GB498017A - Method of stabilising saltpetre melts used in the heat-treatment of alloys - Google Patents

Method of stabilising saltpetre melts used in the heat-treatment of alloys

Info

Publication number
GB498017A
GB498017A GB18352/37A GB1835237A GB498017A GB 498017 A GB498017 A GB 498017A GB 18352/37 A GB18352/37 A GB 18352/37A GB 1835237 A GB1835237 A GB 1835237A GB 498017 A GB498017 A GB 498017A
Authority
GB
United Kingdom
Prior art keywords
dichromate
alloys
saltpetre
treatment
heat
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
GB18352/37A
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.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie AG
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 IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Publication of GB498017A publication Critical patent/GB498017A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/607—Molten salts

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Fertilizers (AREA)

Abstract

Saltpetre baths for the heat-treatment of alloys, especially aluminium alloys, are stabilized by adding an alkali-metal dichromate in a quantity exceeding 2 per cent but below 25 per cent, the quantity depending on and increasing with the temperature at which the melts are to be used. The chromate may be replaced by molybdates, tungstates, vanadates or manganates, and, instead of the alkaline metal compounds, the corresponding alkaline earth compounds may be used. If free alkali is present in the bath, such an amount of dichromate is added simultaneously to the melt that the dichromate is converted into monochromate. The dichromate and monochromate may be added in the form of a mixture.
GB18352/37A 1936-07-22 1937-07-01 Method of stabilising saltpetre melts used in the heat-treatment of alloys Expired GB498017A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE498017X 1936-07-22

Publications (1)

Publication Number Publication Date
GB498017A true GB498017A (en) 1939-01-02

Family

ID=6545257

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18352/37A Expired GB498017A (en) 1936-07-22 1937-07-01 Method of stabilising saltpetre melts used in the heat-treatment of alloys

Country Status (1)

Country Link
GB (1) GB498017A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1009057B (en) * 1952-03-04 1957-05-23 Parker Pen Co pen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1009057B (en) * 1952-03-04 1957-05-23 Parker Pen Co pen

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