EP0143051B1 - Verfahren zur Entfernung von Gangstein von Metallstücken - Google Patents

Verfahren zur Entfernung von Gangstein von Metallstücken Download PDF

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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
Application number
EP19840402330
Other languages
English (en)
French (fr)
Other versions
EP0143051A3 (en
EP0143051A2 (de
Inventor
Noel Lacoudre
Claude Volfovski
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.)
Electricite de France SA
Original Assignee
Electricite de France SA
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 Electricite de France SA filed Critical Electricite de France SA
Publication of EP0143051A2 publication Critical patent/EP0143051A2/de
Publication of EP0143051A3 publication Critical patent/EP0143051A3/fr
Application granted granted Critical
Publication of EP0143051B1 publication Critical patent/EP0143051B1/de
Expired legal-status Critical Current

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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 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)

Claims (2)

1. Verfahren zur Entfernung von Gangstein von archäologischen Metallstücken, insbesondere von archäologischen Meeresfundstücken, dadurch gekennzeichnet, dass man eine Behandlung des Stückes in einem wässrigen Bad durchführt, das 8 bis 40 g OH-/I Ionen enthält, unter kathodischer Polarisation, indem man dieses Stück während einer Zeit, die ausreicht um wenigstens eine teilweise Ablösung des Gangsteins im Verhältnis zu dem Stück zu erreichen, darin hält und dann das Stück aus dem Bad entfernt und das Gangstein vom Stück abtrennt.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass man mit einem angelegten Strom von 0,1 bis 1 mA/cm2 arbeitet.
EP19840402330 1983-11-24 1984-11-15 Verfahren zur Entfernung von Gangstein von Metallstücken Expired EP0143051B1 (de)

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 (de) 1985-05-29
EP0143051A3 EP0143051A3 (en) 1985-07-31
EP0143051B1 true EP0143051B1 (de) 1987-06-03

Family

ID=9294478

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840402330 Expired EP0143051B1 (de) 1983-11-24 1984-11-15 Verfahren zur Entfernung von Gangstein von Metallstücken

Country Status (7)

Country Link
EP (1) EP0143051B1 (de)
EG (1) EG16691A (de)
ES (1) ES8507189A1 (de)
FR (1) FR2555616B1 (de)
GR (1) GR81024B (de)
TR (1) TR21915A (de)
YU (1) YU45679B (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

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 (de) 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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