物理化学学报 >> 2000, Vol. 16 >> Issue (10): 920 -925 .doi: 10.3866/PKU.WHXB20001010

研究论文 上一篇    下一篇

Fe-50Cu纳米涂层的制备及氧化行为

李远士, 牛炎, 吴维   

  1. 金属腐蚀与防护实验室,中国科学院金属研究所,沈阳 110015
  • 收稿日期:2000-01-24 修回日期:2000-05-14 发布日期:2000-10-15
  • 通讯作者: 李远士 E-mail:ysli@icpm.syb.ac.cn

Preparation of Fe-50Cu Nanocrystalline Coating and Its Oxidation Performance

Li Yuan-Shi, Niu Yan, Wu Wei   

  1. State Key Laboratory for Corrosion and Protection,Institute of Metal Research,The Chinese Academy of Sciences,Shenyang 110015
  • Received:2000-01-24 Revised:2000-05-14 Published:2000-10-15
  • Contact: Li Yuan-Shi E-mail:ysli@icpm.syb.ac.cn

摘要:

为探讨晶粒尺寸变化对多相合金氧化行为的影响,采用磁控溅射技术制备了 Fe-50Cu过饱和固溶体纳米涂层,并利用热重实验对比研究了该涂层与同成分的铸态合金在 800℃空气中的氧化行为 .结果表明,铸态合金中形成了包括铁和铜的氧化物及其复合氧化物在内的复杂外氧化膜,同时发生了铁的内氧化 .涂层中发生了铁的单一外氧化,但涂层退化后,合金基体中仍出现铁的内氧化 .这种氧化模式的转变机制在于涂层尺寸的纳米化显著扩展了铁在铜中的溶解度,并且大量晶界为氧和铁提供了短路扩散通道,改变了初始氧化膜结构及随后的界面条件 .

关键词: Fe-50Cu, 纳米化, 氧化模式

Abstract:

 A super-saturated solution of Fe-50Cu nanocrystalline coating was prepared using magnetron sputtering, and thermogravimetric analysis was performed at 800℃ in air both for the coating and as-cast Fe-50Cu alloy, in order to study the effect of grain size changes on the oxidation behavior of the two-phase alloys. The results showed that a complex external scale containing the oxides of iron and copper and their double oxides had been formed in the as-cast alloy, combined with an internal oxidation of iron. However, an exclusive external oxidation of iron took place for the coating after a short time, while an internal oxidation of iron was present again in the matrix once the coating degraded completely. The transition mechanism of the above oxidation modes was attributed to an enlarged solubility of iron in copper provided by the grain size reduction in the coating, and also to the presence of high density of grain boundaries both in the coating and in the oxide layer, which could act as short-circuit diffusion paths and therefore resulted in the changes of the microstructure of the initial oxide scale. 

Key words: Fe-Cu, Nanocrystallization, Oxidation mode