EP3532657A1 - Procede et dispositif de regeneration de bain de platine - Google Patents
Procede et dispositif de regeneration de bain de platineInfo
- Publication number
- EP3532657A1 EP3532657A1 EP17794388.3A EP17794388A EP3532657A1 EP 3532657 A1 EP3532657 A1 EP 3532657A1 EP 17794388 A EP17794388 A EP 17794388A EP 3532657 A1 EP3532657 A1 EP 3532657A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- platinum
- bath
- stream
- reactor
- mixture
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D21/00—Processes for servicing or operating cells for electrolytic coating
- C25D21/16—Regeneration of process solutions
- C25D21/18—Regeneration of process solutions of electrolytes
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D21/00—Processes for servicing or operating cells for electrolytic coating
- C25D21/12—Process control or regulation
-
- 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
- C25D3/50—Electroplating: Baths therefor from solutions of platinum group 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
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
- C25D3/567—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of platinum group metals
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D21/00—Processes for servicing or operating cells for electrolytic coating
- C25D21/02—Heating or cooling
Definitions
- the present disclosure relates to the field of platinum baths for the production of platinum-based metal undercoat on a metal substrate, more particularly a platinum bath regeneration process by flow reaction, and a device of platinum bath regeneration.
- Turbomachine turbine blade parts made of superalloy are coated with a metal underlayer providing protection against oxidation / corrosion of the material.
- the blade parts may also comprise a ceramic layer acting as a thermal barrier.
- the metal underlayer then allows better attachment of the ceramic layer on the blade part.
- This metal sub-layer is produced in particular by an electrolytic platinum deposition from a platinum bath. A method of manufacturing such a bath, for the production of a platinum-based metal underlayer, is described for example in patent FR2989694.
- the platinum bath comprises one or platinum complexes which, under the effect of the electric current flowing through the bath, are deposited on the metal part to form the metal underlayer.
- platinum electrolytic deposition is stopped on the metal parts and the platinum bath is regenerated.
- this regeneration of the platinum bath is carried out by direct addition of platinum salts in the bath.
- the time of dissolution and stabilization of platinum salts in the bath is 24 to 48 hours.
- the production that is to say the deposition of metal sub-layers by platinum deposition, is interrupted. As a result, it increases the production time.
- the present disclosure relates to a platinum bath regeneration process by flow reaction, comprising successive steps of:
- the compound composed of the platinum bath, the withdrawal stream, the reactor and the regenerated bath stream. forms a circulation loop in which a fluid circulates.
- the term "fluid" means the liquid flowing in said loop, either in the platinum bath, in the withdrawal stream before regeneration, in the reactor or in the regenerated bath stream after regeneration.
- the withdrawal stream designates the fluid taken from the platinum bath, and flowing to the reactor in a pipe, for example.
- the regeneration solution stream designates a fluid having a predetermined platinum content, flowing to the reactor independently of the circulation loop defined above.
- the regeneration solution stream mixes with the withdrawal stream in the reactor.
- the regenerated bath stream refers to the fluid from the reactor resulting from mixing the draw stream with the regeneration solution stream and flowing to the platinum bath in a pipe, for example.
- the regeneration process can also be performed discontinuously.
- the regeneration process can be interrupted when no platinum sublayer deposition process is in progress, ie, depending on the regeneration requirements of the platinum bath, it is possible to stop the regeneration process, or stop the regeneration process when the platinum sublayer deposition process is in progress. It will be understood that the regeneration process can be carried out independently of carrying out the platinum sublayer deposition process.
- an intensified reactor for example, can, because of the small diameter of the channels component, to achieve a quick and effective mixture (only a few seconds), while having a small volume of fluid removed (And therefore a small percentage of fluid taken from the platinum bath which thus contains a globally constant amount of fluid), and a very good thermal control, thanks to the presence of heat transfer fluids. Furthermore, since the platinum bath is fed with platinum in the form of a platinum complex, the bath can be used to make deposits of platinum undercoat on a larger number of pieces than when the platinum is added under form of salts directly into the bath.
- the complexation step in the reactor comprises steps of:
- the complexation stage taking place in the reactor, is itself composed of at least three successive stages: the independent preheating currents, the mixing of currents, and the thermal conduct of the mixture obtained.
- Preheating can be achieved by a heat exchanger system comprising a heat transfer fluid.
- Thermal driving consists in keeping the temperature of the mixture at the predetermined value for a certain time, by measuring it, and regulating it if necessary.
- the formation of platinum complex can be optimum at a predetermined temperature, for example between 80 ° C and 90 ° C.
- Preheating the withdrawal stream and the regeneration solution stream independently of one another, enables both fluids to be brought to the desired temperature, before mixing, and thus to form the platinum complex.
- Thermal driving ensures that the resulting mixture is at the predetermined temperature, so that the platinum complex is well formed. For example, the temperature of the mixture can be measured at different reactor locations by means of thermocouples.
- the mixture is reduced to the temperature of the platinum bath in a tank disposed downstream of the reactor.
- upstream and downstream are considered in the direction of flow of the different currents.
- the mixture is reduced to the temperature of the platinum bath in a tank.
- This step allows the temperature of the regenerated bath stream, from the reactor and supplying the platinum bath, to be at the same temperature as the platinum bath. It is thus not necessary to interrupt the operation of the platinum bath to adjust it to the correct temperature. Indeed, for carrying out platinum sublayer deposition, the temperature of the platinum bath is optimized to obtain a desired yield.
- the feed rate of the reactor by the withdrawal stream is 80g / min
- the reactor feed rate by the regeneration solution stream is 10g / min.
- reactor feed rate by the withdrawal stream and the regeneration solution stream allows the resulting mixture, and thus the regenerated bath feed to the platinum bath, to have the concentration of the complex of platinum desired.
- the platinum concentration in the platinum bath is continuously maintained at a value in the range of 1 g / L, preferably 0.5 g / L, more preferably 0.1 g / L. Continuously supplying the platinum bath with a regenerated bath stream enables this bath to have a complexed platinum concentration within a given range, and thus to maintain a constant rate and deposition time.
- this process can be used to continuously maintain the platinum concentration in the bath at a constant value, to 0.1 g / L for example. Since the platinum concentration in the bath is continuously maintained at the desired value, it is possible to carry out platinum sublayer deposition without having to interrupt the deposition in order to regenerate the bath. The production yield is thus improved. Moreover, the speed and the deposition time can thus be constant during the life of the platinum bath.
- the temperature of the platinum bath is maintained at a value within a range of 4 ° C, preferably 2 ° C, more preferably 1 ° C, for example by a system of heating resistors .
- the present disclosure also relates to a platinum bath regeneration device in continuous flow, comprising:
- the compound composed of the platinum bath, the withdrawal stream, the intensified reactor and the regenerated bath stream form a circulation loop in which a fluid circulates.
- the intensified reactor being a distinct element of the platinum bath and external thereto, this device makes it possible to carry out the regeneration of said platinum bath, forming the platinum complex in the intensified reactor.
- the platinum bath thus remains available, which therefore makes it possible not to interrupt the production of platinum sublayers.
- this device makes it possible to maintain a relatively constant platinum concentration in the bath, and thus to maintain a constant rate and deposition time during the life of the bath.
- the mixture between the withdrawal stream and the regeneration solution stream, in the intensified reactor is carried out using a module comprising a stream in which the mixture circulates, and at least one stream in which circulates a coolant.
- This module may for example take the form of a superposition of plates, between which flow separately different currents. This allows effective mixing between the two fluids, while controlling the temperature of the latter, as well as the resulting mixture, to the desired temperature.
- the mixture between the withdrawal stream and the regeneration solution stream, in the intensified reactor is carried out using a mixer.
- the mixer may for example be a T-fitting which may have a passage diameter of a quarter of an inch.
- This type of mixer has the advantage of being simple, lightweight and inexpensive, and to achieve an effective mixture between the two fluids.
- the mixer is a Y-connector.
- FIG. 1 represents a schematic diagram of a platinum bath regeneration device according to the present disclosure
- FIG. 2 represents a schematic diagram of an intensified reactor according to the present disclosure
- FIG. 3 represents the various steps of a platinum bath regeneration process according to the present disclosure.
- FIG. 1 is a block diagram of a platinum bath regeneration device 100 according to the present disclosure.
- the device 100 comprises a platinum bath B filled at least in part with a fluid comprising one or platinum complexes for forming a metal underlayer. Under the effect of electric current while traversing the bath, platinum complexes are deposited on the metal part, for example a turbine engine blade part, to form the metal underlayer.
- the solution A is prepared and is added in the solution B' previously raised to 60 ° C.
- mixture A '+ B' (whose pH is previously adjusted to 6.3 by addition of a basic solution such as, for example, sodium hydroxide, potassium hydroxide, sodium triphosphate) is brought to 85 ° C for 3 hours. All solutions are covered during the heating stages.
- a basic solution such as, for example, sodium hydroxide, potassium hydroxide, sodium triphosphate
- the device 100 also comprises a withdrawal stream 1 flowing in a first pipe, a stream of regeneration solution 2 flowing in a second pipe, and an intensified reactor R.
- the platinum bath B and the intensified reactor R are connected The withdrawal stream 1 withdraws part of the platinum bath B to be regenerated and conveys it to the intensified reactor R, at a flow rate of 80 g / min, for example.
- a bath of regeneration solution S is connected to the intensified reactor R by the regeneration solution stream 2.
- the regeneration solution bath S has a platinum concentration of 10.5 g / l. This concentration corresponds to a flow rate of regeneration solution of 10 g / min.
- the regeneration solution stream 2 takes up part of the regeneration solution bath S and conveys it to the intensified reactor R. The withdrawal stream 1 and the regeneration solution stream 2 then mix in the intensified reactor R.
- a regenerated bath stream 3 circulates in a third pipe, and connects the intensified reactor R and the platinum bath B.
- the mixture between the withdrawal stream 1 and the regeneration solution stream 2, from the intensified reactor R is then conveyed to the platinum bath B.
- the assembly formed of the platinum bath B, the withdrawal stream 1, the intensified reactor R and the regenerated bath stream 3 forms a circulation loop of the platinum bath, passing from a state "bath to regenerate” in the withdrawal stream 1, in a "regenerated bath” state, in the regenerated bath stream 3.
- the intensified reactor R may be an intensified reactor including in particular a plurality of modules. Each of these modules comprises four glass plates superimposed on each other and, for example, brazed together, between which flow the different currents, and a heat transfer fluid.
- the channels formed between the plates, in which the different currents circulate, have diameters of passage of 0.5 to 20 mm This allows in particular effective heat transfer.
- the intensified reactor R thus comprises a first preheating module 10a for preheating the withdrawal stream 1, and a second preheating module 10b for preheating the regeneration solution stream 2.
- the preheating modules 10a and 10b each comprise an inlet and an exit.
- the temperature of the mixture between the streams is set at 80 ° C
- the flow rate of the withdrawal stream 1, supplying the first preheating module 10a is set at 80 g / min
- the flow rate of the regeneration solution stream 2, supplying the second preheating module 10b is set at 10 g / min.
- the first preheating module 10a thus makes it possible to preheat the withdrawal stream 1, in order to raise its temperature to at least 80 ° C., but remaining below 90 ° C.
- the second preheating module 10b preheats the stream of regeneration solution 2, in order to raise its temperature to at least 80 ° C, but remaining below 90 ° C.
- a coolant circulates between the plates of the first and second modules 10a and 10b, in order to raise the temperature of the mixture to this value between 80 ° C. and 90 ° C.
- the output of the first and second preheating modules 10a and 10b are connected to a mixer 20, wherein the withdrawal stream 1 and the regeneration solution stream 2 mix, thus reforming the platinum complex.
- the mixer 20 is a module comprising four glass plates brazed together between which circulate in particular and mix the two currents, and comprising two inputs and an output.
- a first inlet of the mixer 20 is fed by the preheated withdrawal stream 1, and a second inlet of the mixer 20 is supplied by the preheated regeneration solution stream 2.
- the output of the mixer 20 delivers the resulting mixture.
- a coolant also circulates between these plates, in order to maintain the temperature of the mixture to a value greater than 80 ° C, and less than 90 ° C.
- the mixer 20 may be a continuous mixer, for example a T-fitting, whose passage diameter is a quarter of an inch, and wherein a first inlet is fed by the preheated withdrawal stream 1, a second input is fed by the preheated regeneration solution stream 2, and an output delivers the resulting mixture.
- the mixture leaving the mixer 20 thus comprises the reformed platinum complex.
- the residence time of the mixture leaving the mixer 20, in the reactor R is set at a predetermined value, for example 6s.
- the reactor R comprises one or two control modules 30, similar to the preheating modules 10a and 10b and arranged in series, in which circulate the mixture from the mixer 20. These control modules 30 allow to increase the residence time of the mixture at 80 ° C in the reactor R, and thus complete the complexation of the mixture, if necessary.
- the reactor may also not include a control module 30, it may also include only one or include more than two.
- the reactor R also comprises temperature measuring means 50, which may be thermocouples, disposed at the output of the first and second preheating modules 10a and 10b, of the mixer 20 and of each driving module 30. These measuring means temperature 50 can control the temperature of the fluid at different points.
- the temperature measuring means 50 arranged downstream of the mixer 20, in the direction of fluid flow make it possible to ensure that the temperature of the mixture is at a temperature of 80 ° C., so that the platinum was well formed.
- a cryo-thermostat can also be placed at the outlet of the mixer, in order to regulate the temperature of the mixture.
- a tank 40 in which the mixture is temporarily stored is disposed downstream of the reactor R.
- this tank allows, for example by means of a cryothermostat, to readjust the temperature of the mixing at the temperature of the platinum bath B.
- the regenerated bath stream 3 leaving the reactor R, passing through the tank 40 and feeding the platinum bath B is at the optimum temperature to achieve this deposition of sub- platinum layer on metal parts.
- the platinum bath temperature B, for the formation of the underlayer is between 62 and 66 ° C, preferably between 63 and 65 ° C, more preferably between 63.5 and 64.5 ° C.
- the temperature of the regenerated bath stream in the tank 40 is lowered from 80 ° C to 64 ° C.
- the reservoir 40 may further comprise a mixer 42 for homogenizing the temperature of the mixture.
- Temperature measuring means 50 such as a thermocouple may also be disposed in the reservoir 40 to control the temperature of said reservoir.
- any evaporation of the platinum bath B is compensated by the fluid coming from the solution bath.
- S regeneration or by adding water in the platinum bath B.
- the method of regeneration of platinum bath by flow reaction, using the device 100, will be described in the following description, with reference to FIG. 3.
- the method comprises a fluid extraction step S1 in the platinum bath B, a complexing step S2, by mixing between the withdrawal stream 1 and the regeneration solution stream 2 in the reactor, and a step S3. supplying the platinum bath B with the mixture resulting from the complexing step S2.
- the complexing step S2 comprises different sub-steps performed in the reactor R.
- a preheating step S2-1 in which the withdrawal stream 1 and the regeneration solution stream 2 are preheated to 80 ° C. C independently of each other in the preheating modules 10a and 10b respectively.
- a mixing step S2-2 in which the withdrawal stream 1 and the regeneration solution stream 2 are mixed in the mixer 20.
- a thermal conducting step S2-3 in which the temperature of the mixture resulting from the step S2- 2 is controlled to ensure that it is equal to 80 ° C.
- the platinum concentration in the platinum bath B is maintained overall between 7.5 g / l and 8.5 g / l, that is to say in a range of 1 g / L, preferably between 7.7 g / L and 8.3 g / L, more preferably between 7.9 g / L and 8.1 g / L L.
- the process described above is carried out so that the platinum concentration remains in this range of values.
- this process can be implemented simultaneously with the deposition of platinum sublayers, so that the production is not interrupted during the regeneration, or when no deposit of platinum sublayers is In progress. This process can also be interrupted according to production needs.
- the platinum concentration is generally constant in the platinum bath, the time and the deposition rate of platinum sublayers can also be constant.
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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)
- Automation & Control Theory (AREA)
- Catalysts (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1660448A FR3058165B1 (fr) | 2016-10-27 | 2016-10-27 | Procede et dispositif de regeneration de bain de platine |
| PCT/FR2017/052857 WO2018078243A1 (fr) | 2016-10-27 | 2017-10-17 | Procede et dispositif de regeneration de bain de platine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3532657A1 true EP3532657A1 (fr) | 2019-09-04 |
| EP3532657B1 EP3532657B1 (fr) | 2020-11-25 |
Family
ID=58347484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP17794388.3A Active EP3532657B1 (fr) | 2016-10-27 | 2017-10-17 | Procede et dispositif de regeneration de bain de platine |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US10767276B2 (fr) |
| EP (1) | EP3532657B1 (fr) |
| CN (1) | CN109923244B (fr) |
| FR (1) | FR3058165B1 (fr) |
| WO (1) | WO2018078243A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102954650B1 (ko) * | 2021-03-22 | 2026-04-20 | 주식회사 포스코 | 황산계 철 전기도금용액의 제2철 이온 제거 방법 |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4160704A (en) * | 1977-04-29 | 1979-07-10 | Olin Corporation | In situ reduction of electrode overvoltage |
| US5135622A (en) * | 1991-12-02 | 1992-08-04 | At&T Bell Laboratories | Electrochemical synthesis of palladium hydroxide compounds |
| US6113769A (en) * | 1997-11-21 | 2000-09-05 | International Business Machines Corporation | Apparatus to monitor and add plating solution of plating baths and controlling quality of deposited metal |
| US6521112B1 (en) * | 1999-07-13 | 2003-02-18 | Dj Parker Company, Inc. | Paced chemical replenishment system |
| US6264806B1 (en) * | 1999-10-07 | 2001-07-24 | Technic Inc. | Plating fluid replenishment system and method |
| US6616828B2 (en) * | 2001-08-06 | 2003-09-09 | Micron Technology, Inc. | Recovery method for platinum plating bath |
| KR100363011B1 (en) * | 2002-03-28 | 2002-11-30 | Hanwha Chemical Corp | Electrolyte composition for electrolysis of brine and electrolysis method of brine using the same |
| DE102007003554A1 (de) * | 2007-01-24 | 2008-07-31 | Bayer Materialscience Ag | Verfahren zur Leistungsverbesserung von Nickelelektroden |
| FR2989694B1 (fr) | 2012-04-19 | 2015-02-27 | Snecma | Procede de fabrication d'un bain electrolytique pour la realisation d'une sous-couche metallique a base de platine sur un substrat metallique |
| WO2015002942A1 (fr) * | 2013-07-03 | 2015-01-08 | Tel Nexx, Inc. | Appareil de dépôt électrochimique et procédés de contrôle de la chimie à l'intérieur de ce dernier |
| CN104032332B (zh) * | 2014-06-04 | 2016-05-25 | 杭州三耐环保科技有限公司 | 一种底部进液循环高电流密度电解沉积金属的装置及实现方法 |
| CN105908247A (zh) * | 2016-05-16 | 2016-08-31 | 中国钢研科技集团有限公司 | 补充电镀锡液二价锡离子的电解溶锡装置及其系统和方法 |
-
2016
- 2016-10-27 FR FR1660448A patent/FR3058165B1/fr not_active Expired - Fee Related
-
2017
- 2017-10-17 WO PCT/FR2017/052857 patent/WO2018078243A1/fr not_active Ceased
- 2017-10-17 US US16/345,420 patent/US10767276B2/en active Active
- 2017-10-17 CN CN201780067242.4A patent/CN109923244B/zh active Active
- 2017-10-17 EP EP17794388.3A patent/EP3532657B1/fr active Active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018078243A1 (fr) | 2018-05-03 |
| CN109923244A (zh) | 2019-06-21 |
| US10767276B2 (en) | 2020-09-08 |
| EP3532657B1 (fr) | 2020-11-25 |
| CN109923244B (zh) | 2021-08-10 |
| US20190249327A1 (en) | 2019-08-15 |
| FR3058165B1 (fr) | 2018-12-14 |
| FR3058165A1 (fr) | 2018-05-04 |
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