Electrochemical response of Fe65.5Cr4Mo4Ga4P12 C5B5.5 bulk amorphous alloy in different aqueous media

✍ Scribed by I. Chattoraj; S. Baunack; M. Stoica; A. Gebert

• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: German
• Weight: 332 KB
• Volume: 55
• Category: Article
• ISSN: 0947-5117
• DOI: 10.1002/maco.200303693

✦ Synopsis

A bulk amorphous Fe 65.5 Cr 4 Mo 4 Ga 4 P 12 C 5 B 5.5 alloy was investigated for its electrochemical behaviour in different electrolytes. The investigations showed substantial differences in response between the rapidly quenched and cast samples of the same composition. Annealing of the cast samples improved their corrosion resistance, which was possibly due to structural relaxation processes. The alloy was found to have very good resistance to neutral and slightly acidic chloride solutions in the rapidly quenched form.

The passivation observed could not be attributed to any metal/metalloid oxide and was most probably due to an adsorbed oxygen layer. No chromium or molybdenum enrichment was observed at the surface. However, a sub-surface phosphorus enrichment was observed in rapidly quenched samples, in the as-received state as well as after electrochemical treatments, which may be responsible for their improved corrosion resistance.