EP3093376B1 - Verfahren zur kontinuirlichen elektrochemischen verzinnung von aluminiumdrähten - Google Patents

Verfahren zur kontinuirlichen elektrochemischen verzinnung von aluminiumdrähten Download PDF

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Publication number
EP3093376B1
EP3093376B1 EP16162541.3A EP16162541A EP3093376B1 EP 3093376 B1 EP3093376 B1 EP 3093376B1 EP 16162541 A EP16162541 A EP 16162541A EP 3093376 B1 EP3093376 B1 EP 3093376B1
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Prior art keywords
aluminum wire
comprised
solution
tank
copper
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English (en)
French (fr)
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EP3093376A1 (de
Inventor
Caterina Mazzocchi
Gianluigi Lauro
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BTicino SpA
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BTicino SpA
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/10—Electroplating with more than one layer of the same or of different metals
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/30—Electroplating: Baths therefor from solutions of tin
    • C25D3/32—Electroplating: Baths therefor from solutions of tin characterised by the organic bath constituents used
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/38—Electroplating: Baths therefor from solutions of copper
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/34—Pretreatment of metallic surfaces to be electroplated
    • C25D5/42—Pretreatment of metallic surfaces to be electroplated of light metals
    • C25D5/44—Aluminium
    • 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
    • C25D7/06—Wires; Strips; Foils
    • C25D7/0607—Wires

Definitions

  • the object of the present invention is a process for continuous electrochemical tinning of an aluminum wire.
  • ETP copper used in the electrical field has the following electrical characteristics: IACS conductivity >99%, specific weight of 8.93 Kg/dm 3 . Considering the continuous increase in the cost of copper, there is a need to seek alternative materials capable of offering a good compromise between cost and conductive properties.
  • aluminum is the material considered most suitable due to its electrical characteristics (IACS 50-63.8% depending on the alloy), its mechanical characteristics, its workability, its low specific weight (2.7 Kg/dm 3 ), its low cost, its abundance and wide availability in nature. Therefore, currently aluminum is the only commercial alternative to copper in the electrical field.
  • Aluminum is used as conductor in high and medium power busbars, where the conductors consist of bars. In low power busbars, where wires are generally used as conductors, the material used is copper.
  • the resistance of aluminum to corrosion is linked to the formation of a very compact layer of aluminum oxide Al 2 O 3 , known as alumina, which protects the material from further corrosion attacks.
  • alumina aluminum oxide
  • Such an oxide constitutes a very stable layer that coats the aluminum providing a passivating effect that impedes the attack of the oxide with regard to the underlying metal.
  • the aim of the subject invention is to make an aluminum wire for applications in the electrical field that has suitable electrical and mechanical characteristics and that allows a copper wire to be replaced.
  • an embodiment it is possible to make an aluminum wire that has a tinning over its entire surface, protects the material from oxidation and makes it possible to have a better interface in the electrical contact area.
  • the process of the present invention makes it possible to make an aluminum wire that can also be used in low power ducts.
  • an embodiment it is possible to make an aluminum wire that is sized and treated suitably to ensure electrical performance comparable to that of a copper wire. Thanks to an embodiment, it is possible to make an aluminum wire whose performance has been verified through overheating tests pursuant to product standard EN61439-6. Thanks to an embodiment, it is possible to make an aluminum wire that offers comparable performance to that of a copper wire, and that allows the production costs to be reduced.
  • the object of the present invention is a process for continuous electrochemical tinning of an aluminum wire 1.
  • the process comprises a step of providing an aluminum wire 1, and in particular a first coil 2 of aluminum wire 1 and a second coil 3 configured to rotate and to be operatively coupled with the aluminum wire of the first coil 2.
  • the second coil 3 or winder
  • the first coil 2 or unwinder
  • the aluminum wire is in traction between the first coil 2 and the second coil 3.
  • the second coil 3 winds the wire that is thus unwound from the first coil 2.
  • both the first coil 2 and the second coil 3 can be set in rotation simultaneously to make the aluminum wire 1 run.
  • the process comprises the step of performing a pickling of the aluminum wire 1.
  • the aluminum wire is made to pass through a pickling tank 4 containing a solution comprising caustic soda and gluconate, and having a temperature comprised between 40°C and 80°C.
  • the pickling tank 4 is configured to allow the aluminum wire 1 to run through it, keeping the aluminum wire 1 immersed in the solution of caustic soda and gluconate.
  • the solution of caustic soda and gluconate has a concentration comprised between 25g/l and 35g/l and a temperature comprised between 50°C and 70°C.
  • the aluminum wire 1 is completely immersed in the solution of caustic soda and gluconate when it runs through the pickling tank 4. It should be specified that the aluminum wire 1 runs through the pickling tank 4 thanks to the synergic movement of the first coil 2 and of the second coil 3. This step allows both the cleaning and the activation of the material of which the aluminum wire 1 consists.
  • the pickling tank 4 comprises means configured for measuring and regulating the temperature of the pickling solution contained in it.
  • the means comprise pulleys and guides adapted for keeping the aluminum wire 1 immersed in the solutions contained in each treatment tank, and for allowing the aluminum wire 1 to run through the plurality of tanks.
  • the pickling step of the aluminum wire 1 is followed by a washing step, this washing step in turn preferably preceded by a pre-washing step of the aluminum wire 1.
  • the pickling step of the aluminum wire 1 makes it possible to remove the oxide layers present on the surface of the wire, so as to make the surface suitable for coating with successive metallic layers (e.g. copper, tin) by electrolytic galvanization.
  • metallic layers e.g. copper, tin
  • the process also comprises a step of carburizing the aluminum wire 1 obtained from the pickling step, carried out by passing the aluminum wire 1 through a carburization tank 5 containing a solution comprising zinc, caustic soda, and preferably additives, and having a temperature comprised between 15°C and 50°C.
  • the carburization tank 5 is configured to allow the aluminum wire 1 to run through it, keeping the aluminum wire 1 immersed in the solution of zinc, caustic soda and additives.
  • the solution of zinc, caustic soda and additives has a concentration comprised between 18% and 22% in volume and a temperature comprised between 20°C and 45°C.
  • the aluminum wire 1 is completely immersed in the solution of zinc, caustic soda and additives when it runs inside the carburization tank 5.
  • the step of carburizing the aluminum wire is followed by a washing step, this washing step in turn preferably preceded by a pre-washing step of the aluminum wire 1.
  • the carburization tank 5 comprises means configured for measuring and regulating the temperature of the carburization solution contained in it.
  • the step of carburizing the aluminum wire 1 allows the surface of the wire itself to be prepared for the application of successive galvanic coating layers.
  • the process comprises a step of performing alkaline copper plating (i.e. by electrolytic galvanization) of the aluminum wire 1 obtained from the carburizing step, by making the aluminum wire 1 pass through an alkaline copper plating tank 6 containing a solution comprising copper and conducting salts, and having a temperature comprised between 50°C and 70°C and an applied voltage value comprised between 2V and 4V.
  • the alkaline copper plating tank 6 is configured to allow the aluminum wire 1 to run through it, always keeping the aluminum wire 1 immersed in the solution of copper and conducting salts.
  • the solution of copper and conducting salts has a temperature comprised between 60°C and 65°C and an applied voltage value comprised between 2.7V and 3.2V, and has a concentration comprised between 14g/l and 17g/l and a pH comprised between 8 and 9.5.
  • the aluminum wire 1 is completely immersed in said solution of copper and conducting salts when it runs inside the alkaline copper plating tank 6.
  • the step of performing alkaline copper plating is followed by a washing step, this washing step in turn preferably preceded by a pre-washing step of the aluminum wire 1.
  • the alkaline copper plating tank 6 comprises means configured for measuring and regulating the temperature of the alkaline copper plating solution contained in it.
  • the process also comprises the step of performing acid copper plating (i.e. by electrolytic galvanization) of the aluminum wire (1) obtained from the alkaline copper plating step, by moving the aluminum wire 1 through an acid copper plating tank 7 containing a solution comprising copper sulfate, sulfuric acid and preferably additives, and having a temperature comprised between 20°C and 40°C and an applied voltage value comprised between 0.8V and 2V.
  • the acid copper plating tank 7 is configured to allow the aluminum wire 1 to run through it, always keeping the aluminum wire 1 immersed in the solution of copper sulfate, sulfuric acid and additives.
  • the solution of copper sulfate, sulfuric acid and additives has a temperature comprised between 25°C and 35°C and an applied voltage value comprised between IV and 1,5V, and has a concentration of copper sulfate comprised between 180g/l and 220g/l, a concentration of sulfuric acid comprised between 60g/l and 70g/l and a concentration of additives comprised between 2cm 3 /l and 3cm 3 /l.
  • the aluminum wire 1 is completely immersed in the solution of copper sulfate, sulfuric acid and additives when it runs inside the acid copper plating tank 7.
  • the step of performing acid copper plating of the aluminum wire 1 is followed by a washing step, this washing step in turn preferably preceded by a pre-washing step of the aluminum wire 1.
  • the acid copper plating tank 7 comprises means configured for measuring and regulating the temperature of the acid copper plating solution contained in it.
  • the method also comprises the step of performing tinning (i.e. by electrolytic galvanization) of the aluminum wire 1 obtained from the acid copper plating step, by moving the aluminum wire 1) through a tinning tank 8 containing a solution comprising methanesulfonic acid, methanesulfonic tin and preferably brightener, and having a temperature comprised between 15°C and 35°C and an applied voltage value comprised between 0,5V and 2,7V.
  • the tinning tank 8 is configured to allow the aluminum wire 1 to run through it, always keeping the aluminum wire 1 immersed in the solution of methanesulfonic acid, methanesulfonic tin and brightener.
  • the solution of methanesulfonic acid, methanesulfonic tin and brightener has a temperature comprised between 20°C and 30°C and an applied voltage value comprised between 1.2V and 1.6V, and has a concentration of methanesulfonic acid comprised between 90g/l and 100g/l and a concentration of methanesulfonic tin comprised between 20g/l and 55g/l and a concentration of brightener comprised between 1cm 3 /l and 2cm 3 /l.
  • the aluminum wire 1 is completely immersed in the solution of methanesulfonic acid, methanesulfonic tin and brightener when it runs inside the tinning tank 8.
  • the step of tinning the aluminum wire 1 is followed by a washing step, this washing step in turn preferably preceded by a pre-washing step of the aluminum wire 1.
  • the tinning tank 8 comprises means configured for measuring and regulating the temperature of the tinning solution contained in it.
  • the aluminum wire 1 is made to move continuously through the series of tanks comprising the pickling tank (4), the carburization tank (5), the alkaline copper plating tank (6), the acid copper plating tank (7) and the tinning tank 8 at a speed comprised between 30m/min and 70m/min.
  • the washing tank L there is a washing tank L, and a pre-washing tank (if foreseen) arranged before the washing tank L. Both the washing tank and the pre-washing tank are passed through by the aluminum wire that runs immersed in the respective washing and pre-washing solutions contained in them.
  • the alkaline copper plating tank 6, the acid copper plating tank 7 and the tinning tank 8 each comprise at least one electrode.
  • each electrode is an anode arranged on a basket containing copper or tin depending on the treatment tank.
  • An electric current is passed through the electrodes (e.g. anodes) and the predetermined voltage values are applied for the electrochemical treatment of the respective solutions contained in the treatment tanks.
  • the process comprises the step of circulating a current of intensity comprised between 120A and 220A in the electrode (e.g. anode).
  • the electrode e.g. anode
  • the intensity of the electrical current in the electrodes is dependent on the advancing speed of the wire.
  • the intensity of the electrical current in the electrodes is dependent on the advancing speed of the wire.
  • the process is in the succession of the following steps carried out in the following order: a) providing an aluminum wire 1; b) performing the pickling of the aluminum wire 1; c) performing the carburization of the aluminum wire 1 obtained from step b; d) performing the alkaline copper plating of the aluminum wire 1 obtained from step c; e) performing the acid copper plating of the aluminum wire 1 obtained from step d; f) performing the tinning of the aluminum wire 1 obtained from step e; g) winding the aluminum wire 1 obtained from step f) onto the second coil 3.
  • the wire continuously passes through the plurality of tanks in series in which the steps of the process listed above are performed in sequence.
  • each step is followed by at least one washing step that is performed in suitable washing tanks L arranged downstream of each treatment tank ( figure 2 ).
  • a plant 9 able to be used to perform the process described above is shown in figure 2 .
  • the plant 9 comprises a plurality of tanks that are mutually distinct and arranged in series.
  • the plurality of tanks comprises: a pickling tank 4 containing a pickling solution, a carburization tank 5 containing a carburization solution, an alkaline copper plating tank 6 containing an alkaline copper plating solution, an acid copper plating tank 7 containing an acid copper plating solution and a tinning tank 8 containing a tinning solution.
  • the alkaline copper plating tank 6, the acid copper plating tank 7 and the tinning tank 8 comprise at least one electrode each, preferably at least one anode each.
  • the plant 9 also comprises a first coil 2 of aluminum wire 1, and a second coil 3 operatively coupled with the first coil 2.
  • the second coil 3 is configured to rotate so as to pull and make the aluminum wire 1 move from the first coil 2 to the second coil 3, so as to unwind the aluminum wire 1 from the first coil 2 to wind it up on the second coil 3.
  • the first coil 2 and the second coil 3 are configured to move the aluminum wire 1 continuously through the plurality of tanks arranged in series.
  • the second coil 3 is set in rotation through an electric motor.
  • the first coil 2 is the coil with which the aluminum wire 1 to be treated with the process of the present invention is supplied, whereas the second coil 3 is the coil onto which the tinned aluminum wire according to the process of the present invention is wound.
  • the plurality of tanks comprises means adapted for keeping the aluminum wire 1 always immersed in the respective solutions contained in them.
  • the plurality of tanks comprises treatment tanks that are mutually separate and arranged in series. Each treatment tank is filled with a predetermined volume of a respective solution, and is configured both to allow the aluminum wire 1 to run inside it, and to keep the aluminum wire 1 immersed in the solution.
  • the speed of movement of the aluminum wire 1 can be adjusted during the operation of the plant 9 to determine the exposure time of the aluminum wire 1 to each solution.
  • the process foresees to perform a washing step of the aluminum wire 1 after each of the steps of the aforementioned process.
  • the liquids used in the washing steps are treated and purified through a demineralizing apparatus for example made up of a plurality of demineralisers (e.g. for tin, acid copper, alkaline copper, pickling and carburization) arranged near to the single washing tanks L.
  • a demineralizing apparatus for example made up of a plurality of demineralisers (e.g. for tin, acid copper, alkaline copper, pickling and carburization) arranged near to the single washing tanks L.
  • each washing step is preceded by a pre-washing step of the aluminum wire 1.
  • the washing step carried out after each treatment makes it possible both to eliminate the deposit of liquids on the aluminum wire 1, and to avoid carrying substances and consequently polluting the solutions contained in the subsequent tanks.
  • the washing step of the aluminum wire 1 is a critical aspect for the process, particularly relative to the first two pickling and carburization tanks 4,5.
  • a preferred embodiment of the plant 9 foresees the presence of a pre-washing
  • the pre-washing water of the first two baths being particularly critical, are replaced frequently.
  • the solutions are kept in separate storage tanks from the plurality of tanks of the plant 9.
  • the solutions are taken from the storage tanks through a system of pipes and valves, and taken into the respective treatment tanks.
  • the treatment tanks of the plant 9 are filled so that both the aluminum wire 1 to be treated and the anodes are perfectly immersed in the solutions contained in them.
  • the process object of the present invention makes it possible to make an aluminum wire 1 that is tinned uniformly, which has the following characteristics: good adherence of the copper-tin applied layer, adequate thickness of the coating and uniformity of the surface.
  • the process comprises a step in which the copper-tin applied layer is controlled with metallographic section.
  • the thickness of the copper layer that coats the aluminum wire 1 is comprised between 1 ⁇ m and 2 ⁇ m, whereas the thickness of the tin layer is comprised between 1 ⁇ m and 3 ⁇ m.
  • the exposure time of the aluminum wire 1 to the solutions contained in the tanks both by varying the advancement speed of the wire (i.e. through the rotation speed of the coils 2 and 3), and by suitably sizing the treatment tanks.
  • the thickness of the copper and tin layer by suitably adjusting the aforementioned parameters.
  • Accelerated corrosion tests were also carried out through the Machu test, also in this case on aluminum wires coated with copper-tin treated with different advancing speeds, obtaining positive results.
  • the plant 9 operates continuously. Indeed, before the first coil 2 to be treated has completely run out, it is possible to proceed to join the aluminum wire with a sacrificial wire or with an aluminum wire of the next coil through brass joins or through cold welding. In this way, it is possible to stable join the two ends of the two wires, aluminum-sacrificial or aluminum- aluminum. For example, during the passage of the sacrificial, the speed of the wire is reduced. In the case of the plant 9 being switched off for a medium-long time period (e.g. 2-3 days), the aluminum wire can be completely replaced by a sacrificial wire, so as to never lose the continuity of the production process.
  • an aluminum wire 1 that has tinning over the entire surface thereof, which protects the material from oxidation and makes it possible to have a better interface in the electrical contact area.
  • an aluminum wire 1 that is suitably sized to ensure comparable electrical performance to that of a copper wire, by performing a sizing of the diameter of the wire and of the thickness of the copper and tin coating layers.

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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)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Electroplating And Plating Baths Therefor (AREA)

Claims (9)

  1. Verfahren zur kontinuierlichen elektrochemischen Verzinnung von Aluminiumdrähten (1), umfassend folgende Schritte:
    a) - Bereitstellen von einem Aluminiumdraht (1),
    b) - Beizen des Aluminiumdrahtes (1) durch Bewegen des Aluminiumdrahtes (1) durch ein Beizbad (4), das eine Lösung aus Natronlauge und Glukonat enthält und eine Temperatur zwischen 40 °C und 80 °C aufweist,
    c) - Aufkohlen des aus Schritt b) erhaltenen Aluminiumdrahtes (1) durch Bewegen des Aluminiumdrahtes (1) durch ein Aufkohlungsbad (5), das eine Lösung aus Zink und Natronlauge enthält und eine Temperatur zwischen 15 °C und 50 °C aufweist,
    d) alkalisches Verkupfern des aus Schritt c) erhaltenen Aluminiumdrahtes (1) durch Bewegen des Aluminiumdrahtes (1) durch ein alkalisches Verkupferungsbad (6), das eine Lösung aus Kupfer und Leitsalzen enthält und eine Temperatur zwischen 50 °C und 70 °C sowie einen anliegenden Spannungswert zwischen 2 V und 4 V aufweist,
    e) saures Verkupfern des aus Schritt d) erhaltenen Aluminiumdraht (1) durch Bewegen des Aluminiumdrahtes (1) durch ein saures Verkupferungsbad (7), das eine Lösung aus Kupfersulfat und Schwefelsäure enthält und eine Temperatur zwischen 20 °C und 40 °C sowie einen anliegenden Spannungswert zwischen 0,8 V und 2 V aufweist,
    f) Verzinnen des aus Schritt e) erhaltenen Aluminiumdraht (1) durch Bewegen des Aluminiumdrahtes (1) durch ein Verzinnungsbad (8), das eine Lösung aus Methansulfonsäure und Zinn-Methansulfonat enthält und eine Temperatur zwischen 15 °C und 35 °C sowie einen anliegenden Spannungswert zwischen 0,5 V und 2,7 V aufweist.
  2. Verfahren nach Anspruch 1, wobei
    - die Lösung aus Natronlauge und Glukonat eine Konzentration zwischen 25 g/l und 35 g/l und eine Temperatur zwischen 50 °C und 70 °C aufweist,
    - der Aluminiumdraht (1) vollkommen in die Lösung aus Natronlauge und Glukonat eingetaucht ist.
  3. Verfahren nach Anspruch 1 oder 2, wobei
    - die Lösung aus Zink und Natronlauge Additive umfasst,
    - die Lösung aus Zink, Natronlauge und Additiven eine Konzentration zwischen 18 Vol.-% und 22 Vol.- % und eine Temperatur zwischen 20 °C und 45 °C aufweist,
    - der Aluminiumdraht (1) vollkommen in die Lösung aus Zink, Natronlauge und Additive eingetaucht ist.
  4. Verfahren nach einem der vorstehenden Ansprüche, wobei
    - die Lösung aus Kupfer und Leitsalzen eine Temperatur zwischen 60 °C und 65 °C und einen anliegenden Spannungswert zwischen 2,7 V und 3,2 V sowie eine Konzentration zwischen 14 g/l und 17 g/l und einen pH-Wert zwischen 8 und 9,5 aufweist,
    - der Aluminiumdraht (1) vollkommen in die Lösung aus Kupfer und Leitsalzen eingetaucht ist.
  5. Verfahren nach einem der vorstehenden Ansprüche, wobei
    - die Lösung aus Kupfersulfat und Schwefelsäure Additive umfasst,
    - die Lösung aus Kupfersulfat, Schwefelsäure und Additiven eine Temperatur zwischen 25 °C und 35 °C, einen anliegenden Spannungswert zwischen 1 V und 1,5 V und eine Konzentration an Kupfersulfat zwischen 180 g/l und 220 g/l und eine Konzentration an Schwefelsäure zwischen 60 g/l und 70 g/l und eine Konzentration an Additiven zwischen 2 cc/l und 3 cc/l aufweist,
    - der Aluminiumdraht (1) vollkommen in die Lösung aus Kupfersulfat, Schwefelsäure und Additive eingetaucht ist.
  6. Verfahren nach einem der vorstehenden Ansprüche, wobei
    - die Lösung aus Methansulfonsäure und Zinn-Methansulfonat Aufheller umfasst,
    - die Lösung aus Methansulfonsäure, Zinn-Methansulfonat und Aufheller eine Temperatur zwischen 20 °C und 30 °C, und einen anliegenden Spannungswert zwischen 1,2 V und 1,6 V, und eine Konzentration an Methansulfonsäure zwischen 90 g/l und 100 g/l, und eine Konzentration an Zinn-Methansulfonat zwischen 20 g/l und 55 g/l und eine Konzentration an Aufhellern zwischen 1 cc/l und 2 cc/l aufweist,
    - der Aluminiumdraht (1) vollkommen in die Lösung aus Methansulfonsäure, Zinn-Methansulfonat und Aufheller eingetaucht ist.
  7. Verfahren nach einem der vorstehenden Ansprüche, wobei auf jeden Schritt des Verfahrens wenigstens ein Reinigungsschritt des Aluminiumdrahtes (1) folgt.
  8. Verfahren nach einem der vorstehenden Ansprüche, wobei der Aluminiumdraht (1) kontinuierlich mit einer Geschwindigkeit von 30 m/min bis 70 m/min durch eine Mehrzahl von hintereinander angeordneten Bädern bewegt wird, wobei die Mehrzahl von Bädern das Beizbad (4) und das Aufkohlungsbad (5) und das alkalische Verkupferungsbad (6) und das saure Verkupferungsbad (7) und das Verzinnungsbad (8) umfasst.
  9. Verfahren nach einem der vorstehenden Ansprüche, wobei
    - das alkalische Verkupferungsbad (6) und das saure Verkupferungsbad (7) und das Verzinnungsbad (8) jeweils wenigstens eine Elektrode umfassen,
    - das Verfahren den Schritt des Zirkulierens von Strom in einer Stärke zwischen 120 A und 220 A in der wenigstens einen Elektrode umfasst.
EP16162541.3A 2015-05-11 2016-03-29 Verfahren zur kontinuirlichen elektrochemischen verzinnung von aluminiumdrähten Active EP3093376B1 (de)

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ITUB2015A000022A ITUB20150022A1 (it) 2015-05-11 2015-05-11 Processo per stagnatura elettrochimica in continuo di un filo di alluminio.

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CN107675222A (zh) * 2017-07-26 2018-02-09 张家港市亚亨金属制品有限公司 一种铝线的在线镀锡工艺

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US2509117A (en) * 1946-07-24 1950-05-23 Us Rubber Co Method of making composite wire
US3622470A (en) * 1969-05-21 1971-11-23 Wire & Strip Platers Inc Continuous plating method
GB1464048A (en) * 1975-10-17 1977-02-09 Ass Elect Ind Processes for the manufacture of aluminium articles coated with metals
FR2699321B1 (fr) * 1992-12-14 1995-03-10 Axon Cable Sa Procédé de fabrication en continu d'un conducteur électrique en aluminium cuivre et étame, et conducteur ainsi obtenu.

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