高铁Fe-Ni合金箔的电沉积制备工艺

Electrodeposition of Fe-Ni Alloy Foil with High Iron Content

采用电沉积方法在硫酸盐-氯化物体系制备高铁Fe-Ni合金箔。研究了镀液温度、pH值、搅拌速度、添加剂YYD浓度、电流密度、NiSO4.6H2O浓度、FeSO4.7H2O浓度对合金箔中铁含量的影响,确定了适宜的工艺条件。采用XRD、阴极极化曲线、AFM和维氏硬度对不同铁含量箔的结构、形貌、硬度进行了表征。结果表明,在适宜的工艺条件下所得合金箔光亮平整,晶粒粗糙度约为50nm,Fe含量为63.50%,符合因瓦合金的组成。铁含量对结构和硬度影响大,当铁含量由55.06%升高到63.50%时,合金箔由面心立方Fe3Ni2转变为面心立方Fe3Ni2和体心立方Fe7Ni3的混合结构;当铁含量由52%升高到63.50%时,硬度降低了125HV。阴极极化曲线表明,添加剂YYD是铁的去极化剂,同时也是Fe-Ni合金的极化剂,可减少合金箔的应力。

A Fe-Ni alloy foil was prepared in a sulfate-chloride bath by electrodeposition. The influences of process parameters, such as bath temperature, pH value, stirring rate, agent YYD concentration, current density, Ni- SO4 . 6H20 concentration, FeSO4 .7H20 concentration on the iron content in the foil were studied. The optimal process parameters were obtained. The structure, morphology and hardness were characterized by X-ray diffraction, AFM and hardness measurements. The results show that the foil is bright and uniform. The roughness is 50nm and iron content is 63.50%, which meets the composition requirement of invar alloy. The iron content has great effects on structure and hardness. When iron content increases from 55.06% to 63. 50%, the structure converts from fcc Fea Ni2 to a mixture of fcc Fea Ni2 and bcc Fe7 Nia. The hardness decreases 125HV with increasing iron content from 52.0% to 63. 500%. Cathodic polarization curves show that the agent YYD is depolarizer of iron and polarizer of Fe-Ni alloy, and could reduce the stress of the alloy.