The bi-layer structure and the higher compactness of a passive film on nanocrystalline 304 stainless steel
The bi-layer structure and the higher compactness of a passive film on nanocrystalline 304 stainless steel
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纳米晶304不锈钢钝化膜的双层结构和更高的致密性
DOI：
10.1016/j.tsf.2015.12.039
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发表时间：
2016-01-29
期刊：
影响因子：
2.1
通讯作者：
Gao, Y.
中科院分区：
文献类型：
--
作者：
Gui, Y.;Zheng, Z. J.;Gao, Y.
研究了纳米晶（NC）和粗晶（CC）304不锈钢钝化膜的结构和致密性。在NC和CC 304不锈钢上均获得了由内层富Cr2 O3层和外层富Fe 2 O3层组成的双层钝化膜。铬的较低的氧化物形成电位U-ox（Cr）导致最初形成富含Cr2 O3的内层，并且当钝化膜的表面电位由于Cr2 O3的形成而增加时，由于Fe的扩散速率高于Cr的扩散速率，形成具有较高形成电位Uox（Fe）的Fe 2 O3并在外层中占优势。与CC-304不锈钢相比，NC-304不锈钢钝化膜内层Cr2 O3含量较高，这是由于NC-304不锈钢中Cr2 O3的形核位置较多，生长速度较快，从而使NC-304不锈钢钝化膜致密。(C)2015 Elsevier B. V.版权所有。
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.