8 cm Abmessungen in einer z,5prozentigen,Chromsäurelösung der kathodischen Einwirkung des elektrischen Stromes unterworfen, und zwar bei o,4bis 0,5 Ampere und 2,5 Volt 6 Stunden lang. Dann wird das Blech herausgenommen und abgespült. Es zeigt künftig keinerlei Anrostung mehr, weder beim Aufhängen in feuchter Luft noch beim Einhängen in Wasser. Wird ein gleiches Versuchsblech ohne Vorbehandlung in Wasser eingehängt, dann zeigt es schon nach wenigen Minuten durch Schlierenbildung einen Eisenangriff an, und in kurzer Zeit entstehen Rostflecke.Any chromium compounds can be used to produce the chromium-containing bath liquid. Examples of suitable neutral or weakly acidic solutions, which, however, can also be used more strongly or more dilutely as required, are given. Solution of xo g chrome alum and xo g sodium acetate in 150 g water, 2. 1 to 2 percent aqueous chromic acid solution, 3. x percent chromic acid solution acidified with sulfuric acid, 4. 3 to 4 percent potassium chromate or potassium dichromate solution to which as much free sulfuric acid is added, than the existing potassium required for binding. For example, a test iron sheet 2 mm thick and 3 × 8 cm in size in a z.5 percent chromic acid solution is subjected to the cathodic action of the electric current, at 0.4 to 0.5 amperes and 2.5 volts for 6 hours. Then the sheet metal is taken out and rinsed off. In future it will no longer show any rusting, neither when hanging in humid air nor when hanging in water. If the same test sheet is hung in water without pretreatment, it will already show an iron attack after a few minutes by streaking, and rust stains will appear in a short time.

Die Anwendung auf fertige Eisengegenstände zeigt dasselbe günstige Ergebnis. Soweit dieselben in einer chromhaltigen Flüssigkeit der Einwirkung des elektrischen Stromes ausgesetzt waren, bleiben sie dauernd blank, während die nicht eingetauchten Teile Rostüberzug aufweisen.Application to finished iron objects shows the same favorable Result. As far as the same in a chromium-containing liquid of the action of the exposed to electric current, they remain bare permanently, while they are not submerged parts have a rust coating.

Für die Durchführung des Verfahrens ist es vorteilhaft, die Badfiüssigkeit oder eine der beiden Elektroden während des Stromdurchgangs zu bewegen.It is advantageous to use the bath liquid or to move one of the two electrodes while the current is flowing.

Claims (1)

PATENT-ANSPRUGH: Verfahren, Eisen und andere Metalle gegen Rosten und Korrosion widerstandsfähig zu machen, dadurch gekennzeichnet, daß man die zu schützenden Stücke in einer chromhaltigen Lösung einer kathodischen Behandlung aussetzt, ohne jedoch einen merkbaren zusammenhängenden .Chromüberzug zu erzeugen.PATENT-ANSPRUGH: Process, iron and other metals against rusting and to make corrosion resistant, characterized in that one has to subjecting protective pieces to cathodic treatment in a chromium-containing solution, but without producing a noticeable coherent chrome coating.
DEP37889D 1919-06-04 1919-06-04 Process to make iron and other metals resistant to rusting and corrosion Expired DE358652C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEP37889D DE358652C (en) 1919-06-04 1919-06-04 Process to make iron and other metals resistant to rusting and corrosion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP37889D DE358652C (en) 1919-06-04 1919-06-04 Process to make iron and other metals resistant to rusting and corrosion

Publications (1)

Publication Number Publication Date
DE358652C true DE358652C (en) 1922-09-14

Family

ID=7375560

Family Applications (1)

Application Number Title Priority Date Filing Date
DEP37889D Expired DE358652C (en) 1919-06-04 1919-06-04 Process to make iron and other metals resistant to rusting and corrosion

Country Status (1)

Country Link
DE (1) DE358652C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2780592A (en) * 1951-08-22 1957-02-05 Bethlehem Steel Corp Electrolytic treatment of metal surfaces

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2780592A (en) * 1951-08-22 1957-02-05 Bethlehem Steel Corp Electrolytic treatment of metal surfaces

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