Ni含量对Co-Al-W合金热腐蚀行为的影响  

Hot Corrosion Behavior of New Type Co-Al-W Superalloys with Different Ni Contents

作　　者：王华 王英杰 刘恩泽 WANG Hua;WANG Yingjie;LIU Enze(Department of Naval Equipment,Xi'an 710021,China;School of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,China;Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]海军装备部,西安710021 [2]江苏科技大学、材料科学与工程学院,镇江212100 [3]中国科学院金属研究所,沈阳110016

出　　处：《中国腐蚀与防护学报》2023年第6期1419-1426,共8页Journal of Chinese Society For Corrosion and Protection

基　　金：科技部重点研发计划(2021YFC2202402);国家自然科学基金(51471079)。

摘　　要：研究不同Ni含量的Co-9Al-9.5W合金在900℃涂覆75%Na_(2)SO_(4)+25%NaCl熔融盐的热腐蚀行为。测试了合金的腐蚀动力学曲线,利用扫面电镜观察腐蚀产物,利用XRD分析腐蚀样品表面产物类型。结果表明,合金的腐蚀进程兼具氧化和硫化的特征;随着合金中Ni含量的增加,合金的抗热腐性能力提高。合金的热腐蚀产物主要由NiO,CoO,Al_(2)S_(3)和CoNiO_(2)组成,并进一步探讨了钴基合金的热腐蚀机制。The hot corrosion behavior of Co-based alloys Co-9Al-9.5W-xNi(x=5,15,20,atomic frac-tion,%)beneath a film of molten salts mixture of 75%Na_(2)SO_(4)+25%NaCl in air at 900℃ were investigat-ed by means of mass change measurement,SEM with EDS and XRD.The focus of the research is on the influence of Ni on hot corrosion resistance of the alloy Co-9Al-9.5W and the morphology and composi-tion of the formed corrosion products.The results showed that the hot corrosion of the alloys may be characterized by both sulfidation and oxidation;with the increase of Ni content,the hot corrosion resis-tance of the alloy could be notably improved.The corrosion products scales on the three Co-based alloys were most composed of NiO,CoO,Al_(2)S_(3) and CoNiO_(2).Finally,the hot corrosion mechanism of the Co-based alloy in the presence of 75%Na_(2)SO_(4) and 25%NaCl deposits is also discussed.

关 键 词：CO-AL-W合金 热腐蚀 NI 热腐蚀机制 

分 类 号：TG174[金属学及工艺—金属表面处理]