Complexation Behavior and Co-Electrodeposition Mechanism of Au-Sn Alloy in Highly Stable Non-Cyanide Bath
Complexation Behavior and Co-Electrodeposition Mechanism of Au-Sn Alloy in Highly Stable Non-Cyanide Bath
复制标题
高稳定无氰镀液中Au-Sn合金的络合行为及共电沉积机理
DOI：
10.1149/2.0721803jes
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发表时间：
2018-01-01
影响因子：
3.9
通讯作者：
Huang, M. L.
中科院分区：
文献类型：
--
作者：
Huang, F. F.;Huang, M. L.
The complexation behavior and co-electrodeposition mechanism of Au-Sn alloy in a highly stable non-cyanide bath were studied by electrochemicalanalysisandquantumchemicalcalculationbasedondensityfunctionaltheory(DFT).Theinteractionsbetweenmetal ionsandmultiplecomplexingagentswererevealed,andthemechanismonthehighstabilityoftheAu-Snbathwasclarified.Thecomplexingagentspotassiumpyrophosphate(K 4 P 2 O 7 )andethylenediaminetetraaceticacid(EDTA)haveasynergeticcomplexation to Sn ions, which exist in one valence state of Sn 2 + to form three complex ions, i.e., [Sn(P 2 O 7 )] 2 − , [Sn(P 2 O 7 ) 2 ] 6 − and Sn-EDTA; while the complexing agents of 5,5-dimethylhydantoin (DMH) and sodium sulfite (Na 2 SO 3 ) have a complexation to Au ions, which exist in two different valence states (i.e., Au 3 + and Au + ) to form two complex ions of [Au(DMH) 4 ] − and Au[(SO 3 ) 2 ] 3 − . Moreover, the existence of [Au(DMH) 4 ] − inhibits the decomposition of [Au(SO 3 ) 2 ] 3 − . Meanwhile, EDTA participates in some form of coordination with Au + , inhibites the decomposition of [Au(SO 3 ) 2 ] 3 − and facilitates the reduction of [Au(SO 3 ) 2 ] 3 − . The co-electrodeposition of Au-Sn alloy is a diffusion-controlled process, and the nucleation of Au-Sn alloy is a progressive nucleation process. The antioxidant catechol significantly increases the overpotential of Au-Sn co-electrodeposition and improves the brightness of electrodeposited films of Au-Sn alloys
