DE752422C - Process for the treatment of light metals in nitrates or nitrate-nitrite mixtures and fused baths containing bichromate - Google Patents

Process for the treatment of light metals in nitrates or nitrate-nitrite mixtures and fused baths containing bichromate

Info

Publication number
DE752422C
DE752422C DED74553D DED0074553D DE752422C DE 752422 C DE752422 C DE 752422C DE D74553 D DED74553 D DE D74553D DE D0074553 D DED0074553 D DE D0074553D DE 752422 C DE752422 C DE 752422C
Authority
DE
Germany
Prior art keywords
nitrate
nitrates
treatment
alkaline
light metals
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
DED74553D
Other languages
German (de)
Inventor
Carl Albrecht
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.)
Evonik Operations GmbH
Original Assignee
Degussa 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 Degussa GmbH filed Critical Degussa GmbH
Priority to DED74553D priority Critical patent/DE752422C/en
Priority to CH201360D priority patent/CH201360A/en
Priority to AT160307D priority patent/AT160307B/en
Priority to FR831403D priority patent/FR831403A/en
Priority to GB3600937A priority patent/GB508541A/en
Application granted granted Critical
Publication of DE752422C publication Critical patent/DE752422C/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/002—Resistance welding; Severing by resistance heating specially adapted for particular articles or work
    • B23K11/004—Welding of a small piece to a great or broad piece
    • B23K11/0046—Welding of a small piece to a great or broad piece the extremity of a small piece being welded to a base, e.g. cooling studs or fins to tubes or plates
    • B23K11/0053—Stud welding, i.e. resistive
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/44—Methods of heating in heat-treatment baths
    • C21D1/46—Salt baths

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • Anti-Oxidant Or Stabilizer Compositions (AREA)
  • Luminescent Compositions (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Chemical Treatment Of Metals (AREA)

Description

Verfahren zur Behandlung von Leichtmetallen in Nitrate bzw. Nitrat-Nitrit-Gemische und Bichromat enthaltenden Schmelzbädern Es ist bekannt, für die Behandlung, insbesondere Vergütung von Leichtmetallen., wie Aluminium, Aluminiumlegierungen u. dgl., schmelzflüssige Bäder zu verwenden, welche Nitrate, wie Kaliumnitrat und. Natriumnitrat, bzw. Gemische solcher mit Nitriten, z. B. Kaliurnnitrit und Natriumnitrit, enthalten.Process for the treatment of light metals in nitrates or nitrate-nitrite mixtures and bichromate-containing melt baths It is known for treatment, in particular Remuneration of light metals, such as aluminum, aluminum alloys and the like, molten Baths use which contain nitrates, such as potassium nitrate and. Sodium nitrate or mixtures those with nitrites, e.g. B. potassium nitrite and sodium nitrite contain.

Fers ist weiterhin bekannt, Magnesium und Magnesiumlegierungen sowie Aluminium und Aluminiumlegierungen gegen Angriffe von Heizbädern aus Salzschmelzen dadurch zu schützen, daB die Schmelzen mit einem geringen Zusatz von Alkal.ichromaten oder Alkalibichro:maten oder Alkalifluo:riden versehen werden. Diese Zusätze' sollen bereits in; niedrigen Konzentrationen, beispielsweise r bis :2%, den. Angriff der Salzschmelzen auf das Metall b@zw. die Legierungen hintanhalten, indem spie anscheinend zur Bildung einer Schutzschicht beitragen. Es wurde festgestellt, daß bei längerer Verwendung von Nitrat- bzw. Nitrat-Nitrit-Schmelzen zur Behandlung von Leichtmetallen, insbesondere von Aluminium und Aluminiumlegierungen, Unzuträglichlceiten eintreten, die auf der Bildung alkalisch wirkender Verbindungen, wie Oxyde und Carbonate, beruhen und zur Folge haben, daß der Werkstoff des. Badgefäßes oder das behandelte Leichtmetall oder beide angegriffen werden. Man kann diese Schwierigkeiten dadurch beheben, daß man der Bildung und Ansammlung störender Mengen von alkalischen Stoffen in der Schmelze dadurch entgegenwirkt, da.ß Bichromate in zur Bindung der alkalischen Stoffe ausreichender Menge in das Bad eingeführt werden. Alkalichromate oder Alkalifluoride sind für diesen Zweck selbstverständlich nicht geeignet, da sie. keine Bindefähigkeit für Alkali besitzen.Fers is still known to have magnesium and magnesium alloys as well Aluminum and aluminum alloys against attacks from molten salt heating baths to protect the melts with a small addition of alkali dichromates or alkali dichromates or alkali fluorides are provided. These additions' are supposed to already in; low concentrations, for example r to: 2%, den. Attack the Melting salt on the metal b @ zw. hold back the alloys by apparently spitting contribute to the formation of a protective layer. It was determined, that with prolonged use of nitrate or nitrate-nitrite melts for treatment of light metals, especially aluminum and aluminum alloys, unfavorable conditions occur, which on the formation of alkaline compounds, such as oxides and carbonates, are based and have the consequence that the material of the bath vessel or the treated Light metal or both are attacked. You can face these difficulties by doing this fix that you avoid the formation and accumulation of disturbing amounts of alkaline substances in the melt counteracts the fact that bichromates bind the alkaline Substances of sufficient quantity are introduced into the bath. Alkali chromates or alkali fluorides are of course not suitable for this purpose, as they. no binding capacity for alkali own.

Bei Durchführung dieses Verfahrens hat sich aber herausgestellt, daß beim Zusatz deis Bichromats bei den hauptsächlich in Betracht kommenden Arbeitstemperaturen, z. B. solchen von 40o bis 55o1; nitrose Gase entwickelt werden, daß also ein Teil des Bichromats unter Zersetzung von Nitrit aufgezehrt wird.However, when carrying out this process it has been found that when adding the bichromate at the working temperatures mainly considered, z. B. those from 40o to 55o1; nitrous gases are developed, so that part of the bichromate is consumed with the decomposition of nitrite.

Dieser Übelstand wird erfindungsgemäß dadurch behoben., daß man das Bichromat in Mischung mit Badbestandteilen, z. B. Kaliumnitrat und/oder Natriumnitrat, in das Schmelzbad: einführt. Hierbei wird die Menge dies Verdünnungsmittels zweckmäßig so gewählt, daß sie das Fünffache der Menge des, angewendeten Bichromats überschreitet. Das Gemisch, von Bichromat und z. B. Alkalinitrat wird; vorteilhaft durch Maßnahmen, wie Zusammenschmelzen, Zusammenpressen, Eindampfen einer die beiden Komponenten enthaltenden Lösung, in den Zustand einer sehr innigen Mischung bzw. in handliche Form gebracht. Man kann z. B. aus der Schmelze oder dem Gemisch oder dem Eindampfprodukt Formkörper von gewünschter Gestalt und gewünschtem Inhalt herstellen und diese in das Bad einführen.According to the invention, this deficiency is remedied by the fact that the bichromate is mixed with bath components, e.g. B. potassium nitrate and / or sodium nitrate, in the weld pool: introduces. The amount of this diluent is expediently chosen so that it exceeds five times the amount of the bichromate used. The mixture of bichromate and z. B. Alkaline Nitrate; advantageously brought into the state of a very intimate mixture or in a manageable form by measures such as melting together, pressing together, evaporation of a solution containing the two components. You can z. B. from the melt or the mixture or the evaporation product molded bodies of the desired shape and desired content and introduce them into the bath.

Das Salzgemisch wird zweckmäßig bei Temperaturen in das Bad eingeführt, welche nicht sehr viel über dem Schmelzpunkt des Badinhalts liegen. Im allgemeinen hat es sich als vorteilhaft gezeigt, die Zugabe des Salzg°misches bei Temperaturen durchzuführen, die nicht mehr als ioo° über dem Schmelzpunkt des Badinhalts liegen.The salt mixture is expediently introduced into the bath at temperatures which are not very much above the melting point of the contents of the bath. In general it has been found to be advantageous to add the salt mixture at temperatures to be carried out, which are not more than 100 ° above the melting point of the bath contents.

Claims (3)

PATENTANSPRÜCHE: i. Verfahren zur Behandlung von Leichtmetallen in Nitrate bzw. Nitrat-Nitrit-Gemische und Bichromat enthaltenden Schmelzbädern, dadurch gekennzeichnet, daß man der Bildung und Ansammlung störender Mengen von alkalischen Stoffen dadurch entgegenwirkt, daß Bichromate in zur Bindung der alkalischen Stoffe ausreichender Menge in Mischung mit anderen Badbestandteilen, wie z. B. Alkalinitraten, in das Bad eingeführt werden. PATENT CLAIMS: i. Process for the treatment of light metals in Nitrates or nitrate-nitrite mixtures and melt baths containing bichromate, thereby characterized in that one of the formation and accumulation of disturbing amounts of alkaline Substances counteracts by the fact that bichromates in the binding of the alkaline substances sufficient amount mixed with other bath components, such as B. Alkaline nitrates, be introduced into the bathroom. 2. Verfahren nach, Anspruch i, gekennzeichnet durch Anwendung eines Gemisches, welches auf i Gewichtsteil Alkalibichromat ein Mehrfaches, z. B. 5 Gewichtsteile oder mehr, an den anderen üblichen Salzen, z. B. Alkalinitrat, enthält. 2. The method according to claim i, characterized by Use of a mixture which, for one part by weight of alkali dichromate, is a multiple, z. B. 5 parts by weight or more of the other common salts, e.g. B. Alkaline Nitrate, contains. 3. Verfahren nach den Ansprüchen i und 2, dadurch gekennzeichnet, daß der Zusatz des Salzgemisches bei Temperaturen erfolgt, die nicht erheblich höher als 1001 über dem Schmelzpunkt des Badinhalts liegen. Zur Abgrenzung des Erfindungsgegenstands vom Stand der Technik sind im Erteilungsverfahren folgende Druckschriften in Betracht gezogen worden: Österreich sche Patentschrift Nr. 129294; USA.-Patentschrift Nr. i 84o 562.3. The method according to claims i and 2, characterized in that the addition of the salt mixture takes place at temperatures which are not significantly higher than 1001 above the melting point of the bath contents. To distinguish the subject matter of the invention from the state of the art, the following publications were considered in the grant procedure: Austrian patent specification No. 129294; U.S. Patent No. i 84o 562.
DED74553D 1936-12-31 1937-02-10 Process for the treatment of light metals in nitrates or nitrate-nitrite mixtures and fused baths containing bichromate Expired DE752422C (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DED74553D DE752422C (en) 1936-12-31 1937-02-10 Process for the treatment of light metals in nitrates or nitrate-nitrite mixtures and fused baths containing bichromate
CH201360D CH201360A (en) 1936-12-31 1937-12-20 Process for regulating and maintaining the effectiveness of salt baths that can be used for the treatment of light metals.
AT160307D AT160307B (en) 1936-12-31 1937-12-21 Process for regulating and maintaining the effectiveness of baths used for the treatment of light metals and their alloys.
FR831403D FR831403A (en) 1936-12-31 1937-12-28 Method for regulating and maintaining the efficiency of salt baths usable for the treatment of light metals
GB3600937A GB508541A (en) 1936-12-31 1937-12-29 A process for regulating and maintaining the activity of melt baths adapted for the heat treatment of light metals and alloys thereof

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201360X 1936-12-31
DED74553D DE752422C (en) 1936-12-31 1937-02-10 Process for the treatment of light metals in nitrates or nitrate-nitrite mixtures and fused baths containing bichromate

Publications (1)

Publication Number Publication Date
DE752422C true DE752422C (en) 1952-11-04

Family

ID=25749987

Family Applications (1)

Application Number Title Priority Date Filing Date
DED74553D Expired DE752422C (en) 1936-12-31 1937-02-10 Process for the treatment of light metals in nitrates or nitrate-nitrite mixtures and fused baths containing bichromate

Country Status (5)

Country Link
AT (1) AT160307B (en)
CH (1) CH201360A (en)
DE (1) DE752422C (en)
FR (1) FR831403A (en)
GB (1) GB508541A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1840562A (en) * 1931-02-20 1932-01-12 Aluminum Co Of America Method of heat-treating aluminum and articles thereby
AT129294B (en) * 1929-12-11 1933-07-25 Ig Farbenindustrie Ag Process for protecting magnesium and magnesium alloys against attack by heating baths made from molten salt.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT129294B (en) * 1929-12-11 1933-07-25 Ig Farbenindustrie Ag Process for protecting magnesium and magnesium alloys against attack by heating baths made from molten salt.
US1840562A (en) * 1931-02-20 1932-01-12 Aluminum Co Of America Method of heat-treating aluminum and articles thereby

Also Published As

Publication number Publication date
GB508541A (en) 1939-06-29
FR831403A (en) 1938-09-02
CH201360A (en) 1938-11-30
AT160307B (en) 1941-04-10

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