| (19) |
 |
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(11) |
EP 1 199 385 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
04.02.2004 Bulletin 2004/06 |
| (43) |
Date of publication A2: |
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24.04.2002 Bulletin 2002/17 |
| (22) |
Date of filing: 16.10.2001 |
|
| (51) |
International Patent Classification (IPC)7: C25D 11/26 |
|
| (84) |
Designated Contracting States: |
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AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
Designated Extension States: |
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AL LT LV MK RO SI |
| (30) |
Priority: |
19.10.2000 IT MI002263
|
| (71) |
Applicant: CESCOR S.r.l. |
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20134 Milano (IT) |
|
| (72) |
Inventor: |
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- Pedeferri, Pietro
20131 Milano (IT)
|
| (74) |
Representative: Bianchetti, Giuseppe, Prof. |
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Bianchetti Bracco Minoja S.r.l. Via Rossini, 8
20122 Milano
20122 Milano (IT) |
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| |
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| (54) |
Method of coloring titanium and its alloys through anodic oxidation |
(57) The following is a method of coloring titanium and titanium alloys through anodic
oxidation in an electrolytic bath. This method is characterized by the fact that titanium
and its alloys undergo a preliminary anodic treatment at a constant potential in an
electrolytic bath consisting of hydrohalogen acids or salts, fluoboric, fluosilic,
acetic, oxalic, tartaric, nitric, phosphoric acids and their mixtures, possibly in
the presence of oxidizing agents.