Nanosegregation of ternary Cr-Ni-Fe alloy deposits electrodeposited from a Cr3+-based bath

被引：5
作者：
Huang, Ching An [1 ]
Chen, Chao Yu [1 ]
Mayer, Joachim [2 ]
Weirich, Thomas [2 ]
Iskandar, Riza [2 ]
机构：
[1] Chang Gung Univ, Dept Mech Engn, Tao Yuan, Taiwan
[2] Rhein Westfal TH Aachen, Cent Facil Electron Microscopy, D-52074 Aachen, Germany
来源：
MATERIALS LETTERS | 2013年 / 93卷
关键词：
Electrodeposition; Electron microscopy; Multilayer structure; Microstructure; TRIVALENT CHROMIUM ELECTRODEPOSITION; COATINGS; ELECTROLYTES; BEHAVIOR; ACID;
D O I：
10.1016/j.matlet.2012.11.033
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A laminar structure with nanosized segregation was observed in Cr-Ni-Fe alloy deposits electroplated in a Cr3+-based bath with Ni2+ and Fe2+ ions. The formation of laminar structure could be attributed to the depletion of preferentially reduced ions, or cathodic polarization, adjacent to the cathodic surface. This nanosized segregation could be clearly observed with scanning-transmission-electron microscope in high-angle angular dark-field (HAADF) mode. A crystalline Fe-rich alloy deposit with a grain size of 4 nm can be achieved with an electroplating current density of 15 A dm(-2), whereas an amorphous Cr-rich alloy deposit was produced with 25 A dm(-2). Owing to the approach toward thermal equilibrium in the two-phase field, uphill diffusion took place in the Cr-rich alloy deposit during annealing at 500 degrees C, forming a Cr- and Fe-rich multilayer. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：107 / 110
页数：4
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