Corrosion resistance of electrodeposited amorphous Ni-Cr-P alloys
The outstanding corrosion resistance of amorphous Ni-Cr-P alloys (with >10 at. % Cr and >20 at. % P) prepared by rapid liquid quenching encourages the development of an electroplating bath for the deposition of these alloys. We used a chloride-based bath of Cr(III) and Ni, with hypophosphite or phosphorous acid as the phosphorus source and citrate ion as a complexing agent, to produce such a bath. Anodic polarization and current decay at constant potential were performed on amorphous electrodeposits with varying Cr content in pitting (HCl) and non-pitting (H/sub 2/SO/sub 4/) electrolytes. The electrodeposits demonstrated outstanding corrosion resistance in both electrolytes, especially when their Cr content exceeded ca. 10 at. %, when compared to crystalline Ni, amorphous NiP, 304 SS, and Hastelloy C-276. 8 refs., 8 figs., 1 tab.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5742670
- Report Number(s):
- SAND-87-1077C; CONF-8710257-1; ON: DE88005116
- Country of Publication:
- United States
- Language:
- English
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