穆斯堡尔谱研究电镀镍铁合金层

用穆斯堡尔谱研究了电镀镍铁合金层的形成过程,镀液中Al~(3 ),Mn~(2 ),Cr~(3 ),Zn~(2 )及Cu~(2 )等离子的存在对镀层组成、织构等的影响以及不同铬处理后镍铁镀层的织构和耐蚀性;分析了铬、锰等元素在其中所起的作用;并初步探讨了形成层状结构的原因.

A study of electrodeposited nife alloy by mossbauer spectroscopy

The formation process of electrodeposited NiFe alloy, the influence of cationic impurities Al3+, Mn2+, Cr3+, Zn3+ and Cu3+ in the bath on the composition and texture of plating layers and the texture and corrosion resistance of electrodeposited NiFe alloy at various ways of chromium treatment were investigated by Mossbauer spectroscopy. The results obtained are as follows: (1) Under normal operating conditions, only a single γ-NiFe phase plating layer was found in the process of Ni75Fe25 electroplating. (2) The formation of the lamellar microstructure is a consequence of the periodic incorporation of minor amount of organic additives with NiFe alloy in the plating layer. (3) As the concentration of cationic impurites Al, Cr, Mn, Zn and Cu presented in the bath exceeds 10-2M, it is found that the grain size of the plating layer increases and the crystal shows preferential orientation. Some cationic impurities may cause local environmental effect and change the angle between the direction of a magnetic field and the direction of the emitted γ-ray. (4) In order to improve the corrosion resistance of electrodeposited NiFe alloys, a NiFe/conventional chromium plating is preferable to a NiFe/microporous chromium plating.