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 baths

Info

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
Application number
GB1450242A
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Priority to GB1450242A priority Critical patent/GB565567A/en
Publication of GB565567A publication Critical patent/GB565567A/en
Expired legal-status Critical Current

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.
GB1450242A 1942-10-16 1942-10-16 Improvements in and relating to the removal of surface impurities from metals by fused alkali baths Expired GB565567A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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