EP0143051B1 - Procédé pour enlever la gangue de pièces métalliques - Google Patents
Procédé pour enlever la gangue de pièces métalliques Download PDFInfo
- Publication number
- EP0143051B1 EP0143051B1 EP19840402330 EP84402330A EP0143051B1 EP 0143051 B1 EP0143051 B1 EP 0143051B1 EP 19840402330 EP19840402330 EP 19840402330 EP 84402330 A EP84402330 A EP 84402330A EP 0143051 B1 EP0143051 B1 EP 0143051B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piece
- gangue
- bath
- metallic parts
- polarization
- 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
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
Definitions
- the present invention relates to a method for removing the gangue from a metallic archaeological piece, in particular from a marine archaeological piece.
- the gangue of metallic pieces of marine archeology is removed by mechanical processes such as sanding, scraping, etc.
- the object of the present invention is to provide a method which is simple to implement.
- the present invention thus relates to a method for removing the gangue from a metal piece, in particular from a piece of marine archeology, characterized in that a treatment of the piece is carried out in an aqueous bath containing from 8 to 40 grams of OH- / I ions under cathodic polarization, maintaining this part for a sufficient time to obtain an at least partial detachment of the gangue with respect to the part, then the part is removed from the bath and the gangue is separated from the room.
- any aqueous solution can be used which makes it possible to have the indicated content of OH- ions.
- the cation is indifferent. It is thus possible to use solutions of hydroxides or water-soluble carbonates, for example KOH, NaOH, Na 2 C0 3 , LiOH.
- the part is subjected to a cathodic polarization which ensures a protection of the part.
- This polarization is preferably less than 2 volts so as to avoid any significant release of hydrogen.
- This polarization is advantageously from 1.3 to 2 volts.
- the electric current can be brought by any means to the room, for example using a rod screwed into the room, pliers or more simply by simply bringing it into contact with the current supply conductor.
- the anode which is used to establish this polarization can be made of any low-destructible material having sufficient conductivity.
- stainless steel can be used.
- the treatment can generally be carried out at a temperature close to room temperature (from 15 to 50 ° C).
- the treatment time depends on the nature of the gangue and the size of the surface and volume of the encrustation. Generally, the processing time can vary from a few hours to a few weeks and is typically 100 to 600 hours.
- the part is removed from the bath. Gangue can then fall off on its own in some cases. More generally, it is eliminated by a simple mechanical action of brushing and breaking.
- the treatment greatly facilitates the detachment of the gangue from the metal part.
- This process is advantageously used for the preparation of restoration of a piece of marine archeology, for example of iron fittings, cannons, balls, iron and lead.
- a tank 1 contains an aqueous bath 2. This bath contains an aqueous solution of potassium hydroxide containing 20 grams of OH- / I ions.
- a metallic piece of marine archeology 3 is immersed in this bath to which a gangue 4 adheres.
- the part 3 has previously been provided with a tapped hole and connected to a conductor 5 held by a screw 6 fixed in the tapped hole.
- anode 7 made of stainless steel.
- Cathode polarization is imposed on part 3 with an imposed current of 0.5 mA / cm 2 .
- the polarization is 1.3 to 2 volts.
- the treatment is maintained for 200 hours.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrolytic Production Of Metals (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8318747 | 1983-11-24 | ||
FR8318747A FR2555616B1 (fr) | 1983-11-24 | 1983-11-24 | Procede pour enlever la gangue de pieces metalliques |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0143051A2 EP0143051A2 (fr) | 1985-05-29 |
EP0143051A3 EP0143051A3 (en) | 1985-07-31 |
EP0143051B1 true EP0143051B1 (fr) | 1987-06-03 |
Family
ID=9294478
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19840402330 Expired EP0143051B1 (fr) | 1983-11-24 | 1984-11-15 | Procédé pour enlever la gangue de pièces métalliques |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0143051B1 (es) |
EG (1) | EG16691A (es) |
ES (1) | ES8507189A1 (es) |
FR (1) | FR2555616B1 (es) |
GR (1) | GR81024B (es) |
TR (1) | TR21915A (es) |
YU (1) | YU45679B (es) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4746453A (en) * | 1986-11-07 | 1988-05-24 | China Steel Corporation | Cleaning composition for electrocleaning cold-rolled steel |
ES2221525B1 (es) * | 2002-05-24 | 2005-10-01 | Universidad De Cadiz | Sistema combinado para el registro y la conservacion arqueologica subacuatica in situ. |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB505273A (en) * | 1936-08-01 | 1939-05-01 | John Galbraith Quiros Worledge | Electro-chemical process for renovating table plate and other metal surfaces |
-
1983
- 1983-11-24 FR FR8318747A patent/FR2555616B1/fr not_active Expired
-
1984
- 1984-11-15 EP EP19840402330 patent/EP0143051B1/fr not_active Expired
- 1984-11-22 GR GR81024A patent/GR81024B/el unknown
- 1984-11-22 ES ES537851A patent/ES8507189A1/es not_active Expired
- 1984-11-23 TR TR2191584A patent/TR21915A/xx unknown
- 1984-11-23 YU YU198884A patent/YU45679B/sh unknown
- 1984-11-24 EG EG71884A patent/EG16691A/xx active
Also Published As
Publication number | Publication date |
---|---|
GR81024B (en) | 1985-03-21 |
ES537851A0 (es) | 1985-09-16 |
YU45679B (sh) | 1992-07-20 |
EP0143051A3 (en) | 1985-07-31 |
FR2555616B1 (fr) | 1986-05-16 |
EP0143051A2 (fr) | 1985-05-29 |
TR21915A (tr) | 1985-11-01 |
EG16691A (en) | 1989-03-30 |
FR2555616A1 (fr) | 1985-05-31 |
ES8507189A1 (es) | 1985-09-16 |
YU198884A (en) | 1987-06-30 |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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AK | Designated contracting states |
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RTI1 | Title (correction) | ||
AK | Designated contracting states |
Designated state(s): BE GB IT NL |
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17P | Request for examination filed |
Effective date: 19851207 |
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17Q | First examination report despatched |
Effective date: 19860813 |
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ITF | It: translation for a ep patent filed |
Owner name: JACOBACCI & PERANI S.P.A. |
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BERE | Be: lapsed |
Owner name: ELECTRICITE DE FRANCE SERVICE NATIONAL Effective date: 19941130 |
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Effective date: 19941115 |