标题
作者
作者:Gui, Y (Gui, Y.)[1 ]; Zheng, ZJ (Zheng, Z. J.)[2 ]; Gao, Y (Gao, Y.)[1,3 ]
期刊信息
摘要
The structure and compactness of the passive films on nanocrystalline (NC) and coarse crystalline (CC) 304 stainless steels (SSs) are investigated. A bi-layer passive film composed of an inner Cr2O3-rich layer and an outer Fe2O3-rich layer is obtained on both NC and CC 304SSs. The lower oxide formation potential U-ox(Cr) of chromium causes the Cr2O3-rich inner layer to form initially, and when the surface potential of the passive film increases due to Cr2O3 formation, Fe2O3 with a higher formation potential Uox(Fe) forms and predominates in the outer layer as a result of the higher diffusion rate of Fe than that of Cr across the inner layer. Compared with the CC-304SS, the inner layer of the passive film on the NC-304SS possesses a higher Cr2O3 content, which is attributed to the greater nucleation sites and faster growth rate of Cr2O3 in NC-304SS and is believed to be responsible for the higher compactness of the passive film on NC-304SS. (C) 2015 Elsevier B.V. All rights reserved.
关键词
作者关键词:Stainless steel; Bi-layer passive film; Compactness; Nanocrystalline
作者信息
通讯作者地址:Gao, Y (通讯作者)
 | S China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510641, Guangdong, Peoples R China. |
地址:
电子邮件地址:meygao@scut.edu.cn
出版商
类别分类
研究方向:Materials Science; Physics
Web of Science 类别:Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter