GB1067373A – Improvements in the anodic oxidation of aluminium and of its alloys
– Google Patents
GB1067373A – Improvements in the anodic oxidation of aluminium and of its alloys
– Google Patents
Improvements in the anodic oxidation of aluminium and of its alloys
Info
Publication number
GB1067373A
GB1067373A
GB18173/64A
GB1817364A
GB1067373A
GB 1067373 A
GB1067373 A
GB 1067373A
GB 18173/64 A
GB18173/64 A
GB 18173/64A
GB 1817364 A
GB1817364 A
GB 1817364A
GB 1067373 A
GB1067373 A
GB 1067373A
Authority
GB
United Kingdom
Prior art keywords
bath
aluminium
area
alloys
volts
Prior art date
1963-05-04
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
GB18173/64A
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.)
ALUMINIUM FRANCAIS
Original Assignee
ALUMINIUM FRANCAIS
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.)
1963-05-04
Filing date
1964-05-01
Publication date
1967-05-03
1964-05-01
Application filed by ALUMINIUM FRANCAIS
filed
Critical
ALUMINIUM FRANCAIS
1967-05-03
Publication of GB1067373A
publication
Critical
patent/GB1067373A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
C—CHEMISTRY; METALLURGY
C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
C25D11/02—Anodisation
C25D11/04—Anodisation of aluminium or alloys based thereon
C—CHEMISTRY; METALLURGY
C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
C25D11/02—Anodisation
C25D11/04—Anodisation of aluminium or alloys based thereon
C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
C25D11/08—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing inorganic acids
Abstract
In a process for the surface protection of aluminium and its alloys by anodic oxidation in a bath of chromic acid under a constant voltage with a direct current, the chromic acid concentration is between 15 and 19% by weight, the bath temperature is below 30 DEG C., the electrolysis voltage is below 25 volts, the area of the anodic surface is between 1.7 X B and 2.3 X B dm2, where B is the volume of the bath expressed in litres, and the area of the cathodic surface is below 0.06 X B dm2, the ratio of the number of gram atoms of chromium dissolved in the bath in the hexavalent state to the number of gram atoms in the trivalent state thus remaining constant with a value of above 70. The process is preferably carried out without agitation; using an electrolytic voltage of 21 to 23 volts and with a cathodic surface area of 0.03 B to 0.05 B dm2, and the bath may be subjected to purging over cation exchange material to fix the aluminium salts. The bath may also have added thereto in a proportion of 0.01 – 0.2% by weight of the bath, 9% hydrogen peroxide.
GB18173/64A
1963-05-04
1964-05-01
Improvements in the anodic oxidation of aluminium and of its alloys
Expired
GB1067373A
(en)
Applications Claiming Priority (2)
Application Number
Priority Date
Filing Date
Title
ES28769363
1963-05-04
ES29598464
1964-02-01
Publications (1)
Publication Number
Publication Date
GB1067373A
true
GB1067373A
(en)
1967-05-03
Family
ID=26155603
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB18173/64A
Expired
GB1067373A
(en)
1963-05-04
1964-05-01
Improvements in the anodic oxidation of aluminium and of its alloys
Country Status (9)
Country
Link
US
(1)
US3341435A
(en)
BE
(1)
BE647452A
(en)
CH
(1)
CH428371A
(en)
DE
(1)
DE1496709B2
(en)
DK
(1)
DK128823B
(en)
FR
(1)
FR1399797A
(en)
GB
(1)
GB1067373A
(en)
LU
(1)
LU46011A1
(en)
NL
(1)
NL142457B
(en)
Families Citing this family (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US4256547A
(en)
1979-07-12
1981-03-17
General Dynamics Corporation
Universal chromic acid anodizing method
Family Cites Families (4)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB223994A
(en)
*
1923-08-02
1924-11-03
Guy Dunstan Bengough
Improved process of protecting surfaces of aluminium of aluminium alloys
US2085002A
(en)
*
1934-05-22
1937-06-29
Robert W Buzzard
Anodic treatment of aluminum
US2066327A
(en)
*
1934-05-28
1937-01-05
Robert W Buzzard
Bath for anodic treatment of aluminum
US2788317A
(en)
*
1954-02-25
1957-04-09
Koenig And Pope
Aluminum and process applicable thereto
1964
1964-04-29
FR
FR972806A
patent/FR1399797A/en
not_active
Expired
1964-04-30
US
US363782A
patent/US3341435A/en
not_active
Expired – Lifetime
1964-05-01
NL
NL646404879A
patent/NL142457B/en
unknown
1964-05-01
CH
CH571264A
patent/CH428371A/en
unknown
1964-05-01
GB
GB18173/64A
patent/GB1067373A/en
not_active
Expired
1964-05-02
DK
DK222164AA
patent/DK128823B/en
unknown
1964-05-02
LU
LU46011D
patent/LU46011A1/xx
unknown
1964-05-04
BE
BE647452D
patent/BE647452A/xx
unknown
1964-05-04
DE
DE19641496709
patent/DE1496709B2/en
active
Pending
Also Published As
Publication number
Publication date
DE1496709A1
(en)
1969-06-04
BE647452A
(en)
1964-11-04
DE1496709B2
(en)
1971-04-15
NL142457B
(en)
1974-06-17
US3341435A
(en)
1967-09-12
NL6404879A
(en)
1964-11-05
CH428371A
(en)
1967-01-15
DK128823B
(en)
1974-07-08
FR1399797A
(en)
1965-05-21
LU46011A1
(en)
1964-11-03
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