Electrochemical nucleation and growth of Sn onto double reduction steel substrate from a stannous fluoborate acid bath
Electrochemical nucleation and growth of Sn onto double reduction steel substrate from a stannous fluoborate acid bath
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氟硼酸亚锡酸浴中锡在双还原钢基体上的电化学成核和生长
DOI：
10.1016/j.jelechem.2013.09.012
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发表时间：
2013-11-15
影响因子：
4.5
通讯作者：
Zhang, Jianqing
中科院分区：
文献类型：
--
作者：
Huang, Xianqiu;Chen, Yu;Zhang, Jianqing
循环伏安法（CV）、计时电流法（CHR）与扫描电子显微镜（SEM）技术相结合，研究了氟硼酸亚锡酸浴中锡在双还原钢基材上的电沉积行为。结果表明，在实验条件下，锡的初始还原过程受扩散控制，并遵循三维（3D）成核和随后的晶粒长大机制。随着施加的阴极过电位的增加，锡的成核类型从渐进机制转变为瞬时机制。当沉积过电势较高时，电极表面在短时间内被锡沉积物完全覆盖，电流-时间瞬变由锡成核电流和锡生长中心质子还原引起的电流组成，而在低沉积过电势时也应考虑钢表面质子还原引起的电流。结果还表明，锡成核和质子还原速率常数都随着阴极过电位的增加而增加，并且钢基体表面的质子还原速率常数大于锡生长中心的质子还原速率常数。发现锡物质的扩散系数为1.24E-5 cm(2) s(-1)。 (C) 2013 Elsevier B.V. 保留所有权利。
Cyclic voltammetry (CV), chronoamperometry (CHR) in conjunction with scanning electron microscopy (SEM) technique have been performed to study the electrodeposition behavior of tin onto double reduction steel substrate from a stannous fluoborate acid bath. Results show that, under the experimental conditions, the initial reduction process of tin is controlled by diffusion and follows the three-dimensional (3D) nucleation and subsequent grain growth mechanism. With the increase of the applied cathodic overpotentials, the nucleation type of tin changes from progressive mechanism to instantaneous mechanism. When the deposition overpotential is high, the electrode surface is fully covered with tin deposits in short times that the current-time transient is composed of the tin nucleation current and the current attributed to proton reduction on the tin growth centers while the current due to proton reduction on the steel surface should be considered as well at low deposition overpotentials. Results also reveal that both the tin nucleation and proton reduction rate constant increase with increasing the cathodic overpotentials, and the proton reduction rate constant on the steel substrate surface is larger than that on the tin growth centers. The diffusion coefficient of tin species is found to be 1.24E-5 cm(2) s(-1). (C) 2013 Elsevier B.V. All rights reserved.