Corrosion resistant amorphous chromium-metalloid alloy compositions

• US 4,701,226 A
• Filed: 07/15/1985
• Issued: 10/20/1987
• Est. Priority Date: 07/15/1985
• Status: Expired due to Fees

• Current Assignee: Standard Oil Company (BP PLC)
• Original Assignee: Standard Oil Company (BP PLC)
• Inventors: Henderson, Richard S., Tenhover, Michael A., Shreve, Gary A.
• Primary Examiner(s): DEAN, RICHARD
• Application Number:
  US06/755,250
• Time in Patent Office: 827 Days
• Field of Search: 148/403, 420/428
• US Class Current: 148/403
• CPC Class Codes: C22C 45/006 with Cr as the major constituent

Abstract

Amorphous chromium-metalloid alloys exhibiting corrosion resistance in acid environments are described. The alloys contain a relatively low amount of a metalloid selected from the group of B, C, P, N, S, Sb and As. Additional metalloid elements such as Al, Si and Ge may also be present to enhance other properties of the amorphous alloy.

Claims

1. Amorphous metal alloy of the formula:

ti Cr_1-x M_x

wherein

M is one element selected from the group consisting of B, C, P, N. S, Sb and As; and

when M is B, x ranges from about 0.04 to about 0.16.,

when M is C, x ranges from about 0.04 to about 0.20, and

when M is P, N. S, Sb and As, x ranges from about 0.04 to about 0.30.

2. The amorphous metal alloy in accordance with claim 1 wherein said alloy includes an element M'"'"', wherein M'"'"' is at least one element selected from the group consisting of Si, Al and Ge, and wherein M'"'"' is present in the alloy in an amount that is less than or equal to 0.5(x), and not greater than 0.10.

3. The amorphous metal alloy in accordance with claim 1 wherein said amorphous metal alloy is at least 80 percent amorphous.

4. The amorphous metal alloy in accordance with claim 1 wherein said amorphous metal alloy is about 100 percent amorphous.

5. An amorphous metal alloy of the formula:

space="preserve" listing-type="equation">Cr.sub.1-x M.sub.x

wherein

M is at least two elements selected from the group consisting of B, C, P, N, S, Sb and As; and

wherein

that portion of x due to B ranges from about 0.04 to about 0.16;

that portion of x due to C ranges from about 0.04 to about 0.20; and

that portion of x due to P, N, S, Sb and As ranges from about 0.04 to about 0.30;

with

the provisos that x ranges from about 0.04 to about 0.30;

that portion of x due to M when M is B and/or C and when other M elements are present ranges from about 0.04 to about 0.15; and

the ratio of (x due to M when M is B and/or C and when other M elements are present) to (1-x) is less than or equal to 0.5.

6. The amorphous metal alloy in accordance with claim 5 wherein said alloy includes an element M'"'"', wherein M'"'"' is at least one element selected from the group consisting of Si, Al and Ge, and wherein M'"'"' is present in the alloy in an amount that is less than or equal to 0.5(x), and not greater than 0.10.

7. The amorphous metal alloy in accordance with claim 5 wherein said amorphous metal alloy is at least 80 percent amorphous.

8. The amorphous metal alloy in accordance with claim 5 wherein said amorphous metal alloy is about 100 percent amorphous.