多孔NiCr在750℃ NaCl沉积盐中的热腐蚀机理研究  

Hot Corrosion of Porous NiCr Alloy With NaCl Deposit at 750°C

作　　者：陈凌云[1,2] 兰昊[2] 黄传兵[2] 杨滨[1,3] 房师阁[2] 张伟刚[2] CHEN Lingyun;LAN Hao;HUANG Chuanbing;YANG Bin;FANG Shige;ZHANG Weigang(State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing,Beijing 100083, China;State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering,Chinese Academy of Sciences, Beijing 100190, China;Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing,Beijing 100083, China)

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083 [2]中国科学院过程工程研究所多相复杂系统国家重点实验室,北京100190 [3]北京科技大学钢铁共性技术协同创新中心,北京100083

出　　处：《航空制造技术》2017年第8期32-36,共5页Aeronautical Manufacturing Technology

基　　金：国家自然科学基金(51471159);中国科学院青年创新促进会(2017067)

摘　　要：针对飞机发动机高压压气机NiCr系可磨耗封严涂层发生的NaCl热沉积盐高温腐蚀现象,采用粉末烧结法制备了多孔80Ni20Cr合金,研究了其在750℃空气气氛中的NaCl热腐蚀行为。采用X射线衍射和能谱分析等技术对腐蚀产物进行了分析。结果表明,NaCl固体盐通过阻碍合金表面生成连续致密的Cr_2O_3,加速多孔NiCr的腐蚀和氧化。研究发现,在样品外表面形成的Cr_2O_3、NiO、NiCr_2O_4混合氧化物膜易开裂剥落,是合金加速腐蚀的主要方式。此外,通过同步热分析并结合热力学模拟计算发现,NiCr合金的热腐蚀由氯化-氧化协同控制,初始依靠NaCl与Cr元素反应引发合金的循环腐蚀,并推动整个腐蚀过程不断进行。In order to elucidate NaCl-induced hot corrosion of NiCr-based abradable coatings in high-pressure compressor,the porous80Ni20Cr alloy was prepared by powder metallurgic process.The hot corrosion of porous NiCr alloywith NaCl deposit at750°C was investigated by SEM,EDS and XRD.Results show that NaCl accelerates the oxidation ofNiCr alloy by preventing the formation of continuous and compact Cr2O3.And cracks can be observed in the oxide scalewhich consists of Cr2O3,NiO and NiCr2O4.Furthermore,the corrosion mechanism is also discussed by TG-DSC and thermodynamicscalculations.Cr could react with NaCl,accelerating the corrosion of NiCr porous alloy by chlorination andoxidation.

关 键 词：NACL 热腐蚀 涂层 多孔NiCr 

分 类 号：V263[航空宇航科学与技术—航空宇航制造工程]