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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 6    December 2001

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Electroplating process of amorphous Fe-Ni-Cr alloy
HE Xiang-zhu(何湘柱)1, XIA Chang-bin(夏畅斌)1, WANG Hong-jun(王红军)2,
GONG Zhu-qing(龚竹青)3, JIANG Han-ying(蒋汉瀛)3

1. Department of Chemical Engineering,  Xiangtan Polytechnic University,
Xiangtan 411201, P.R.China;
2. Department of Mechanical, and Electronic Engineering,
Guangdong University of Technology, Guangzhou 510090, P.R.China;
3. Department of Metallurgical Science and Engineering,
Central South University, Changsha  410083, P.R.China

Abstract:A novel process of electroplating amorphous Fe-Cr-Ni alloy in chloride aqueous solution with Fe(Ⅱ), Ni(Ⅱ) and Cr(Ⅲ) was reported. Couple plasma atomic emission spectrometry (ICP-AES), X-ray diffractometry(XRD), scanning electronic microscopy(SEM), microhardness test and rapid heating-cooling method were adopted to detect the properties of the amorphous Fe-Ni-Cr deposit, such as composition, crystalline structure, micrograph, hardness, and adherence between deposit and substrate. The effects of the operating parameters on the electrodeposit of the amorphous Fe-Ni-Cr alloy were discussed in detail. The results show that a 8.7?μm thick mirrorlike amorphous Fe-Ni-Cr alloy deposit, with Vicker's hardness of 530 and composition of 45%~55% Fe, 33%~37% Ni, 9%~23% Cr was obtained by electroplating for 20min at room temperature(10~30℃), cathode current 10~16A/dm2, pH=1.0~3.0. The XRD patterns show that there only appears a broad hump around 2θ of 41°~47° for the amorphous Fe-Ni-Cr alloy deposit, while the SEM micrographs show that the deposit contains only a few fine cracks but no pinholes.

 

Key words:  amorphism; Fe-Ni-Cr alloy; electroplating; trivalent chromium; chloride

ISSN 1672-7029
CN 43-1423/U

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