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本文报道用XPS和AES研究羟基乙叉二膦酸(HEDP)体系电镀Sn-Co合金镀层(Sn 44原子%,CO56原子%)在空气中自然形成的表面氧化膜的组成和厚度.根据研究结果,认为表面氧化膜可能是Co(OH)_2和SnO_2·xH_2O形成的水合复合氧化物.表面氧化膜厚度,根据实验数据近似计算,约为4.7~10A,表明氧化膜只有几个原子层厚度.另外.清除氧化膜后合金表层Sn/Co相对原子浓度比(~31/68)低于体相Sn/Co原子浓度比(~44/56).说明氩离子溅射后台金表层是Co富集的.
In this paper, the composition and thickness of naturally formed surface oxide film in air of Sn-Co alloy plating (Sn 44 atomic%, CO56 atomic%) of hydroxyethylidenediphosphonic acid (HEDP) system were studied by XPS and AES. , Suggesting that the surface oxide film may be a hydrated composite oxide formed by Co (OH) 2 and SnO 2 · xH 2 O. The thickness of the surface oxide film is calculated approximately from 4.7 to 10 A according to the experimental data, indicating that the oxide film has only a few atomic layer thicknesses. In addition, the Sn / Co relative atomic concentration ratio (~ 31/68) is lower than the bulk Sn / Co atomic ratio (~ 44/56) after the oxide film is removed. of.