EP0094577A2 - Cathode for alkali metal chloride electrolysis, and manufacture thereof - Google Patents
Cathode for alkali metal chloride electrolysis, and manufacture thereof Download PDFInfo
- Publication number
- EP0094577A2 EP0094577A2 EP83104513A EP83104513A EP0094577A2 EP 0094577 A2 EP0094577 A2 EP 0094577A2 EP 83104513 A EP83104513 A EP 83104513A EP 83104513 A EP83104513 A EP 83104513A EP 0094577 A2 EP0094577 A2 EP 0094577A2
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- European Patent Office
- Prior art keywords
- nickel
- layer
- cathode
- aluminum
- powder
- Prior art date
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- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 title description 3
- 229910001514 alkali metal chloride Inorganic materials 0.000 title 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 90
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 21
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000007868 Raney catalyst Substances 0.000 claims abstract description 11
- 229910000564 Raney nickel Inorganic materials 0.000 claims abstract description 11
- 239000000843 powder Substances 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 7
- 239000003513 alkali Substances 0.000 claims abstract description 7
- 239000010959 steel Substances 0.000 claims abstract description 7
- 229910052742 iron Inorganic materials 0.000 claims abstract description 6
- 239000012528 membrane Substances 0.000 claims abstract description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 20
- 230000004913 activation Effects 0.000 claims description 9
- 238000005507 spraying Methods 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 3
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 claims description 3
- 238000007750 plasma spraying Methods 0.000 abstract description 3
- 239000011701 zinc Substances 0.000 abstract description 2
- 229910052725 zinc Inorganic materials 0.000 abstract description 2
- 235000010210 aluminium Nutrition 0.000 description 11
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- ZOMNIUBKTOKEHS-UHFFFAOYSA-L dimercury dichloride Chemical class Cl[Hg][Hg]Cl ZOMNIUBKTOKEHS-UHFFFAOYSA-L 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- -1 nickel / zinc Chemical compound 0.000 description 1
- 239000004482 other powder Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
- C25B11/04—Electrodes; Manufacture thereof not otherwise provided for characterised by the material
- C25B11/042—Electrodes formed of a single material
- C25B11/046—Alloys
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
- C25B11/04—Electrodes; Manufacture thereof not otherwise provided for characterised by the material
- C25B11/051—Electrodes formed of electrocatalysts on a substrate or carrier
- C25B11/073—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material
- C25B11/091—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material consisting of at least one catalytic element and at least one catalytic compound; consisting of two or more catalytic elements or catalytic compounds
Definitions
- the invention relates to a cathode for chlor-alkali electrolysis, in particular according to the diaphragm or membrane method, which has an activation layer made of Raney nickel on a support made of soft iron or steel.
- the invention further relates to a method for producing such cathodes.
- Cathodes of the type described in the introduction are commercially available.
- the Raney nickel activation layer is rolled on.
- the electrolyte liquor causes corrosion damage, which manifests itself, for example, in the formation of bubbles in the nickel layer as well as a partial solution of the nickel layer from the support and leads to flaking off of the nickel layer .
- Rolling the Raney nickel layer requires flat supports, which can only be deformed into the desired cathode shape after coating, which also means that flaking of the coating on curved cathode regions cannot be ruled out.
- the invention has for its object to provide a cathode for chlor-alkali electrolysis, which has a high corrosion resistance to the electrolyte solution, very low hydrogen deposition potentials and also a high adhesive strength of the activation layer on the carrier, even when the carrier is deformed.
- the activation layer consists of a 30 to 60 ⁇ m thick and dense nickel underlayer which is connected to the support and on which a porous Raney nickel cover layer with a rougher surface Surface and a layer thickness of 20 to 60 microns is attached.
- a method for the production of a cathode for chlor-alkali electrolysis, in particular according to the diaphragm or membrane method, with an activation layer of Raney nickel applied to a carrier made of soft iron or steel, a method has proven particularly useful, which is characterized in that the cleaned carrier surface first a 30 to 60 ⁇ m thick, dense nickel underlayer is sprayed on using the plasma jet process, then a 20 to 60 ⁇ m thick top layer is then sprayed on using the plasma jet process is sprayed on from a nickel-aluminum mixture with an aluminum content of 10 to 50%, the rest of nickel, from which the aluminum is then leached. 1N NaOH is preferably used to leach the aluminum.
- the method is particularly suitable for supports which are deformed into the desired cathode shape before being coated with the underlayer and the top layer.
- a nickel powder with a grain size in the range from 10 to 60 ⁇ m is preferably used for spraying on the underlayer.
- the use of a powder mixture of 50 parts of nickel and 50 parts of aluminum with a grain size in the range from 10 to 60 ⁇ m has proven useful for spraying on the top layer.
- the cathodes according to the invention showed only extraordinarily little corrosion damage when stored for 3 weeks in a current-free storage in a diaphragm cell solution with the composition 150 g / 1 NaOH + 130 g / 1 NaCl, while cathodes according to the prior art sometimes show strong detachment of the nickel layer, pitting and blistering through which the nickel layer partially flaked off.
- the cathodes showed similar results under operating conditions.
- the method according to the invention is suitable not only for the coating of planar supports, but in particular also for those supports which have already been deformed into the desired cathode shape before coating, because There are no difficulties due to the spraying on of both the bottom and the top layer by means of the plasma spraying method, since the plasma spraying jet also reliably reaches curved or bent surface parts of the carrier.
- FIG. 1 shows a section of an exemplary embodiment of a cathode according to the invention, FIG. 1 a showing a view and FIG. 1 b a vertical section along the plane A-B.
- the reference number 1 denotes the cathode in the figure. It consists, as can be seen from FIG. 1b, of a carrier 12 made of soft iron or steel, the lower layer 3 made of nickel layer sprayed on by means of the plasma jet method and the porous covering layer 4 made of Raney nickel produced thereon by the method according to the invention. It is clearly evident from the figures that the cover layer has a rough surface.
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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)
- Electrodes For Compound Or Non-Metal Manufacture (AREA)
- Coating By Spraying Or Casting (AREA)
- Electrolytic Production Of Metals (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
Kathode für die Chloralkali-Elektrolyse, insbesondere nach dem Diaphragma- oder Membranverfahren, mit einem Träger aus Weicheisen oder Stahl, einer darauf aufgebrachten 30 bis 60 µm dicken und dichten Nickel-Unterschicht, die mit einer porösen Raney-Nickel-Deckschicht mit rauher Oberfläche und einer Schichtdicke von 20 bis 60 µm bedeckt ist. Die Unter- und die Deckschicht werden mittels Plasmaspritzverfahren hergestellt, wobei zur Herstellung der Deckschicht ein Pulvergemisch aus Nickel und Aluminium-Pulver aufgespritzt wird, und das Aluminium anschliessend ausgelaugt wird. Anstelle des Aluminiums kann auch Zink verwendet werden.
Description
Die Erfindung bezieht sich auf eine Kathode für die Chloralkali-Elektrolyse, insbesondere nach dem Diaphragma- oder MembranVerfahren, die auf einem Träger aus Weicheisen oder Stahl eine Aktivierungsschicht aus Raney-Nickel aufweist. Ferner bezieht sich die Erfindung auf ein Verfahren zur Herstellung solcher Kathoden.The invention relates to a cathode for chlor-alkali electrolysis, in particular according to the diaphragm or membrane method, which has an activation layer made of Raney nickel on a support made of soft iron or steel. The invention further relates to a method for producing such cathodes.
Kathoden der eingangs charakterisierten Art sind handelsüblich. Bei diesen Kathoden ist die Aktivierungsschicht aus Raney-Nickel aufgewalzt. Bei diesen bekannten Kathoden ist nicht auszuschließen, daß durch die Elektrolytlauge Korrosionsschäden hervorgerufen werden, die sich beispielsweise in der Bildung von Blasen in der Nickel-Schicht souie einer teilweisen Lösung der Nickel-Schicht von dem Träger äußern und zu einem Abblättern der Nickel-Schicht führen. Das Aufwalzen der Raney-Nickel-Schicht setzt ebene Träger voraus, die erst nach der Beschichtung in die gewünschte Kathodenform verformt werden können, wodurch ebenfalls ein Abplatzen der Beschichtung an gekrümmten Kathodenbereichen nicht auszuschließen ist.Cathodes of the type described in the introduction are commercially available. In these cathodes, the Raney nickel activation layer is rolled on. With these known cathodes, it cannot be ruled out that the electrolyte liquor causes corrosion damage, which manifests itself, for example, in the formation of bubbles in the nickel layer as well as a partial solution of the nickel layer from the support and leads to flaking off of the nickel layer . Rolling the Raney nickel layer requires flat supports, which can only be deformed into the desired cathode shape after coating, which also means that flaking of the coating on curved cathode regions cannot be ruled out.
Der Erfindung liegt die Aufgabe zugrunde, eine Kathode für die Chloralkali-Elektrolyse zu schaffen, die eine hohe Korrosionsbeständigkeit gegen die Elektrolytlauge, sehr niedrige Wasserstoffabscheidungspotentiale und außerdem eine hohe Haftfestigkeit der Aktivierungsschicht auf dem Träger aufweist, selbst bei verformtem lräger.The invention has for its object to provide a cathode for chlor-alkali electrolysis, which has a high corrosion resistance to the electrolyte solution, very low hydrogen deposition potentials and also a high adhesive strength of the activation layer on the carrier, even when the carrier is deformed.
Gelöst wird diese Aufgabe für eine Kathode der eingangs charakterisierten Art erfindungsgemäß dadurch, daß die Aktivierungsschicht aus einer 30 bis 60 µm dicken und dichten Nickel-Unterschicht, die mit dem Träger verbunden ist, besteht, auf der eine poröse Raney-Nickel-Deckschicht mit rauher Oberfläche und einer Schichtdicke von 20 bis 60 µm angebracht ist.This object is achieved according to the invention for a cathode of the type characterized in the introduction in that the activation layer consists of a 30 to 60 μm thick and dense nickel underlayer which is connected to the support and on which a porous Raney nickel cover layer with a rougher surface Surface and a layer thickness of 20 to 60 microns is attached.
Weitere vorteilhafte Eigenschaften der erfindungsgemäßen Kathode ergeben sich aus den Unteransprüchen.Further advantageous properties of the cathode according to the invention result from the subclaims.
Zur Herstellung einer Kathode für die Chloralkali-Elektrolyse, insbesondere nach dem Diaphragma- oder Membranverfahren, mit einer auf einem Träger aus Weicheisen oder Stahl aufgebrachten Aktivierungsschicht aus Raney-Nickel hat sich insbesondere ein Verfahren bewährt, welches dadurch gekennzeichnet ist, daß auf die gereinigte Trägeroberfläche zunächst eine 30 bis 60 µm dicke, dichte Nickel-Unterschicht mittels Plasmastrahlverfahren aufgespritzt wird, auf die dann mittels Plasmastrahlverfahren eine 20 bis 60 µm dicke Deckschicht aus einem Nickel-Aluminium-Gemisch mit einem Aluminiumgehalt von 10 bis 50 %, Rest Nickel, aufgespritzt wird, aus der anschließend das Aluminium ausgelaugt wird. Zur Auslaugung des Aluminiums verwendet man vorzugsweise 1 n NaOH. Besonders geeignet ist das Verfahren für Träger, die vor der Beschichtung mit der Unterschicht und der Deckschicht in die gewünschte Kathodenform verformt werden. Zum Aufspritzen der Unterschicht wird vorzugsweise ein Nickelpulver einer Korngröße im Bereich von 10 bis 60 µm verwendet. Zum Aufspritzen der Deckschicht hat sich die Verwendung eines Pulvergemisches aus 50 Teilen Nickel und 50 Teilen Aluminium einer Korngröße im Bereich von 10 bis 60 p.m bewährt.For the production of a cathode for chlor-alkali electrolysis, in particular according to the diaphragm or membrane method, with an activation layer of Raney nickel applied to a carrier made of soft iron or steel, a method has proven particularly useful, which is characterized in that the cleaned carrier surface first a 30 to 60 µm thick, dense nickel underlayer is sprayed on using the plasma jet process, then a 20 to 60 µm thick top layer is then sprayed on using the plasma jet process is sprayed on from a nickel-aluminum mixture with an aluminum content of 10 to 50%, the rest of nickel, from which the aluminum is then leached. 1N NaOH is preferably used to leach the aluminum. The method is particularly suitable for supports which are deformed into the desired cathode shape before being coated with the underlayer and the top layer. A nickel powder with a grain size in the range from 10 to 60 μm is preferably used for spraying on the underlayer. The use of a powder mixture of 50 parts of nickel and 50 parts of aluminum with a grain size in the range from 10 to 60 μm has proven useful for spraying on the top layer.
Die erfindungsgemäßen Kathoden zeigten bei einer 3-wöchigen stromlosen Lagerung in einer Diaphragmenzellenlauge der Zusammensetzung 150 g/1 NaOH + 130 g/1 NaCl nur außerordentlich geringe Korrosionsschäden, während Kathoden gemäß dem Stand der Technik teilweise starke Ablösungen der Nickel-Schicht, Lochfraß sowie Blasenbildung aufwiesen, durch die die Nickel- schicht teilweise abplatzte. Ähnliche Ergebnisse zeigten die Kathoden unter Betriebsbedingungen. Messungen des Wasserstoff-Abscheidungspotentials ergaben, daß gegenüber Kathoden mit einer Aktivierungsschicht, die durch Spritzen von reinem Ni erzeugt wurden, die erfindungsgemäßen Kathoden bei 10 kA/m2 ein um etwa 50 bis 100 mV geringeres Potential aufwiesen, was zu erheblichen Energieeinsparungen beim Einsatz der erfindungsgemäßen Kathoden in der Chloralkali-Elektrolyse führt. Das niedrige Wasserstoffpotential erfindungsgemäßer Kathoden, das bei 10 kA/m2 etwa 1,25 V gegen gesättigte Kalomel-Elektrode beträgt, ist vermutlich auf die größere Oberfläche der porösen Raney-Nickel-Deckschicht zurückzuführen. Hervorzuheben ist, daß das erfindungsgemäße Verfahren sich nicht nur für die Beschichtung ebener Träger eignet, sondern insbesondere auch für solche Träger, die vor der Beschichtung bereits in die gewünschte Kathodenform verformt sind, weil durch das Aufspritzen sowohl der Unter- als auch der Deckschicht mittels Plasmaspritzverfahren keine Schwierigkeiten entstehen, da der Plasmaspritzstrahl auch gekrümmte oder geknickte Flächenteile des Trägers sicher erreicht.The cathodes according to the invention showed only extraordinarily little corrosion damage when stored for 3 weeks in a current-free storage in a diaphragm cell solution with the composition 150 g / 1 NaOH + 130 g / 1 NaCl, while cathodes according to the prior art sometimes show strong detachment of the nickel layer, pitting and blistering through which the nickel layer partially flaked off. The cathodes showed similar results under operating conditions. Measurements of the hydrogen deposition potential showed that compared to cathodes with an activation layer, which were produced by spraying pure Ni, the cathodes according to the invention had a potential which was about 50 to 100 mV lower at 10 kA / m 2 , which resulted in considerable energy savings when using the leads cathodes of the invention in chlor-alkali electrolysis. The low hydrogen potential of cathodes according to the invention, which is about 1.25 V against saturated calomel electrode at 10 kA / m 2 , is probably due to the larger surface area of the porous Raney nickel cover layer. It should be emphasized that the method according to the invention is suitable not only for the coating of planar supports, but in particular also for those supports which have already been deformed into the desired cathode shape before coating, because There are no difficulties due to the spraying on of both the bottom and the top layer by means of the plasma spraying method, since the plasma spraying jet also reliably reaches curved or bent surface parts of the carrier.
In der Figur 1 ist ein Ausschnitt eines Ausführungsbeispiels einer erfindungsgemäßen Kathode dargestellt, wobei Figur la eine Ansicht zeigt und Figur lb einen Vertikalschnitt entlang der Ebene A-B.FIG. 1 shows a section of an exemplary embodiment of a cathode according to the invention, FIG. 1 a showing a view and FIG. 1 b a vertical section along the plane A-B.
Mit der Bezugsziffer 1 ist in der Figur die Kathode bezeichnet. Sie besteht, wie sich aus der Figur Ib ergibt, aus einem Träger 12 aus Weicheisen oder Stahl, der auf diesen Träger aufgebrachten Unterschicht 3 aus mittels Plasmastrahlverfahren aufgespritzter Nickelschicht und der darauf angeordneten nach dem erfindungsgemäßen Verfahren hergestellten porösen Deckschicht 4 aus Raney-Nickel. Aus den Figuren ist deutlich ersichtlich, daß die Deckschicht eine rauhe Oberfläche aufweist.The
Die Herstellung der in der Figur dargestellten Kathode erfolgt beispielsweise wie folgt:
- Ein Träger aus Stahl wird zunächst an seiner Oberfläche durch Abstrahlen mit Aluminiumoxidpulver gereinigt. Danach wird die Nickel-Unterschicht mittels eines Plasmabrenners aufgespritzt, der mit Argon als Trägergas und Wasserstoff als Zusatzgas bei einem Druck von etwa 1,5 bar arbeitet.. Als Nickelpulver wird ein handelsübliches Pulver mit einer Korngröße im Bereich von 10 bis 60 µm verwendet. Nach Aufbringung der Nickel-Unterschicht wird die Nickelpulver-Zufuhr unterbrochen und der Plasmabrenner mit einem Pulver aus einem Gemisch aus Nickel- und Aluminium-Pulver mit 50 Teilen Nickel und 50 Teilen Aluminium gespeist und dieses Pulver aufgespritzt. Anstelle des Pulvers aus einem 50/50 Gemisch können auch Pulver mit der Gemischszusammensetzung Ni/Al 90/10, Ni/Al 80/20, Ni/Al 70/30, Ni/Al 60/40 verwendet werden. Die Kerngröße des vervendeten Nickel-Aluminium-Pulvergemisches liegt vorteilhafterweise im Bereich von 10 bis 60 gm. Nach dem Aufbringen der Deckschicht wird der beschichtete Träger zum Herauslösen des Aluminiums mittels 1 n NaOH behandelt, und zwar indem der beschichtete Träger solange in ein Laugebad getaucht wird, bis der Aluminium-Anteil aus der Deckschicht herausgelöst ist. Danach wird die Kathode mit Wasser gespült. Anstelle des Pulvergemisches aus Nickel und Aluminium können auch andere Nickel enthaltende Pulvergemische, wie beispielsweise Nickel/Zink, verwendet werden. Wichtig dabei ist, daß sich die dem Nickel beigemischte Komponente aus der gespritzten Deckschicht, ohne das Nickel und den Träger anzugreifen, herauslösen läßt. Anstelle von Natronlauge kann auch Kalilauge verwendet werden. Die Dicke der Deckschicht beträgt vorteilhafterweise 20 bis 40 µm.
- A steel beam is first cleaned on its surface by blasting with aluminum oxide powder. The nickel underlayer is then sprayed on using a plasma torch, which works with argon as the carrier gas and hydrogen as the additional gas at a pressure of about 1.5 bar. A commercially available powder with a grain size in the range from 10 to 60 μm is used as the nickel powder. After the nickel underlayer has been applied, the supply of nickel powder is interrupted and the plasma torch is fed with a powder composed of a mixture of nickel and aluminum powder with 50 parts of nickel and 50 parts of aluminum, and this powder is sprayed on. Instead of the powder from a 50/50 mixture, powders with the mixture composition Ni / Al 90/10, Ni / Al 80/20, Ni / Al 70/30, Ni / Al 60/40 can also be used. The core size of the nickel aluminum powder used The mixture is advantageously in the range from 10 to 60 gm. After the top layer has been applied, the coated support is treated with 1N NaOH to remove the aluminum, specifically by immersing the coated support in a lye bath until the aluminum content has been removed Top layer is detached. The cathode is then rinsed with water. Instead of the powder mixture of nickel and aluminum, other powder mixtures containing nickel, such as nickel / zinc, can also be used. It is important here that the component admixed to the nickel can be removed from the sprayed top layer without attacking the nickel and the carrier. Potassium hydroxide solution can also be used instead of sodium hydroxide solution. The thickness of the cover layer is advantageously 20 to 40 μm.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT83104513T ATE27188T1 (en) | 1982-05-15 | 1983-05-07 | CATHODE FOR CHLORALKALI ELECTROLYSIS AND PROCESS FOR PRODUCTION. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3218429 | 1982-05-15 | ||
| DE3218429A DE3218429C2 (en) | 1982-05-15 | 1982-05-15 | Process for producing a cathode for chlor-alkali electrolysis |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0094577A2 true EP0094577A2 (en) | 1983-11-23 |
| EP0094577A3 EP0094577A3 (en) | 1984-03-07 |
| EP0094577B1 EP0094577B1 (en) | 1987-05-13 |
Family
ID=6163756
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP83104513A Expired EP0094577B1 (en) | 1982-05-15 | 1983-05-07 | Cathode for alkali metal chloride electrolysis, and manufacture thereof |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0094577B1 (en) |
| JP (1) | JPS5941485A (en) |
| KR (1) | KR840004795A (en) |
| AT (1) | ATE27188T1 (en) |
| DE (2) | DE3218429C2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4595468A (en) * | 1984-07-19 | 1986-06-17 | Eltech Systems Corporation | Cathode for electrolysis cell |
| EP0762517A3 (en) * | 1995-09-11 | 1999-10-20 | Texas Instruments Incorporated | Improvements in or relating to semiconductor devices |
| EP1702681A2 (en) | 2005-03-08 | 2006-09-20 | H.C. Starck GmbH | Shaped catalytic body, more particularly used as hydrogenation catalyst |
| KR100772326B1 (en) * | 2000-02-15 | 2007-10-31 | 오투 마이크로, 인코포레이티드 | Audio controller for portable electronic devices |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2644617B2 (en) * | 1990-08-24 | 1997-08-25 | 日本碍子株式会社 | Hydrostatic gas bearing and its manufacturing method |
| RU2110619C1 (en) * | 1996-09-09 | 1998-05-10 | Закрытое акционерное общество "Техно-ТМ" | Electrode for electrochemical processes and method of manufacturing thereof |
| DE102024135929B3 (en) | 2024-12-03 | 2026-02-26 | Ks Gleitlager Gmbh | Electrode for alkaline water electrolysis, use of such an electrode, electrolysis cell comprising such an electrode, and method for manufacturing such an electrode |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1233834B (en) * | 1958-03-05 | 1967-02-09 | Siemens Ag | Electrode for electrolysers and fuel elements with a superficial double skeleton catalyst structure |
| US4049841A (en) * | 1975-09-08 | 1977-09-20 | Basf Wyandotte Corporation | Sprayed cathodes |
| US4024044A (en) * | 1975-09-15 | 1977-05-17 | Diamond Shamrock Corporation | Electrolysis cathodes bearing a melt-sprayed and leached nickel or cobalt coating |
| US4116804A (en) * | 1976-11-17 | 1978-09-26 | E. I. Du Pont De Nemours And Company | Catalytically active porous nickel electrodes |
| JPS54112785A (en) * | 1978-02-24 | 1979-09-03 | Asahi Glass Co Ltd | Electrode and manufacture thereof |
| DE2914094C2 (en) * | 1979-04-07 | 1983-02-10 | Kernforschungsanlage Jülich GmbH, 5170 Jülich | Porous nickel electrode for alkaline electrolysis, process for producing the same and its use |
| DE3277022D1 (en) * | 1981-06-01 | 1987-09-24 | Asahi Glass Co Ltd | Method for water electrolysis |
-
1982
- 1982-05-15 DE DE3218429A patent/DE3218429C2/en not_active Expired
-
1983
- 1983-05-07 EP EP83104513A patent/EP0094577B1/en not_active Expired
- 1983-05-07 DE DE8383104513T patent/DE3371544D1/en not_active Expired
- 1983-05-07 AT AT83104513T patent/ATE27188T1/en active
- 1983-05-14 KR KR1019830002092A patent/KR840004795A/en not_active Withdrawn
- 1983-05-16 JP JP58085657A patent/JPS5941485A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4595468A (en) * | 1984-07-19 | 1986-06-17 | Eltech Systems Corporation | Cathode for electrolysis cell |
| EP0762517A3 (en) * | 1995-09-11 | 1999-10-20 | Texas Instruments Incorporated | Improvements in or relating to semiconductor devices |
| KR100772326B1 (en) * | 2000-02-15 | 2007-10-31 | 오투 마이크로, 인코포레이티드 | Audio controller for portable electronic devices |
| EP1702681A2 (en) | 2005-03-08 | 2006-09-20 | H.C. Starck GmbH | Shaped catalytic body, more particularly used as hydrogenation catalyst |
| EP1702681A3 (en) * | 2005-03-08 | 2006-10-25 | H.C. Starck GmbH | Shaped catalytic body, more particularly used as hydrogenation catalyst |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3218429C2 (en) | 1987-03-19 |
| KR840004795A (en) | 1984-10-24 |
| EP0094577A3 (en) | 1984-03-07 |
| DE3371544D1 (en) | 1987-06-19 |
| JPS5941485A (en) | 1984-03-07 |
| ATE27188T1 (en) | 1987-05-15 |
| EP0094577B1 (en) | 1987-05-13 |
| DE3218429A1 (en) | 1983-12-01 |
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