GB565567A - Improvements in and relating to the removal of surface impurities from metals by fused alkali baths - Google Patents
Improvements in and relating to the removal of surface impurities from metals by fused alkali bathsInfo
- Publication number
- GB565567A GB565567A GB1450242A GB1450242A GB565567A GB 565567 A GB565567 A GB 565567A GB 1450242 A GB1450242 A GB 1450242A GB 1450242 A GB1450242 A GB 1450242A GB 565567 A GB565567 A GB 565567A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bath
- sodium
- ammonia
- alkali metal
- 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
Links
Classifications
-
- 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
- C23G1/28—Cleaning or pickling metallic material with solutions or molten salts with molten salts
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
565,567. Cleaning metals. DU PONT DE NEMOURS & CO., E. I., and GILBERT, H. N.. Oct. 16, 1942, No. 14502. [Class 82 (ii)] [Also in Group III] Metal articles are cleaned by contacting them with a molten composition comprising one or more alkali metal hydroxides containing dissolved alkali metal amide. The surface of the bath is protected from oxidation either by passing a stream of ammonia gas which may be mixed with non-oxidizing or inert gases, such as nitrogen or hydrogen into the bath or by the use of a floating layer of solid insoluble material thereon such as charcoal or graphite. The bath may comprise sodium hydroxide'with or without diluents such as borax, cyanides, strontium or barium chlorides, and 1-25 per cent by weight of sodamide with or without up to 20 per cent by weight of sodium hydride. After treatment with the bath, the articles are quenched in water. The composition may be produced by the interaction of ammonia with alkali metal oxide dissolved in a fixed mass of alkali hydroxide or by floating a layer of molten sodium on the surface of fused caustic soda and passing in ammonia so that it comes 'in contact with the sodium at the interface between the sodium and caustic layers. If hydrogen is mixed with the ammonia, sodium hydride is also produced in the bath. The cleaning of iron sheet articles and of non- ferrous metals and alloys, such as copper and nickel, is referred to. Specification 557,530 is referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1450242A GB565567A (en) | 1942-10-16 | 1942-10-16 | Improvements in and relating to the removal of surface impurities from metals by fused alkali baths |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1450242A GB565567A (en) | 1942-10-16 | 1942-10-16 | Improvements in and relating to the removal of surface impurities from metals by fused alkali baths |
Publications (1)
Publication Number | Publication Date |
---|---|
GB565567A true GB565567A (en) | 1944-11-16 |
Family
ID=10042357
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1450242A Expired GB565567A (en) | 1942-10-16 | 1942-10-16 | Improvements in and relating to the removal of surface impurities from metals by fused alkali baths |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB565567A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3544368A (en) * | 1968-11-30 | 1970-12-01 | Degussa | Process and the descaling of metals |
US6059887A (en) * | 1997-04-03 | 2000-05-09 | Purex Co., Ltd. | Process for cleaning the interior of semiconductor substrate |
-
1942
- 1942-10-16 GB GB1450242A patent/GB565567A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3544368A (en) * | 1968-11-30 | 1970-12-01 | Degussa | Process and the descaling of metals |
US6059887A (en) * | 1997-04-03 | 2000-05-09 | Purex Co., Ltd. | Process for cleaning the interior of semiconductor substrate |
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