US3684577A - Removal of conductive coating from dimensionally stable electrodes - Google Patents
Removal of conductive coating from dimensionally stable electrodes Download PDFInfo
- Publication number
- US3684577A US3684577A US806343*A US3684577DA US3684577A US 3684577 A US3684577 A US 3684577A US 3684577D A US3684577D A US 3684577DA US 3684577 A US3684577 A US 3684577A
- Authority
- US
- United States
- Prior art keywords
- dimensionally stable
- conductive coating
- coating
- alkali metal
- electrode
- 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
Links
- 238000000576 coating method Methods 0.000 title abstract description 42
- 239000011248 coating agent Substances 0.000 title abstract description 34
- 150000003839 salts Chemical class 0.000 abstract description 28
- -1 ALKALI METAL SALT Chemical class 0.000 abstract description 14
- 150000008044 alkali metal hydroxides Chemical class 0.000 abstract description 13
- 229910052783 alkali metal Inorganic materials 0.000 abstract description 12
- 239000003795 chemical substances by application Substances 0.000 abstract description 2
- 239000007800 oxidant agent Substances 0.000 description 19
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 18
- 238000000034 method Methods 0.000 description 18
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 16
- 229910052719 titanium Inorganic materials 0.000 description 13
- 239000010936 titanium Substances 0.000 description 13
- 239000012799 electrically-conductive coating Substances 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 11
- 239000002184 metal Substances 0.000 description 11
- 239000000203 mixture Substances 0.000 description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 8
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 8
- 239000000758 substrate Substances 0.000 description 7
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 6
- 150000002739 metals Chemical class 0.000 description 6
- 229910000510 noble metal Inorganic materials 0.000 description 6
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 6
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 5
- 229910052715 tantalum Inorganic materials 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 239000000460 chlorine Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 229910052708 sodium Inorganic materials 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 238000005530 etching Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 3
- 229910052700 potassium Inorganic materials 0.000 description 3
- 239000011591 potassium Substances 0.000 description 3
- 235000010333 potassium nitrate Nutrition 0.000 description 3
- 239000004323 potassium nitrate Substances 0.000 description 3
- 235000010344 sodium nitrate Nutrition 0.000 description 3
- 239000004317 sodium nitrate Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- XTEGARKTQYYJKE-UHFFFAOYSA-M Chlorate Chemical class [O-]Cl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-M 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 241000519995 Stachys sylvatica Species 0.000 description 2
- 230000001464 adherent effect Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229960000443 hydrochloric acid Drugs 0.000 description 2
- 235000011167 hydrochloric acid Nutrition 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 150000002823 nitrates Chemical class 0.000 description 2
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical class OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 description 2
- 150000002978 peroxides Chemical class 0.000 description 2
- 159000000001 potassium salts Chemical class 0.000 description 2
- 229910052707 ruthenium Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- BZSXEZOLBIJVQK-UHFFFAOYSA-N 2-methylsulfonylbenzoic acid Chemical compound CS(=O)(=O)C1=CC=CC=C1C(O)=O BZSXEZOLBIJVQK-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 240000007930 Oxalis acetosella Species 0.000 description 1
- 235000008098 Oxalis acetosella Nutrition 0.000 description 1
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 1
- YRJOLBIHKAXHLB-UHFFFAOYSA-N [O-2].[Al+3].[O-2].[Ti+4].[Ru+]=O Chemical compound [O-2].[Al+3].[O-2].[Ti+4].[Ru+]=O YRJOLBIHKAXHLB-UHFFFAOYSA-N 0.000 description 1
- XBSYFVAKXHOPQK-UHFFFAOYSA-N [O-2].[Ti+4].[Ru+]=O Chemical compound [O-2].[Ti+4].[Ru+]=O XBSYFVAKXHOPQK-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910001508 alkali metal halide Inorganic materials 0.000 description 1
- 150000008045 alkali metal halides Chemical class 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 235000013405 beer Nutrition 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- FJIUUBZGIYMKFS-UHFFFAOYSA-N dioxoruthenium oxygen(2-) titanium(4+) Chemical compound [Ru](=O)=O.[O-2].[O-2].[Ti+4] FJIUUBZGIYMKFS-UHFFFAOYSA-N 0.000 description 1
- AXZAYXJCENRGIM-UHFFFAOYSA-J dipotassium;tetrabromoplatinum(2-) Chemical compound [K+].[K+].[Br-].[Br-].[Br-].[Br-].[Pt+2] AXZAYXJCENRGIM-UHFFFAOYSA-J 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 1
- IOTULWOIHWTUGW-UHFFFAOYSA-N iridium(3+) oxoruthenium(1+) oxygen(2-) titanium(4+) Chemical compound [Ir+3].[O-2].[Ti+4].[Ru+]=O.[O-2].[O-2].[O-2] IOTULWOIHWTUGW-UHFFFAOYSA-N 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229910001487 potassium perchlorate Inorganic materials 0.000 description 1
- 239000012286 potassium permanganate Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 229910001925 ruthenium oxide Inorganic materials 0.000 description 1
- WOCIAKWEIIZHES-UHFFFAOYSA-N ruthenium(iv) oxide Chemical compound O=[Ru]=O WOCIAKWEIIZHES-UHFFFAOYSA-N 0.000 description 1
- 239000011833 salt mixture Substances 0.000 description 1
- PFUVRDFDKPNGAV-UHFFFAOYSA-N sodium peroxide Chemical compound [Na+].[Na+].[O-][O-] PFUVRDFDKPNGAV-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910001936 tantalum oxide Inorganic materials 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
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
Definitions
- these dimensionally stable electrodes consist of a conductive coating upon a titanium or tantalum substrate.
- a conductive coating upon a titanium or tantalum substrate.
- Another object of the present invention is to provide a United States Patent ice method for removing the electrically conductive coating from a dimensionally stable electrode in such a manner that the valuable constituents of said coating may be recovered.
- a further object of the present invention is to provide a method for the removal of the conductive coating from a dimensionally stable electrode, which method results in a clean structure on which a new conductive coating may be applied with excellent adherence.
- a still further object of the invention is to provide a method which rapidly removes the conductive coating from a dimensionally stable electrode with a minimum of damage to the electrode substrate.
- the conductive coating may be rapidly and efliciently removed from a dimensionally stable electrode, without substantial detrimental effect to the electrode structure itself, by contacting the dimensionally stable electrode with a molten salt bath consisting of a mixture of from 1 to 15 parts by weight of an alkali metal hydroxide and one part by weight of an alkali metal salt of an oxidizing agent. Upon removal from contact with the molten salt bath, cooling and rinsing any adherent fused salt from the electrode structure, said structure is suitable for etching and application of a new electrically conductive coating.
- a molten salt bath consisting of a mixture of from 1 to 15 parts by weight of an alkali metal hydroxide and one part by weight of an alkali metal salt of an oxidizing agent.
- alkali metal hydroxide in the specification and claims it is intended to refer to the hy droxides of sodium, potassium and lithium or mixtures thereof, notably sodium and potassium hydroxide and preferably potassium hydroxide.
- this alkali metal hydroxide will be present within the range of l to 15 parts of alkali metal hydroxide per 1 part of oxidizing agent, all parts by weight. At this time the preferred range is from 3:1 to 10:1.
- a typical and especially preferred bath consists of 5 parts of potassium hydroxide and 1 part of an alkali metal salt of an oxidizing agent.
- alkali metal salt of an oxidizing agent is intended to refer to the sodium, potassium and lithium salts of such agents.
- sodium and potassium salts are preferred, with potassium being especially preferred at this time.
- the oxidizing portion, or anion, of the salt is selected from the group consisting of nitrates, chlorates, peroxides, permanganates and perchlorates.
- suitable oxidizing agents are potassium nitrate, sodium nitrate, sodium chlorate, potassium perchlorate, potassium permanganate, sodium peroxide, and the like. Obviously, mixtures of oxidizing agents may be used in many instances. Especially preferred at this time are sodium and potassium nitrate.
- An advantage of the present invention which requires that at least a 1:1 ratio of ingredients be used, and preferably a large excess of hydroxide, is that the cost of the hydroxide is far less than that of the oxidizing agent.
- dimensionally stable electrodes is used throughout the specification and claims and is intended to refer primarily to titanium or tantalum structures carrying an electrically conductive coating.
- alloys of these metals are also useful, as are other conductive metals, such as copper and aluminum, clad or coated with titanium, tantalum or alloys thereof.
- Other valve metals not adversely affected by the molten salt bath may also be used in special applications.
- These electrode structures are generally in the form of a solid sheet, a perforated or slotted sheet, or an expanded mesh configuration, although the shape of the electrode has no bearing upon the practice of the present invention.
- the identity of the electrically conductive coating is likewise not critical to the practice of the present invention, that is, a variety of electrically conductive coatings may be removed by this technique.
- noble metal coatings such as platinum, palladium, iridium and ruthenium metals and alloys thereof are rapidly and readily removed according to the invention.
- oxide, or ceramic, coatings are also effectively and efliciently removed.
- These latter coatings include, in addition to the oxides of the noble metals themselves, mixtures of oxides of noble metals with oxides of valve metals (e.g., titanium, tantalum, aluminum); mixtures of oxides of noble metals, valve metals and other metals; as well as mixtures of certain of the foregoing oxides with noble metals in the metallic form.
- examples of such coatings include: ruthenium oxide; ruthenium oxide-titanium oxide; ruthenium oxide-titanium oxide-aluminum oxide; ruthenium oxide-titanium oxide-iridium; ruthenium oxidetitanium oxide-tantalum oxide, and others.
- a significant advantage of the present invention lies in the fact that, despite the speed of the stripping operation and the fact that a variety of coatings may be removed with equal ease and effectiveness, substantially no damage is incurred by the titanium or tantalum structure itself. Thus, experience to date has shown that less than 5 percent, and generally less than 2 percent, by weight of the metal is lost from the structure itself in each case.
- the electrode is removed from the molten salt bath and, after cooling, the fused salt adhering to the electrode structure may be readily removed by rinsing in water to dissolve the salt.
- the electrically conductive coating stripped from the dimensionally stable electrode remains in the molten salt bath and at periodic intervals the components of the coating may be recovered in a variety of ways, provided of course that they are of such a nature as to be worth the cost of a recovery operation.
- An especially preferred manner of providing the salt bath in condition for economical recovery of the coating constituents involves the concentration of these constituents to a maximum level.
- EXAMPLE 1 An anode comprising an expanded titanium mesh substrate having deposited thereon an electrically conductive coating of ruthenium dioxide-titanium dioxide, is first cleaned of extraneous material such as cell putty, salt and the like and thereafter heated to dryness. The structure is then immersed in a clear salt bath containing 5 parts by weight of KOH and 1 part by weight of KNO and maintained at a temperature of 450 C. (1-20" C.). A nickel tank is used to prevent corrosion. After 5 minutes in the molten salt bath, the anode structure is carefully removed, the still molten salt is permitted to drain back into the melt, and the anode is allowed to cool, at which time any adhering fused salt is removed by rinsing in Water. Upon examination, the surface of the titanium is seen to be bright, smooth and uniform.
- the thus-cleaned structure is then etched prior to the application of a. fresh coating of electrically conductive material and it is found that only a 10 minute etch in boiling, azeotropic, hydrochloric acid is required, compared with the normal 45-60 minute etch used when initially preparing the titanium for coating.
- Example 1 An expanded titanium mesh anode having a platinum metal coating thereon is cleaned and dried as in Example 1.
- the molten salt bath is a mixture of 5 parts of sodium hydroxide and 1 part of sodium nitrate maintained at a temperature of about 350 C.
- the structure is removed from the melt, cooled and rinsed with water as before, at which time it is noticed that the surface of the mesh is perfectly clean with the exception of a few scattered white spots.
- the weight loss on the substrate during stripping is determined to be 2.1 percent.
- the white spots disappear and the cleaned, etched structure is totally acceptable for recoating with an electrically conductive material.
- a method for removing the electrically conductive coating from a dimensionally stable titanium electrode structure which method comprises contacting said structure with a molten salt bath consisting of a mixture of from 1 to 15 parts by weight of an alkali metal hydroxide and 1 part by weight of an alkali metal salt of an oxidizing agent, for a period of time sufficient to effect removal of said coating.
- alkali metal hydroxide is selected from the group consisting of potassium hydroxide and sodium hydroxide and the alkali metal salt of the oxidizing agent is selected from the group consisting of sodium and potassium salts of nitrates, chlorates, perchlorates, permanganates and peroxides.
- a method for removing the electrically conductive coating from a dimensionally stable titanium electrode structure by stripping said coating from said electrode structure in a molten salt bath containing from 1 to 15 parts by weight of an alkali metal hydroxide and 1 part by Weight of an alkali metal salt of an oxidizing agent and recovering the thus-stripped coating which method includes the step of increasing the concentration of the stripped coating in the molten salt bath by periodic additions of the hydroxide and oxidizing agent as the bath becomes depleted in these components.
- a method for removing the electrically conductive coating from a dimensionally stable titanium electrode structure by stripping said coating from said electrode structure in a molten salt bath containing from 1 to 15 parts by weight of an alkali metal hydroxide and 1 part by weight of an alkali metal salt of an oxidizing agent which method includes the step of recovering the stripped coating from the salt bath.
Landscapes
- 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)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Electrolytic Production Of Metals (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US80634369A | 1969-02-24 | 1969-02-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3684577A true US3684577A (en) | 1972-08-15 |
Family
ID=25193840
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US806343*A Expired - Lifetime US3684577A (en) | 1969-02-24 | 1969-02-24 | Removal of conductive coating from dimensionally stable electrodes |
Country Status (10)
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3837879A (en) * | 1971-04-21 | 1974-09-24 | Solvay | Removing of worn coating from metal electrodes |
| US4379723A (en) * | 1980-08-28 | 1983-04-12 | C. Conradty Nurnberg Gmbh & Co. Kg | Method of removing electrocatalytically active protective coatings from electrodes with metal cores, and the use of the method |
| US5141563A (en) * | 1989-12-19 | 1992-08-25 | Eltech Systems Corporation | Molten salt stripping of electrode coatings |
| CN112795932A (zh) * | 2020-12-18 | 2021-05-14 | 西安泰金工业电化学技术有限公司 | 一种去除钛阳极表面涂层的方法 |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5339251U (enrdf_load_html_response) * | 1976-09-09 | 1978-04-05 | ||
| JPS5461256U (enrdf_load_html_response) * | 1977-10-07 | 1979-04-27 | ||
| JPS60192379U (ja) * | 1984-05-30 | 1985-12-20 | 日本電気株式会社 | プリント基板用電源接続器 |
| JPH071547U (ja) * | 1993-06-15 | 1995-01-10 | 株式会社フジソク | スイッチ装置 |
| CA2730558C (en) † | 2002-11-29 | 2011-11-15 | Mitsubishi Materials Corporation | Separation process for platinum group elements |
-
1969
- 1969-02-24 US US806343*A patent/US3684577A/en not_active Expired - Lifetime
-
1970
- 1970-02-18 CA CA075176A patent/CA920924A/en not_active Expired
- 1970-02-23 BE BE746347D patent/BE746347A/xx unknown
- 1970-02-23 GB GB1297301D patent/GB1297301A/en not_active Expired
- 1970-02-23 SE SE02240/70A patent/SE360279B/xx unknown
- 1970-02-23 FR FR7006301A patent/FR2032957A5/fr not_active Expired
- 1970-02-23 LU LU60393D patent/LU60393A1/xx unknown
- 1970-02-23 DE DE2008335A patent/DE2008335B2/de active Pending
- 1970-02-24 JP JP45015304A patent/JPS4815144B1/ja active Pending
- 1970-02-24 NL NL7002608A patent/NL7002608A/xx unknown
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3837879A (en) * | 1971-04-21 | 1974-09-24 | Solvay | Removing of worn coating from metal electrodes |
| US4379723A (en) * | 1980-08-28 | 1983-04-12 | C. Conradty Nurnberg Gmbh & Co. Kg | Method of removing electrocatalytically active protective coatings from electrodes with metal cores, and the use of the method |
| US5141563A (en) * | 1989-12-19 | 1992-08-25 | Eltech Systems Corporation | Molten salt stripping of electrode coatings |
| CN112795932A (zh) * | 2020-12-18 | 2021-05-14 | 西安泰金工业电化学技术有限公司 | 一种去除钛阳极表面涂层的方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS4815144B1 (enrdf_load_html_response) | 1973-05-12 |
| BE746347A (fr) | 1970-08-24 |
| SE360279B (enrdf_load_html_response) | 1973-09-24 |
| CA920924A (en) | 1973-02-13 |
| LU60393A1 (enrdf_load_html_response) | 1971-06-22 |
| GB1297301A (enrdf_load_html_response) | 1972-11-22 |
| DE2008335A1 (de) | 1970-10-08 |
| DE2008335B2 (de) | 1973-12-20 |
| FR2032957A5 (enrdf_load_html_response) | 1970-11-27 |
| NL7002608A (enrdf_load_html_response) | 1970-08-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: ELECTRODE CORPORATION, A DE CORP., OHIO Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:DIAMOND SHAMROCK TECHNOLOGIES, S.A.;REEL/FRAME:005004/0145 Effective date: 19881026 |