EP1022357A1 - Verfahren zur Oberflächenbehandlung von rostfreien Stählen - Google Patents
Verfahren zur Oberflächenbehandlung von rostfreien Stählen Download PDFInfo
- Publication number
- EP1022357A1 EP1022357A1 EP00101186A EP00101186A EP1022357A1 EP 1022357 A1 EP1022357 A1 EP 1022357A1 EP 00101186 A EP00101186 A EP 00101186A EP 00101186 A EP00101186 A EP 00101186A EP 1022357 A1 EP1022357 A1 EP 1022357A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- acid
- steel
- liquid bath
- temperature
- mineral
- 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
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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
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
-
- 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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F15/00—Other methods of preventing corrosion or incrustation
-
- 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
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/083—Iron or steel solutions containing H3PO4
Definitions
- the present invention is in the field of steels and Machining or treatment of steels, preferably for the production of Devices e.g. are intended for home use.
- the present invention such devices and parts or their treatment that the Exposed to heat.
- the present invention provides a method of treatment of steels, in particular of stainless steel, available for these applications are intended, the treatment of the invention Steels prevent their yellowing during everyday use.
- JP-A 52 64 045 This includes the 5-step process described in JP-A 52 64 045, where the surface of the steel is first sandblasted, then in an etchant such as HF, salt, saltpetre or Phosphoric acid immersed, then coated with a resin film and heated is so that the film adheres to the surface in cured form.
- the JP-A 61 06 693 describes another method which is a sandblast treatment of the steel to make its surface more corrosion resistant do. With this method, too, the steel is immersed into a mineral acid before applying a layer of resin.
- Another one Process for the treatment of stainless steel a so-called Chromating process is described in JP-A 52 145 346. Doing so The surface is film-coated by immersing the steel in a hot one aqueous solution containing sulfuric acid, oxidizing agents e.g. based on chrome (such as potassium dichromate) and phosphoric acid.
- the object of the present invention is accordingly to provide a simple method by means of which Stainless steel surface resistant to dirt and Discoloration (yellowing) can be made.
- This procedure includes treatment of the steel with mineral acids, preferably phosphoric acid, especially with aqueous phosphoric acid, the presence of one or several surfactants is preferred.
- mineral acids preferably phosphoric acid, especially with aqueous phosphoric acid
- phosphoric acid for the FINOX® DH ISO 9002 process according to the invention.
- concentration of the aqueous phosphoric acid is preferably included 50% (v / v) or less, concentrations in the range are particularly preferred of 25, 30, 35, 40 and 45% (v / v).
- This steel treatment process according to the invention should generally be carried out beforehand the use of steel in the manufacturing chain of equipment or parts respectively. In any case, this procedure achieves that later Discoloration (yellowing) of the steel can be prevented.
- the method according to the invention does not require a large expenditure on equipment and without sandblasting and coatings of any kind (e.g. with Resins and other polymers).
- the present invention thus relates to a method for Surface treatment of stainless steels, which is particularly suitable To prevent yellowing after the steel has been exposed to heat.
- the temperature in step (a) is preferably 250-500 ° C and especially preferably 300-400 ° C.
- the heated steel becomes immediate immersed in the liquid bath after step (a) (step (b)), i.e. without previous Cooling of the steel.
- step (a) steel cooled to room temperature or slightly above (30-55 ° C) after immersing it in a hot mineral, preferably phosphoric acid (Temperature greater than approx. 50 ° C, preferably greater than 80 ° C), resistant to Yellowing is or will be.
- a hot mineral preferably phosphoric acid (Temperature greater than approx. 50 ° C, preferably greater than 80 ° C)
- a particularly preferred phosphoric acid in step (b) is an aqueous one Phosphoric acid mixed with surfactants such as FINOX® DH ISO 9002.
- surfactants such as FINOX® DH ISO 9002.
- the use of a 33% (v / v) aqueous is particularly preferred Solution of FINOX® DH ISO 9002 (Chimiderouil Productos Tamosa, S.A.).
- FINOX® DH eliminates ISO 9002 by immersion, circulation, Sprinkling or other application of greasy contaminants from Surfaces. It also enables the deoxidation of numerous metals (i.e. the Removal of oxide layers or derusting) such as the carbon and Cast steels, stainless ferritic and martensitic steels, des Aluminum and copper and their two alloys.
- step (b) is preferably carried out over a period of 1-10 min, preferably 2-8 min, particularly preferably 3-6 min. Another a particularly preferred embodiment provides for a duration of about 5 minutes Step (b) above.
- step (b) Hydrochloric acid, nitric acid, sulfuric acid, chloric acid, Perchloric acid, bromic acid, perbromic acid, iodic acid, periodic acid, Silicic acid, tungstic acid, 12-tungstosilicic acid, 12-tungstophosphoric acid or a mixture of two or more of these or other mineral acids.
- steps (c) and (d) are to remove any rest of the liquid bath Remove step (b) completely. Otherwise there is the, albeit minor, Possibility of streaked or grained during finishing Form surfaces, making the end product less aesthetically acceptable would.
- the temperature of the air flow in step (d) is usually 50-150 ° C, in particular at 70-130 ° C or at 80-120 ° C, particularly preferably at 90-110 ° C or at 95-105 ° C, with a temperature of 100 ° C especially suitable is.
- This treatment prevents the user from using his device subject to mechanical or chemical abrasion to eliminate yellowed surfaces.
- the result of this is damage of the steel parts and the risk to the user when using them resulting from such aggressive chemical products can be avoided.
- the device comprises a zone 5 of the entry of water into a cooling and rinsing circuit (shown in Fig. 1 by a line " ⁇ - ⁇ - ⁇ -”), a zone of separation 7 between the water and the liquid bath which reprocesses the water from zone 6 for the cooling and rinsing cycle and the separated phosphoric acid 9 in the steam cycle (shown in Fig. 1 by a line "----") for recovery and reprocessing it is fed.
- This steam cycle also includes a zone for cooling 11 which is common to the cooling and rinsing circuit, and a zone 10 for collecting vapors, which allows the Phosphoric acid attributed to the treatment 2 bath.
- FIG. 1 In accordance with a preferred embodiment of FIG Invention to be treated stainless steel tarpaulins through the zone 8 inserted in the furnace 1, where they are heated to 300-400 ° C before be led into bath 2 for a period of 4.5 minutes, the one Contains 33% (v / v) solution of FINOX® DH ISO 9002 in water.
- the plates are then guided into the rinsing tub 3, where they are one Be rinsed with water by sprinkling. From there they will into a drying chamber with hot air at 105 ⁇ 5 ° C.
- the tarpaulins are then sent into the assembly chain to continue with the process Continue normal procedures to manufacture the appropriate device.
- the device From the environmental point of view, the device has how already stated above, via a circuit for reprocessing the Water and phosphoric acid and their return to the system. In addition to saving water and treatment product Avoid waste products that are harmful to the environment.
- the panels to be treated were introduced through zone 8 into oven 1, where they were heated to 375 ° C. After this step, they were in the liquid bath led, which contained the 33% (v / v) solution of FINOX® DM ISO 9002, where they remained for 4.5 minutes. Then they were led into the tub 3, where they have been irrigated with water. Of there they were led into a drying chamber with hot air at 105 ⁇ 5 ° C, from where they were sent to the assembly chain to match the normal Proceed with the processing of the plates to manufacture the equipment.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Treatment Of Metals (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
Description
- einen Ofen 1 zur Durchführung von Schritt (a);
- ein Bad 2 zur Durchführung von Schritt (b);
- ein Behälter 3 zur Durchführung von Schritt (c);
- einen Bereich bzw. eine Trockenkammer 4 zur Durchführung von Schritt (d),
Claims (12)
- Verfahren zur Behandlung von rostfreien Stählen, dadurch gekennzeichnet, daß es die folgenden Schritte umfaßt:a) Oxidation der Stahloberfläche undb) Entfernen der Oxidschicht.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Oxidation durch Erhitzen des Stahls, z.B. in Form von Platten, im Inneren einer Kammer, vorzugsweise in einem Ofen, auf eine Temperatur von 200 - 550°C; und das Entfernen der Oxidschicht durch Eintauchen des Stahls in ein Flüssig-Bad auf der Grundlage von Mineralsäure erfolgt.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Mineralsäure eine Phosphorsäure, insbesondere eine wässrige Lösung von Phosphorsäure ist.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Mineralsäure Salzsäure, Salpetersäure, Schwefelsäure, Chlorsäure, Perchlorsäure, Bromsäure, Perbromsäure, Iodsäure, Periodsäure, Kieselsäure, Wolframsäure, 12-Wolframatokieselsäure, 12-Wolframatophosphorsäure oder ein Gemisch aus zwei oder mehr von diesen oder anderen Mineralsäuren ist.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Temperatur in Schritt (a) 250-500°C, bevorzugterweise 300-400°C, beträgt.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Behandlung in Schritt (b) über einen Zeitraum von 1-10 min, bevorzugt 2-8 min, besonders bevorzugt 3-6 min, ganz besonders bevorzugt über einen Zeitraum von etwa 5 min, erfolgt.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Flüssig-Bad neben einer Mineralsäure auch einen oder mehrere grenzflächenaktive Stoffe (Surfactanten) enthält.
- Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß das Flüssig-Bad von Schritt (b) FINOX® DH ISO 9002, insbesondere eine 33%ige (v/v) wässrige Lösung von FINOX® DH ISO 9002, enthält.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der erhitzte Stahl entweder unmittelbar nach Schritt (a), d.h. ohne vorherige Abkühlung des Stahls, in das Flüssig-Bad eingetaucht wird oder daß der erhitzte Stahl zur Abkühlung auf 20-55°C kommt und dann in ein erwärmtes Flüssig-Bad von >50°C, vorzugsweise von >80°C, getaucht wird.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß sich an die Schritte (a) und (b) die weiteren Schritte (c) und/oder (d) anschließen:c) Spülen des behandelten Stahls mit Wasser, beispielsweise durch Beregnung im Inneren eines Spülbottichs; undd) Trocknen des gespülten Stahls, insbesondere mit Hilfe eines Luftstroms, insbesondere eines heißen Luftstroms, z.B. im Inneren einer Trockenkammer.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Temperatur des Luftstroms in Schritt (d) bei 50-150°C, insbesondere bei 70-130°C oder 80-120°C, besonders bevorzugterweise bei 90-110°C oder 95-110°C, liegt, wobei die Bereiche von 100°C ± 5°C und 105°C ± 5°C besonders geeignet sind.
- Verfahren nach Anspruch 9, dadurch gekennzeichnet, daß die Temperatur des Luftstroms in Schritt (d) bei 90-110°C oder 95-105°C liegt, wobei die Temperatur von 100°C besonders geeignet ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES9900126 | 1999-01-22 | ||
ES009900126A ES2162546B1 (es) | 1999-01-22 | 1999-01-22 | Metodo e instalacion para el tratamiento superficial del acero inoxidable. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1022357A1 true EP1022357A1 (de) | 2000-07-26 |
EP1022357B1 EP1022357B1 (de) | 2004-06-30 |
Family
ID=8307025
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00101186A Expired - Lifetime EP1022357B1 (de) | 1999-01-22 | 2000-01-21 | Verfahren zur Oberflächenbehandlung von rostfreien Stählen |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1022357B1 (de) |
AT (1) | ATE270353T1 (de) |
DE (1) | DE50006912D1 (de) |
ES (2) | ES2162546B1 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10064134A1 (de) * | 2000-12-19 | 2002-06-27 | Bsh Bosch Siemens Hausgeraete | Verfahren zum Veredeln von metallischen Oberflächen zur Vermeidung von thermischen Anlauf-Farben |
CN106835162A (zh) * | 2017-02-14 | 2017-06-13 | 江苏广通管业制造有限公司 | 一种不锈钢表面锈迹的清除方法 |
US20220195610A1 (en) * | 2019-07-24 | 2022-06-23 | Nippon Steel Corporation | Martensitic stainless steel pipe and method of manufacturing the same |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
LU64876A1 (de) * | 1971-03-03 | 1972-07-06 | Centre Rech Metallurgique | |
US4078949A (en) * | 1976-09-02 | 1978-03-14 | United States Steel Corporation | Method for improving the surface quality of stainless steels and other chromium-bearing iron alloys |
JPS62124019A (ja) * | 1985-11-22 | 1987-06-05 | Ishikawajima Harima Heavy Ind Co Ltd | 鋼材のスケ−ル除去方法 |
US5269957A (en) * | 1991-02-18 | 1993-12-14 | Taiho Industries Co., Ltd. | Rust removing agent for stainless steel surface |
JPH07286215A (ja) * | 1994-04-19 | 1995-10-31 | Kawasaki Steel Corp | ステンレス鋼板の製造方法 |
WO1998036044A1 (en) * | 1997-02-13 | 1998-08-20 | Crown Technology, Inc. | Rinse aid and process for stainless steel |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6233785A (ja) * | 1985-08-02 | 1987-02-13 | Honda Motor Co Ltd | 鋼材の塗装前処理方法 |
US5279707A (en) * | 1992-10-23 | 1994-01-18 | Time Savers | Die discoloration remover solution and method |
JP3073370B2 (ja) * | 1993-08-20 | 2000-08-07 | 三菱重工業株式会社 | 鉄鋼表面の塗装下地処理剤 |
-
1999
- 1999-01-22 ES ES009900126A patent/ES2162546B1/es not_active Expired - Fee Related
-
2000
- 2000-01-21 DE DE50006912T patent/DE50006912D1/de not_active Expired - Lifetime
- 2000-01-21 EP EP00101186A patent/EP1022357B1/de not_active Expired - Lifetime
- 2000-01-21 ES ES00101186T patent/ES2223321T3/es not_active Expired - Lifetime
- 2000-01-21 AT AT00101186T patent/ATE270353T1/de not_active IP Right Cessation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
LU64876A1 (de) * | 1971-03-03 | 1972-07-06 | Centre Rech Metallurgique | |
US4078949A (en) * | 1976-09-02 | 1978-03-14 | United States Steel Corporation | Method for improving the surface quality of stainless steels and other chromium-bearing iron alloys |
JPS62124019A (ja) * | 1985-11-22 | 1987-06-05 | Ishikawajima Harima Heavy Ind Co Ltd | 鋼材のスケ−ル除去方法 |
US5269957A (en) * | 1991-02-18 | 1993-12-14 | Taiho Industries Co., Ltd. | Rust removing agent for stainless steel surface |
JPH07286215A (ja) * | 1994-04-19 | 1995-10-31 | Kawasaki Steel Corp | ステンレス鋼板の製造方法 |
WO1998036044A1 (en) * | 1997-02-13 | 1998-08-20 | Crown Technology, Inc. | Rinse aid and process for stainless steel |
Non-Patent Citations (3)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 011, no. 344 (M - 640) 11 November 1987 (1987-11-11) * |
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 02 29 February 1996 (1996-02-29) * |
VOLLMER T. ; GUEMPEL P. ; BLAISE M. ; RACKY W.: "Oberflächenbehandlungsverfahren und deren Einfluss auf die Korrosionsbeständigkeit nichrostender Stähle", WERKSTOFFE UND KORROSION., vol. 46, no. 2, February 1995 (1995-02-01), VERLAG CHEMIE GMBM. WEINHEIM., DE, pages 92 - 96, XP002136840, ISSN: 0947-5117 * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10064134A1 (de) * | 2000-12-19 | 2002-06-27 | Bsh Bosch Siemens Hausgeraete | Verfahren zum Veredeln von metallischen Oberflächen zur Vermeidung von thermischen Anlauf-Farben |
WO2002050330A2 (de) * | 2000-12-19 | 2002-06-27 | BSH Bosch und Siemens Hausgeräte GmbH | Verfahren zum veredeln von metallischen oberflächen zur vermeidung von thermischen anlauf-farben |
WO2002050330A3 (de) * | 2000-12-19 | 2003-11-20 | Bsh Bosch Siemens Hausgeraete | Verfahren zum veredeln von metallischen oberflächen zur vermeidung von thermischen anlauf-farben |
CN106835162A (zh) * | 2017-02-14 | 2017-06-13 | 江苏广通管业制造有限公司 | 一种不锈钢表面锈迹的清除方法 |
US20220195610A1 (en) * | 2019-07-24 | 2022-06-23 | Nippon Steel Corporation | Martensitic stainless steel pipe and method of manufacturing the same |
Also Published As
Publication number | Publication date |
---|---|
EP1022357B1 (de) | 2004-06-30 |
ES2162546B1 (es) | 2003-05-01 |
DE50006912D1 (de) | 2004-08-05 |
ES2162546A1 (es) | 2001-12-16 |
ES2223321T3 (es) | 2005-03-01 |
ATE270353T1 (de) | 2004-07-15 |
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