潮湿空气中应力耦合固态NaCl作用下GH4169合金的中温腐蚀行为研究  

Corrosion Behavior of GH4169 Alloy Under Flexural Tensile Stress and Beneath a NaCl Deposit Film in Water Vapor Containing Air at 600℃

作　　者：王文泉 崔宇 薛蕴鹏 刘莉[1] 王福会[1] WANG Wenquan;CUI Yu;XUE Yunpeng;LIU Li;WANG Fuhui(Shenyang National Laboratory for Materials Science,Northeastern University,Shenyang 110819,China;Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;AECC Shenyang Liming Aero-engine Co.,Ltd.,Shenyang 110862,China)

机构地区：[1]东北大学沈阳材料科学国家研究中心联合研究分部,沈阳110819 [2]中国科学院金属研究所师昌绪先进材料创新中心,沈阳110016 [3]中国航发沈阳黎明航空发动机有限责任公司,沈阳110862

出　　处：《中国腐蚀与防护学报》2024年第6期1399-1411,共13页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金联合基金(重点)(U22A20111)。

摘　　要：模拟了近海服役的飞机发动机压气机叶片的运行环境,研究了叶片典型材料GH4169在600℃潮湿空气中受固态NaCl耦合应力载荷作用影响的腐蚀行为及机制。结果表明,应力加速了GH4169在该环境中的腐蚀,使合金表面生成了NiCr_(2)O_(4)、NaNbO_(3)、Fe_(2)O_(3)、NiO、Cr_(2)O_(3)、Al_(2)O_(3)及NiFe_(2)O_(4)等腐蚀产物的混合物。应力促使GH4169发生了活化内腐蚀,内腐蚀产物为不连续颗粒状Cr_(2)O_(3)以及少量Fe_(2)O_(3)和NbO。经标准制度热处理的GH4169倾向于发生不均匀沿晶内腐蚀,固溶热处理的GH4169为相对均匀的内腐蚀带。活化腐蚀过程导致基体中产生了贫Cr区和贫Fe区,在该区域中Cr及Fe空位导致Ni-Cr-Fe晶胞的稳定性下降。Corrosion behavior of high temperature alloy GH4169 under tensile stress while beneath a solid NaCl deposit film was studied in water vapor containing air at 600℃to simulate the service conditions of aircraft engine compressors in the marine environment.The results show that the applied tensile stress accelerates the corrosion of GH4169 in the environment,resulting in the formation of a complex mixture of NiCr_2O_4,NaNbO_(3),Fe_(2)O_(3),NiO,Cr_(2)O_(3),Al_(2)O_(3)and NiFe_(2)O_(4)on the alloy surface.The applied tensile stress could induce active internal corrosion of GH4169.The internal corrosion products were discontinuous granular Cr_(2)O_(3)and a small amount of Fe_(2)O_(3)and NbO.After normal heat treatment the GH4169 alloy tends to have non-uniform intergranular corrosion,while the solid-solution heat-treated ones exhibited a relatively uniform internal corrosion zone.The active corrosion process leads to the formation of Cr and Fe depletion regions in the matrix,and the Cr and Fe vacancies in this region lead to the deteriorated stability of Ni-Cr-Fe cells.

关 键 词：GH4169 NACL 内腐蚀 弹性应力 

分 类 号：TG174[金属学及工艺—金属表面处理]