US1953003A - Heat treatment of light metals - Google Patents
Heat treatment of light metals Download PDFInfo
- Publication number
- US1953003A US1953003A US499975A US49997530A US1953003A US 1953003 A US1953003 A US 1953003A US 499975 A US499975 A US 499975A US 49997530 A US49997530 A US 49997530A US 1953003 A US1953003 A US 1953003A
- Authority
- US
- United States
- Prior art keywords
- magnesium
- potassium
- heat treatment
- fused
- 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 - Lifetime
Links
- 229910052751 metal Inorganic materials 0.000 title description 16
- 239000002184 metal Substances 0.000 title description 16
- 150000002739 metals Chemical class 0.000 title description 9
- 238000010438 heat treatment Methods 0.000 title description 8
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 10
- 229910052749 magnesium Inorganic materials 0.000 description 10
- 239000011777 magnesium Substances 0.000 description 10
- 229910000861 Mg alloy Inorganic materials 0.000 description 9
- 229910002651 NO3 Inorganic materials 0.000 description 8
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 8
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 8
- 229910052700 potassium Inorganic materials 0.000 description 8
- 239000011591 potassium Substances 0.000 description 8
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- 238000007669 thermal treatment Methods 0.000 description 6
- 230000000704 physical effect Effects 0.000 description 5
- 235000010333 potassium nitrate Nutrition 0.000 description 4
- 239000004323 potassium nitrate Substances 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical class [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- 150000004673 fluoride salts Chemical class 0.000 description 2
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- QLOKJRIVRGCVIM-UHFFFAOYSA-N 1-[(4-methylsulfanylphenyl)methyl]piperazine Chemical compound C1=CC(SC)=CC=C1CN1CCNCC1 QLOKJRIVRGCVIM-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 description 1
- 239000011876 fused mixture Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 239000011833 salt mixture Substances 0.000 description 1
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
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
Definitions
- the present invention relates to improvements in means for heating light metals, particularly magnesium and magnesium alloys, in connection with processes for the improvement of mechanical properties of such metals by means of thermal treatment, and is more especially concerned with a new composition to be used for said purpose.
- metals which are to be subjected to a heat treatment are immersed in fused salts or salt mixtures heated to the requisite temperature for the purpose of rapidly heating such metals and at the same time excluding any possibility of attack by the constituents of the atmosphere upon such heated metals.
- nitrate of potassium has been frequently proposed, that salt recommending itself for the purpose because of its low melting point and thus rendering heat treatment possible within a comparatively wide temperature range.
- An object of the present invention is to obviate this corrosive action of fused nitrate of potassium compositions upon magnesium and magnesium alloys or work pieces made of such metals. It has been ascertained that the incorporation of chromates and dichromates or fluorides of the alkali metals, even when in comparatively small percentages, such as about 1-2 percent by weight, entirely prevents the corrosive action of the fused nitrate of potassium upon the-metal for all practical purposes. This is probably due to the fact that the presence of such added substances causes the formation of a protective layer upon the surface of the metal.
- Example 1 Sheets of a magnesium alloy of equal shape and size were subjected to a contact of 5 to 30 minutes respectively, at a temperature of about 350 C. with fused nitrate of potassium, with or without the added protective substances according to the invention, the decrease in weight corresponding tothe intensity of attack being shown 2.
- a process of improving the physical proper- I ties of magnesium and magnesium alloys by thermal treatment between about 350-400 0. which comprises subjecting the metal to-contact with a fused composition heated to the desired temperature, said composition chiefly consisting of nitrate of potassium containing from about 1 to 2 percent of a water-soluble dichromate.
- a process of improving the physical properties of magnesium and magnesium alloys by thermal treatment between 350-400" C. which comprises immersing the metal infused potassium nitrate containing a small percentage of a compound selected from the group consisting of chromates, dichromates and fluorides of the alkali metals.
- a process of improving the physical properties of magnesium and magnesium alloys by thermal treatment between 350-400 C. which comprises immersing the metal in fused potassium nitrate containing a small percentage of a water-soluble chromate.
- a process of improving the physical properties of magnesium and magnesium'alloys by thermal treatment between 350-400 C. which comprises immersing the metal in fused potassium nitrate containing a small percentage of potassium chromate.
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Description
Patented Mar. 21, 1934 UNITED STATES 1,953,003 HEAT TREATMENT or LIGHT METALS Josef Martin Michel, Bitterfeld, Germany,
signor, by mesne assignments, to Magnesi Development Corporation, a corporation of Delaware No Drawing. Application December 4, 1930, Serial No. 499,975. In Germany December 11,
7 Claims. .'(Ol. 148-15) The present invention relates to improvements in means for heating light metals, particularly magnesium and magnesium alloys, in connection with processes for the improvement of mechanical properties of such metals by means of thermal treatment, and is more especially concerned with a new composition to be used for said purpose.
' According to well known processes, metals which are to be subjected to a heat treatment are immersed in fused salts or salt mixtures heated to the requisite temperature for the purpose of rapidly heating such metals and at the same time excluding any possibility of attack by the constituents of the atmosphere upon such heated metals. As a salt of this kind, nitrate of potassium has been frequently proposed, that salt recommending itself for the purpose because of its low melting point and thus rendering heat treatment possible within a comparatively wide temperature range.
However, when employing fused nitrate of potassium for the purpose of heating magnesium and magnesium alloys to temperatures between about 350-400" C.annealing at such temperatures being required for improving certain physical properties of these metals according to a known processit has been ascertained that the work pieces, particularly when in sheet form, are a strongly attacked by the fused salt even when the duration of contact is but comparatively short. It has been observed that the decrease in weight of such sheets-giving a measure of the intensity of the attackranges between about 2.1 and 7.5 grs. per square meter per hour, depending on the duration of contact.
An object of the present invention is to obviate this corrosive action of fused nitrate of potassium compositions upon magnesium and magnesium alloys or work pieces made of such metals. It has been ascertained that the incorporation of chromates and dichromates or fluorides of the alkali metals, even when in comparatively small percentages, such as about 1-2 percent by weight, entirely prevents the corrosive action of the fused nitrate of potassium upon the-metal for all practical purposes. This is probably due to the fact that the presence of such added substances causes the formation of a protective layer upon the surface of the metal.
The following figures show the decided difference produced by the presence, in the fused mixture, of the added protective substances according to the present invention, in comparison with the employment of nitrate of potassium alone.
Example 1 Sheets of a magnesium alloy of equal shape and size were subjected to a contact of 5 to 30 minutes respectively, at a temperature of about 350 C. with fused nitrate of potassium, with or without the added protective substances according to the invention, the decrease in weight corresponding tothe intensity of attack being shown 2. A process of improving the physical proper- I ties of magnesium and magnesium alloys by thermal treatment between about 350-400 0., which comprises subjecting the metal to-contact with a fused composition heated to the desired temperature, said composition chiefly consisting of nitrate of potassium containing from about 1 to 2 percent of a water-soluble dichromate.
3. A composition for the .heat treatment of magnesium and magnesium alloys within the temperature range of about 350-400 C., consisting of nitrate of potassium containing a small percentage of an alkali fluoride.
4. A process of improving the physical properties of magnesium and magnesium alloys by thermal treatment between 350-400" C., which comprises immersing the metal infused potassium nitrate containing a small percentage of a compound selected from the group consisting of chromates, dichromates and fluorides of the alkali metals.
5. A process of improving the physical properties of magnesium and magnesium alloys by thermal treatment between 350-400 C., which comprises immersing the metal in fused potassium nitrate containing a small percentage of a water-soluble chromate.
6. A process of improving the physical properties of magnesium and magnesium'alloys by thermal treatment between 350-400 C., which comprises immersing the metal in fused potassium nitrate containing a small percentage of potassium chromate.
'7. A process of improving the physical properties of magnesium and magnesium alloys by thermal treatment between 350-400 0., which comprises immersing the metal in fused potassium nitrate containing a small percentage of potassium dichromate.
Certificate of Correction Patent No. 1,953,003. March 27, 1934.
JOSEF MARTIN MICHEL I It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1, after line 65, insert the following tables: I
Duration of contaot 5 minutes Composition of the Change in weight in grams per and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Ofiice.
Signed and sealed this 8th day of May, A. D. 1934.
[SEAL] BRYAN M. BATTEY,
Acting Commissz'soner of Patents.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1953003X | 1929-12-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1953003A true US1953003A (en) | 1934-03-27 |
Family
ID=7769554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US499975A Expired - Lifetime US1953003A (en) | 1929-12-11 | 1930-12-04 | Heat treatment of light metals |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1953003A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2464922A (en) * | 1947-11-13 | 1949-03-22 | Int Nickel Co | Prevention of pencilling corrosion of metallic salt bath electrodes |
| US2582129A (en) * | 1948-09-13 | 1952-01-08 | Nat Aluminate Corp | Prevention of corrosion in aqueous systems |
-
1930
- 1930-12-04 US US499975A patent/US1953003A/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2464922A (en) * | 1947-11-13 | 1949-03-22 | Int Nickel Co | Prevention of pencilling corrosion of metallic salt bath electrodes |
| US2582129A (en) * | 1948-09-13 | 1952-01-08 | Nat Aluminate Corp | Prevention of corrosion in aqueous systems |
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