GB803405A - Improvements in or relating to the production of corrosion-resistant coatings on aluminium or aluminium-alloys - Google Patents

Improvements in or relating to the production of corrosion-resistant coatings on aluminium or aluminium-alloys

Info

Publication number
GB803405A
GB803405A GB32899/56A GB3289956A GB803405A GB 803405 A GB803405 A GB 803405A GB 32899/56 A GB32899/56 A GB 32899/56A GB 3289956 A GB3289956 A GB 3289956A GB 803405 A GB803405 A GB 803405A
Authority
GB
United Kingdom
Prior art keywords
aluminium
corrosion
production
solution
resistant 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
GB32899/56A
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.)
Henkel Corp
Original Assignee
Amchem Products Inc
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 Amchem Products Inc filed Critical Amchem Products Inc
Publication of GB803405A publication Critical patent/GB803405A/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
    • C23C22/73—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 characterised by the process
    • C23C22/77—Controlling or regulating of the coating process

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

In a process for the production of uniformly-coloured and corrosion-resistant coatings on a succession of aluminium or aluminium-alloy articles by treatment with an acidic solution containing fluoride and hexavalent chromium, preferably together with phosphate and/or arsenates, the "active fluoride" present in the solution is measured and maintained constant. The "active fluoride" content may be determined by measuring the weight-loss suffered by a piece of glass on immersion in the solution for a given time at a definite temperature, or by any other commensurate means, e.g. by measuring the amount of powdered silica dissolved by the solution under chosen conditions of time and temperature. The example discloses the replenishment with sodium bifluoride of an aqueous solution containing sodium bifluoride, chromic acid and phosphoric acid. The concentrations of hexavalent chromium and of phosphate and/or arsenate are maintained by conventional means. Specifications 632,090, 632,097 and 708,937 are referred to.
GB32899/56A 1956-05-23 1956-10-29 Improvements in or relating to the production of corrosion-resistant coatings on aluminium or aluminium-alloys Expired GB803405A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US586646A US2814577A (en) 1956-05-23 1956-05-23 Method of producing corrosion resistant coatings of uniform color and appearnce on asuccession of aluminum pieces

Publications (1)

Publication Number Publication Date
GB803405A true GB803405A (en) 1958-10-22

Family

ID=24346583

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32899/56A Expired GB803405A (en) 1956-05-23 1956-10-29 Improvements in or relating to the production of corrosion-resistant coatings on aluminium or aluminium-alloys

Country Status (6)

Country Link
US (1) US2814577A (en)
BE (1) BE555607A (en)
DE (1) DE1112370B (en)
FR (1) FR1157610A (en)
GB (1) GB803405A (en)
NL (2) NL97942C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1242973B (en) * 1959-12-17 1967-06-22 Amchem Prod Process for the production of chemical conversion coatings on aluminum surfaces
US5462634A (en) * 1991-08-23 1995-10-31 Honda Giken Kogyo Kabushiki Kaisha Surface-treated aluminum material and method for its surface treatment

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3140245A (en) * 1961-08-23 1964-07-07 Gallaccio Anthony Dulling hard aluminum oxide coatings on aluminum-rich basis metals

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE467610A (en) * 1945-06-30
US2438877A (en) * 1945-09-06 1948-03-30 American Chem Paint Co Composition for and method of coating aluminum
US2487137A (en) * 1947-09-10 1949-11-08 Armco Steel Corp Producing coatings on metal
US2679752A (en) * 1949-11-25 1954-06-01 Socony Vacuum Oil Co Inc Method for measuring corrosivity of fluids

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1242973B (en) * 1959-12-17 1967-06-22 Amchem Prod Process for the production of chemical conversion coatings on aluminum surfaces
US5462634A (en) * 1991-08-23 1995-10-31 Honda Giken Kogyo Kabushiki Kaisha Surface-treated aluminum material and method for its surface treatment

Also Published As

Publication number Publication date
BE555607A (en) 1957-03-30
NL210440A (en)
US2814577A (en) 1957-11-26
NL97942C (en) 1961-05-15
FR1157610A (en) 1958-06-02
DE1112370B (en) 1961-08-03

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