EP0143051A2 - Process for removing gangue from metallic parts - Google Patents
Process for removing gangue from metallic parts Download PDFInfo
- Publication number
- EP0143051A2 EP0143051A2 EP84402330A EP84402330A EP0143051A2 EP 0143051 A2 EP0143051 A2 EP 0143051A2 EP 84402330 A EP84402330 A EP 84402330A EP 84402330 A EP84402330 A EP 84402330A EP 0143051 A2 EP0143051 A2 EP 0143051A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- piece
- gangue
- bath
- archeology
- metallic parts
- 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.)
- Granted
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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 piece, in particular from a piece of marine archeology.
- 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 / 1 ions under a 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 CO 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.
- Electric current can be brought by any medium to the workpiece, for example using a rod screwed into the workpiece, pliers or more simply a simple 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 - II ions.
- a metallic piece of marine archeology 3 is immersed in this bath to which a gangue 4 adheres.
- the part 3 was previously 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.
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- 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)
Abstract
Description
La présente invention concerne un procédé pour enlever la gangue d'une pièce métallique, notamment d'une pièce d'archéologie marine.The present invention relates to a method for removing the gangue from a metallic piece, in particular from a piece of marine archeology.
A l'heure actuelle, la gangue des pièces métalliques d'archéologie marine est enlevée par des procédés mécaniques tels que sablage, grattage, etc.At present, the gangue of metallic pieces of marine archeology is removed by mechanical processes such as sanding, scraping, etc.
Ces procédés présentent l'inconvénient de nécessiter des installations importantes (installation de sablage), ou un travail important (grattage), ainsi que de présenter des risques de détérioration de la pièce.These methods have the drawback of requiring significant installations (sanding installation), or significant work (scraping), as well as presenting risks of deterioration of the part.
La présente invention a pour but de fournir un procédé simple à mettre en oeuvre.The object of the present invention is to provide a method which is simple to implement.
La présente invention a ainsi pour objet un procédé pour enlever la gangue d'une pièce métallique, notamment d'une pièce d'archéologie marine, caractérisé en ce que l'on effectue un traitement de la pièce dans un bain aqueux contenant de 8 à 40 grammes d'ions OH /1 sous une polarisation cathodique, en maintenant cette pièce pendant un temps suffisant pour obtenir un détachement au moins partiel de la gangue par rapport à la pièce, puis on retire la pièce du bain et on sépare la gangue de la pièce.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 / 1 ions under a 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.
Pour constituer le bain aqueux, on peut utiliser toute solution aqueuse permettant d'avoir la teneur indiquée en ions OH . Le cation est indifférent. On peut ainsi utiliser des solutions d'hydroxydes ou de carbonates hydrosolubles, par exemple KOH, NaOH, Na2CO3, LiOH.To constitute the aqueous bath, 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 CO 3 , LiOH.
La pièce est soumise à une polarisation cathodique qui assure une protection de la pièce. Cette polarisation est de préférence inférieure à 2 volts de façon à éviter tout dégagement important d'hydrogène. Cette polarisation est avantageusement de 1,3 à 2 volts.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.
Le courant électrique peut être amené par tout moyen à la pièce par exemple à l'aide d'une tige vissée dans la pièce, d'une pince ou plus simplement d'une simple mise en contact avec le conducteur d'amenée du courant.Electric current can be brought by any medium to the workpiece, for example using a rod screwed into the workpiece, pliers or more simply a simple contact with the current supply conductor.
L'anode qui est utilisée pour établir cette polarisation peut être constituée de n'importe quel matériau peu destructible ayant une conductivité suffisante. On peut utiliser par exemple de l'acier inoxydable.The anode which is used to establish this polarization can be made of any low-destructible material having sufficient conductivity. For example, stainless steel can be used.
Généralement on opère en courant imposé (par exemple 0,1 à 1 mA/cml) et en potentiel libre.Generally one operates with an imposed current (for example 0.1 to 1 mA / cm l ) and with free potential.
Le traitement peut généralement être effectué à une température voisine de la température ambiante (de 15 à 50°C).The treatment can generally be carried out at a temperature close to room temperature (from 15 to 50 ° C).
Le temps de traitement dépend de la nature de la gangue et de l'importance en surface et en volume de l'incrustation. Généralement, le temps de traitement peut varier de quelques heures à quelques semaineset est typiquement de 100 à 600 heures.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.
Après ce traitement, la pièce est retirée du bain. La gangue peut alors tomber d'elle-même dans certains cas. Plus généralement elle est éliminée par une simple action mécanique de brossage et de cassure. Ainsi, le traitement facilite grandement le détachement de la gangue par rapport à la pièce métallique.After this treatment, 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. Thus, the treatment greatly facilitates the detachment of the gangue from the metal part.
Ce procédé est avantageusement utilisé pour la préparation de restauration de pièce d'archéologie marine, par exemple de ferrures de fonte, canons, boulets, de fer et de plomb.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.
On donnera ci-après un exemple de mise en oeuvre de l'invention.An example of implementation of the invention will be given below.
On utilise une installation telle que représentée schématiquement sur la figure unique.An installation is used as shown schematically in the single figure.
Une cuve 1 contient un bain aqueux 2. Ce bain contient une solution aqueuse d'hydroxyde de potassium contenant 20 grammes d'ions OH-Il.A
On plonge dans ce bain une pièce métallique d'archéologie marine 3 à laquelle adhère une gangue 4.A metallic piece of
La pièce 3 a été préalablement munie d'un trou taraudé et reliée à un conducteur 5 maintenu par une vis 6 fixée dans le trou taraudé.The
Dans le bain plonge également une anode 7 en acier inoxydable.Also in the bath is an
On impose une polarisation cathodique à la pièce 3 avec un courant imposé de 0,5 mA/cm2. La polarisation s'établit à 1,3 à 2 volts.Cathode polarization is imposed on
On maintient le traitement pendant 200 heures.The treatment is maintained for 200 hours.
On retire ensuite la pièce du bain. On constate que la gangue se détache alors très facilement.The piece is then removed from the bath. We see that the gangue then comes off very easily.
Claims (2)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8318747 | 1983-11-24 | ||
| FR8318747A FR2555616B1 (en) | 1983-11-24 | 1983-11-24 | PROCESS FOR REMOVING BAND OF METAL PARTS |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0143051A2 true EP0143051A2 (en) | 1985-05-29 |
| EP0143051A3 EP0143051A3 (en) | 1985-07-31 |
| EP0143051B1 EP0143051B1 (en) | 1987-06-03 |
Family
ID=9294478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19840402330 Expired EP0143051B1 (en) | 1983-11-24 | 1984-11-15 | Process for removing gangue from metallic parts |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0143051B1 (en) |
| EG (1) | EG16691A (en) |
| ES (1) | ES8507189A1 (en) |
| FR (1) | FR2555616B1 (en) |
| GR (1) | GR81024B (en) |
| TR (1) | TR21915A (en) |
| YU (1) | YU45679B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU580479B1 (en) * | 1986-11-07 | 1989-01-12 | China Steel Corporation | A cleaning composition for electrocleaning cold-rolled steel |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2221525B1 (en) * | 2002-05-24 | 2005-10-01 | Universidad De Cadiz | COMBINED SYSTEM FOR REGISTRATION AND UNDERWATER ARCHAEOLOGICAL CONSERVATION IN SITU. |
Citations (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/en not_active Expired
-
1984
- 1984-11-15 EP EP19840402330 patent/EP0143051B1/en not_active Expired
- 1984-11-22 ES ES537851A patent/ES8507189A1/en not_active Expired
- 1984-11-22 GR GR81024A patent/GR81024B/en unknown
- 1984-11-23 TR TR2191584A patent/TR21915A/en unknown
- 1984-11-23 YU YU198884A patent/YU45679B/en unknown
- 1984-11-24 EG EG71884A patent/EG16691A/en active
Patent Citations (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 |
Non-Patent Citations (1)
| Title |
|---|
| CHEMICAL ABSTRACTS, vol. 87, no. 19, 7 novembre 1977, page 498, no. 151016g, Columbus, Ohio, US; G. GENIN: "Corrosion, cleaning, and protection of artistic structures. Ancient bronzes: analysis, treatment, preservation" & REV. SOC. R. BELGE ING. IND. 1977, (2), 72-7 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU580479B1 (en) * | 1986-11-07 | 1989-01-12 | China Steel Corporation | A cleaning composition for electrocleaning cold-rolled steel |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2555616B1 (en) | 1986-05-16 |
| EP0143051A3 (en) | 1985-07-31 |
| GR81024B (en) | 1985-03-21 |
| YU45679B (en) | 1992-07-20 |
| FR2555616A1 (en) | 1985-05-31 |
| TR21915A (en) | 1985-11-01 |
| ES537851A0 (en) | 1985-09-16 |
| EG16691A (en) | 1989-03-30 |
| YU198884A (en) | 1987-06-30 |
| ES8507189A1 (en) | 1985-09-16 |
| EP0143051B1 (en) | 1987-06-03 |
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