Claims
- 1. A method of treating a low-antimony battery grid lead alloy prior to casing comprising the steps of:
- (a) bringing said alloy into a molten state; and
- (b) adding between 0.001 to 0.010 wt-% of phosphorus to said molten alloy,
- said alloy comprising between 2.25 and 2.75% antimony.
- 2. The invention of claim 1 wherein said alloy further comprises between 0.25 and 0.50 wt-% tin, between 0.01 and 0.08 wt-% copper, between 0.003 and 0.01 wt-% sulfur, and between 0.01-0.05 wt-% arsenic.
- 3. A method of increasing the castability of low-antimony battery grid alloy and for refining the grain structure of and increasing the resistance to cracking of battery grids cast therefrom, comprising the steps of:
- (a) bringing a fifty ton kettle of 2.25 to 2.75 wt-% antimony-containing lead alloy into the molten state; and
- (b) introducing between one and five pounds of phosphorus into said kettle over the surface of said alloy to treat said alloy prior to using said alloy to cast said battery grids.
- 4. The invention of claim 3 wherein the weight of phosphorus added to said molten material is approximately 5 pounds.
- 5. The invention of claim 3 wherein said phosphorus is red phosphorus.
- 6. The invention of claim 3 wherein said alloy further comprises between 0.25 and 0.50 wt-% tin, between 0.01 and 0.08 wt-% copper, between 0.003 and 0.01 wt-% sulfur, between 0.01 and 0.5 wt-% arsenic, with the remainder of said alloy being lead.
RELATED APPLICATIONS
This application is a continuation-in-part of our prior co-pending patent application entitled, "Method Of Treating Low Antimony Battery Grid Material With Phosphorus," Ser. No. 734,311, filed Oct. 20, 1976, which application is hereby specifically incorporated by reference as if fully set forth herein.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
842801 |
Morrison |
Jan 1907 |
|
2163369 |
Betterton et al. |
Jun 1939 |
|
3879217 |
Peters |
Apr 1975 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
734311 |
Oct 1976 |
|