EP1029117B1 - Verfahren zum entschichten von körpern - Google Patents
Verfahren zum entschichten von körpern Download PDFInfo
- Publication number
- EP1029117B1 EP1029117B1 EP98951155A EP98951155A EP1029117B1 EP 1029117 B1 EP1029117 B1 EP 1029117B1 EP 98951155 A EP98951155 A EP 98951155A EP 98951155 A EP98951155 A EP 98951155A EP 1029117 B1 EP1029117 B1 EP 1029117B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- process according
- acid
- solution
- layer
- hydrogen peroxide
- 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 - Lifetime
Links
Classifications
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/19—Iron or steel
Definitions
- DD 228 977 describes a process for stripping TiN layers, in particular for stripping on nickel substrates applied TiN layers. Thereby, the ones to be treated Parts for approx. 3 minutes at a temperature of approx. 70 ° C up to 80 ° C in a hydrogen peroxide solution with a content of 35 Ma% peroxide introduced, then rinsed in water, dried and then mulled. For stripping TiAlN layers this method is unsuitable because the Badly dissolves TiAlN in a hydrogen peroxide solution.
- a process for the stripping of hard material layers various metal substrates is known from US 4,746,369.
- the acidic decoating bath consists of hydrogen peroxide as an oxidizer and a phosphoric acid or nitric acid together.
- the very low pH of the solution of less than 0.5 is for use on high speed steel substrates - HSS (High Speed Steel) - very disadvantageous.
- DE 41 01 843 describes a process for the stripping of Hard material coated objects are known, wherein the objects with a solution containing tetra sodium diphosphate and hydrogen peroxide.
- Typical are the hydrogen peroxide concentrations from 8 to 12% that relatively high tetra sodium diphosphate concentration from 8 to 12%, the high process temperature, at boiling temperature, and the high pH from 8 to 12.
- the solution is about half of the initial volume evaporated - what at the high temperatures takes place relatively quickly - phosphating can already occur stripped surface occur. Titanium nitride and / or titanium nitride / carbide hard material layers.
- DE 43 39 502 describes processes specific to layer material for stripping metal substrates, especially of Tungsten carbide substrates, known which hard material layers either from TiN, from TiCN or from TiAlN, or else from Layer systems made of TiN / TiAlN.
- the solution bath settles, depending on the layer to be removed and while protecting the substrates, layer-specific a variety of components together.
- High-speed steel is characterized by high carbon concentrations, up to 1.5%, and additions of strong carbide-forming elements such as chrome, molybdenum and tungsten Vanadium. Up to 12% cobalt is in some of the more complex ones Varieties included.
- High-speed steel is so called because of its high hardness in high speed applications (see D.T. Llewellyn, Steel: Metallurgy and Application, Butterworth-Heihemann Ltd., Oxford 1992, p. 174).
- a salt of a phosphoric acid, diphosphoric acid, Triphosphoric acid etc. is the phosphate "Calcium phosphate” a salt of phosphoric acid, “disodium dihydrogen phosphate” a salt of diphosphoric acid, further "penta-sodium triphosphate” a salt of triphosphoric acid Etc.
- Phosphonate is a salt of a phosphonic acid, in particular an organic phosphonic acid, i.e. one Phosphonic acid with organic substituents understood.
- the above-mentioned task is solved in that for the stripping of HSS substrates from a layer of TiAlN, at least a substance from the group of phosphates, phosphonates and phosphonic acids is used.
- TiAlN dissolves in hydrogen peroxide solutions not even at elevated temperatures. Will the pH of the hydrogen peroxide solution by metering one Base, as raised by NaOH, to the alkaline range with pH ⁇ 7, then - according to the invention - in addition to those mentioned TiN and TiCN layers also dissolved TiAlN layers. It it was recognized that this is also the case at low process temperatures the case is.
- alkaline hydrogen peroxide is the high process reliability with regard to corrosion of HSS material.
- alkaline HSS behaves very noble in the media. So there is also then there is no risk of corrosion for the HSS substrate if longer Stripping times would have to be used.
- the bath life is relative low, is usually between 1 and 3 batches what Of course, in certain cases it is quite sufficient.
- This relatively short bath life is due to the limited Stability of polyphosphates.
- the stability of polyphosphates is only moderate in alkaline solutions, in acidic solutions bad.
- the polyphosphates are converted into orthophosphates by hydrolysis transferred for the stabilization of the peroxide solutions are far less effective.
- the bath was heated to 60 ° C and 500 pieces of 12 mm HSS end mills, coated with a TiAlN layer in the solution brought in.
- the tools were complete after 3 hours decoated and the bath temperature was stable at 60 ⁇ 2 ° C remained.
- the temperature of the stripping solution was controlled by heating / cooling kept constant at about 60 ° C, and 500 Piece of 12mm HSS end mill, coated with a TiAlN layer, introduced into the solution. After three hours they were Tools completely stripped and the bath temperature was remained stable at 60 ⁇ 2 ° C. Several of the mentioned could Batches can be stripped in the same solution.
- the advantage of the present invention is that it remains simple Solution composition, the simple process management and the short stripping time. At solution temperatures well below the boiling point can already be within can be stripped within a few hours. Regarding corrosion HSS substrates have a high level of security: Because the stripping solution alkaline, there is no corrosion of HSS instead of.
- HSS substrates e.g. mixed with TiN, TiCN and / or TiAlN layers
- a large number HSS substrates e.g. mixed with TiN, TiCN and / or TiAlN layers
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- ing And Chemical Polishing (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Detergent Compositions (AREA)
Description
- Wasserstoffperoxid
- mindestens eine Base
- mindestens eine Säure und/oder ein Salz einer Säure.
- Als Phosphat wird di-Natriumdihydrogenpyrophosphat, Na2H2P2O7 und/oder penta-Natriumtriphosphat (Na5P3O10) bevorzugt eingesetzt;
- Als Phosphon-Säure wird bevorzugterweise Aminotri(methylenphosphonsäure) und/oder 1-Hydroxyethan (1,1-diphosphonsäure) eingesetzt. Dabei werden diese Phosphonsäuren als solche direkt in die Lösung eingebracht. Dies gilt generell für den Einsatz von Phosphonaten, Phosphaten und Phosphonsäuren. Dabei hat es sich mindestens vorläufig gezeigt, dass der Einsatz der 1-Hydroxyethan(1,1-diphosphonsäure) besonders geeigneter ist.
- Die Prozesstemperatur des Lösungsbades wird, gegebenenfalls durch Heizen und/oder Kühlen, auf 20°C bis 80°C gehalten (die Bereichsgrenzen sind eingeschlossen);
- Die Peroxidkonzentration wird zwischen 5 und 50 Gew.% gewählt (die Bereichsgrenzen sind eingeschlossen);
- Die Konzentration von Phosphat und/oder Phosphonat und/oder Phosphon-Säure wird zwischen 0,1 und 10 Gew.% gewählt (die Bereichsgrenzen sind eingeschlossen);
- Es können auch grössere Lösungsbadvolumina, z.B. ≥ 50 l oder gar ≥ 100 1, stabil betrieben werden;
- Die Lösung besteht vorzugsweise aus destilliertem Wasser, Wasserstoffperoxid, der erwähnten Base, beispielsweise NaOH, und den erwähnten Phosphaten und/oder Phosphonaten und/oder Phosphon-Säuren, mindestens in weitaus überwiegendem Anteil.
- 125 l Wasserstoffperoxid, 17,5 Gew.%
- 1,25 kg Na5P3O10
- 500 g NaOH
- 125 l Wasserstoffperoxid, 17,5 Gew.%
- 0,2 mol/l Aminotri-(methylenphosphonsäure)ATMP
- 0,4 mol/l NaOH
- 125 l Wasserstoffperoxid, 17,5 Gew.%
- 2 Gew.% 1-Hydroxyethan(1,1-diphosphonsäure)HEDP
- 0,4 mol/l NaOH
Claims (12)
- Verfahren zum Entschichten von Körpern, versehen mit einer Hartstoffschicht aus einer Ti-Verbindung, in einer alkalischen Lösung, enthaltendWasserstoffperoxidmindestens eine Basemindestens eine Säure und/oder ein Salz einer Säure,
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass Phosphonat als solches in die Lösung eingebracht wird und/oder durch Einbringen einer organischen Phosphonsäure.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass, als Phosphon-Säure, Aminotri-(methylenphosphonsäure) und/oder, dabei bevorzugt, 1-Hydroxyethan(1,1-diphosphonsäure) eingesetzt wird.
- Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass als Phosphat di-Natriumdihydrogenpyrophosphat und/oder Na2H2P2O7 und/oder penta-Natriumtriphosphat (Na5P3O10) eingesetzt wird.
- Verfahren nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass die Lösungstemperatur zwischen 20°C und 80°C, beide Grenzen eingeschlossen, gehalten wird.
- Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Wasserstoffperoxid-Konzentration zwischen 5 und 50 Gew.% gewählt wird, beide Grenzen eingeschlossen.
- Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Konzentration von Phosphat und/oder Phosphonat und/oder Phonsphon-Säure zu zwischen 0,1 und 10 Gew.% gehalten wird, beide Grenzen eingeschlossen.
- Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass ein Lösungsvolumen von mindestens 50 l, vorzugsweise von mindestens 100 1, eingesetzt wird.
- Verfahren zum Entschichten nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass gleichzeitig nebst mindestens einer TiAlN-Schicht eine TiN- und/oder TiCN-Schicht entschichtet wird.
- Verfahren nach einem der Ansprüche 1 bis 9,wobei die Körper Werkzeuge sind.
- Verfahren nach Anspruch 10, wobei die Werkzeuge spanende oder formende Werkzeuge sind.
- Verfahren nach Anspruch 11, wobei die Werkzeuge Fräser, Wendeschneidplatten oder Prägwerkzeugen sind.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH258897 | 1997-11-10 | ||
CH258897 | 1997-11-10 | ||
CH140398 | 1998-07-01 | ||
CH140398 | 1998-07-01 | ||
PCT/CH1998/000479 WO1999024642A1 (de) | 1997-11-10 | 1998-11-09 | Verfahren zum entschichten von körpern |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1029117A1 EP1029117A1 (de) | 2000-08-23 |
EP1029117B1 true EP1029117B1 (de) | 2004-08-25 |
Family
ID=25687544
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98951155A Expired - Lifetime EP1029117B1 (de) | 1997-11-10 | 1998-11-09 | Verfahren zum entschichten von körpern |
Country Status (6)
Country | Link |
---|---|
US (1) | US6432219B1 (de) |
EP (1) | EP1029117B1 (de) |
JP (2) | JP4326144B2 (de) |
DE (1) | DE59811875D1 (de) |
ES (1) | ES2226178T3 (de) |
WO (1) | WO1999024642A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9212555B2 (en) | 2005-10-14 | 2015-12-15 | Mtu Aero Engines Gmbh | Method for removing the coating from a gas turbine component |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999064646A1 (de) * | 1998-06-11 | 1999-12-16 | Unaxis Trading Ag | Verfahren zum entschichten von hartstoffschichten |
JP3909035B2 (ja) * | 2003-04-09 | 2007-04-25 | 三井金属鉱業株式会社 | メッキ前処理液およびメッキ前処理方法 |
ATE453739T1 (de) * | 2004-01-29 | 2010-01-15 | Oerlikon Trading Ag | Entschichtungsverfahren |
CH705281B1 (de) * | 2004-01-29 | 2013-01-31 | Oerlikon Trading Ag | Entschichtungsverfahren. |
US7077918B2 (en) | 2004-01-29 | 2006-07-18 | Unaxis Balzers Ltd. | Stripping apparatus and method for removal of coatings on metal surfaces |
US20070023943A1 (en) * | 2005-07-28 | 2007-02-01 | Forenz Dominick J | Stripping titanium-based wear coatings |
CN102016122A (zh) | 2008-05-02 | 2011-04-13 | 欧瑞康贸易股份公司(特吕巴赫) | 从工件上脱层的方法及脱层溶液 |
US9096555B2 (en) | 2009-01-12 | 2015-08-04 | Aerpio Therapeutics, Inc. | Methods for treating vascular leak syndrome |
JP5923033B2 (ja) * | 2012-12-25 | 2016-05-24 | 三和油化工業株式会社 | クロム系硬質皮膜用剥離液 |
EP3119928B1 (de) * | 2014-03-18 | 2018-08-22 | Platit AG | Verfahren zum entschichten von keramischen hartstoffschichten von stahl- und hartmetall-substraten |
JP6528092B2 (ja) * | 2015-08-31 | 2019-06-12 | 日本表面化学株式会社 | 皮膜除去剤及び皮膜除去方法 |
US10570501B2 (en) | 2017-05-31 | 2020-02-25 | Kennametal Inc. | Multilayer nitride hard coatings |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3854996A (en) | 1972-04-27 | 1974-12-17 | Halliburton Co | Method for removing magnetite scale |
CA1209886A (en) * | 1982-01-11 | 1986-08-19 | Thomas W. Bleeks | Peroxide selective stripping compositions and method |
US4666528A (en) * | 1985-11-27 | 1987-05-19 | Halliburton Company | Method of removing iron and copper-containing scale from a metal surface |
WO1992007110A1 (en) | 1990-10-19 | 1992-04-30 | Union Carbide Coatings Service Technology Corporation | Stripping solution and process for stripping compounds of titanium from base metals |
DE4101843C1 (en) * | 1991-01-23 | 1992-04-02 | Eifeler Werkzeuge Gmbh, 4000 Duesseldorf, De | Hard tool coating for economy - by stripping using tetra:sodium di:phosphate soln. and hydrogen peroxide |
DE4110595C1 (en) * | 1991-04-02 | 1992-11-26 | Thyssen Edelstahlwerke Ag, 4000 Duesseldorf, De | Wet-chemical removal of hard coatings from workpiece surfaces - comprises using hydrogen peroxide soln. stabilised by complex former e.g. potassium-sodium tartrate-tetra:hydrate |
JP2597931B2 (ja) * | 1991-08-19 | 1997-04-09 | 株式会社不二越 | 高速度工具鋼のチタンコーティング被膜の除去剤 |
DE4339502C2 (de) | 1993-11-24 | 1999-02-25 | Thoene Carl Stefan | Entschichtungslösung zum naßchemischen Entfernen von Hartstoffschichten und Verfahren zu deren Anwendung |
JPH08188886A (ja) * | 1995-01-09 | 1996-07-23 | Sumitomo Metal Mining Co Ltd | 表面被覆膜の剥離方法 |
JP3320965B2 (ja) * | 1995-03-29 | 2002-09-03 | エムエムシーコベルコツール株式会社 | 硬質膜の剥離方法および該方法によって得られる再被覆部材 |
US6039891A (en) | 1996-09-24 | 2000-03-21 | Cabot Corporation | Multi-oxidizer precursor for chemical mechanical polishing |
US5847463A (en) * | 1997-08-22 | 1998-12-08 | Micron Technology, Inc. | Local interconnect comprising titanium nitride barrier layer |
-
1998
- 1998-11-09 JP JP2000519631A patent/JP4326144B2/ja not_active Expired - Fee Related
- 1998-11-09 ES ES98951155T patent/ES2226178T3/es not_active Expired - Lifetime
- 1998-11-09 DE DE59811875T patent/DE59811875D1/de not_active Expired - Lifetime
- 1998-11-09 EP EP98951155A patent/EP1029117B1/de not_active Expired - Lifetime
- 1998-11-09 WO PCT/CH1998/000479 patent/WO1999024642A1/de active IP Right Grant
- 1998-11-09 US US09/530,460 patent/US6432219B1/en not_active Expired - Lifetime
-
2009
- 2009-04-28 JP JP2009109435A patent/JP5295853B2/ja not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9212555B2 (en) | 2005-10-14 | 2015-12-15 | Mtu Aero Engines Gmbh | Method for removing the coating from a gas turbine component |
DE102005049249B4 (de) | 2005-10-14 | 2018-03-29 | MTU Aero Engines AG | Verfahren zur Entschichtung eines Gasturbinenbauteils |
Also Published As
Publication number | Publication date |
---|---|
JP5295853B2 (ja) | 2013-09-18 |
WO1999024642A1 (de) | 1999-05-20 |
JP2009167534A (ja) | 2009-07-30 |
EP1029117A1 (de) | 2000-08-23 |
JP4326144B2 (ja) | 2009-09-02 |
ES2226178T3 (es) | 2005-03-16 |
DE59811875D1 (de) | 2004-09-30 |
JP2001522943A (ja) | 2001-11-20 |
US6432219B1 (en) | 2002-08-13 |
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