GB451823A - Improved corrosion resistant alloys - Google Patents

Abstract

Alloys particularly suitable for making pen nibs, chemical apparatus, reflectors, electrodes, and for dental and other purposes consist of nickel and 25-80 per cent of rhodium. Part of the rhodium may be replaced by up to 20 per cent of platinum or iridium, subject to there being at least 10 atomic per cent of rhodium and at least 20 atomic per cent of rhodium, platinum, and iridium present, and part of the nickel may be replaced by up to 55 per cent of palladium, up to 10 per cent of molybdenum or tungsten, or up to 20 per cent of copper, iron, or cobalt. In making the alloys, a scavenging element such as magnesium, zinc, manganese, silicon, boron, barium, calcium, titanium, or zirconium may be added in such amount as to leave up to 0,2 per cent of such element in the finished product. The rhodium used may be purified by melting it in a carbon-free crucible and subjecting it to alternate reduction and oxidation.