Sm_2Fe_(17)是一种性能优异的永磁材料(SmFeN)的前驱体.用循环伏安法研究了三价钐(Sm(Ⅲ))和二价铁(Fe(Ⅱ))在含甘氨酸的水溶液中的电化学行为,在Pt电极上,Fe(Ⅱ)一步还原为Fe,sm(Ⅲ)能被Fe(Ⅱ)诱导共沉积.在水溶液中成功电沉积出Sm-Fe合金.研究了pH和电流密度对镀层组分的影响,在电流密度为40 mA·cm~(-2)时,随着pH升高,镀层中Sm含量增加,在pH=4.5时,随着电流密度的增加,镀层中Sm含量增加.电子显微镜(SEM)显示镀层表面是紧密一致的.镀层在热处理前是非晶态Sm-Fe合金和微晶Fe的混合相,经750℃热处理后,镀层转化为Fe和Sm-Fe合金的混合相.
Sm_2Fe_(17)was the precursor of a kind of excellent magnetic permanent material(Sm FeN).Cyclic voltammetry Was used to in vestigate the electrochemical behavior of trivalent samarium(Sm(Ⅲ))and bivalent iron(Fe(Ⅱ))in aqueous containing glycine. Fe (Ⅱ)was reduced to Fe in one step on Pt electrode; Sm(Ⅲ)could be inductively codeposited with Fe(Ⅱ).Effect of pH and current density on the composition of the pated alloys was studied.When current density was 40mA·cm_(-2),the Sm content in the deposits increased with increasing pH value.With current densety increased at pH=4.5,the Sm content in the deposits increased too.Scanning electron microscopy(SEM) observation showed that the surfaces of Sm-Fe alloy films were uniform and compact.The deposits were the mixed phase of amorphous Sm-Fe alloy and crystalline Fe before heat treatment;and the deposits were converted to mixed phade of Fe and Sm-Fe.
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