GB1024926A - Improvements relating to the chromating of aluminium - Google Patents

Improvements relating to the chromating of aluminium

Info

Publication number
GB1024926A
GB1024926A GB28666/64A GB2866664A GB1024926A GB 1024926 A GB1024926 A GB 1024926A GB 28666/64 A GB28666/64 A GB 28666/64A GB 2866664 A GB2866664 A GB 2866664A GB 1024926 A GB1024926 A GB 1024926A
Authority
GB
United Kingdom
Prior art keywords
concentration
chromium
tellunum
compound
alkali metal
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
GB28666/64A
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.)
Pyrene Co Ltd
Original Assignee
Pyrene Co 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 Pyrene Co Ltd filed Critical Pyrene Co Ltd
Publication of GB1024926A publication Critical patent/GB1024926A/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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/34—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
    • C23C22/37—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides containing also hexavalent chromium compounds

Landscapes

  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)

Abstract

A process of chromate coating Al or Al alloy surfaces by treating the surface with an aqueous acidic solution containing hexavalent chromium, a fluoride and a soluble tellunum compound. The chromium may be in the form of chromic acid or its salts e.g. alkali metal chromates or dichromates in a concentration of 0.5 to 50 g.p.l. The fluoride ion may be in the form of one or several of hydrofluoric, fluorosilicic and fluoroboric acids and alkali metal, Ba or ammonium salts of these acids in a concentration of 0.1-7.0 g.p.l. The tellunum compound may be H2TeO4, Na, K or ammonium salts of telluric or tellurous acid in a concentration of 0.15-7.5 g.p.l. measured as TeO2 and preferably less than the amount of chromium measured as CrO3 . 0.5-30 g.p.l. of nitric acid may be added e.g. in the form of nitrate, the solution having a pH of 0.5-2.5. The process is carried out preferably at 110-165 DEG F. and can be used continuously for coating strip metal when an ion exchange unit may be used. The surface may first be cleaned of oil, grease or oxide and the solution applied by dipping, brushing or spraying.
GB28666/64A 1963-07-11 1964-07-10 Improvements relating to the chromating of aluminium Expired GB1024926A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US294272A US3329536A (en) 1963-07-11 1963-07-11 Solution and accelerated process for coating aluminum

Publications (1)

Publication Number Publication Date
GB1024926A true GB1024926A (en) 1966-04-06

Family

ID=23132660

Family Applications (1)

Application Number Title Priority Date Filing Date
GB28666/64A Expired GB1024926A (en) 1963-07-11 1964-07-10 Improvements relating to the chromating of aluminium

Country Status (7)

Country Link
US (1) US3329536A (en)
BE (1) BE647491A (en)
CH (1) CH476858A (en)
DE (1) DE1239165B (en)
GB (1) GB1024926A (en)
NL (1) NL6407787A (en)
SE (1) SE305106B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3531384A (en) * 1962-02-24 1970-09-29 Katsuya Inouye Process of treating surfaces of metallic articles
US5407747A (en) * 1992-01-15 1995-04-18 Morton International, Inc. Filiform corrosion resistant aluminum automotive road wheel

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3380858A (en) * 1964-11-10 1968-04-30 Hooker Chemical Corp Chromate coating composition for aluminum and process
EP0487200B1 (en) * 1990-11-14 2000-06-21 Titeflex Corporation Fluoropolymer aluminium laminate

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2322205A (en) * 1939-05-01 1943-06-22 Dow Chemical Co Method of treating magnesium and its alloys
US2522474A (en) * 1942-07-02 1950-09-12 Battelle Memorial Institute Treatment of zinc surfaces
US2438740A (en) * 1944-03-27 1948-03-30 Canadian Copper Refiners Ltd Method of protecting the surface of articles formed from a magnesium alloy
GB577731A (en) * 1944-08-17 1946-05-29 High Duty Alloys Ltd Improved process for protecting magnesium and magnesium rich alloys against corrosion
US2507956A (en) * 1947-11-01 1950-05-16 Lithographic Technical Foundat Process of coating aluminum
US2613165A (en) * 1950-07-03 1952-10-07 Aluminum Co Of America Surface treatment of magnesium and magnesium alloy articles
US2786002A (en) * 1954-04-28 1957-03-19 American Chem Paint Co Method of treating zinciferous surfaces
US2904413A (en) * 1954-06-23 1959-09-15 Jervis Corp Process of bright dipping zinc base alloys
GB889322A (en) * 1960-11-07 1962-02-14 Pyrene Co Ltd Improvements relating to the chromating of zinc and cadmium
GB990352A (en) * 1963-08-15 1965-04-28 Pyrene Co Ltd Improvements relating to the chromating of aluminium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3531384A (en) * 1962-02-24 1970-09-29 Katsuya Inouye Process of treating surfaces of metallic articles
US5407747A (en) * 1992-01-15 1995-04-18 Morton International, Inc. Filiform corrosion resistant aluminum automotive road wheel

Also Published As

Publication number Publication date
CH476858A (en) 1969-08-15
BE647491A (en) 1964-08-31
DE1239165B (en) 1967-04-20
SE305106B (en) 1968-10-14
US3329536A (en) 1967-07-04
NL6407787A (en) 1965-01-12

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