FR2354399A1 - Sulpho:chromic and/or phospho:chromic regeneration cell - converts trivalent chromium to hexavalent state with controlled chromium migration - Google Patents
Sulpho:chromic and/or phospho:chromic regeneration cell - converts trivalent chromium to hexavalent state with controlled chromium migrationInfo
- Publication number
- FR2354399A1 FR2354399A1 FR7617894A FR7617894A FR2354399A1 FR 2354399 A1 FR2354399 A1 FR 2354399A1 FR 7617894 A FR7617894 A FR 7617894A FR 7617894 A FR7617894 A FR 7617894A FR 2354399 A1 FR2354399 A1 FR 2354399A1
- Authority
- FR
- France
- Prior art keywords
- chromic
- chromium
- compartment
- sulpho
- phospho
- 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
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/1601—Process or apparatus
- C23C18/1617—Purification and regeneration of coating baths
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Electroplating And Plating Baths Therefor (AREA)
- Chemically Coating (AREA)
Abstract
A cathode compartment in an electrolytic cell for the regeneration of waste sulphochromic and/or phosphochromic solns. is described. The compartment is pref. a vertical parallelepiped open only at the top and consists of a solid support material chemically inert to the electrolyte and a good electrical insulator. In the support are cut-outs or windows fluid tightly equipped with occulation elements composed of a material with a very high resistance to oxidising and reducing agents in a highly acid medium and at temps. =110-120 degrees C a porosity of 0.02-50 mu, pref. 0.02-15 mu and an electrical resistance of 0.2 omhs/dm2 and a strength able to support a min. pressure difference of 0.2 kg/cm2. The electrolytic cell is used to regenerate solns. from Cr plating or pickling operations esp. etchants used in plastics plating processes. The compartment can have dimensions which vary within large limits and may be used in (dis)continuous processer. The components are easily mfrd. and replaced.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7617894A FR2354399A1 (en) | 1976-06-11 | 1976-06-11 | Sulpho:chromic and/or phospho:chromic regeneration cell - converts trivalent chromium to hexavalent state with controlled chromium migration |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7617894A FR2354399A1 (en) | 1976-06-11 | 1976-06-11 | Sulpho:chromic and/or phospho:chromic regeneration cell - converts trivalent chromium to hexavalent state with controlled chromium migration |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2354399A1 true FR2354399A1 (en) | 1978-01-06 |
FR2354399B1 FR2354399B1 (en) | 1979-07-13 |
Family
ID=9174309
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7617894A Granted FR2354399A1 (en) | 1976-06-11 | 1976-06-11 | Sulpho:chromic and/or phospho:chromic regeneration cell - converts trivalent chromium to hexavalent state with controlled chromium migration |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2354399A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0008410A1 (en) * | 1978-08-11 | 1980-03-05 | Mitsubishi Jukogyo Kabushiki Kaisha | Process for treating chromic acid-containing wastewater |
EP0436146A1 (en) * | 1989-12-12 | 1991-07-10 | Hoechst Aktiengesellschaft | Process for the electrochemical regeneration of chromosulphuric acid |
-
1976
- 1976-06-11 FR FR7617894A patent/FR2354399A1/en active Granted
Non-Patent Citations (2)
Title |
---|
JA 74 86 227 YUASA , RESUMEE PAR *REVUE US "CHEMICAL ABSTRACTS", 82, NO. 8, 24-2-1975, NO. 49294G * |
JA 74 90 638 YUASA , RESUMEE PAR *REVUE US "CHEMICAL ABSTRACTS VOLUME 82, NO. 18, 5-5-1975, NO. 11787O) * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0008410A1 (en) * | 1978-08-11 | 1980-03-05 | Mitsubishi Jukogyo Kabushiki Kaisha | Process for treating chromic acid-containing wastewater |
EP0436146A1 (en) * | 1989-12-12 | 1991-07-10 | Hoechst Aktiengesellschaft | Process for the electrochemical regeneration of chromosulphuric acid |
Also Published As
Publication number | Publication date |
---|---|
FR2354399B1 (en) | 1979-07-13 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
ES478640A1 (en) | Process for the anodic oxydation of aluminium and its use as printing plate carrier material. | |
US4073708A (en) | Apparatus and method for regeneration of chromosulfuric acid etchants | |
GB1521199A (en) | Electroplating material with metal from aprotic waterfree electrolytes in the absence of free oxygen | |
JPS5751289A (en) | Electrolytic treating device for belt-like metallic plate | |
ES8609513A1 (en) | Cathode for metal electrowinning. | |
CA2110024A1 (en) | Non-Aqueous Electrolyte Cell | |
FR2354399A1 (en) | Sulpho:chromic and/or phospho:chromic regeneration cell - converts trivalent chromium to hexavalent state with controlled chromium migration | |
ZA74135B (en) | Metal anodes with reduced anodic surface and high current density and their use in electrowinning process with low cathodic current density | |
Hoare | A voltammetric study of the reduction of chromic acid on bright platinum | |
SE7501837L (en) | ||
ES427249A1 (en) | Electrolytic post-treating method of electrolytically chromate treated or metallic chromium plated steel sheet | |
Malinin et al. | Hydrogen Absorption of Steel During Chrome Plating From a Low Chromium Electrolyte | |
EP0170632A3 (en) | Process for the cathodic electrowinning of metals, with the corresponding acid generation, from their salt solutions | |
JPS579895A (en) | Method of forming selective absorption membrane for solar heat energy on surface of aluminum material | |
Appelt et al. | Electrodeposition of zinc from alkaline solutions, using a three-component impulse current | |
Whiteley Jr et al. | Electrolytic Oxidation of Excess Cr exp 3+ From Black Chromium Plating Baths | |
Bushrod et al. | The anodic behaviour of zinc in KOH solution. V: Galvanostatic polarization with an interruption | |
Terakado et al. | A New Alternative to the Hull Cell | |
Kirch | Simultaneous Removal of Heavy Metals and Oxidizable Noxious Compounds From Waste Water | |
Safonov | Oxidation of Thin-Film Iron Electrodes in Alkaline Solutions | |
Linnhoff | Use of Electrodialysis Technology for the Recovery of Plating Electrolytes | |
GB1377079A (en) | Electrolytic treatment of chromium-containing alloys and electrolytes for use therein | |
GB1388693A (en) | Direct chromium plating | |
Malinin et al. | The Corrosion and Electrochemical Behavior of Chromium Coatings Deposited From Electrolytes With Low Concentration of CrO sub 3 | |
GB912609A (en) | Improvements in and relating to the electroplating of aluminium and alloys thereof |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |