三价铬镀液中电沉积纳米晶体Fe-Ni-Cr合金箔  

Electrodeposition of nanocrystalline Fe-Ni-Cr alloy foil in trivalent chromium bath

作　　者：杨余芳[1] 龚竹青[1] 邓丽元[2] 阳征会[1] 马玉天[1] 

机构地区：[1]中南大学冶金科学工程学院,湖南长沙410083 [2]中南大学化学化工学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2006年第3期509-515,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(59674025)

摘　　要：在氯化物-硫酸盐镀液体系中，以柠檬酸为络合剂，通过电沉积的方法获得厚度约为30μm的Fe-Ni-Cr合金箔。研究了电流密度、温度、pH值以及镀液中三氯化铬和柠檬酸含量对Fe-Ni-Cr合金箔成分的影响。确定了最佳工艺条件，即电流密度为10-20A／dm^2，pH值为1．60～2．70，温度为20-30℃。采用能量损失谱测定镀层成分，采用X射线衍射和扫描电镜分别测定镀层的晶体结构和表面形貌。研究结果表明，电沉积得到的合金箔成分为31．13％～54．24％Fe，44．64％～65．36％Ni，1．11％～3．52％Cr，镀层表面光亮平滑，抗拉强度为900．2～996．0MPa，电阻率为61．3～95．4μΩ·cm；Fe-Ni-Cr合金箔的晶粒尺寸小于10nm，为纳米晶体结构，具有良好的韧性和耐腐蚀性。Using citric acid as a complexing agent, Fe-Ni-Cr alloy foils were obtained with thickness of about 30μm by means of electrodeposition in the chloride-sulfate electrolyte system. The effects of current density, temperature, pH value, the concentration of chromic chloride hexahydrate and citric acid on the compositions of Fe-Ni-Cr alloy foils were investigated. The optimal process for depositing Fe-Ni-Cr alloy foil was obtained as follows： current density 10 -20 A/dm^2, pH value： 1.60 -2.70, and temperature 20 -30 22. The compositions of the deposits were measured by means of energy-dispersive X-ray spectroscope. The crystallographic structure and the morphology of the deposits were obtained by X-ray diffractometry patterns and scanning electron microscopic photographs, respectively. The results show that the alloy foils are bright and smooth with the composition of 31. 13%- 54. 24% Fe, 44. 64%-65. 36% Ni and 1. 11%-3.52%Cr. The tensile strength is 900.2 - 996.0 MPa and the resistivity is 61.3 - 95.4μΩ· cm. The grain size of Fe-Ni-Cr alloy foil is less than 10 nm, which indicates the foil is nanocrystalline. The Fe-Ni-Cr alloy foil has super toughness and corrosion resistance.

关 键 词：三价铬 Fe-Ni-Cr合金箔 电沉积 纳米晶体 

分 类 号：TQ153.2[化学工程—电化学工业]