DE1012137B - Process for the electrolytic descaling of lightly scaled iron materials in alkaline solutions - Google Patents
Process for the electrolytic descaling of lightly scaled iron materials in alkaline solutionsInfo
- Publication number
- DE1012137B DE1012137B DED19674A DED0019674A DE1012137B DE 1012137 B DE1012137 B DE 1012137B DE D19674 A DED19674 A DE D19674A DE D0019674 A DED0019674 A DE D0019674A DE 1012137 B DE1012137 B DE 1012137B
- Authority
- DE
- Germany
- Prior art keywords
- lightly
- alkaline solutions
- electrolytic descaling
- iron materials
- scaled
- 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.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
- C25F1/02—Pickling; Descaling
- C25F1/04—Pickling; Descaling in solution
- C25F1/06—Iron or steel
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Description
Verfahren zum elektrolytischen Entzundern leicht gezunderter Eisenwerkstoffe in alkalischen Lösungen Die Erfindung betrifft ein Verfahren zum elektro-Iytischen alkalischen Entzundern leicht gezunderter Eisenwerkstoffe.Process for the electrolytic descaling of lightly scaled ferrous materials in alkaline solutions The invention relates to a method for electro-lytic alkaline descaling of slightly scaled iron materials.
Um leichten Zunder (Anlaufzunder, Kaltwalzzunder) von legierten und nicht legierten Eisenwerkstoffen zu entfernen, verwendet man außer Säure-Bädern, die chemisch oder elektrolytisch betrieben werden können, auch verschiedene alkalische Bäder, die ebenfalls chemisch oder elektrochemisch arbeiten. Diese alkalischen Bäder, soweit sie elektrochemisch betrieben werden, weisen meist einen Verbrauch an Chemikalien auf (üblicherweise NaOH -f- Na C N) . Soweit ein Chemikalienverbrauch nicht vorliegt, kommen 50%ige, also konzentrierte Laugen in Anwendung. Die Schaltungsart ist bei letzterem Verfahren im wesentlichen anodisch, bei dem anderen Verfahren dagegen vorwiegend kathodisch.To light scale (tarnish, cold rolling scale) from alloyed and To remove non-alloyed ferrous materials, apart from acid baths, which can be operated chemically or electrolytically, including various alkaline ones Baths that also work chemically or electrochemically. These alkaline baths, as far as they are operated electrochemically, they usually show a consumption of chemicals on (usually NaOH -f- Na C N). If there is no chemical consumption, 50%, i.e. concentrated, alkalis are used. The circuit type is at the latter process is essentially anodic, while the other process is essentially anodic predominantly cathodic.
Gemäß der Erfindung wurde nun festgestellt, daß bei leicht gezundertem Material ein elektrolytisches Entzundern in einem Bad folgender Zusammensetzung möglich ist: 10 bis 30°/o, vorzugsweise 20% Natronlauge, 2 bis 8 %, vorzugsweise 5 0/a Alkali-Ferrocyanid, 0 bis 51/9, vorzugsweise 0,5% Natriumchlorid, Rest Wasser.According to the invention it has now been found that with slightly scaled Material an electrolytic descaling in a bath of the following composition possible: 10 to 30%, preferably 20% sodium hydroxide solution, 2 to 8%, preferably 50 / a alkali ferrocyanide, 0 to 51/9, preferably 0.5% sodium chloride, remainder water.
Die Temperatur beträgt etwa 60 bis 80° C, vorzugsweise 70°, die Stromdichte 2 bis 10 A/dm2, zweckmäßig in bekannter Weise unter häufiger Umpolung des Werkstückes. Die Schaltperiode beträgt etwa 10 bis 30, vorzugsweise 15 Sekunden, die Behandlungsdauer 2 bis 5, vorzugsweise 3 Minuten.The temperature is about 60 to 80 ° C., preferably 70 °, the current density 2 to 10 A / dm2, expediently in a known manner with frequent polarity reversal of the workpiece. The switching period is about 10 to 30, preferably 15 seconds, the duration of the treatment 2 to 5, preferably 3 minutes.
Hinsichtlich der Verwendung von Alkali-Ferrocyanid statt Alkalicyanid wird gemäß der Erfindung das Bad gewissermaßen in den Zustand versetzt, bei dem man es bisher als verbraucht betrachtete. Das erfindungsgemäße Verfahren jedoch bietet für leicht gezundertes Material, wo man bisher auch nur mit Alkalicyanid arbeitete, zunächst den Vorteil, daß eine derart giftige Substanz wie Alkalicyanid nicht mehr zur Verwendung gelangt, so daß umfangreiche Vorsichtsmaßnahmen wegfallen können. Trotzdem ist die Behandlungsdauer mit 2 bis 5 Minuten überraschend kurz. Darüber hinaus findet ein Chemikalienverbrauch nicht statt.Regarding the use of alkali ferrocyanide instead of alkali cyanide according to the invention, the bath is to a certain extent placed in the state in which it was previously considered to have been used up. The method according to the invention, however offers for lightly scaled material, where previously only alkali cyanide was used worked, initially the advantage that such a toxic substance as alkali cyanide is no longer used, so that extensive precautionary measures are omitted can. Nevertheless, the treatment time is surprisingly short at 2 to 5 minutes. In addition, there is no consumption of chemicals.
Das Beizgut zeigt am Ende der Behandlung eine hellbraune Überzugsschicht, die nach dem Abspülen der anhaftenden Beizlösung mit verdünnter Salpetersäure unter Bürsten entfernt werden kann, wobei eine völlig blanke metallische Oberfläche zutage tritt. Aus der Beizlösung flockt nach einiger Zeit Eisenhydrooxyd aus, das sich durch Abfiltern entfernen läßt.At the end of the treatment, the pickling material shows a light brown coating, after rinsing off the adhering pickling solution with dilute nitric acid Brushes can be removed, revealing a completely bare metallic surface occurs. After a while, iron hydroxide flocculates from the pickling solution and can be removed by filtering.
Das Verfahren läßt sich beispielsweise beim Banddurchlaufbeizen auch als Mittelleiterverfahren ausbilden. Als Werkstoff für die Gegenelektrode kann in jedem Falle Eisen oder Magnetit dienen.The process can also be used, for example, for continuous strip pickling train as a middle conductor method. The material for the counter electrode can be in iron or magnetite serve in each case.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DED19674A DE1012137B (en) | 1955-01-31 | 1955-01-31 | Process for the electrolytic descaling of lightly scaled iron materials in alkaline solutions |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DED19674A DE1012137B (en) | 1955-01-31 | 1955-01-31 | Process for the electrolytic descaling of lightly scaled iron materials in alkaline solutions |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1012137B true DE1012137B (en) | 1957-07-11 |
Family
ID=7036456
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DED19674A Pending DE1012137B (en) | 1955-01-31 | 1955-01-31 | Process for the electrolytic descaling of lightly scaled iron materials in alkaline solutions |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE1012137B (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE814231C (en) * | 1947-06-06 | 1951-09-20 | Larive Derustit Sarl Soc Fr | Process for cleaning and pickling of metals and device for carrying out the process |
-
1955
- 1955-01-31 DE DED19674A patent/DE1012137B/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE814231C (en) * | 1947-06-06 | 1951-09-20 | Larive Derustit Sarl Soc Fr | Process for cleaning and pickling of metals and device for carrying out the process |
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