Claims
- 1. A method of forming amorphous ternary nickel-phosphorus-chromium alloy deposits by electrodeposition on an electrically conductive substrate, comprising subjecting said substrate to an applied current density between about 20 and 40 A/dm.sup.2 at a temperature from the range of about 20 .degree. to 30.degree. C. in a bath comprising: a chromium salt and a nickel salt in a weight ratio of about 3:1, a phosphorus source at about 0.3M P concentration; about 0.3M of a complexing agent; about 0.1M of a supporting salt; and about 1.0M of buffer.
- 2. The method of claim 1, wherein the phosphorus source is sodium hypophosphite.
- 3. The method of claim 1, wherein the phosphorus source is a mixture of phosphorus acid and phosphoric acid in a weight ratio of about 5:4.
- 4. The method of claim 1, wherein the chromium and nickel salts are chlorides.
- 5. The method of claim 1, wherein the complexing agent is selected from the group consisting of sodium citrate, sodium lactate, sodium succinate, glycine, and mixtures thereof.
- 6. The method of claim 1, where the supporting salt is ammonium chloride.
- 7. The method of claim 1, wherein the buffer is formic acid.
- 8. The method of claim 1, wherein the substrate is steel.
- 9. A method for electrodepositing amorphous nickel-chromium-phosphorus alloys on an electroconductive substrate, comprising subjecting the substrate to an applied current density between about 200 to about 300 mA/cm.sup.2, at room temperature, in a bath at about pH 3.0, comprising
- ______________________________________NiCl.sub.2.6H.sub.2 O 30 g/lCrCl.sub.3.6H.sub.2 O 100 g/lHCOOH 35 ml/lKBr 17.3 g/lNH.sub.4 Cl 50 g/lNa.sub.3 (citr.).2H.sub.2 O 80 g/lH.sub.3 BO.sub.3 35 g/lNaH.sub.2 PO.sub.2.H.sub.2 O 30 g/l______________________________________
- 10. The method of claim 9, wherein a 5:4 by weight mixture of phosphorous acid and phosphoric acid is used in place of sodium hypophosphite.
Government Interests
The U.S. Government has rights in this invention pursuant to Contract No. DE-AC04-76DP00789 between the U.S. Department of Energy and the AT&T Technologies, Inc.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3917517 |
Jordan et al. |
Nov 1975 |
|
4461680 |
Lashmore |
Jul 1984 |
|