EP0249650B1 - Electrolyte pour le polissage électrochimique de surfaces de métaux - Google Patents

Electrolyte pour le polissage électrochimique de surfaces de métaux Download PDF

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Publication number
EP0249650B1
EP0249650B1 EP86108474A EP86108474A EP0249650B1 EP 0249650 B1 EP0249650 B1 EP 0249650B1 EP 86108474 A EP86108474 A EP 86108474A EP 86108474 A EP86108474 A EP 86108474A EP 0249650 B1 EP0249650 B1 EP 0249650B1
Authority
EP
European Patent Office
Prior art keywords
electrolyte
acid
electrolyte according
aluminum
stabilizer
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
Application number
EP86108474A
Other languages
German (de)
English (en)
Other versions
EP0249650A1 (fr
Inventor
Friedrich Ruhstorfer
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.)
Poligrat-Holding Te Muenchen Bon GmbH
Original Assignee
Poligrat GmbH
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 Poligrat GmbH filed Critical Poligrat GmbH
Priority to DE8686108474T priority Critical patent/DE3667505D1/de
Priority to AT86108474T priority patent/ATE48661T1/de
Priority to EP86108474A priority patent/EP0249650B1/fr
Priority to US07/064,095 priority patent/US4740280A/en
Priority to JP62151525A priority patent/JPS634100A/ja
Publication of EP0249650A1 publication Critical patent/EP0249650A1/fr
Application granted granted Critical
Publication of EP0249650B1 publication Critical patent/EP0249650B1/fr
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F3/00—Electrolytic etching or polishing
    • C25F3/16—Polishing
    • C25F3/18—Polishing of light metals
    • C25F3/20—Polishing of light metals of aluminium
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F3/00—Electrolytic etching or polishing
    • C25F3/16—Polishing
    • C25F3/22—Polishing of heavy metals
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F3/00—Electrolytic etching or polishing
    • C25F3/16—Polishing
    • C25F3/22—Polishing of heavy metals
    • C25F3/24—Polishing of heavy metals of iron or steel

Definitions

  • the electrochemical polishing or glossing of metal surfaces is widely used in technology to treat smaller or larger objects made of steel, stainless steel, nickel alloys as well as aluminum and aluminum alloys on the surface.
  • the electrolytes used here usually contain phosphoric and sulfuric acid and optionally chromic acid, the workpieces being switched anodically.
  • the objects to be polished which hang on corresponding support elements or are arranged in baskets or the like, are placed in the electrolyte, i.e. the polishing bath, sunk and lifted out of it after a certain polishing time. After the bath liquid has drained off the polished surfaces, the objects are then immersed in rinsing baths in order to remove the electrolyte.
  • Electrolytes containing sulfuric acid / phosphoric acid and optionally chromic acid are used for the electrochemical polishing of steel, in particular stainless steel, and nickel alloys.
  • the gloss that can be achieved by electrochemical polishing largely depends on the degree of leveling, which is improved with increasing polishing time.
  • satisfactory results are generally achieved at a current density of approximately 25 A / dm 2 in 7 minutes or of approximately 10 A / dm 2 in approximately 20 minutes.
  • DD-A 205 198 describes an electrolyte for the electrochemical polishing of metal products which is essentially anhydrous and consists of a mixture of sulfuric acid and ethylene glycol with the addition of 1 to 10% organic phosphonic acids.
  • the object of the invention is to provide a chromic acid-free electrolyte for electrochemical deburring and polishing, i.e. for the electrolytic or electrochemical removal of metal unevenness from the surface of moldings made of aluminum and aluminum alloys on the one hand and steel, stainless steel and nickel alloys on the other hand, which in aluminum and aluminum alloys Protection against the subsequent etching and matting of the treated surfaces before rinsing off the electrolyte from the freshly polished surface and gives high shine to steel, stainless steel and nickel alloys.
  • this object is now achieved in that chelating agents based on phosphonic acids, preferably in an amount of 1 to 100 g / l, are added to a chromic acid-free electrolyte which contains sulfuric and phosphoric acid but does not contain ethylene glycol.
  • 20 to 30 g / l is preferred for the aluminum electrolyte and 10 to 20 g / l of phosphonic acid, based on the acid electrolyte, is preferred for the electrolyte for workpieces made of steel or nickel alloys.
  • Morpholinomethane diphosphonic acid of the general formula proved to be a particularly advantageous phosphonic acid for the purpose according to the invention: But 1-hydroxyethane-1,1-diphosphonic acid, aminotrismethylenephosphonic acid, diethylenetriamine-pentamethylenephosphonic acid and hydroxymethyldiphosphonic acid are also very suitable.
  • polishing of aluminum and aluminum alloys is carried out with a current density of 5 to 15 A / dm 2 , preferably 8 to 10 A / dm 2 , a polishing time of 15 to 20 minutes and an electrolyte temperature of about 80 ° C.
  • the current density should be 10 to 15 A / dm2, preferably about 15 A / dm 2 , at about 50 ° C and for nickel alloys 5 to 30 A / dm 2 at temperatures of the same order of magnitude, with a polishing time of approx . 15 minutes.
  • the inherently good resistance of phosphonic acids to acidic electrolytes can be improved by the addition of stabilizers in difficult working conditions, such as a very high working temperature and thus increased aggressiveness of the electrolyte.
  • stabilizers are nitrilotriacetic acid, in particular its sodium salt, in a concentration of 0.5 to 2% by weight, in particular about 1% by weight, and sodium glucoheptonate in a concentration of 0.5 to 2% by weight, in particular about 1 wt .-%, particularly proven.
  • the etching begins after 3 s.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • ing And Chemical Polishing (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Claims (6)

1. Electrolyte exempt d'acide chromique pour le polissage électrochimique d'objets en acier, acier spécial, alliages de nickel, aluminium et alliages d'aluminium, contenant de l'acide phosphorique et de l'acide sulfurique et sous réserve qu'il ne contient pas de glycol d'éthylène, caractérisé par un appoint d'un agent chélatant.
2. Electrolyte selon la revendication 1, caractérisé en ce que le bain contient 1 à 100 g/I d'agent chéla- tent.
3. Electrolyte selon l'une des revendications 1 ou 2, car. en ce que l'agent chélatant est l'acide mor- pholinométhane diphosphonique.
4. Electrolyte selon les revendications 1 à 3 car. en ce qu'il contient en outre un stabilisant pour l'acide phosphonique.
5. Electrolyte selon la revendication 4, car. en ce qu'il contient 0,5 à 2 pourcent en poids de stabilisant.
6. Electrolyte selon l'une des revendications 4 ou 5, car. en ce que le stabilisant est représenté par l'acide nitrilotriacétique ou un de ses sels ou par le glucoheptonate de sodium.
EP86108474A 1986-06-20 1986-06-20 Electrolyte pour le polissage électrochimique de surfaces de métaux Expired EP0249650B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE8686108474T DE3667505D1 (de) 1986-06-20 1986-06-20 Elektrolyt zum elektrochemischen polieren von metalloberflaechen.
AT86108474T ATE48661T1 (de) 1986-06-20 1986-06-20 Elektrolyt zum elektrochemischen polieren von metalloberflaechen.
EP86108474A EP0249650B1 (fr) 1986-06-20 1986-06-20 Electrolyte pour le polissage électrochimique de surfaces de métaux
US07/064,095 US4740280A (en) 1986-06-20 1987-06-18 Electrolyte for electrochemically polishing metal surfaces
JP62151525A JPS634100A (ja) 1986-06-20 1987-06-19 金属表面の電気化学的研磨用電解液

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP86108474A EP0249650B1 (fr) 1986-06-20 1986-06-20 Electrolyte pour le polissage électrochimique de surfaces de métaux

Publications (2)

Publication Number Publication Date
EP0249650A1 EP0249650A1 (fr) 1987-12-23
EP0249650B1 true EP0249650B1 (fr) 1989-12-13

Family

ID=8195209

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86108474A Expired EP0249650B1 (fr) 1986-06-20 1986-06-20 Electrolyte pour le polissage électrochimique de surfaces de métaux

Country Status (5)

Country Link
US (1) US4740280A (fr)
EP (1) EP0249650B1 (fr)
JP (1) JPS634100A (fr)
AT (1) ATE48661T1 (fr)
DE (1) DE3667505D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10151180A1 (de) * 2001-10-17 2003-04-30 Norbert Nowack Verfahren zur Entmetallisierung von metallischen Gegenständen
WO2016030506A1 (fr) 2014-08-29 2016-03-03 Poligrat Gmbh Électrolyte permettant de polir des aciers inoxydables, contenant un acide pyridine-carboxylique

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4937665A (en) * 1989-06-29 1990-06-26 Autovision Associates Apparatus for promoting the vigilance of a vehicle operator using monocular display
SE9101469D0 (sv) * 1991-05-15 1991-05-15 Sandvik Ab Etsmetod
DE19514272C2 (de) * 1995-04-21 1997-02-20 Amtra Aquaristik Gmbh Mittel und Verfahren zur Regulierung der Härte und des pH-Wertes des Wassers von Süßwasseraquarien
SE511777C2 (sv) * 1998-02-02 1999-11-22 Avesta Sheffield Ab Metod för behandling av en metallprodukt
KR20030003838A (ko) * 2001-07-04 2003-01-14 이은상 공기동압 베어링의 미세홈 가공 및 표면연마용 전기화학복합 가공방법
ATE395092T1 (de) * 2003-07-08 2008-05-15 Poligrat Gmbh Zementierbare endoprothesen
DE102005037563B3 (de) * 2005-08-09 2006-09-28 Poligrat Gmbh Elektropolierverfahren
CN1908248B (zh) * 2006-07-26 2012-09-05 沈阳工业大学 不锈钢印刷电路板精密抛光工艺
DE102007011632B3 (de) * 2007-03-09 2008-06-26 Poligrat Gmbh Elektropolierverfahren für Titan
ES2399477T3 (es) * 2007-12-13 2013-04-01 Akzo Nobel N.V. Disoluciones de peróxido de hidrógeno estabilizadas
US20100215926A1 (en) 2009-02-25 2010-08-26 Askin Albert L Aluminum alloy substrates having a multi-color effect and methods for producing the same
JP5917909B2 (ja) * 2011-12-27 2016-05-18 株式会社中野科学 アルミニウム部材の電解研磨方法
CN103436947B (zh) * 2013-09-13 2016-01-20 上海化工研究院 涂层导体Ni-5at.％W合金基带的电化学抛光方法
EP2878713A1 (fr) * 2013-11-28 2015-06-03 Abbott Laboratories Vascular Enterprises Limited Composition électrolytique et procédé pour le traitement de polissage électrolytique d'alliages de nickel-titane et/ou d'autres substrats métalliques comprenant des alliages de tungstène, niobate et tantale
CN104532338A (zh) * 2014-12-11 2015-04-22 沈阳富创精密设备有限公司 哈氏合金电解抛光工艺
EP3109348B1 (fr) * 2015-06-24 2020-06-03 Airbus Defence and Space GmbH Électrolyte et procédé de polissage électrolytique d'un substrat métallique
WO2018191695A1 (fr) 2017-04-13 2018-10-18 Arconic Inc. Alliages d'aluminium contenant des éléments de fer et de terres rares
JP7177425B2 (ja) * 2017-12-28 2022-11-24 株式会社日本科学エンジニアリング ステンレス鋼用電解研磨液

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2820750A (en) * 1953-03-25 1958-01-21 Charlesworth Percy Allan Electrolytic treatment of metals and alloys
GB1070644A (en) * 1963-02-25 1967-06-01 Diversey U K Ltd Process for brightening aluminium and aluminium base alloys, and composition therefor
DD205198A1 (de) * 1982-05-12 1983-12-21 Hermann Matschiner Elektrolyt zum elektrochemischen polieren
DE3415363A1 (de) * 1984-04-25 1985-10-31 Hoechst Ag, 6230 Frankfurt Verfahren zur elektrochemischen aufrauhung von aluminium fuer druckplattentraeger in einem waessrigen mischelektrolyten

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10151180A1 (de) * 2001-10-17 2003-04-30 Norbert Nowack Verfahren zur Entmetallisierung von metallischen Gegenständen
DE10151180A8 (de) * 2001-10-17 2010-03-18 Nowack, Norbert, Prof. Dr.-Ing. Verfahren und Lösung zur Entschichtung von metallischen Gegenständen mit Nickel-Korrosionsschutzbeschichtung
DE10151180B4 (de) * 2001-10-17 2010-05-12 Nowack, Norbert, Prof. Dr.-Ing. Verfahren und Lösung zur Entschichtung von metallischen Gegenständen mit Nickel-Korrosionsschutzbeschichtung
WO2016030506A1 (fr) 2014-08-29 2016-03-03 Poligrat Gmbh Électrolyte permettant de polir des aciers inoxydables, contenant un acide pyridine-carboxylique

Also Published As

Publication number Publication date
ATE48661T1 (de) 1989-12-15
JPS634100A (ja) 1988-01-09
US4740280A (en) 1988-04-26
EP0249650A1 (fr) 1987-12-23
DE3667505D1 (de) 1990-01-18

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