电弧离子镀Ni-Co-Cr-Al-Y-Si-B涂层的热腐蚀性能

HOT CORROSION BEHAVIOR OF Ni-Co-Cr-Al-Y-Si-B COATING DEPOSITED BY AIP

采用电弧离子镀技术在DZ125和DSM11两种镍基高温合金基材上沉积Ni-Co-Cr-Al-Y-Si-B涂层,研究了高温合金基材及其Ni-Co-Cr-Al-Y-Si-B涂层在900℃的75％Na2SO4+25％K2SO4熔盐中的热腐蚀行为.结果表明,Ni-Co-Cr-Al-Y-Si-B涂层在热腐蚀过程中生成了连续致密的α-Al2O3氧化膜,有效地保护了合金基材免受腐蚀破坏,合金基材的热腐蚀性能对体系后期的热腐蚀行为影响很大.

Ni-Co-Cr-Al-Y-Si-B coatings were deposited on Ni base superalloys DZ125 and DSM11 by arc ion plating (AIP). The corrosion behaviors of DZ125, DSM11 and Ni-Co-Cr-Al-Y-Si-B coating in molten 75%Na2SO4+25%K2SO4 at 900 ℃ were studied. The results indicate that the coating can protect the DZ125 and DSM11 alloys from hot corrosion destruction due to the formation of a continuous and dense α-Al2O3 scale. In the last stage of the hot corrosion process, the hot corrosion behaviors of base alloys have important influences on behaviors of the whole systems.