The compact and even surface of iridium coating was deposited on the rhenium metal by arc ion plating.
The microstructure and composition of as-deposited iridium coating were analyzed, and the oxidation resistance of
the iridium coating at different temperature was also studied. The isothermal oxidation resistance of the iridium coating
kept well up to 4 hours at 1 800℃ and up to 2 hours at 2 000℃, respectively. After 120 times of the cyclic oxidation
test at 1 950℃,the surface and cross-section of the Re/ Ir kept compactly and no peeling is detected.