DE976436C - Pickling of metal surfaces - Google Patents
Pickling of metal surfacesInfo
- Publication number
- DE976436C DE976436C DES25962A DES0025962A DE976436C DE 976436 C DE976436 C DE 976436C DE S25962 A DES25962 A DE S25962A DE S0025962 A DES0025962 A DE S0025962A DE 976436 C DE976436 C DE 976436C
- Authority
- DE
- Germany
- Prior art keywords
- cyanamide
- pickling
- metal surfaces
- dichlorohydrate
- solution
- 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
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/32—Organic compounds containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Wood Science & Technology (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
Description
Bekanntlich kann das Dichlorhydrat des Cyanamids durch Einwirkung von gasförmiger Chlorwasserstoffsäure auf das Cyanamid in ätherischer oder alkoholischer Lösung erhalten werden. Es stellt eine kristalline Substanz dar, die ohne besondere Vorsichtsmaßnahmen aufbewahrt werden kann.It is known that the dichlorohydrate of cyanamide can be caused by the action of gaseous hydrochloric acid on the cyanamide can be obtained in ethereal or alcoholic solution. It puts is a crystalline substance that can be stored without special precautions.
Es wurde gefunden, daß die Lösung dieses Stoffes in Wasser eine vorzügliche Beizwirkung besitzt. Diese Eigenschaft erklärt sich vielleicht als Folge einer Hydrolyse des Cyanamid-dichlorhydrats, bei welcher Chlorwasserstoffsäure und Cyanamid entsteht, beides Stoffe, die in merklichem Maße lösend auf Rost und die anderen Metalloxyde wirken.It has been found that the solution of this substance in water has an excellent pickling effect owns. This property can be explained as a result of hydrolysis of the cyanamide dichlorohydrate, at which hydrochloric acid and cyanamide are formed, both substances which in noticeable Measures dissolving effect on rust and the other metal oxides.
Gemäß der Erfindung kann das Cyanamiddichlorhydrat in wäßriger Lösung, entweder in reinem Zustande oder in Mischung mit den verschiedensten aufsaugend wirkenden Mitteln, wie Infusorienerde, Walkerde, Sägespänen usw. verwendet werden, wobei die Anteile der Mischungsbestandteile von dem Verwendungszweck des Erzeugnisses abhängen.According to the invention, the cyanamide dichlorohydrate in aqueous solution, either in pure or mixed with the most varied of absorbent agents, such as Infusorie earth, fulling earth, sawdust, etc. are used, with the proportions of the mixture components depend on the intended use of the product.
Aus der USA.-Patentschrift 2 335 452 ist es bereits bekannt, Metalloberflächen mit einer wäßrigen Säure, z. B. Salzsäure, zu beizen, die einen auf Ammoniumthiocyanat oder Thioharnstoff niedergeschlagenen Kunststoff, z. B. ein Kondensationsprodukt aus Phenol und Formaldehyd oder aus From US Pat. No. 2,335,452 it is already known to coat metal surfaces with an aqueous Acid, e.g. B. hydrochloric acid to pickle, the one precipitated on ammonium thiocyanate or thiourea Plastic, e.g. B. a condensation product of phenol and formaldehyde or from
309 675/6309 675/6
Cyanamid und einer weiteren geeigneten Komponente, sowie gegebenenfalls ein Verdickungsmittel zur Verhinderung bzw. Verminderung der Korrosion enthält. Gegenüber diesem Stand der Technik besteht der Fortschritt im wesentlichen darin, daß die ernndungsgemäß verwendete Lösung sich ohne Schwierigkeit durch einfaches Lösen desCyanamiddichlorhydrats, das bekanntlich leicht aus Cyanamid und Chlorwasserstoff gewonnen werden kann und ίο das sich als trockenes Produkt bequem verpacken, transportieren und lagern läßt, in Wasser hergestellt werden kann.Cyanamide and another suitable component, and optionally a thickener to prevent or reduce corrosion. Compared to this state of the art The progress consists essentially in the fact that the solution used according to the invention can be used without Difficulty by simply dissolving the cyanamide dichlorohydrate, which is known to be easily obtained from cyanamide and hydrogen chloride and ίο that can be conveniently packaged, transported and stored as a dry product, made in water can be.
Nachstehend werden einige Beispiele gegeben:Some examples are given below:
In ioo 1 Äthylazetat, die 21 kg freies Cyanamid gelöst enthalten, werden 36,5 kg gasförmige Chlorwasserstoffsäure eingeleitet, wobei durch Kühlung verhindert wird, daß die Temperatur 500 C übersteigt. Das Cyanamid-dichlorhydrat fällt aus und wird durch Filtern getrennt. Man erhält 61 kg Salz, welches noch eine kleine Menge an Lösungsmittel enthält. Dieses Lösungsmittel kann durch Trocknungabgeschiedenwerden, jedoch ist es ingewissen Fällen empfehlenswert, auf eine Abtrennung desselben zu verzichten, weil es eine unter Umständen vorteilhafte entfettende Wirkung besitzt.36.5 kg of gaseous hydrochloric acid are introduced into 100 1 of ethyl acetate containing 21 kg of free cyanamide in solution, the temperature being prevented from exceeding 50 ° C. by cooling. The cyanamide dichlorohydrate precipitates and is separated by filtering. 61 kg of salt are obtained, which still contain a small amount of solvent. This solvent can be separated off by drying, but in certain cases it is advisable not to separate it off because it has a degreasing effect which may be advantageous.
In Wasser gelöst kann das erhaltene Produkt zum Beizen von Metallen verwendet werden.When dissolved in water, the product obtained can be used for pickling metals.
Das nach dem Beispiel I hergestellte Cyanamiddichlorhydrat wird mit der gleichen Menge an natürlicher pulverisierter Kieselerde gemischt. Wenn das ursprüngliche Lösungsmittel nicht ausgetrieben worden ist, ergibt sich eine Paste, die nach Zusatz von Wasser zum Beizen von Metallen verwendet werden kann.The cyanamide dichlorohydrate prepared according to Example I is with the same amount of natural powdered silica mixed. If the original solvent is not expelled The result is a paste which, after adding water, is used for pickling metals can be used.
Claims (1)
USA.-Patentschriften Nr. 2043257, 2335452.Considered publications:
U.S. Patent Nos. 2043257, 2335452.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR600243 | 1950-11-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE976436C true DE976436C (en) | 1963-09-05 |
Family
ID=8693777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DES25962A Expired DE976436C (en) | 1950-11-22 | 1951-11-20 | Pickling of metal surfaces |
Country Status (6)
| Country | Link |
|---|---|
| BE (1) | BE507314A (en) |
| CH (1) | CH296678A (en) |
| DE (1) | DE976436C (en) |
| FR (1) | FR1028257A (en) |
| GB (1) | GB707928A (en) |
| NL (1) | NL78625C (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2043257A (en) * | 1933-10-09 | 1936-06-09 | Stauffer Chemical Co | Preservation of chlorinated hydrocarbons |
| US2335452A (en) * | 1939-06-10 | 1943-11-30 | Schelling Franz | Inhibitor for acid pickling baths and process of making |
-
1950
- 1950-11-22 FR FR1028257D patent/FR1028257A/en not_active Expired
-
1951
- 1951-11-07 NL NL165196A patent/NL78625C/xx active
- 1951-11-19 GB GB2712151A patent/GB707928A/en not_active Expired
- 1951-11-20 DE DES25962A patent/DE976436C/en not_active Expired
- 1951-11-22 BE BE507314D patent/BE507314A/xx unknown
- 1951-11-22 CH CH296678D patent/CH296678A/en unknown
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2043257A (en) * | 1933-10-09 | 1936-06-09 | Stauffer Chemical Co | Preservation of chlorinated hydrocarbons |
| US2335452A (en) * | 1939-06-10 | 1943-11-30 | Schelling Franz | Inhibitor for acid pickling baths and process of making |
Also Published As
| Publication number | Publication date |
|---|---|
| CH296678A (en) | 1954-02-28 |
| FR1028257A (en) | 1953-05-20 |
| GB707928A (en) | 1954-04-28 |
| NL78625C (en) | 1955-08-15 |
| BE507314A (en) | 1952-05-23 |
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