GB626239A - Improvements in or relating to the removal of stains and coatings from the surfaces of metals - Google Patents

Improvements in or relating to the removal of stains and coatings from the surfaces of metals

Info

Publication number
GB626239A
GB626239A GB779347A GB779347A GB626239A GB 626239 A GB626239 A GB 626239A GB 779347 A GB779347 A GB 779347A GB 779347 A GB779347 A GB 779347A GB 626239 A GB626239 A GB 626239A
Authority
GB
United Kingdom
Prior art keywords
metal
solution
cyanide
stains
coatings
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
GB779347A
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Priority to GB779347A priority Critical patent/GB626239A/en
Publication of GB626239A publication Critical patent/GB626239A/en
Expired legal-status Critical Current

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)
  • Cosmetics (AREA)

Abstract

626,239. Cleaning by electrolysis. BRITTON, ,J. W., and IMPERIAL CHEMICAL INDUSTRIES, Ltd. March 21, 1947, No. 7793. [Class 41] Stains and coatings are removed from the surface of iron and steel articles by immersing them in an alkali metal cyanide solution, e.g. in concentrations of from 1 to 10 per cent and preferably from 4 to 6 per cent by weight of the cyanide at a temperature of from 10‹ to 70‹ C. and preferably from 45‹ to 55‹ C., in which metallic zinc or aluminium or an alloy of zinc or aluminium is also immersed while electrical contact is maintained between the articles and the metal or alloy specified. The electrical contact between the article and the metal in the solution may be made externally, e.g. by means of a wire conductor or internally by allowing the metal article to touch each other under the surface of the solution. The metal may be in rod, sheet or granulated or powdered form and in the latter case the mixture of metallic powder and solution must be stirred. Several examples are given employing sodium cyanide solutions and metallic zinc.
GB779347A 1947-03-21 1947-03-21 Improvements in or relating to the removal of stains and coatings from the surfaces of metals Expired GB626239A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB779347A GB626239A (en) 1947-03-21 1947-03-21 Improvements in or relating to the removal of stains and coatings from the surfaces of metals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB779347A GB626239A (en) 1947-03-21 1947-03-21 Improvements in or relating to the removal of stains and coatings from the surfaces of metals

Publications (1)

Publication Number Publication Date
GB626239A true GB626239A (en) 1949-07-12

Family

ID=9839844

Family Applications (1)

Application Number Title Priority Date Filing Date
GB779347A Expired GB626239A (en) 1947-03-21 1947-03-21 Improvements in or relating to the removal of stains and coatings from the surfaces of metals

Country Status (1)

Country Link
GB (1) GB626239A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150114845A1 (en) * 2013-10-29 2015-04-30 Westinghouse Electric Company Llc Targeted heat exchanger deposit removal by combined dissolution and mechanical removal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150114845A1 (en) * 2013-10-29 2015-04-30 Westinghouse Electric Company Llc Targeted heat exchanger deposit removal by combined dissolution and mechanical removal
US9334579B2 (en) * 2013-10-29 2016-05-10 Westinghouse Electric Company Llc Targeted heat exchanger deposit removal by combined dissolution and mechanical removal
US10309032B2 (en) 2013-10-29 2019-06-04 Westinghouse Electric Company Llc Targeted heat exchanger deposit removal by combined dissolution and mechanical removal

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