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Formation mechanism of amorphous Ni-Fe-P alloys by electrodeposition 被引量:5

Formation mechanism of amorphous Ni-Fe-P alloys by electrodeposition
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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.
作者 高诚辉
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
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