Corrosion resistant amorphous chromium alloy compositions

• US 4,696,703 A
• Filed: 07/15/1985
• Issued: 09/29/1987
• 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: Grasselli, Robert K., Henderson, Richard S., Tenhover, Michael A.
• Primary Examiner(s): DEAN, RICHARD
• Application Number:
  US06/755,247
• Time in Patent Office: 806 Days
• Field of Search: 148/403, 420/428, 420/588
• US Class Current: 148/403
• CPC Class Codes: C22C 45/006 with Cr as the major constituent

Abstract

An amorphous metal alloy composition exhibiting corrosion resistance in acidic environments of the formula:

Cr.sub.a M.sub.b B.sub.c C.sub.d R.sub.e

wherein

M is at least one metal selected from the group consisting of Mo, W, Nb and Ta;

R is at least one element selected from the group consisting of N, P, As, S and Se; and

wherein

a ranges from about greater than 0.4 to about 0.6;

b ranges from about 0.15 to about less than 0.4; and

c ranges from zero to about 0.16.

d ranges from zero to about 0.2; and

e ranges from zero to about 0.3;

with the proviso that the sum of (c+d+e) ranges from about 0.04 to about 0.35.

Claims

1. An amorphous metal alloy of the formula

View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)

2. The amorphous metal alloy in accordance with claim 1 wherein:

a ranges from about 0.45 to about 0.55;

b ranges from about 0.20 to about 0.35; and

(c+d+e) ranges from about 0.15 to about 0.25.

3. The amorphous metal alloy in accordance with claim 1 wherein:

a is about 0.50;

b ranges from about 0.25 to about 0.30; and

(c+d+e) ranges from about 0.20 to about 0.25.

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

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

6. The amorphous metal alloy in accordance with claim 1 wherein said amorphous metal alloy comprises Cr, Mo and N.

7. The amorphous metal alloy in accordance with claim 6 wherein said amorphous metal alloy has an approximate composition Cr₅₀ Mo₃₀ N₂₀.

8. The amorphous metal alloy in accordance with claim 6 wherein said amorphous metal alloy has an approximate composition Cr₄₀ Mo₄₀ N₂₀.

9. The amorphous metal alloy in accordance with claim 1 wherein said amorphous metal alloy comprises Cr, Mo and P.

10. The amorphous metal alloy in accordance with claim 9 wherein said amorphous metal alloy has an approximate composition Cr₅₀ Mo₂₅ P₂₅.

11. The amorphous metal alloy in accordance with claim 1 wherein said amorphous metal alloy comprises Cr, Mo and As.

12. The amorphous metal alloy in accordance with claim 11 wherein said amorphous metal alloy has an approximate composition of Cr₅₀ Mo₂₅ As₂₅.

13. The amorphous metal alloy in accordance with claim 1 wherein said amorphous metal alloy comprises Cr, Mo and S.

14. The amorphous metal alloy in accordance with claim 13 wherein said amorphous metal alloy has an approximate composition of Cr₅₀ Mo₂₅ S₂₅.

15. The amorphous metal alloy in accordance with claim 1 wherein said amorphous metal alloy comprises Cr, Ta and N.

16. The amorphous metal alloy in accordance with claim 15 wherein said amorphous metal alloy has an approximate composition of Cr₅₀ Ta₃₀ N₂₀.

17. The amorphous metal alloy in accordance with claim 1 wherein said amorphous metal alloy comprises Cr, Ta and P.

18. The amorphous metal alloy in accordance with claim 17 wherein said amorphous metal alloy has an approximate composition of Cr₅₀ Ta₃₀ P₂₀.

19. The amorphous metal alloy in accordance with claim 1 wherein said amorphous metal alloy is synthesized by chemical vapor deposition.

20. The amorphous metal alloy in accordance with claim 1 wherein said amorphous metal alloy is synthesized by RF sputtering.