EP2173928A1 - Installation et procédé pour l'étamage électrolytique de bandes d'acier, mettant en oeuvre une anode insoluble - Google Patents
Installation et procédé pour l'étamage électrolytique de bandes d'acier, mettant en oeuvre une anode insolubleInfo
- Publication number
- EP2173928A1 EP2173928A1 EP08827122A EP08827122A EP2173928A1 EP 2173928 A1 EP2173928 A1 EP 2173928A1 EP 08827122 A EP08827122 A EP 08827122A EP 08827122 A EP08827122 A EP 08827122A EP 2173928 A1 EP2173928 A1 EP 2173928A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- acid
- anode
- electrodialysis
- tin
- electrolytic solution
- 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
- 238000000034 method Methods 0.000 title claims abstract description 35
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 17
- 239000010959 steel Substances 0.000 title claims abstract description 17
- 239000002253 acid Substances 0.000 claims abstract description 82
- 238000000909 electrodialysis Methods 0.000 claims abstract description 72
- 239000003792 electrolyte Substances 0.000 claims abstract description 30
- 238000004070 electrodeposition Methods 0.000 claims abstract description 7
- 238000011084 recovery Methods 0.000 claims abstract description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 69
- 239000012528 membrane Substances 0.000 claims description 69
- 238000004090 dissolution Methods 0.000 claims description 44
- 239000008151 electrolyte solution Substances 0.000 claims description 41
- 238000009434 installation Methods 0.000 claims description 39
- 238000005868 electrolysis reaction Methods 0.000 claims description 31
- 125000002091 cationic group Chemical group 0.000 claims description 26
- 150000002500 ions Chemical class 0.000 claims description 24
- 125000000129 anionic group Chemical group 0.000 claims description 23
- 239000011248 coating agent Substances 0.000 claims description 19
- 238000000576 coating method Methods 0.000 claims description 19
- 238000007872 degassing Methods 0.000 claims description 14
- 238000009713 electroplating Methods 0.000 claims description 13
- 150000001875 compounds Chemical class 0.000 claims description 11
- 150000001450 anions Chemical class 0.000 claims description 9
- 239000008187 granular material Substances 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 6
- 229920003023 plastic Polymers 0.000 claims description 6
- 238000007747 plating Methods 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 5
- 239000004020 conductor Substances 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims description 2
- 239000012811 non-conductive material Substances 0.000 claims description 2
- 229920001225 polyester resin Polymers 0.000 claims description 2
- 239000004645 polyester resin Substances 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims description 2
- 239000000243 solution Substances 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 claims 1
- 238000010790 dilution Methods 0.000 claims 1
- 239000012895 dilution Substances 0.000 claims 1
- 230000005611 electricity Effects 0.000 claims 1
- 150000002431 hydrogen Chemical class 0.000 claims 1
- 239000000463 material Substances 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 description 7
- AFVFQIVMOAPDHO-UHFFFAOYSA-N Methanesulfonic acid Chemical compound CS(O)(=O)=O AFVFQIVMOAPDHO-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000011144 upstream manufacturing Methods 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- 150000007513 acids Chemical class 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 150000001768 cations Chemical class 0.000 description 3
- 229940098779 methanesulfonic acid Drugs 0.000 description 3
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 3
- IULJSGIJJZZUMF-UHFFFAOYSA-N 2-hydroxybenzenesulfonic acid Chemical compound OC1=CC=CC=C1S(O)(=O)=O IULJSGIJJZZUMF-UHFFFAOYSA-N 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- JXLHNMVSKXFWAO-UHFFFAOYSA-N azane;7-fluoro-2,1,3-benzoxadiazole-4-sulfonic acid Chemical compound N.OS(=O)(=O)C1=CC=C(F)C2=NON=C12 JXLHNMVSKXFWAO-UHFFFAOYSA-N 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 238000000502 dialysis Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 230000003134 recirculating effect Effects 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- BDHFUVZGWQCTTF-UHFFFAOYSA-N sulfonic acid Chemical compound OS(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-N 0.000 description 2
- 229910001432 tin ion Inorganic materials 0.000 description 2
- 239000005028 tinplate Substances 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000011034 membrane dialysis Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- AICMYQIGFPHNCY-UHFFFAOYSA-J methanesulfonate;tin(4+) Chemical compound [Sn+4].CS([O-])(=O)=O.CS([O-])(=O)=O.CS([O-])(=O)=O.CS([O-])(=O)=O AICMYQIGFPHNCY-UHFFFAOYSA-J 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- HXTSPGYEPSIZKP-UHFFFAOYSA-N phenol;tin Chemical compound [Sn].OC1=CC=CC=C1 HXTSPGYEPSIZKP-UHFFFAOYSA-N 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
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
- C25D17/002—Cell separation, e.g. membranes, diaphragms
-
- 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
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/30—Electroplating: Baths therefor from solutions of tin
-
- 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
- C25D7/0614—Strips or foils
- C25D7/0628—In vertical cells
Definitions
- the invention generally relates to insoluble anode electrolytic tinning of steel strips, and more particularly to an insoluble anode electrolytic tinning process and the installation for its implementation.
- the lack of toxicity of tin and the excellent protection against corrosion it brings to steel have long led to the use of tin-plated mild steel in the field of food packaging where it is known under the name of "tinplate”.
- the manufacture of tinplate is generally made from coils ("coils") of mild steel or ultra-soft, which previously undergo a hot rolling operation, followed by a cold rolling operation. At the end of these rolling operations, steel strips of a few tenths of a millimeter thick are obtained.
- These strips are then annealed, passed after annealing in a cold rolling mill ("skin passed"), degreased, etched and tinned by an electrolytic tinning process (or “electro-tinning”). Tinning is typically followed by finishing operations such as coating remelting, passivation, and oiling.
- Electro-tinning is a method of electrodepositing tin on a metal substrate, which consists in establishing the transfer of Sn 2+ stannous ions to the band to be coated according to the equilibrium: Sn 2+ + 2 e -> Sn deposited
- This reaction involves the availability of stannous ions in the bath.
- the bath has an acid for lowering the pH and increasing the electrical conductivity. It also contains additives that contribute, inter alia, to stabilize the stannous ions by preventing them from oxidizing, and to prevent the formation of stannic oxide sludge caused by the oxidation of these stannous ions.
- the first category of processes includes processes using a soluble anode, or so-called “soluble anode” processes
- the second category of processes includes processes implementing a insoluble anode, or so-called “insoluble anode” processes.
- soluble anode electro-tinning processes are carried out in electrolytic tinning installations which mainly use high purity tin anodes (ie anodes comprising at least 99.85% by weight of tin), which dissolve during electrolysis and charge the bath with stannous Sn 2+ ions.
- FIG. 1 An example of a "soluble anode” electro-tinning installation known to those skilled in the art is shown in FIG. 1.
- It is a vertical electro-tinning installation 1, in which a 2 to be coated in a coating tank 3 (or electrodeposition tank) by being wound on two conducting rollers 41, 42 and a bottom roller 5, thus forming a downstream strand 21 and a rising strand 22.
- the two conducting rollers 41, 42 feed the strip 2 with electrical current.
- the tin soluble anodes 61, 62 are disposed on either side of the falling 21 and up 22 strands of the steel strip 2 to be coated.
- This steel strip 2 is connected to the negative pole (represented by the symbol "-" in FIG. 1) of an electric current generator (not shown in FIG.
- insoluble anode electro-tinning processes
- the tin anode is replaced by an insoluble anode, for example a titanium anode with a coating of a metal (for example a metal of the platinum) or a metal oxide.
- the tin ions necessary for the coating are, in this case, derived from the electrolyte bath itself in the form of a compound of formula SnA 2 , A being an acid radical.
- the reactions taking place at the anode and at the cathode are obviously different: 1 at the cathode: SnA 2 + 2e " -> Sn + 2A " "at the anode: H 2 O -" ⁇ O 2 + 2H + + 2e "
- US Pat. No. 5,312,539 proposes another "insoluble anode" tinning process, which uses an anionic membrane dialysis cell and a separate tin dissolution unit in which tin is supplied as an oxide directly dissolved in the acid, or as a tin anode, which is dissolved electrolytically.
- Such a method has certain disadvantages, and in particular the cost of tin oxide and the need to create a strong concentration gradient across the membrane, which requires the implementation of a concentration unit.
- the necessary membrane surface (of the order of several thousand m 2 for continuous tinning installations of steel strips) makes the industrial application very problematic. .
- the subject of the present invention is therefore a method of electro-tinning and an installation for its implementation which remedy the drawbacks of the prior art, by the use of a specific electrodialysis cell, connected to the electroplating tray. on the one hand and the dissolution reactor on the other.
- the present invention relates to an installation for the electrolytic tinning of a continuously moving steel strip in at least one plating tank filled with an electrolytic solution which comprises an acid AH and Sn stannous ions 2+ in the form of a compound SnA 2 with A denoting an acid anion, said electrodeposition tank comprising an insoluble anode immersed in the solution electrolytic chamber of the electroplating tank and a cathode formed by the web in continuous flow in the electrolytic solution of the electroplating tank, said apparatus further comprising a tin dissolution reactor which comprises an insoluble cathode and at least one anode of soluble tin, and an electrodialysis cell, characterized in that the electrodialysis cell is an electrodialysis cell comprising a cathode compartment incorporating an insoluble cathode, an anode compartment incorporating an insoluble anode, at least two donor compartments.
- an electrolytic solution which comprises an acid AH and Sn stannous ions 2+ in the form of
- a first acid receiving compartment being adjacent to the anode compartment separated therefrom by an electrolysis membrane or cationic electrodialysis separation
- a first acid donor compartment being adjacent to the cathodic compartment by being separated by another membrane of electr or a cationic electrodialysis separator
- a second acid - donor compartment is adjacent to the first acid - receiving compartment separated therefrom by an anionic electrodialysis or electrolysis membrane
- a second acid - receiving compartment is adjacent, on the one hand, to the second acid donor compartment by being separated therefrom by a cationic electrodialysis or selective electrolysis membrane and, on the other hand, to the first or third acid donor compartment separated therefrom
- an electrodialysis or selective electrolysis membrane in the tin dissolution reactor, the tin anode and the insoluble cathode are separated by an anionic electrodialysis membrane defining a cathode zone integrating the cathode and an anode zone integrating the
- cationic electrodialysis membrane is understood to mean a membrane permeable to cations and which is typically used in an electrodialysis process.
- cationic electrolysis membrane is understood to mean a membrane permeable to cations typically used in a membrane electrolysis process, but which can advantageously be used in the electrodialysis process according to the invention. because of its robustness and ability to withstand higher current densities than a cationic electrodialysis membrane.
- a cationic electrodialysis membrane for separation electrolysis is understood to mean a membrane which is not permeable. anions and is able to withstand high current densities.
- a cationic membrane for electrodialysis or selective electrolysis is intended to mean a membrane which is not permeable to anions and which retains, for the most part, the cations
- an anionic membrane for electrolytic electrodialysis is understood to mean a membrane which is permeable to anions.
- the electrodialysis cell of the installation according to the invention makes it possible to considerably reduce the membrane surface required and to overcome a concentration gradient between the compartments.
- the amount of acid to be recovered can be more easily and quickly controlled by acting on the electrodialysis current.
- the presence of an anionic electrodialysis or electrolysis membrane in the dissolving reactor between the soluble anode of tin and the insoluble cathode allows the ions A " to pass through this membrane from the cathode zone to the cathode. the anodic zone, while the Sn 2+ ions produced at the anode remain totally in the anode zone of the reactor, the electrolytic solution contained therein is then recharged with stannous ions, and can then be directed back to the coating.
- the first and second recirculation circuits of the electrolytic solution comprise a common oxygen degassing tank, which is arranged upstream of the dissolution reactor in the direction of circulation of the electrolyte in this recirculation circuit.
- This degassing tank makes it possible to eliminate the gaseous oxygen formed at the insoluble anode of the coating tank.
- the acid AH is advantageously chosen from sulphonic acids.
- sulphonic acids that can be used according to the present invention, mention may be made especially of methanesulfonic acid and phenol-sulphonic acid.
- the preferred sulfonic acid is methane sulfonic acid.
- the SnA 2 compound will thus advantageously be a tin sulphonate corresponding to the preferred sulphonic acids according to US Pat. invention: tin phenol sulphonate or tin methane sulphonate.
- the present invention also relates to a process for the electrolytic tinning of a continuous strip of steel in at least one plating tank filled with an electrolytic solution which comprises an acid AH and stannous Sn 2+ ions under form of a compound SnA 2 with A denoting an acid anion, said tinning process employing a non-soluble anode and the metal strip constituting a cathode which are immersed in the electrolytic solution and between which a potential difference is applied, the SnA 2 compound from a tin dissolution reactor, which comprises an insoluble cathode and an anode of tin, between which a potential difference is applied, characterized in that the concentration of acid AH is maintained in the electrolytic solution of the tank by carrying out the following steps: a) the dissolution reactor is equipped with tin an anionic electrodialysis or electrolysis membrane between the tin anode and the insoluble cathode, thus defining a cathode zone integrating the insoluble cathode and an an
- FIG. 1 is a cross-sectional schematic diagram of an example of a soluble anode electro-tinning installation according to the state of the art
- FIG. 2 is a cross-sectional schematic diagram of an example of an insoluble anode electro-tinning installation according to the state of the art
- FIG. 3 is a cross-sectional schematic diagram of an example of FIG. installation of electro-tinning according to the invention
- FIG. 4 represents a schematic block diagram of the electrodialysis cell of the electro-tinning installation shown in FIG. 3
- FIG. 5 represents a cross-sectional diagram of an example of a dissolution reactor of an electro-tinning installation according to the invention
- FIG. 6 is a view from above of another example of a dissolution reactor of an electro-tinning installation according to the invention.
- the electro-tinning (or electrolytic tinning) installation shown in FIG. 1 is a soluble anode electro-tinning installation 1 of the state of the art, which was previously described in the reference to FIG. the prior art which precedes.
- the electro-tinning (or electrolytic tinning) installation shown in FIG. 2 is an insoluble anode electro-tinning installation 1 of the state of the art, which was previously described in the reference to FIG. the prior art which precedes.
- FIG. 3 shows a schematic diagram of an example installation according to the invention, in which the strip to be coated 20 and an insoluble anode 60 are partially immersed in an electroplating tank 30 (or coating tank). ) containing an electrolytic solution (or electrolyte) containing Sn 2+ stannous ions in the form of a SnA 2 compound and an AH acid, A being an acid anion.
- the SnA 2 compound comes from a tin dissolution reactor 10, which comprises an insoluble cathode 120 and a soluble tin anode 160, which are immersed in a tank 130 also containing the same electrolytic solution as the coating tank 30.
- An anionic electrodialysis or electrolysis membrane 140 is disposed between the electrodes 120, 160 of the reactor 10, so that the reservoir 130 of the reactor 10 is divided into a zone cathode 1200 containing the insoluble cathode 120 and anode zone 1600 containing the soluble anode 160.
- the anode 160 of the reactor 10 is constituted by pellets of tin 161 contained in a basket 162 (called
- Tin dissolving basket This basket 162 filled with granules 161 is connected to the positive pole (represented by the symbol “+” in FIG. 3) of a source of electric current (not represented in FIG. 3), the tin aggregates 161 playing the role soluble anode.
- the electro-tinning installation shown in FIG. 3 comprises, in addition to the coating tank 30 and the tin dissolution reactor 10, at least one electrodialysis cell 40 comprising: a cathode compartment 4200 integrating a insoluble cathode 420, an anode compartment 4600 incorporating an insoluble anode 460, a plurality of acid donor compartments 4400, a plurality of acid recipient compartments 4500, two cationic electrodialysis membranes 470 separated, one being disposed between the cathode compartment 4200 and the acid donor compartment 4400 immediately adjacent thereto, and the other being disposed between the anode compartment 4600 and the receiver compartment d 4500 acid immediately adjacent thereto, a plurality of anionic electrodialysis or electrolysis membranes 450 and a plurality of selective cationic electrodialysis
- FIG. 3 shows that the electroplating tank 30 and the anode zone 1600 of the tin dissolution reactor 10 are connected by a first circuit 200 for recirculating the electrolyte.
- the electrodeposition tank 30 is also part of a second recirculation circuit 300 of the electrolyte, which connects it to the plurality of acid donor compartments 4400 of the electrodialysis cell 40, while the plurality of receiver compartments.
- acid 4500 of the electrodialysis cell 40 are part of a third recirculation circuit 400 of the electrolyte.
- cathode compartments 4200 and anodic 4600 may be part of a fourth closed loop circulation circuit of an acidic solution, for example sulfuric acid (not shown in FIG. 3).
- This oxygen degassing tank 210 which here is for example common to the first and second circuits 200 and 300, is disposed downstream of the tank 30 in the direction of flow of the electrolytic solution in these circuits 200, 300, or in other words, upstream of the reactor 10 in the first circuit 200 and upstream of the electrodialysis cell 40 in the second circuit 300.
- the hydrogen degassing tank 410 is part of the third circuit 400 connecting the cathode zone 1200 of the dissolution reactor 10 to the plurality of compartments Acid receivers 4500 of the electrodialysis cell 40, the hydrogen degassing tank 410 being disposed upstream of the electrodialysis cell 40 in the direction of circulation of the electrolyte in the third circuit 400.
- An electrolyte depleted of stannous ions is thus obtained, part of which is taken from the coating tank 30, and is then subjected to degassing of the oxygen gas in the degassing tank 210 before being introduced into the anode zone 1600 of the reactor dissolution 10 on the one hand, and in the plurality of acid donor compartments 4400 on the other hand.
- a potential difference is applied simultaneously between the electrodes 420, 460 of the electrodialysis cell.
- the electrolyte from the coating tank 30 is introduced into the plurality of acid donor compartments 4400 delimited by a cationic membrane and an anionic membrane.
- the Sn 2+ ions of the electrolyte remain predominantly in the acid donor compartments while the acidic anions A ⁇ migrate to the acid recipient compartments 4500 through the anionic membranes and the H + ions migrate to the recipient compartments. 4500 acid through cationic membranes.
- CMX-S a selective cationic membrane 440 that can be used according to the invention
- CMX-S a selective cationic membrane 440 that can be used according to the invention
- a cationic separation membrane 470 the membrane marketed by the company TOKUYAMA SODA under the name C66 is recommended.
- Cationic membrane 440 has a selective permeability which permits the transfer of H + ions to the adjacent acid-receiving compartment and the retention of the majority of Sn 2+ ions in the acid-donor compartment as shown in Figure 4.
- the electrolytic dissolution of the tin granules 161 ensures the production of Sn 2+ stannous ions, which thanks to the impermeability of the Anionic membrane 140 remain largely in the vicinity of the anode.
- the A- ions which are released at the cathode of the reactor 10 pass from the cathode zone 1200 to the anode zone 1600 through the anionic membrane.
- the electrolyte of the anodic zone 1600 of the reactor 10 thus recharged with stannous ions can then be recovered and directed back to the coating tank.
- the electrolyte contained in the cathode zone 1200 of the reactor 10 is directed by the recirculation circuit 400 to the hydrogen degassing tank 410 and is introduced into the plurality of acid recipient compartments 4500 of the electrodialysis cell 40. .
- the electrodialysis cell 40 makes it possible to recover the excess electrolyte acid produced in the coating tank 30.
- the number of donor and acid recipient compartments and therefore the total membrane area required is a function of the amount of acid to be used. recover and applied current density.
- FIG. 5 shows an example of a dissolution reactor 10 according to the invention, comprising a tank 130 of cylindrical shape filled with electrolyte, and separated in two by an anionic electrodialysis membrane 140, also of a shape cylindrical, thus defining a central anode zone 1600 comprising the soluble anode 160, and an external cathode zone 1200 comprising the cathode 120.
- the cylindrical shape of the reservoir 130 and the cationic membrane 140 is given here by way of example. But, the reservoir 130 and the cationic membrane 140 may also be of parallelepipedal shape.
- the cathode 120 is connected to the negative pole of a source of electric current (represented by the symbol "-" in FIG. 5) and the anode 160 is connected, in its upper part, to the positive pole (represented by the symbol " + “In Figure 5) of the same source of electric current.
- FIG. 5 shows that the soluble anode of tin 160 comprises a dissolution basket 162 comprising tin granules 161.
- This basket 162 is divided into three distinct superimposed parts: a lower zone 1621 immersed in the electrolyte contained in the tank 130; a middle zone 1622 for recovering the electrolyte, which is situated above the lower zone 1621 by being contiguous thereto and which is not immersed in the electrolyte contained in the reservoir 130, but which is wetted by the electrolytic solution when circulated in circuit 200, and an upper dry zone 1623 for supplying dry tin granules 161 and transmitting electrical dissolution current.
- the lower 1621 and middle 1622 areas of the dissolution basket 162 of the anode 160 are both made of non-electrically conductive material.
- an electrically nonconductive material usable according to the invention for producing the lower zones 1621 and median 1622 of the basket 162 of the soluble anode 160 plastics, and composites such as the polyester resins and the polyesters, are recommended. polymers coated steels.
- the upper region 1623 for supplying tin granules 161 is made of an electrically conductive material.
- an electrically conductive material that can be used according to the invention to produce the basket 162 of the soluble anode 160 mention may notably be made of stainless steel.
- the lower zone 1621 immersed in the electrolyte comprises a mesh 163 comprising a mesh plastic mesh adapted to the retention of the tin granules, between 0.05 and 0.50 mm, and preferably between
- the median zone 1622 includes a recovery trough 164 of the regenerated electrolyte, this trough being supplied via a trellis 165
- the upper zone 1623 comprises a filling hopper 166 in tin granules 161, which is connected to the positive pole of the power supply.
- the lower zone 1621 of the basket 162, which is immersed in the electrolyte, is surrounded by a cationic membrane 140 of circular shape.
- This cationic membrane 140 is advantageously supported by at least one plastic net, which makes it possible to ensure the rigidity of the membrane 140.
- the electrolyte to be treated is introduced into the lower zone 1621 of the basket by intake ducts.
- the electric current ensures the dissolution of said granules 161 and the acid is charged with Sn ++ ions which remain close to the anode 160.
- the electrolyte thus recharged with tin is recovered at the trough 164, before being returned to the coating tank 30 via the return lines 202.
- FIG. 6 shows, in plan view, another example of a dissolution reactor 10 according to the invention, which comprises a plurality of soluble anodes 160, each having a basket 162 filled with tin granules 161, each basket 162 being surrounded by an anionic membrane 140 circular.
- a feed device 400 in granules 161 serves hoppers 166 of all baskets 162 of the dissolution reactor 10.
- This device 400 may be a treadmill or vibrating, or non-electrically conductive pipes.
- the device 400 acts intermittently as a function of a signal given by a device for detecting the level of granules in the hoppers 166, so as to maintain a constant level of granules 161 in the basket 162.
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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)
- Electroplating And Plating Baths Therefor (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0705563A FR2919619B1 (fr) | 2007-07-30 | 2007-07-30 | Installation et procede pour l'etamage electrolytique de bandes d'acier,mettant en oeuvre une anode insoluble |
| PCT/FR2008/000791 WO2009019333A1 (fr) | 2007-07-30 | 2008-06-09 | Installation et procédé pour l'étamage électrolytique de bandes d'acier, mettant en oeuvre une anode insoluble |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2173928A1 true EP2173928A1 (fr) | 2010-04-14 |
| EP2173928B1 EP2173928B1 (fr) | 2011-01-12 |
Family
ID=39253879
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP08827122A Not-in-force EP2173928B1 (fr) | 2007-07-30 | 2008-06-09 | Installation et procédé pour l'étamage électrolytique de bandes d'acier, mettant en oeuvre une anode insoluble |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2173928B1 (fr) |
| ES (1) | ES2359293T3 (fr) |
| FR (1) | FR2919619B1 (fr) |
| WO (1) | WO2009019333A1 (fr) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10011919B2 (en) * | 2015-05-29 | 2018-07-03 | Lam Research Corporation | Electrolyte delivery and generation equipment |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5318168B2 (fr) * | 1973-11-28 | 1978-06-13 | ||
| US4181580A (en) * | 1973-11-28 | 1980-01-01 | Nippon Steel Corporation | Process for electro-tin plating |
| JP2559935B2 (ja) * | 1991-12-20 | 1996-12-04 | 日本リーロナール株式会社 | 不溶性陽極を用いた錫又は錫ー鉛合金電気めっきの方法及び装置 |
| US5312539A (en) * | 1993-06-15 | 1994-05-17 | Learonal Inc. | Electrolytic tin plating method |
-
2007
- 2007-07-30 FR FR0705563A patent/FR2919619B1/fr not_active Expired - Fee Related
-
2008
- 2008-06-09 EP EP08827122A patent/EP2173928B1/fr not_active Not-in-force
- 2008-06-09 WO PCT/FR2008/000791 patent/WO2009019333A1/fr not_active Ceased
- 2008-06-09 ES ES08827122T patent/ES2359293T3/es active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2009019333A1 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2919619A1 (fr) | 2009-02-06 |
| ES2359293T3 (es) | 2011-05-20 |
| FR2919619B1 (fr) | 2009-10-09 |
| EP2173928B1 (fr) | 2011-01-12 |
| WO2009019333A1 (fr) | 2009-02-12 |
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