Effect of anodic treatment on the composition and structure of electrodeposited Zn–Cr alloy coatings
Effect of anodic treatment on the composition and structure of electrodeposited Zn–Cr alloy coatings
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阳极处理对电沉积Zn-Cr合金镀层成分和结构的影响
DOI：
10.1016/s0010-938x(03)00178-1
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发表时间：
2004
影响因子：
8.3
通讯作者：
M. Monev
中科院分区：
文献类型：
--
作者：
Tz. Boiadjieva;D. Kovacheva;K. Petrov;S. Hardcastle;M. Monev
本文研究了锌铬合金镀层的阳极行为，锌铬含量为14-28 at.%用电化学方法研究了Cr在1 M Na 2SO 4溶液中的电化学行为。用EDX、XRD、XPS和SEM等方法研究了阳极处理引起的成分和结构的变化。与合金中的初始Cr含量无关，η-Zn相和贫Cr bcc Γ-（Zn，Cr）相在比Zn更正的电位下溶解。在接近于Cr的反式被动溶解的电势的电势下建立了Γ-（Zn，Cr）相的进一步溶解。薄的r-（Zn，Cr）层，含有约40原子%的在达到析氧电位后，Cr的残余物被机械分解。
The anodic behaviour of Zn–Cr alloy coatings, containing 14–28 at.% of Cr is investigated in 1 M Na2SO4solution using electrochemical methods. The alterations of the composition and structure caused by anodic treatment, are examined by means of EDX, XRD, XPS and SEM. Independently of the initial Cr content in the alloys the η-Zn phase and depleted of Cr bcc Γ-(Zn,Cr) phase are dissolving at potentials more positive than that of Zn. Further dissolution of the Γ-(Zn,Cr) phase is established at a potential close to the potential of trans-passive dissolution of Cr. A thin Γ-(Zn,Cr) layer, containing about 40 at.% of Cr, remains and is mechanically disintegrated after the potential of oxygen evolution is reached.