Non-ferrous metal cover gases

Inactive Publication Date: 2010-09-30
HONEYWELL INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0023]In addition, this present technology relates to molten reactive metal having a protective film on its surface that is formed by a reaction between the metal and a composition containing an effective amount of fluoroolefin of the present technology, preferably said amount being effective under the intended circumstances to at least partially passivate the surface of the metal, thereby reducing the chemical reactivity of the metal, especially the metal's oxidative reactivity.
[0024]According to another aspect of the present technology, methods are provided for impeding the oxidation of a molten nonferrous metal exposed to and oxygen-containing gas, such as air, comprising: (a) providing molten nonferrous metal, such as magnesium, having a surface; (b) exposing said surface to a cover gas composition that includes at least one fluoroo

Problems solved by technology

Certain non-ferrous metals, such as magnesium, aluminum, and lithium, are highly reactive and oxidatively unstable.
However, SF6 suffers from several disadvantages, including: its sulfur-based decomposition products at high temperature are very toxic; it is expensive and has limited sources of supply; and it is a known greenhouse gas having, at a time horizon of 100 years, a Global Warming Potential (GWP) of 23,900 relative to 1 for carbon di

Method used

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  • Non-ferrous metal cover gases

Examples

Experimental program
Comparison scheme
Effect test

Example

Example 1

[0042]A quartz tube having a well was equipped with a metered source of cover gas and a thermocouple which was placed in the well. The well was filled with about 0.2 to 0.3 g of solid magnesium pieces. The cover gas was a mixture of air (a carrier gas) and trans-HFO-1234ze. The air and the trans-HFO-1234ze were provided from separate cylinders and the relative amounts of each entering the mixture were controlled to give composition of about 4.5% trans-HFO-1234ze by volume.

[0043]The tube containing the magnesium was placed in an oven. A flow of cover gas through the tube and over the well containing the magnesium was then established at about 1 liter / minute. The oven was then heated to about 700° C. The flow of cover gas proceeded until a surface film was formed on the magnesium or the magnesium ignited.

[0044]After the test was complete, the magnesium was removed from the oven and visually inspected to determine the quality of the cover gas.

[0045]The magnesium contained a wh...

Example

Example 2

[0046]The experiment of Example 1 was repeated, except that the cover gas contained about 1.5% trans-HFO-1234ze by volume.

[0047]The magnesium contained a white coating and the pieces were not stuck together indicating that the magnesium was well protected.

Example

Example 3

[0048]The experiment of Example 1 was repeated, except that the cover gas nominally contained about 0.5% trans-HFO-1234ze by volume. In this experiment, the actual measurement of the amount of trans-HFO-1234ze was 0.46% trans-HFO-1234ze by volume.

[0049]The magnesium contained a white coating and the pieces were not stuck together indicating that the magnesium was well protected.

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Abstract

Disclosed are cover gas compositions comprising fluoroolefins for impeding the oxidation of molten nonferrous metals and alloys, such as magnesium. The cover gas compositions can include at least one fluoroolefin and a carrier gas.

Description

RELATED APPLICATIONS[0001]This application is a continuation-in-part of U.S. application Ser. No. 11 / 691,276, filed on Mar. 26, 2007, currently pending, which claims the priority of U.S. Provisional Application No. 60 / 818,416, filed on Jul. 3, 2006. The contents of U.S. application Ser. No. 11 / 691,276 and U.S. Provisional Application No. 60 / 818,416 are incorporated herein by reference in their entirety.FIELD OF THE INVENTION[0002]The present technology relates to cover gas compositions for molten nonferrous metal, such as magnesium, and methods of using the same to prevent the oxidation when the metal is exposed to air.DESCRIPTION OF RELATED ART[0003]Certain non-ferrous metals, such as magnesium, aluminum, and lithium, are highly reactive and oxidatively unstable. For example, molten magnesium is readily and violently oxidized in ambient air or dry air, burning with a flame temperature of approximately 2820° C. Three approaches have been suggested to inhibit these severe oxidation p...

Claims

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Application Information

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IPC IPC(8): C22B9/00C22B26/22C22B21/00C22B26/12C22C23/00C22C21/00C22C24/00
CPCC07C21/18C22B9/006C22B26/22C22B26/12C22B21/064Y02P10/122
Inventor LULY, MATTHEW H.SINGH, RAJIV R.RICHARD, ROBERT G.
Owner HONEYWELL INT INC
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