EP0409785A1 - Electrolyte pour obtenir des couches de conversions noires sur des métaux légers - Google Patents
Electrolyte pour obtenir des couches de conversions noires sur des métaux légers Download PDFInfo
- Publication number
- EP0409785A1 EP0409785A1 EP90810539A EP90810539A EP0409785A1 EP 0409785 A1 EP0409785 A1 EP 0409785A1 EP 90810539 A EP90810539 A EP 90810539A EP 90810539 A EP90810539 A EP 90810539A EP 0409785 A1 EP0409785 A1 EP 0409785A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mol
- electrolyte
- layers
- conversion layers
- potassium
- 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.)
- Withdrawn
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
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/26—Anodisation of refractory metals or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/026—Anodisation with spark discharge
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12806—Refractory [Group IVB, VB, or VIB] metal-base component
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12806—Refractory [Group IVB, VB, or VIB] metal-base component
- Y10T428/12812—Diverse refractory group metal-base components: alternative to or next to each other
Definitions
- the invention relates to electrolytes for producing black, finely matted conversion layers as functional surfaces of assemblies made of lightweight materials, especially titanium materials, by the process of anodic oxidation with spark discharge (ANOF).
- ANOF anodic oxidation with spark discharge
- a number of electrolytes for producing conversion layers by means of anodic oxidation with spark discharge on lightweight materials, especially on valve metals such as Ti, Ta, Zr, Nb or Al, are known from the specialist and patent literature.
- DD-221 762 and DD-229 163 black or gray-black conversion layers on light metals such as Al are described which are achieved by the ANOF process.
- the disadvantage of these solutions is that they use electrolyte solutions which contain fluorides in particular as NaF or NH4F in addition to dihydrogen phosphates as NaH2PO4, tetraborates as Borax Na2B4O7 and chromates and other third-party additives.
- the possibility of incorporating non-metallic (carbides, oxides) and metallic components as dispersion layers using fluoride-containing ANOF electrolytes on titanium materials includes the disadvantage of the electrolyte containing fluoride, as well as the disadvantage of poor solubility the components in the electrolyte and all other disadvantages of dispersion layers, such as inhomogeneous structure and the like.
- the possibility of blackening is not described.
- DD-A-257 275 refers to decorative coatings, inter alia, on titanium materials which are produced by means of the ANOF process and an electrolyte consisting of NAF, NaH2PO4, Na2B4O7 and potassium hexacyanoferrate-K4 [FE [CN] 6].
- This solution harbors the great problems of health and environmental protection due to the toxic cyanide-containing electrolyte.
- the black color is achieved only through the use of hexacyanoferrate, which, similar to the black iron-aluminum spinel, forms a titanium spinel and only serves decorative purposes.
- valve metals such as Ti, Ta, Zr, Nb, Al, whose radiation physical size optical absorption ( ⁇ ) and thermal emission ( ⁇ ) are almost the same.
- DD-A-236 978 describes solar-selective absorption layers which consist of dark-colored, chromium-doped oxide layers on valve metals, such as Ti, Ta, Zr, Nb, Al, and which also contain an electrolyte containing fluoride, dihydrogen phosphate, tetraborate and chromate in the ANOF process be generated.
- valve metals such as Ti, Ta, Zr, Nb, Al
- these layers have a high absorption capacity of ⁇ > 0.92, they have such a rough surface structure effect that multiple reflections result, so that the incident radiation emits its energy in the form of heat to the absorber layer, which is then transferred to the collector body .
- a very low thermal emission ⁇ is achieved in relation to the optical absorption.
- the aim of the invention is to provide an inexpensive, low-pollutant electrolyte for producing simply constructed, optically black, finely matted conversion layers on light metals or their alloys, especially titanium, with high long-term stability and which are characterized by universal applicability.
- the invention has for its object to develop a fluoride and cyanide-free electrolyte that enables the production of optically black layers with almost the same optical absorption and thermal emissivity, combined with high stability and simultaneous thermal vacuum stability.
- Black conversion layers are formed on the electrolyte according to the invention
- Light metals or their alloys, preferably titanium, are obtained by means of anodic oxidation with spark discharge.
- the electrolyte preferably consists of a 2 to 6 volume percent ammoniacal aqueous solution of 0.3 to 0.6 mol / l potassium dihydrogen phosphate; 0.08 to 0.3 mol / l potassium chromate and acetate ions in concentrations of 0.08 to 1.0 mol / l, preferably 0.08 to 0.5 mol / l.
- An advantageous embodiment of the solution is that the acetate ions are added in the form of copper acetate.
- a lens housing made of titanium material degreased in technical acetone is made by means of plasma-chemical anodic oxidation in an aqueous electrolyte consisting of a 4.5 volume percent ammoniacal solution with 0.5 mol / l KH2PO4; 0.1 mol / l K2CrO4 and 0.35 mol / l [CH3 COO] 2Cu coated at a current density of 0.045A.cm ⁇ 2.
- the ⁇ / ⁇ ratio is 0.95.
- thermovacuum stability shows no changes in optically relevant areas.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Secondary Cells (AREA)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DD331004 | 1989-07-19 | ||
DD33100489A DD299596A7 (de) | 1989-07-19 | 1989-07-19 | Elektrolyt zur erzeugung schwarzer konversionsschichten auf leichtmetallen |
DD33100389A DD299595A7 (de) | 1989-07-19 | 1989-07-19 | Schwarze konversionsschichten auf titanwerkstoffen |
DD331003 | 1989-07-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0409785A1 true EP0409785A1 (fr) | 1991-01-23 |
Family
ID=25748286
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90810539A Withdrawn EP0409785A1 (fr) | 1989-07-19 | 1990-07-16 | Electrolyte pour obtenir des couches de conversions noires sur des métaux légers |
Country Status (3)
Country | Link |
---|---|
US (2) | US5035781A (fr) |
EP (1) | EP0409785A1 (fr) |
DE (1) | DE4017711A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITMI20082275A1 (it) * | 2008-12-19 | 2010-06-20 | Italfinish Spa | Procedimento elettrolitico per l'ottenimento di rivestimenti scuri o neri su materiali metallici non ferrosi |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4239391C2 (de) * | 1991-11-27 | 1996-11-21 | Electro Chem Eng Gmbh | Gegenstände aus Aluminium, Magnesium oder Titan mit einer mit Fluorpolymeren gefüllten Oxidkeramikschicht und Verfahren zu ihrer Herstellung |
DE4139006C3 (de) * | 1991-11-27 | 2003-07-10 | Electro Chem Eng Gmbh | Verfahren zur Erzeugung von Oxidkeramikschichten auf sperrschichtbildenden Metallen und auf diese Weise erzeugte Gegenstände aus Aluminium, Magnesium, Titan oder deren Legierungen mit einer Oxidkeramikschicht |
WO2004092436A2 (fr) * | 2003-04-16 | 2004-10-28 | Ahc Oberflächentechnik Gmbh & Co. Ohg | Objet |
EP1587348A1 (fr) * | 2004-03-30 | 2005-10-19 | Feng Chia University | Plaque de base conductrice |
TW201621096A (zh) * | 2014-12-05 | 2016-06-16 | 財團法人金屬工業研究發展中心 | 黑色含鈦氧化層及其製備方法、以及植入物 |
CN105177672B (zh) * | 2015-09-15 | 2017-10-03 | 哈尔滨工业大学 | 一种钛合金表面高太阳能吸收率高发射率黑色消光膜层的制备方法 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE236978C (fr) * | ||||
DD229163A1 (de) * | 1984-11-21 | 1985-10-30 | Karl Marx Stadt Tech Hochschul | Elektrolyte zur erzeugung eigenfarbiger schichten auf sperrschichtbildenden metallen |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2330170A (en) * | 1939-09-08 | 1943-09-21 | Crane Co | Electrolytic polishing of metal |
US3268306A (en) * | 1962-03-28 | 1966-08-23 | Trw Inc | Titanium pretreatment for protective coating of refractory alloys |
US3446606A (en) * | 1965-07-14 | 1969-05-27 | United Aircraft Corp | Refractory metal articles having oxidation-resistant coating |
US3453288A (en) * | 1965-10-15 | 1969-07-01 | Synvar Ass | Electron spin resonance labels for biomolecules |
SU742493A1 (ru) * | 1978-11-01 | 1980-06-25 | Харьковский Ордена Ленина Политехнический Институт Им.В.И.Ленина | Раствор дл электрохимического полировани металлов |
DE3102207A1 (de) * | 1980-01-29 | 1981-11-19 | Mitsubishi Denki K.K., Tokyo | Funkenerrosionsbearbeitungsloesung und deren anwendung |
US4305998A (en) * | 1980-02-04 | 1981-12-15 | The United States Of America As Represented By The Secretary Of The Navy | Protective coating |
US4448853A (en) * | 1981-04-15 | 1984-05-15 | Bbc Brown, Boveri & Company, Limited | Layered active brazing material and method for producing it |
JPS58143919A (ja) * | 1982-02-16 | 1983-08-26 | Fanuc Ltd | 放電加工方法 |
-
1990
- 1990-05-24 US US07/528,664 patent/US5035781A/en not_active Expired - Lifetime
- 1990-06-01 DE DE4017711A patent/DE4017711A1/de not_active Withdrawn
- 1990-07-16 EP EP90810539A patent/EP0409785A1/fr not_active Withdrawn
-
1991
- 1991-01-07 US US07/638,288 patent/US5075178A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE236978C (fr) * | ||||
DD229163A1 (de) * | 1984-11-21 | 1985-10-30 | Karl Marx Stadt Tech Hochschul | Elektrolyte zur erzeugung eigenfarbiger schichten auf sperrschichtbildenden metallen |
Non-Patent Citations (1)
Title |
---|
CRYSTAL RES. TECHN., Band 22, 1987, Seiten 53-58; P. KURZE et al.: "Coloured ANOF layers on aluminium" * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITMI20082275A1 (it) * | 2008-12-19 | 2010-06-20 | Italfinish Spa | Procedimento elettrolitico per l'ottenimento di rivestimenti scuri o neri su materiali metallici non ferrosi |
Also Published As
Publication number | Publication date |
---|---|
US5075178A (en) | 1991-12-24 |
DE4017711A1 (de) | 1991-01-31 |
US5035781A (en) | 1991-07-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): CH FR GB LI |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: JENOPTIK JENA G.M.B.H. |
|
17P | Request for examination filed |
Effective date: 19910622 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
18W | Application withdrawn |
Withdrawal date: 19930730 |