DE3300650A1 - Electropolishing process, in particular for electrolytically brightening metal workpieces - Google Patents

Electropolishing process, in particular for electrolytically brightening metal workpieces

Info

Publication number
DE3300650A1
DE3300650A1 DE19833300650 DE3300650A DE3300650A1 DE 3300650 A1 DE3300650 A1 DE 3300650A1 DE 19833300650 DE19833300650 DE 19833300650 DE 3300650 A DE3300650 A DE 3300650A DE 3300650 A1 DE3300650 A1 DE 3300650A1
Authority
DE
Germany
Prior art keywords
brightening
electrolyte solution
polyphosphates
acid
workpieces
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
DE19833300650
Other languages
German (de)
Other versions
DE3300650C2 (en
Inventor
Reinhard Slogsnat
Frank Sauerborn
Christa Ing Grad Isenberg
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.)
JULIUS & AUGUST ERBSLOEH GMBH + CO, 5620 VELBERT,
Original Assignee
Erbsloeh Julius & August
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 Erbsloeh Julius & August filed Critical Erbsloeh Julius & August
Priority to DE19833300650 priority Critical patent/DE3300650C2/de
Publication of DE3300650A1 publication Critical patent/DE3300650A1/en
Application granted granted Critical
Publication of DE3300650C2 publication Critical patent/DE3300650C2/de
Expired legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25FPROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F7/00Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects; Servicing or operating
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25FPROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F3/00Electrolytic etching or polishing
    • C25F3/16Polishing
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25FPROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F3/00Electrolytic etching or polishing
    • C25F3/16Polishing
    • C25F3/18Polishing of light metals
    • C25F3/20Polishing of light metals of aluminium

Abstract

The invention relates to an electropolishing process and apparatus, in particular for electrolytically brightening workpieces made of aluminium, aluminium alloys or other metals in an electrolyte solution whose basic electrolyte is composed of phosphoric acid or mixtures of phosphoric acid with other mineral acids, such as sulphuric acid, nitric acid or the like, and polyphosphates. The automation of such a brightening plant presents the problem that the relatively long crane lift-over times result in etching phenomena on the workpieces. The invention solves this problem by increasing the dynamic viscosity of the electrolyte solution (3) in the aluminium brightening baths (1) to at least 20 . 10<-3> Ns/m<2>, which is achieved by increasing the polyphosphate content in the electrolyte solution. During lift-over, the electrolyte consequently forms an enveloping, adhesive protective film on the workpieces. To keep the process conditions constant over a long period, the invention provides for the polyphosphates to be formed in the process by controlling the total acid concentration, the operating temperature and the current loading, with the addition of polyphosphates or other additives being avoided. To keep the process conditions constant, if a limiting viscosity value is exceeded, some of the electrolyte solution is pumped into a regeneration reservoir (5), freed of sludge therein, regenerated with fresh acid and fed back to the brightening bath (1). <IMAGE>
DE19833300650 1983-01-11 1983-01-11 Expired DE3300650C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19833300650 DE3300650C2 (en) 1983-01-11 1983-01-11

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19833300650 DE3300650C2 (en) 1983-01-11 1983-01-11

Publications (2)

Publication Number Publication Date
DE3300650A1 true DE3300650A1 (en) 1984-07-12
DE3300650C2 DE3300650C2 (en) 1986-01-30

Family

ID=6188027

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19833300650 Expired DE3300650C2 (en) 1983-01-11 1983-01-11

Country Status (1)

Country Link
DE (1) DE3300650C2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202006017090U1 (en) 2006-11-07 2008-03-20 BEGO Bremer Goldschlägerei Wilh. Herbst GmbH & Co. KG Heated electropolishing device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB645453A (en) * 1947-11-14 1950-11-01 Battelle Development Corp Electrolyte for and method of anodically polishing aluminium

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB645453A (en) * 1947-11-14 1950-11-01 Battelle Development Corp Electrolyte for and method of anodically polishing aluminium

Also Published As

Publication number Publication date
DE3300650C2 (en) 1986-01-30

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Legal Events

Date Code Title Description
OP8 Request for examination as to paragraph 44 patent law
8127 New person/name/address of the applicant

Owner name: JULIUS & AUGUST ERBSLOEH GMBH + CO, 5620 VELBERT,

D2 Grant after examination
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee