The failure feature is producing the black protruding corrosion-spot on the oxide scale for the aluminide coating on the Co-base superalloy DZ40M during high-temperature oxidation in air.

• DZ40M钴基合金铝化物涂层在高温氧化过程中的失效特点，是在氧化膜之上产生隆起的深色蚀点。