Abstract
The corrosion behavior of Ni-10Ta-20P, Ni-10Ta and Ni-20P alloys in 12 M HCl solution open to air at 30°C was investigated in order to clarify the roles of tantalum and phosphorus. Additions of 10 at% tantalum and 20 at% phosphorus to the nickel alloy result in excellent corrosion resistance and in the accumulation of tantalum and phosphorus in the surface film on this alloy owing to dissolution of the nickel from just after immersion, the highly protective passive film formed being stable during prolonged immersion. By contrast, the binary nickel alloy with only a tantalum addition is not passivated and dissolves actively, forming a thick corrosion product film. The nickel alloy containing only phosphorus is not corrosion-resistant, forming a nickel phosphate film, although the film is more stable than that formed on the nickel alloy containing only tantalum.
| Original language | English |
|---|---|
| Pages (from-to) | 321-332 |
| Number of pages | 12 |
| Journal | Corrosion Science |
| Volume | 39 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 1997 Feb |
Keywords
- A. alloy
- B. XPS
- C. passive films
ASJC Scopus subject areas
- Chemistry(all)
- Chemical Engineering(all)
- Materials Science(all)