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 migration

Info

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
Application number
FR7617894A
Other languages
French (fr)
Other versions
FR2354399B1 (en
Inventor
Pierre Gross
Dominique Pison
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sarel Appareillage Electrique SAS
Original Assignee
Sarel Appareillage Electrique SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sarel Appareillage Electrique SAS filed Critical Sarel Appareillage Electrique SAS
Priority to FR7617894A priority Critical patent/FR2354399A1/en
Publication of FR2354399A1 publication Critical patent/FR2354399A1/en
Application granted granted Critical
Publication of FR2354399B1 publication Critical patent/FR2354399B1/fr
Granted legal-status Critical Current

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.
FR7617894A 1976-06-11 1976-06-11 Sulpho:chromic and/or phospho:chromic regeneration cell - converts trivalent chromium to hexavalent state with controlled chromium migration Granted FR2354399A1 (en)

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)

* Cited by examiner, † Cited by third party
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

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

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Legal Events

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