摘要
The formation mechanism of the amorphous Ni-Fe-P coating was studied by analysis of the forming thermodynamics, dynamics, and crystallography of the amorphous alloy. The results show that, in the initial stage of deposition a thin 'crystal epitaxial growth' layer first forms, and then transforms to amorphous gradually. The cross section in Ni-Fe-P coatings by electrolytic etching exhibits a banded structure of alternate dark and light bands. It is proposed that the banded structure is caused by a change in the P content with thickness,which is due to alternated depletion and enrichment of [OH-] in the diffusion layer resulting from the generation and evolution of hydrogen gas. The amorphous Ni-Fe-P coating will be formed in proper composition, high nucleation rate and strongly hindered growth of the crystal nucleus. Amorphous Ni-Fe-P alloys form as islands, and grow up by layer.
The formation mechanism of the amorphous Ni-Fe-P coating was studied by analysis of the forming ~thermodynamics, dynamics, and crystallography of the amorphous alloy. The results show that, in the initial ~stage of deposition a thin “crystal epitaxial growth” layer first forms, and then transforms to amorphous ~gradually. The cross section in Ni-Fe-P coatings by electrolytic etching exhibits a banded structure of alternate dark and light bands. It is proposed that the banded structure is caused by a change in the P content with thickness, which is due to ~alternated depletion and enrichment of [OH-] in the diffusion layer resulting from the generation and evolution of hydrogen gas. The amorphous Ni-Fe-P coating will be formed in proper composition, high nucleation rate and strongly hindered growth of the crystal nucleus. Amorphous Ni-Fe-P alloys form as islands, and grow up by layer.
出处
《中国有色金属学会会刊:英文版》
CSCD
2005年第3期504-509,共6页
Transactions of Nonferrous Metals Society of China
关键词
镍-铁-磷镀膜
非晶态合金
结构性质
电沉积
Ni-Fe-P Coating
amorphous alloy
formation mechanism
electrodeposition