GH909合金热盐腐蚀行为及力学性能衰减研究  

Hot Salt Corrosion Behavior and Mechanical Property Reduction of GH909 Alloy

作　　者：淳道勇 詹中伟 葛玉麟 孙志华 CHUN Daoyong;ZHAN Zhongwei;GE Yulin;SUN Zhihua(Guiyang Military Representative Office of Guangzhou Bureau of Naval Equipment Department of PLA Navy,Guiyang 550014,China;Aviation Key Laboratory of Science and Technology on Ad-vanced Corrosion and Protection for Aviation Material,AECC Beijing Institute of Aeronautical Materi-als,Beijing 100095,China)

机构地区：[1]海装广州局贵阳军代室,贵州贵阳550014 [2]中国航发北京航空材料研究院航空材料先进腐蚀与防护航空科技重点实验室,北京100095

出　　处：《电镀与精饰》2022年第12期11-16,共6页Plating & Finishing

摘　　要：在盐雾环境和高温工况下,航空发动机的GH909合金等零件会发生严重的热盐腐蚀,进而影响其服役性能。本文采用高温涂盐腐蚀实验,研究GH909合金的热盐腐蚀行为,采用腐蚀增重测试拟合了GH909合金的热盐腐蚀动力学;采用扫描电镜等观察了GH909合金的腐蚀形貌;采用拉伸测试和旋转弯曲疲劳测试检测GH909合金热盐腐蚀不同时间的力学性能,并对疲劳断口进行分析。研究结果显示,GH909合金热盐腐蚀过程中持续增重,但增重速率逐渐降低;腐蚀过程为均匀腐蚀,GH909合金表面的腐蚀裂纹逐渐加宽加深,并形成孔洞结构,经过100 h后的腐蚀深度可达40μm左右,并有持续深入的趋势。热盐腐蚀对GH909合金的室温及650℃高温拉伸性能影响不明显,对高温旋转弯曲疲劳寿命有一定降低。Under combination of salty environment and high temperature,severe hot salt corrosion will significantly erode metallic parts of aero engine and weaken their mechanical property,such as GH909 alloy.Hot salt corrosion behavior of GH909 alloy was studied.The corrosion mass gains were measured and derived to simulate hot salt corrosion kinetics of GH909 alloy.The corrosion morphology was inves-tigated by SEM.The tensile and rotating bending fatigue properties were tested at different corrosion time.The results indicate that corrosion mass gain continuously increases,with decreasing gain rate.A uniform corrosion morphology of GH909 alloy is observed during the hot salt corrosion test.By extend-ing the corrosion time,the cracks on surface generally propagate both in width and depth.After 100 h of hot salt corrosion,the linked cracks turn to pore structure,with a 40μm depth and deepening tenden-cy.The tensile strength of GH909 alloy at room temperature and 650℃is barely undermined by hot salt corrosion.However,the rotating bending fatigue life of GH909 alloy remarkably declines.

关 键 词：GH909合金 热盐腐蚀 腐蚀动力学 力学性能 

分 类 号：TQ153.2[化学工程—电化学工业]