Classifications

• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
  • C25D17/02—Tanks; Installations therefor
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
  • C25D17/10—Electrodes, e.g. composition, counter electrode
  • C25D17/12—Shape or form
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
  • C25D17/16—Apparatus for electrolytic coating of small objects in bulk
  • C25D17/18—Apparatus for electrolytic coating of small objects in bulk having closed containers
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D7/00—Electroplating characterised by the article coated
  • C25D7/04—Tubes; Rings; Hollow bodies

Definitions

• the present invention relates to an improvement in the method of surface treatment of metal parts, by electrolysis and relates more particularly to a continuous electrolysis cell using the principle of immersion and transfer of parts.
• the surface treatment of parts by electrolysis is a well-known method, which requires the implementation of an electric current for carrying out the treatment.
• Electrolysis can be applied to metals, such as anodizing aluminum, anaphoresis which allows the electrolytic deposition of aluminum paint, steel treatments such as zinc plating, chromium plating, copper plating, nickel plating, cataphoresis, phosphating, copper treatments such as tin plating, but also electroplating treatments on non-metallic parts such as electroplating of plastic parts.
• metals such as anodizing aluminum, anaphoresis which allows the electrolytic deposition of aluminum paint, steel treatments such as zinc plating, chromium plating, copper plating, nickel plating, cataphoresis, phosphating, copper treatments such as tin plating, but also electroplating treatments on non-metallic parts such as electroplating of plastic parts.
• the parts to be treated are: either attached to supports placed so as to remain immobile in the electrolytic cell.
• an electrical contact such as for example a copper V, placed on the edge of the tank allows to bring the current to the supports placed on the V and thus parts.
• This method therefore does not prevent the formation of air bubbles and therefore a lack of treatment in the hollow parts of some parts, and results in a lack of homogeneity in the treatment.
• - either placed in bulk in electrolysis barrels.
• the mass-treated parts are brought into contact with a moving electrode placed in the barrel.
• the disadvantage of this method is that the parts put in mass and in rotation are damaged by friction against each other.
• the object of the invention is then to overcome all or part of the disadvantages of existing methods and implementation facilities, as mentioned above.
• the present invention relates to an installation implementing a surface treatment method for parts such as hollow parts or the like, in which the parts are immersed completely inside at least one treatment tank. containing a liquid characterized in that each hollow part is immersed by making it rotate so that the air bubbles that can be created inside the tank are driven from the inner wall of said part.
• the metal surface treatment plant comprises an electrolysis cell comprising a treatment liquid in which the treated parts are immersed, and is characterized in that the parts to be treated are fixed on a pivoting drum so that it is made for each piece in the tank, at least one rotational movement, and in that the tank comprises at least two electrodes, while the drum is fed with electric current of opposite polarity to that of the electrodes, by means of at least one contact pad which is brought into contact on the drive ring of the drum.
• the tank comprises a set of contact pads, for example two times fifteen pads sandwiching the drive ring of the drum
• the contact pads are movably mounted in translation towards the flanks of the ring, and are biased in abutment against the corresponding face of the corresponding flank by an elastic system such as a spring.
• the two lateral successions of pads are arranged in an arc having the center of the pivot center of the drum, while each of the contact pads is connected to a copper cable or braid connected to the power supply.
• the outer periphery of the drum comprises a succession of slides, intended to receive by sliding cassettes serving as a support for the parts to be treated, and that the slides are equipped with flexible contact blades, which are fixed to the slides, to transmit the electrical contact of the slide to the corresponding cassette and therefore to the parts attached thereto, thus allowing the electrolysis to be carried out.
• the tank comprises a motor designed to rotate the pivoting drum by the cooperation of a toothed wheel (6) with a succession of pegs mounted parallel to each other, and between the two flanges of one of the sidewalls of the drum. .
• the tank comprises two electrodes connected to a negative or positive polarity, while the drum is fed at the opposite polarity, and that said electrodes consist of aluminum plates.
• Figure 1 is an end view illustrating the vessel of the invention
• Figure 2 is a view from above
• Figure 3 is a side view
• Figure 4 is a view similar to Figure 1, but without the drum.
• each piece is immersed in a tank, making it do at least one rotational movement such that the air bubbles may be created inside. of the tank are driven from the inner walls of said room.
• a rotational movement of at least 90 ° is made to each piece, and preferably a rotation of 360 °.
• a predetermined number of said parts is placed beforehand on a support or cassette (4) comprising at least one holding member to retain each of them.
• the part treatment plant with the general reference (100) consists of a tank (1) comprising a drum (2), rotatably mounted inside the latter, along an axis horizontal (X, X '), on which the parts to be treated are fixed.
• the drum (2) comprises, at its outer periphery, a succession of slides (3) with an axis parallel to the axis of rotation of the drum, intended to receive for example by sliding the cassettes (4). serving as support for the parts to be treated.
• the cassettes are for example those described in the European patent application EP-A-I 433 537 and comprise a set of parts supports for fixing on a single cassette several parts.
• the tank (1) of the invention comprises a motor for rotating the pivoting drum (2) by the cooperation of a toothed wheel (6) with a succession of pegs (7) mounted parallel to each other, and between the two flanges (10a, 10b) of one of the flanks (10) of the drum, constituting the drive ring.
• the tank (1) comprises for example two electrodes (8a, 8b) connected to a negative polarity for electrolysis of aluminum parts. It will be noted that these electrodes (8a, 8b) would be connected to a positive polarity in the case of electrolysis of a steel or copper part.
• the drum (2) is advantageously titanium but it could be otherwise as for example plastic for treatments requiring a metal deposition such as zinc coating.
• Said drum (2) is fed at the opposite polarity, that is to say positive in the case of anodization.
• the tank comprises a set of contact pads, such as for example (9) two times fifteen pads (9a, 9b, 9c, 9o), as illustrated more particularly in FIG. 4.
• the electrical contact with the drum is by sandwiching the drive ring (10) between two sets of fifteen pads.
• Said contact pads (9) are for example graphite, but could be in another material for other treatments.
• each of the pads (9) is movably mounted in translation to the flanks (10a, 10b) of the ring, and is biased against the corresponding face of the corresponding flank by an elastic system such as a spring.
• Each of the contact pads (9) is connected to a copper cable or braid (12) connected to the power supply (13).
• the graphite contacts rub on the flanks (10a, 10b) of the drive ring of the drum, thereby transmitting the current to the entire structure of the wheel, the slides (3) serving as support for the cassettes.
• the slides (3) are advantageously equipped with flexible contact blades, which are fixed to the slideways, to transmit the electrical contact of the slideway to the corresponding cassette (4) and thus to the parts which are fixed thereto, thus making it possible to realize the electrolysis between the connected parts, polarized in this application example to the positive pole and the electrodes (8a, 8b).
• the electrodes (8a, 8b) advantageously consist of aluminum plates polarized at the negative pole.
• the aluminum plates constituting the electrodes are arranged for example on either side of the drum near the walls of the tank, and extend parallel to the axis of rotation of the drum.
• the tank (1) thus equipped and filled with an electrolytic solution such as sulfuric acid for anodizing the aluminum, makes it possible to anodize aluminum parts attached to the cassettes.
• an electrolytic solution such as sulfuric acid for anodizing the aluminum

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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)
• Electroplating Methods And Accessories (AREA)

Priority Applications (9)

Applications Claiming Priority (4)

Publications (1)

Family

ID=38234485

Family Applications (1)

Country Status (13)

Cited By (1)

Families Citing this family (2)

Citations (4)

Family Cites Families (3)

• 2006
  • 2006-09-22 FR FR0608406A patent/FR2900162B1/fr not_active Expired - Fee Related
• 2007
  • 2007-04-19 JP JP2009505984A patent/JP4413993B2/ja not_active Expired - Fee Related
  • 2007-04-19 MX MX2008013525A patent/MX2008013525A/es active IP Right Grant
  • 2007-04-19 PL PL07734332T patent/PL2013383T3/pl unknown
  • 2007-04-19 KR KR1020087025642A patent/KR101121634B1/ko not_active IP Right Cessation
  • 2007-04-19 WO PCT/IB2007/001013 patent/WO2007122471A1/fr active Application Filing
  • 2007-04-19 BR BRPI0710160-0A patent/BRPI0710160A2/pt not_active IP Right Cessation
  • 2007-04-19 RU RU2008145889/02A patent/RU2398918C2/ru not_active IP Right Cessation
  • 2007-04-19 EP EP07734332A patent/EP2013383B1/fr not_active Not-in-force
  • 2007-04-19 CA CA2647400A patent/CA2647400C/fr not_active Expired - Fee Related
  • 2007-04-19 PT PT07734332T patent/PT2013383E/pt unknown
  • 2007-04-19 ES ES07734332T patent/ES2390684T3/es active Active
  • 2007-04-19 US US12/296,609 patent/US20090057138A1/en not_active Abandoned

Patent Citations (4)

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