EP0357839B1 - Verfahren zur Elektroplattierung zon Zinn - Google Patents

Verfahren zur Elektroplattierung zon Zinn Download PDF

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Publication number
EP0357839B1
EP0357839B1 EP88201891A EP88201891A EP0357839B1 EP 0357839 B1 EP0357839 B1 EP 0357839B1 EP 88201891 A EP88201891 A EP 88201891A EP 88201891 A EP88201891 A EP 88201891A EP 0357839 B1 EP0357839 B1 EP 0357839B1
Authority
EP
European Patent Office
Prior art keywords
electrolyte
process according
current density
maintained
stannic
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 - Lifetime
Application number
EP88201891A
Other languages
English (en)
French (fr)
Other versions
EP0357839A1 (de
Inventor
Lucien Renard
Bruno Cauwe
René Winand
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.)
ArcelorMittal Liege Upstream SA
Original Assignee
Cockerill Sambre 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 Cockerill Sambre SA filed Critical Cockerill Sambre SA
Priority to DE8888201891T priority Critical patent/DE3881520D1/de
Priority to EP88201891A priority patent/EP0357839B1/de
Priority to AT88201891T priority patent/ATE90116T1/de
Publication of EP0357839A1 publication Critical patent/EP0357839A1/de
Application granted granted Critical
Publication of EP0357839B1 publication Critical patent/EP0357839B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

Definitions

  • the present invention relates to a process for the electrodeposition of tin.
  • the electrolyte used essentially contains stannous ions which oxidize in the air to stannic ions, forming sludge in the electrolysis cell.
  • composition of the electrolytic bath is generally relatively complex, implying a management of organic inhibitors which takes place in a fairly empirical manner.
  • One of the essential aims of the present invention is to remedy the drawbacks of these known methods and to propose a method making use of a bath of a very simple composition, requiring an extremely reduced control, while making it possible to obtain a very tinning valid and this in a very compact installation compared to known tinning installations.
  • an electrodeposition is carried out by making use of insoluble electrodes between which circulates, at a speed relative to the latter from 20 to 600 m / min., An electrolyte containing a concentration of stannic ions from 60 to 500 g / l and maintained at a temperature of 20 to 80 ° C, the current density between these electrodes being from 50 to 500 A / dm2.
  • an electrolyte in which at least 50% and preferably at least 99% of the tin present is in the form of stannic ions.
  • the present invention relates to a tinning process in an electrolytic bath based on stannic chloride without any other additive, more particularly without organic inhibitors working at a temperature of 20 to 80 ° C, with a speed of circulation of the electrolyte relative to the electrodes between 50 and 600 m / min., a current density of 50 to 500 A / dm2, using an insoluble anode Ti-IrO2 or Ti-RuO2 or in another substance compatible with chlorine ions.
  • This tinning process can, in principle, be carried out in any type of electrolysis cell where there is a large supply of electric current in the electrolysis zone and where the electrolyte is agitated. uniform, but still important to maintain a sufficiently large and uniform concentration of stannic ions near the electrodes during electrolysis.
  • An electrolysis cell is preferably used in which, opposite a insoluble anode, moves a relatively small distance from a strip of tin-plated steel forming a cathode office, in which an electrolyte circulates between these electrodes along the strip, and in which the cathode current distribution on the part of this strip moving from the electrolysis zone takes place as uniformly as possible, in order to create a diffusion limit current density high and substantially equal at each location in this part of the strip.
  • hydrochloric electrolyte essentially containing stannic ions and free from any organic inhibitor.
  • at least 50% and preferably at least 99% tin is present in the electrolyte in the form of stannic ions.
  • the current density is reduced eg, in certain cases, it could also be useful to reduce the flow rate of the electrolyte relative to the strip, so as to avoid the formation of a spongy deposit. If, on the other hand, the current density is increased, in some cases it might be useful to lower the flow rate of the electrolyte to avoid the formation of a powdery deposit.
  • the concentration in stannic ion in the electrolyte is advantageously maintained between 60 and 140 g / l and is preferably of the order of 100 g / l.
  • this concentration is less than 60 g / l, the cathodic yield may decrease too sharply and the deposits obtained could be pulverulent at high current densities. If, on the contrary, a concentration of stannic ions greater than 140 g / l is maintained, losses of tin due to the entrainment of the electrolyte by the strip to be covered may be too great.
  • this is advantageously maintained between 30 and 50 ° C and is preferably of the order of 40 ° C.
  • the conductivity of the electrolyte could become too low, which would increase the voltage between the anode and the cathode and therefore the specific energy consumption. If, on the other hand, this temperature is above 50 °, the dissolution of the iron in the strip in the electrolyte could become too great.
  • Such dissolution could take place when the strip remains in the electrolyte without electrolysis being started, for example in the event of a line stop.
  • the flow rate of the electrolyte relative to the strip is advantageously between 300 and 600 m / min and is preferably of the order of 400 m / min.
  • the flow rate of the electrolyte relative to the strip must be large, turbulent and uniform, so that the diffusion limit current density is not very dependent on the line speed, that is to say the speed of scrolling of the strip relative to the cell.
  • a continuous electrolysis cell with a high current density comprising fixed anodes and a mobile cathode, the latter cooperating with a cathode current supply of high capacity and able to move at a relatively small, substantially constant distance from the anode in an area in which the electrolyte can circulate for the transfer of tin to the strip to be covered.
  • the electrolyte consists of a solution of stannic chloride containing 100 g / l of stannic ions.
  • the current density was maintained at 200 A / dm2.
  • the temperature of the electrolysis bath was 40 ° C and the flow rate of the electrolyte relative to the strip was 400 m / min.
  • the thickness of the steel strip was 0.3 mm.
  • the weight of the tin deposit was substantially constant over the entire surface of the strip and was 11.2 g / m2.
  • the cathodic current efficiency was 98%
  • the anode-cathode voltage was 7.2 V, the anode-cathode distance being 5 mm.
  • the specific energy consumption was 6.6 kWh / kg of tin.
  • the deposit obtained was bright and compact.
  • Tin in stannous form in the electrolysis bath was only in trace amounts and the ratio between the concentration of stannous ions compared to the sum of the concentrations of stannous and stannous ions was greater than 99 %.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electroplating And Plating Baths Therefor (AREA)

Claims (11)

  1. Verfahren zur Elektroplattierung von Zinn unter Verwendung unlöslicher Elektroden und eines Elektrolyten, der bei einer Temperatur von 20 bis 80°C gehalten ist und Zinn(IV)-Ionen enthält,
    dadurch gekennzeichnet,
    daß man einen Elektrolyten benutzt, der 60 bis 500g/l Zinn (IV)-Ionen enthält und mit Bezug auf die Elektroden mit einer Relativgeschwindigkeit von 50 bis 600 m/min zirkuliert derart, daß eine Stromdichte von 50 bis 500 A/dm² anwendbar ist.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man einen Elektrolyten benutzt, in dem wenigstens 50 %, vorzugsweise wenigstens 99 % des vorhandenen Zinns in Form von Zinn(IV)-Ionen vorliegt.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß man eine Stromdichte von 100 bis 300 A/dm² anwendet.
  4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß man eine Stromdichte in der Größenordnung von 200 A/dm² anwendet.
  5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß man die Konzentration der Zinn(IV)-Ionen im Elektrolyten zwischen 60 und 140 g/l hält.
  6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß man die Konzentrationen der Zinn(IV)-Ionen in der Größenordnung von 100 g/l hält.
  7. Verfahren nach einem der Anspüche 1 bis 6, dadurch gekennzeichnet, daß man die Temperatur des Elektrolyten zwischen 30 und 50°C hält.
  8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß man die Temperatur des Elektrolyten in der Größenordnung von 40°C hält.
  9. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß man die Zirkulationsgeschwindigkeit des Elektrolyten zwischen 300 und 600 m/min hält.
  10. Verfahren nach Anspruch 9, dadurch gekennzeichnet, daß man die Zirkulationsgeschwindigkeit des Elektrolyten in der Größenordnung von 400 m/min hält.
  11. Verfahren nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß man einen Elektrolyten verwendet, der im wesentlichen frei von organischen Inhibitoren ist.
EP88201891A 1988-09-05 1988-09-05 Verfahren zur Elektroplattierung zon Zinn Expired - Lifetime EP0357839B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE8888201891T DE3881520D1 (de) 1988-09-05 1988-09-05 Verfahren zur elektroplattierung zon zinn.
EP88201891A EP0357839B1 (de) 1988-09-05 1988-09-05 Verfahren zur Elektroplattierung zon Zinn
AT88201891T ATE90116T1 (de) 1988-09-05 1988-09-05 Verfahren zur elektroplattierung zon zinn.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP88201891A EP0357839B1 (de) 1988-09-05 1988-09-05 Verfahren zur Elektroplattierung zon Zinn

Publications (2)

Publication Number Publication Date
EP0357839A1 EP0357839A1 (de) 1990-03-14
EP0357839B1 true EP0357839B1 (de) 1993-06-02

Family

ID=8199849

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88201891A Expired - Lifetime EP0357839B1 (de) 1988-09-05 1988-09-05 Verfahren zur Elektroplattierung zon Zinn

Country Status (3)

Country Link
EP (1) EP0357839B1 (de)
AT (1) ATE90116T1 (de)
DE (1) DE3881520D1 (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5403468A (en) * 1991-03-13 1995-04-04 Kawasaki Steel Corporation Process for the manufacture of tinplate using a fused tin chloride electroplating bath
BE1005730A4 (fr) * 1992-04-15 1993-12-28 Rech S Et Dev Du Groupe Cocker Procede d'electrodeposition d'etain et/ou d'alliages d'etain sur un support metallique.
AU2008211541B2 (en) 2007-01-29 2012-03-08 Powermat Technologies Ltd. Pinless power coupling
JP5483030B2 (ja) 2008-03-17 2014-05-07 パワーマット テクノロジーズ リミテッド 誘導伝送システム
CN102113068A (zh) 2008-06-02 2011-06-29 普迈公司 设备安装的功率出口
US8981598B2 (en) 2008-07-02 2015-03-17 Powermat Technologies Ltd. Energy efficient inductive power transmission system and method
US11979201B2 (en) 2008-07-02 2024-05-07 Powermat Technologies Ltd. System and method for coded communication signals regulating inductive power transmissions
US8188619B2 (en) 2008-07-02 2012-05-29 Powermat Technologies Ltd Non resonant inductive power transmission system and method
MX2011000002A (es) 2008-07-08 2011-06-01 Powermat Ltd Dispositivo de presentacion.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190005496A (en) * 1900-03-23 1900-06-02 Ernest Quintaine A Process for Depositing Pure Tin by Electrolysis.
US4013523A (en) * 1975-12-24 1977-03-22 Oxy Metal Industries Corporation Tin-gold electroplating bath and process
JPS59208094A (ja) * 1983-05-13 1984-11-26 Mitsubishi Chem Ind Ltd ブロンズ調鏡面製品

Also Published As

Publication number Publication date
ATE90116T1 (de) 1993-06-15
DE3881520D1 (de) 1993-07-08
EP0357839A1 (de) 1990-03-14

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