Coating for metal alloy

A metal alloy comprising rhenium and one or more additives selected from the group consisting of aluminum, bismuth, calcium, chromium, cobalt, copper, gold, hafnium, iridium, iron, lanthanum, magnesium, manganese, molybdenum, nickel, niobium, osmium, platinum, rare earth metals, rhodium, ruthenium, silver, tantalum, technetium, titanium, tungsten, vanadium, yttrium, zinc, and zirconium;

• a combined weight percentage of rhenium and said one or more additives in said metal alloy is at least 98 wt. %;
• at least a portion of an outer surface of said metal alloy includes an enhancement coating material that was applied to said outer surface of said metal alloy;
• said enhancement coating material includes that includes two or more elements selected form the group consisting of carbon, nitrogen, titanium, oxygen, zirconium and silicon;
• said enhancement coating material includes nitrides and/or oxides;
• said enhancement coating material includes a) at least 90 wt. % carbon, b) at least 40 wt. % chromium and one or more of nitrogen, carbon and oxygen, c) at least 20 wt. % titanium and one or more of nitrogen, oxygen, and carbon, and d) at least 5 wt. % zirconium and one or more of nitrogen, oxygen and carbon.