Abstract
NiCoCrAlY coatings were prepared using laser cladding technology and subjected to a continuous hot corrosion test in a eutectic Na2SO4/NaCl (75:25, wt. %/wt. %) salt at 800 ℃ in air. The corrosion kinetics curves of the NiCoCrAlY coating and the untreated substrate over 100 h of hot corrosion were compared and analyzed. The results show that in the early stage of hot corrosion, a chemical reaction that produces alkaline fusion near the oxide scale takes place at the molten salt/coating interface, causing Al2O3/Cr2O3 to form and dissolve continuously. In the late stage, a new continuous Al2O3 film is formed.
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