GB787841A - Treatment of ferrous metal surfaces and composition therefor - Google Patents

Treatment of ferrous metal surfaces and composition therefor

Info

Publication number
GB787841A
GB787841A GB6277/54A GB627754A GB787841A GB 787841 A GB787841 A GB 787841A GB 6277/54 A GB6277/54 A GB 6277/54A GB 627754 A GB627754 A GB 627754A GB 787841 A GB787841 A GB 787841A
Authority
GB
United Kingdom
Prior art keywords
acid
bentonite
paste
less
anions
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
GB6277/54A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB787841A publication Critical patent/GB787841A/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
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/025—Cleaning or pickling metallic material with solutions or molten salts with acid solutions acidic pickling pastes

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)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Pigments, Carbon Blacks, Or Wood Stains (AREA)

Abstract

Scale is removed from ferrous surfaces by applying thereto a paste comprising a finely-divided inert mineral carrier and an aqueous solution containing at least one substance yielding in aqueous solution an oxidizing anion, the pH of the solution being less than 10, and subsequently removing the reacted paste. Where the pH of the solution used is such that the oxidizing anion therein produces a partial pressure of oxygen greater than 1 atmosphere and also yields by reduction insoluble products which would otherwise render the ferrous surface passive, there is added to the paste an electrolyte in the form of a water-soluble salt or acid, the said salt or acid having a dissociation constant greater than 0.01, being reactive towards iron (iron electrode potential in its aqueous solution less than 0) and having an rH value of 27-41 and if the acid used is one having a pH less than 2.5, then the acid being diluted so that not more than 1 per cent by weight of such acid is present in the paste. Where the pH of the solution used is such that the oxidizing anion therein produces a partial pressure of oxygen less than 1 atmosphere, there is added to the paste an electrolyte in the form of a non-reducing mineral acid having a pH less than 2.5, preferably sulphuric acid. The mineral carrier is preferably silica or an insoluble silicate, e.g. clay, kaolin, talc, bentonite, or ground shells. The preferred oxidizing anions are those which change colour when reduced and which are salts of potassium, sodium or ammonium. In suitable pH ranges the anions MnO4, ClO, ClO4 and Cr2O7 produce a partial pressure of oxygen greater than 1 atmosphere: examples of water-soluble salts and acids which are added when such anions produce insoluble products are sulphates, acetates and pyrophosphates of alkali metals and ammonium, acetic acid, nitrous acid and sulphuric acid. In suitable pH ranges the anions CrO4, Cr2O7 NO3, NO2, ClO3 and ClO4 produce a partial pressure of oxygen less than 1 atmosphere. Paste compositions given in the examples comprise (1) bentonite, potassium permanganate and ammonium sulphate, (2) bentonite, kaolin, potassium permanganate, acetic acid and sodium acetate, (3) bentonite, silica, sodium hypochlorite and ammonium bisulphate, (4) bentonite, sodium dichromate, and sulphuric acid, and (5) bentonite, kaolin, potassium permanganate and sulphuric acid.
GB6277/54A 1953-03-05 1954-03-03 Treatment of ferrous metal surfaces and composition therefor Expired GB787841A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR643999 1953-03-05
FR650521 1953-06-24

Publications (1)

Publication Number Publication Date
GB787841A true GB787841A (en) 1957-12-18

Family

ID=45373860

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6277/54A Expired GB787841A (en) 1953-03-05 1954-03-03 Treatment of ferrous metal surfaces and composition therefor

Country Status (6)

Country Link
US (1) US3073726A (en)
BE (1) BE526720A (en)
CH (1) CH320340A (en)
DE (1) DE1191657B (en)
FR (3) FR1075489A (en)
GB (1) GB787841A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3275560A (en) * 1962-05-23 1966-09-27 Eutectic Welding Alloys Metal cleaning paste
DE3622505A1 (en) * 1986-07-04 1988-01-14 Pelox Chemietechnik Gmbh Co Kg Pickling agent for iron and aluminium materials
GB2214925B (en) * 1988-02-01 1991-09-18 Ecc Int Ltd A method of thickening an aqueous solution of an acid

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2735818A (en) * 1956-02-21 Scale removal
US1428084A (en) * 1921-06-04 1922-09-05 James H Gravell Cleaner for and method of cleaning metal
US1553881A (en) * 1924-03-11 1925-09-15 Siegel Heinrich Composition for removing rust from and cleansing steel and iron
US1729765A (en) * 1925-02-11 1929-10-01 Clarence F Dinley Removal of foreign substances from metal surfaces
DE466077C (en) * 1925-11-08 1928-10-01 Zoellner Werke Akt Ges Fuer Fa Rust removal agent
DE523505C (en) * 1927-07-26 1931-04-24 I G Farbenindustrie Akt Ges Process for cleaning metal surfaces
US2158992A (en) * 1936-06-23 1939-05-16 Wheeling Steel Corp Method and solution for pickling and cleaning metal
US2220451A (en) * 1938-02-09 1940-11-05 Du Pont Composition
DE740432C (en) * 1938-10-14 1943-10-20 Schering Ag Process for pickling iron and iron alloys
DE742477C (en) * 1940-07-20 1943-12-04 Paul Effing Rust removal agent for removing rust from iron-containing body surfaces
US2431728A (en) * 1942-04-29 1947-12-02 Despo Mfg Co Ltd Treatment of ferrous metals to improve resistance to rusting
US2368955A (en) * 1942-05-18 1945-02-06 Sharon Steel Corp Treatment of manganese steel
US2538702A (en) * 1944-06-02 1951-01-16 Freeport Sulphur Co Metal surface cleaning
US2564549A (en) * 1945-07-02 1951-08-14 Albert R Stargardter Pickling treatment
US2428804A (en) * 1945-09-07 1947-10-14 Esther M Terry Copper cleaning composition
BE471054A (en) * 1946-02-08
US2501145A (en) * 1947-06-18 1950-03-21 Smith Nathan Composition for release of oxygen
US2554358A (en) * 1948-10-16 1951-05-22 Birco Chemical Corp Composition for cleaning metals
CH273080A (en) * 1949-04-02 1951-01-31 Santi & Co H Means for removing rust from metallic objects.
US2672449A (en) * 1949-09-15 1954-03-16 Foster D Snell Inc Composition for cleaning metal

Also Published As

Publication number Publication date
DE1191657B (en) 1965-04-22
US3073726A (en) 1963-01-15
FR1075489A (en) 1954-10-18
FR1085422A (en) 1955-02-02
BE526720A (en) 1956-08-31
CH320340A (en) 1957-03-31
FR63845E (en) 1955-10-03

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