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Platinum Metals Rev., 1964, 8, (4), 130

Corrosion Resistance of Iridium and Ruthenium

Attack by Liquid Metals

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Recent progress in methods of fabricating iridium and ruthenium has focused attention on their special properties of high melting points and resistance to chemical attack. D. W. Rhys and E. G. Price have now reported (Metal Ind., 1964 (August 20th), 243-245) the results of tests designed to show the amount of attack by nineteen liquid metals on sintered specimens of iridium and ruthenium contained in crucibles of the same material. Under the test conditions neither iridium nor ruthenium were attacked by lithium, sodium, potassium, silver, gold, mercury, Iridium, or lead. Copper, cadmium, tellurium and tin did not attack ruthenium, and bismuth did not attack iridium. Calcium, gallium, and bismuth only slightly attacked ruthenium, and gallium also only slightly attacked iridium.

Some alloying and/or solution occurred with ruthenium for magnesium, zinc, aluminium, and antimony. Iridium was affected by these metals and also by copper, calcium, cadmium, tin and tellurium.

The most severe attack occured with zinc by rapid solution.

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