The roles or Tantalum and phosphorus in the corrosion behavior of Ni-Ta-P alloys in 12M HCI

摘要

The corrosion behavior of Ni-10Ta-20P, Ni-10Ta and Ni-20P alloys in 12M HCl solution open to air at 30 deg.C was investigated in order to clarify the roles of tantalum and phosphorus. Additions of 10 at/100 tantalum and 20 at/100 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.