铝含量对镍铝合金在稀硫酸溶液中的腐蚀行为影响  

Effect of Aluminum Content on Corrosion Behavior of Ni-Al Alloys in Dilute Sulfuric Acid Solution

作　　者：杜广 芦国强 邓龙辉[1] 蒋佳宁 曹学强[1] DU Guang;LU Guoqiang;DENG Longhui;JIANG Jianing;CAO Xueqiang(State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;AECC Shenyang Liming Aero-Engine Co.,Ltd.,Shenyang 110043,China)

机构地区：[1]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430070 [2]中国航发沈阳黎明航空发动机有限责任公司,沈阳110043

出　　处：《中国腐蚀与防护学报》2024年第4期1011-1021,共11页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(92060201)。

摘　　要：镍基高温合金(NiCrAlY)常用于航空发动机的热端部件。热端部件如燃烧室、导向叶片和动叶片需要热障涂层(TBCs)保护。TBCs由抗氧化的金属粘结层(BC)和起隔热作用的陶瓷层(TC)组成。BC材料也是NiCrAlY合金,其Al和Cr含量比NiCrAlY基体高许多,导致BC的腐蚀电位比基体低53mV,BC发生电偶腐蚀。本文采用了不同Al含量的NiAl合金,研究Al含量对NiAl合金在稀H_(2)SO_(4)中腐蚀行为的影响。研究表明,Ni95Al5的腐蚀电位最高,腐蚀电流密度最小;Ni_(75)Al_(25)腐蚀电位较低。研究证明,BC中Al含量高是导致BC在自然环境下发生腐蚀的原因。Ni-based high-temperature alloys(NiCrAlY)are commonly used in the hot sections of aerospace engines.Hot section components such as combustion chambers,guide vanes,and turbine blades require thermal barrier coatings(TBCs)for protection.TBCs consist of an oxidation-resistant metal bond coat(BC)and a ceramic top coat(TC)that provides thermal insulation.The BC material is also NiCrAlY alloy,with Al and Cr content higher than the substrate Ni-based high-temperature alloys,leading to a 53 mV lower corrosion potential for BC compared to the substrate,therefore,resulting in galvanic couple with the BC.Herein,the influence of different Al contents in NiAl alloys on their corrosion behavior in dilute H_(2)SO_(4),simulating the corrosive environment was studied.The result reveals that Ni95Al5 exhibits the highest corrosion potential and the lowest corrosion current density,while Ni75Al25 has a lower corrosion potential.The research demonstrates that a high Al content in the BC is the primary cause of corrosion in conditions of natural environment.KEYWORDS NiAl alloy,dilute sulfuric acid,electrochemical behavior,corrosion product sion in conditions of natural environment.

关 键 词：NIAL合金 稀硫酸 电化学行为 腐蚀产物 

分 类 号：O646.6[理学—物理化学]