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DE2127452A1 - Descaling titanium (alloys) - esp after pressing using an hydrofluoric acid bath - Google Patents

Descaling titanium (alloys) - esp after pressing using an hydrofluoric acid bath

Info

Publication number
DE2127452A1
DE2127452A1 DE19712127452 DE2127452A DE2127452A1 DE 2127452 A1 DE2127452 A1 DE 2127452A1 DE 19712127452 DE19712127452 DE 19712127452 DE 2127452 A DE2127452 A DE 2127452A DE 2127452 A1 DE2127452 A1 DE 2127452A1
Authority
DE
Germany
Prior art keywords
hydrofluoric acid
esp
alloys
descaling
titanium
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.)
Pending
Application number
DE19712127452
Other languages
German (de)
Inventor
Werner 5882 Meinerzhagen Steiger
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.)
FUCHS FA OTTO
Original Assignee
FUCHS FA OTTO
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 FUCHS FA OTTO filed Critical FUCHS FA OTTO
Priority to DE19712127452 priority Critical patent/DE2127452A1/en
Publication of DE2127452A1 publication Critical patent/DE2127452A1/en
Pending legal-status Critical Current

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
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/10—Other heavy metals
    • C23G1/106—Other heavy metals refractory metals

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)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

High melting metals, esp. Ti (alloys), are descaled in a bath of hydrofluoric acid (concn. >38%). This process is esp. suitable for metals coated with silicates such as glass used as lubricants during pressing, and can be applied to metal articles of complex shape. The bath can be cooled to counteract heating resulting from the descaling process.

Description

Verfahren zur Entzunderung von hochschmelzenden Metallen, insbesondere von Titan oder Titanleqierungen Die Erfindung betrifft ein Verfahren zur Entzunderung von hochschmelzenden Metallen, insbesondere von Titan oder Titanlegierungen. Der sogenannte Zunder, der insbesondere aus Metalloxyden besteht, tritt in der Regel nach der Wärmebehandlung der Metalle auf.Process for the descaling of refractory metals, in particular of titanium or titanium alloys The invention relates to a method for descaling of refractory metals, especially titanium or titanium alloys. Of the so-called scale, which consists in particular of metal oxides, usually occurs after the heat treatment of the metals.

Bisher wurde der Zunder durch Sandstrahlen entfernt. Dieses Verfahren eignet sich jedoch nicht für komplizierte Teile, bei denen der Sandstrahl nicht alle verzunderten Stellen erreicht. Insbesondere bei Preßteilen aus Titan oder Titanlegierungen erweist sich die Entzunderung als schwierig, da diese Teile an ihrer Oberfläche zusätzlich noch mit einem Schmelzüberzug aus Silikaten, insbesondere Glas, überzogen sind. Diese Silikate werden in Form von Pulvern vorher auf die Oberfläche der Teile aufgebracht und dienen während des Preßvorgangs als Schmiermittel.So far, the scale has been removed by sandblasting. This method however, it is not suitable for complicated parts that are not subject to sandblasting all scaled spots reached. Especially with pressed parts made of titanium or titanium alloys Descaling proves to be difficult because these parts are on their surface additionally coated with an enamel coating made of silicates, in particular glass are. These silicates are in the form of powders beforehand on the surface of the parts applied and serve as a lubricant during the pressing process.

Die Aufgabe der Erfindung besteht darin, ein Verfahren zur Entzunderung von hochschmelzenden Metallen vorzuschlagen, welches es ermöglicht, auch komplizierte Formteile aus hochschmelzenden Metallen zu entzundern Zur Lösung dieser Aufgabe wird vorgeschlagen, die verzunderten Teile in ein Bad aus Flußsäure zu tauchen. Insbesondere Versuche mit Titan und Titanlegierungen haben gezeigt, daß Flußsäure die Metalloxyde in hervorragender Weise löst und dabei das Grundmetall in kaum nennenswertem Maße angreift. Besonders vorteilhaft wird dieses erfindungsgemäße Verfahren bei den Titanteilen, die während des Preßvorgangs mit Silikatschichten, beispielsweise Glas, überzogen worden sind. Bekanntermaßen löst Flußsäure Glas.The object of the invention is to provide a method for descaling of refractory metals to propose, which makes it possible, even complicated Descaling moldings made from refractory metals To solve this problem it is proposed to immerse the scaled parts in a bath of hydrofluoric acid. In particular, tests with titanium and titanium alloys have shown that Hydrofluoric acid dissolves the metal oxides in an excellent way and thereby the base metal attacks to a negligible extent. This is particularly advantageous according to the invention Process for the titanium parts that are covered with silicate layers during the pressing process, for example glass, have been coated. It is known that hydrofluoric acid dissolves glass.

Zur Erfindung gehört auch der Vorschlag, eine Flußsäure mit einer Konzentration von über 38 bis 40 X zu verwenden.The invention also includes the proposal to use a hydrofluoric acid Concentration of over 38 to 40 X to use.

Wässrige Fluß säuren sind wesentlich aggressiver und daher nicht verwendbar. Sie stellen gewissermaßen ein Beizmittel dar.Aqueous hydrofluoric acids are much more aggressive and therefore cannot be used. In a sense, they represent a pickling agent.

Zur Durchführung des Verfahrens werden die Metallteile, insbesondere Preßteile, nach der Abkühlung in das Flußsäurebad getaucht. Nach 15 bis 45 min haben sich der Zunder und gegebenenfalls der Glasüberzug gelöst, die Formteile können dem Bad entnommen und in einer der bekannten Beizlösungen gebeizt werden. Infolge der Reaktion der Flußsäure mit den Metalloxyden erwärmt sich das Flußsäurebad. Es kann daher von Vorteil sein, dieses Bad zu kühlen. Da ein solches Flußsäurebad durch den gelösten Zunder und die Silikate zunehmend verschmutzt wird, muß ein solches Bad von Zeit zu Zeit erneuert werden.To carry out the method, the metal parts, in particular Pressed parts, immersed in the hydrofluoric acid bath after cooling. After 15 to 45 minutes If the scale and, if necessary, the glass coating are loosened, the molded parts can removed from the bath and pickled in one of the known pickling solutions. As a result The hydrofluoric acid bath warms up when the hydrofluoric acid reacts with the metal oxides. It can therefore be an advantage to cool this bath. Since such a hydrofluoric acid bath through the dissolved scale and the silicates are increasingly contaminated, must be such Bathroom to be renewed from time to time.

Claims (3)

Patent ansprüche Patent claims Verfahren zur Entzunderung von hochschmelzenden Metallen, insbesondere von Titan oder Titanlegierungen, dadurch gekennzeichnet, daß die verzunderten Teile in ein Bad aus Flußsäure getaucht werden.Process for the descaling of refractory metals, in particular of titanium or titanium alloys, characterized in that the scaled parts be immersed in a bath of hydrofluoric acid. 2. Verfahren nach Anspruch 1, gekennzeichnet durch die Verwendung einer Flußsäure mit einer Konzentration von über 38 %.2. The method according to claim 1, characterized by the use a hydrofluoric acid with a concentration of over 38%. 3. Verwendung des Verfahrens nach den Ansprüchen 1 und 2 zur Entzunderung von hochschmelzenden Metallen, die mit Silikaten, beispielsweise Glas, als Schmiermittel bei der Preßverarbeitung überzogen sind.3. Use of the method according to claims 1 and 2 for descaling of refractory metals with silicates, such as glass, as lubricants are coated in the press processing.
DE19712127452 1971-06-03 1971-06-03 Descaling titanium (alloys) - esp after pressing using an hydrofluoric acid bath Pending DE2127452A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19712127452 DE2127452A1 (en) 1971-06-03 1971-06-03 Descaling titanium (alloys) - esp after pressing using an hydrofluoric acid bath

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712127452 DE2127452A1 (en) 1971-06-03 1971-06-03 Descaling titanium (alloys) - esp after pressing using an hydrofluoric acid bath

Publications (1)

Publication Number Publication Date
DE2127452A1 true DE2127452A1 (en) 1972-12-14

Family

ID=5809654

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19712127452 Pending DE2127452A1 (en) 1971-06-03 1971-06-03 Descaling titanium (alloys) - esp after pressing using an hydrofluoric acid bath

Country Status (1)

Country Link
DE (1) DE2127452A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0048622A1 (en) * 1980-09-22 1982-03-31 Uop Inc. Method for improving the electrical conductivity of a steel surface having a coating of ferrous oxide

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0048622A1 (en) * 1980-09-22 1982-03-31 Uop Inc. Method for improving the electrical conductivity of a steel surface having a coating of ferrous oxide

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