应用化学2025，Vol.42Issue(7)：930-944,15.DOI:10.19894/j.issn.1000-0518.240427
热障涂层在大气环境下的腐蚀
Corrosion of Thermal Barrier Coatings in Atmospheric Environment
摘要
Abstract
Thermal barrier coatings(TBCs)have been widely used for the protection of high-temperature metallic components of aero,space and land-based gas turbine engines,and other weapons,etc.The structure of TBCs basically consists of metallic substrate,metallic bond coat(BC)and ceramic top coat.The substrate material is Ni-based super alloy MCrAlY(M=Ni,Co),usually some trace elements are added,such as Re,W,Ta,Si and so on.The metallic bond coat also consists of MCrAlY with much more Cr and Al for better anti-oxidation.The ceramic top coating is usually yttria stabilized zirconia(YSZ).After deposition of TBCs and being stored in natural environment for longer than half a month,some corrosion spots could be observed.The corrosion phenomenon is more obvious in May to July with hot,rainy and humid environment.By means of Laser ablation-inductively coupled plasma-mass spectroscopy(LA-ICP-MS),distribution of Ni,Co,Cr,Al,Zr and Y in the TBCs depth was analyzed,and the formation of corrosion spots is revealed to be a result of outward diffusion of corrosion products.BC has more Al than the substrate,leading to the Galvanic corrosion of BC.Acidic air pollutants or acidic impurities in TBCs pore sealer are electrolytes of Galvanic corrosion.Reducing acidic impurities and drying TBCs before the pore sealer spraying are effective methods to stop the BC corrosion.关键词
热障涂层/粘结层/腐蚀斑点Key words
Thermal barrier coatings/Bond coat/Corrosion spots分类
化学化工引用本文复制引用
曹学强,曾佳敏,石瑶,袁颖菁,方向,杜广,邓龙辉,蒋佳宁..热障涂层在大气环境下的腐蚀[J].应用化学,2025,42(7):930-944,15.基金项目
国家自然科学基金重点支持项目(No.92060201)资助 Supported by the National Natural Science Foundation of China(No.92060201) （No.92060201）
