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直流电沉积纳米晶铁-镍-铬合金箔工艺、性能及其机理研究(PDF)

《纳米技术与精密工程》[ISSN:1672-6030/CN:12-1351/O3]

期数:
2012年4期
页码:
291-297
栏目:
纳米技术
出版日期:
2012-07-15

文章信息/Info

Title:
 Investigation of Technology, Properties and Mechanism for Direct Current Electrodeposition Nanocrystalline Fe-Ni-Cr Alloy Foil
作者:
 邓姝皓12 刘晗12 郭洁1 叶晓慧1
 (1. 中南大学材料科学与工程学院,长沙410083; 2. 中南大学有色金属教育部重点实验室,长沙410083)
Author(s):
 DENG Shuhao12 LIU Han12 GUO Jie1 YE Xiaohui1
 (1. School of Materials Science and Engineering, Central South University, Changsha 410083, China; 2. The Key Laboratory of Nonferrous Metal of Ministry of Education, Central South University, Changsha 410083, China)
关键词:
 直流电沉积 纳米晶 Fe-Ni-Cr合金箔 机理
Keywords:
 direct current electrodeposition nanocrystallineFe-Ni-Cr alloy foil mechanism
分类号:
-
DOI:
-
文献标识码:
A
摘要:
 在含三价铬的水溶液中,以氨基乙酸(gly)为配位剂,直流电沉积制备出Fe鄄Ni鄄Cr合金箔,研究了电流密度、铬盐浓度对合金箔成分的影响;采用扫描电子显微镜和X射线衍射对合金箔进行表征,并对合金箔的各项性能进行了研究;采用电化学方法对铬电沉积机理进行初探. 确定直流电沉积Fe-Ni-Cr合金箔的最佳工艺条件为:电流密度为15A/dm2,铬盐质量浓度为50 g/L,温度为60 ℃,pH值为1.5. 在此条件下可获得厚度为20~30 μm光亮、无裂纹的合金箔,其中Cr、Fe和Ni的质量分数分别为4%~6%、60%~65%、30%~35%. 合金箔微观形貌为紧密堆砌的不规则板块状小晶粒;合金箔为纳米晶结构,晶粒尺寸在纳米范围内,主相是Cr与α-Fe或γ-Fe形成的间隙固溶体;合金箔中Cr含量提高,硬度、电阻及耐蚀性均随之提高. 通过理论计算gly鄄Cr3+还原沉积的标准活化能为35.6 kJ/mol,该过程由电子转移步骤控制.
Abstract:
 Fe-Ni-Cr alloy foils were electrodeposited from the trivalent chromium bath containing glycine as complexing agent. The effects of electrodeposition current density and concentration of trivalent chromium on composition of alloy foil were investigated. The Fe-Ni-Cr alloy foil was characterized by means of SEM(scanning electron microscopy), EDS(energy dispersive spectraneter) and XRD(X-ray diffraction). The properties of alloy foil and the mechanism of trivalent chromium reduction were also studied. The optimal process conditions are followed as that: 50 g/L CrCl3·6H2O, with 15 A/dm2 current density, at 60 ℃ in the solution of pH value 1.5. Fe-Ni-Cr alloy foil with the thickness of 20—30 μm was obtained with a smooth and uniform appearance, which contains 4%—6%(mass fraction)Cr, 60%—65%Fe and 30%—35%Ni. The results indicated the alloy foil piled up compactly with irregular plate grain and its grain size was less than 100 nm; and the main phases were the α-Fe or γ-Fe interstitial solid solution with Cr. The higher content of Cr in alloy foil, the higher electrical resistance, micro-hardness and anti-corrosion resistance for alloy foil. Furthermore, the activation energy of electrodeposition Cr was calculated about 35.6 kJ/mol by means of polarization curve, which demonstrates the rate controlled step is charge transfer process.

参考文献/References

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备注/Memo

备注/Memo:
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更新日期/Last Update: 2012-11-14