GB601736A - Improvements in and relating to the production of protective coatings on aluminium-alloy surfaces - Google Patents

Improvements in and relating to the production of protective coatings on aluminium-alloy surfaces

Info

Publication number
GB601736A
GB601736A GB23435/45A GB2343545A GB601736A GB 601736 A GB601736 A GB 601736A GB 23435/45 A GB23435/45 A GB 23435/45A GB 2343545 A GB2343545 A GB 2343545A GB 601736 A GB601736 A GB 601736A
Authority
GB
United Kingdom
Prior art keywords
aluminium
chromate
litre sodium
alloys
litre
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
GB23435/45A
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.)
WALTER RAYMOND MEYER
Original Assignee
WALTER RAYMOND MEYER
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 WALTER RAYMOND MEYER filed Critical WALTER RAYMOND MEYER
Publication of GB601736A publication Critical patent/GB601736A/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
    • C23C22/60—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 alkaline aqueous solutions with pH greater than 8
    • C23C22/66—Treatment of aluminium or alloys based thereon
    • C23C22/67—Treatment of aluminium or alloys based thereon with solutions containing hexavalent chromium

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

Protective coatings are produced on aluminium or its alloys by treating with a hot aqueous solution of the chlorite, chromate and carbonate of an alkali metal e.g. sodium. The temperature of the solution is preferably between 200 DEG F. and its boiling point, whilst the chromate radical may be supplied in the form of an alkali metal bichromate. The aluminium or alloy surface is preferably first cleaned with a hot solution of trisodium phosphate or caustic soda followed by dipping in strong (50 per cent or more) nitric acid. Examples of the treatment applied to aluminium, alloys of aluminium with manganese, magnesium or chromium are given in which the preferred solution consists of 5 gm/litre sodium chloride, 5-6 gm/litre sodium chromate and 20 gm/litre sodium carbonate; whilst in treating copper-containing aluminium alloys the preferred solution consists of 4-16 gm/litre sodium chlorite, 4-5 gm/litre sodium chromate and 12-16 gm/litre sodium carbonate.
GB23435/45A 1944-09-14 1945-09-11 Improvements in and relating to the production of protective coatings on aluminium-alloy surfaces Expired GB601736A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US554147A US2460897A (en) 1944-09-14 1944-09-14 Rendering aluminum and aluminum alloy surfaces corrosion resistant

Publications (1)

Publication Number Publication Date
GB601736A true GB601736A (en) 1948-05-12

Family

ID=24212221

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23435/45A Expired GB601736A (en) 1944-09-14 1945-09-11 Improvements in and relating to the production of protective coatings on aluminium-alloy surfaces

Country Status (3)

Country Link
US (1) US2460897A (en)
FR (1) FR916540A (en)
GB (1) GB601736A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3077193B2 (en) * 1990-11-23 2000-08-14 株式会社デンソー Method of forming corrosion resistant chemical conversion coating on aluminum surface
CN114808077B (en) * 2022-05-22 2023-09-01 广东兴发铝业有限公司 Surface treatment process of aluminum material

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL29133C (en) * 1928-08-31
US1838633A (en) * 1929-08-10 1931-12-29 Pacz Aladar Coloring aluminum alloys
US2364993A (en) * 1942-12-29 1944-12-12 Walter R Meyer Process for blackening copper or copper alloy surfaces

Also Published As

Publication number Publication date
US2460897A (en) 1949-02-08
FR916540A (en) 1946-12-09

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