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双向脉冲参数对金铸层的形貌和结构影响
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中国地质大学武汉,中国地质大学武汉,中国地质大学武汉,中国地质大学武汉

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Influence of pulse parameters on the morphology and microstructure of gold electrodeposits
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China University of Geosciences Wuhan,China University of Geosciences Wuhan,China University of Geosciences Wuhan,China University of Geosciences Wuhan

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    摘要:

    本文采用双脉冲电沉积技术,控制单一变量,在酸性的无氰氯金酸溶液进行金的电沉积。采用扫描电子显微镜、X 射线衍射仪研究了脉冲电流密度和占空比对金铸层表面和横截面形貌,及显微结构的影响。实验结果表明正向峰值电流密度从2.25 A/dm2增加到3.75A/dm2,铸层晶粒细化,但正向电流密度过大导致表面起伏较大,铸层平整度下降;而反向峰值电流密度从6 A/dm2增加到12A/dm2时,晶粒尺寸逐渐变大,结构也变得疏松。正向占空比由20%提高到60%,会使阴极过电位增大,从而铸层晶粒细化,但是正向占空比过大会造成铸层内部出现孔隙,致密度下降;反向占空比从10%提高到40%,铸层针孔逐渐增多,变得薄脆。通过计算织构系数,可知在较高的阴极过电位下,金铸层的择优取向沿(111)和(222)晶面;低的阴极过电位下,金铸层的择优取向则沿(200)晶面。

    Abstract:

    Thick gold material was fabricated in cyanide-free chloroauric acid solution by bipolar pulse reverse technique, influence of forward and reverse current density and duty cycle on the morphology and microstructure of gold deposits were studied and discussed. Results showed that when forward current density increased from 2.25 A/dm2 to 3.75A/ dm2, grain sizes became smaller and gold particles stacked more compact, but overhigh forward current density lead to surface fluctuation and decreasing of gold deposits flatness; While when reverse current density increased from 6 A/ dm2 to 12A/ dm2, grains became larger and structure loosen. Cathodic overpotential would increase when forward duty cycle increased from 20% to 60%, thus refining the gold deposits,grain sizes became smaller, but cracks would appear if forward duty cycle increased too much; While pores appear and deposits grew thinner and became crisp gradually when reverse duty cycle increased from 10% to 40%. By calculating the texture coefficient, gold deposits showed a preferred orientation along (111) and (222) plain under higher cathodic overpotential; while(200)plain was preferred under lower cathodic overpotential.

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雷婷,袁心强,王成博,郑利珊.双向脉冲参数对金铸层的形貌和结构影响[J].稀有金属材料与工程,2016,45(5):1257~1263.[Lei Ting, Yuan Xinqiang, Wang Chengbo, Zheng Lishan. Influence of pulse parameters on the morphology and microstructure of gold electrodeposits[J]. Rare Metal Materials and Engineering,2016,45(5):1257~1263.]
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  • 收稿日期:2015-06-16
  • 最后修改日期:2015-08-07
  • 录用日期:2015-11-18
  • 在线发布日期: 2016-06-02
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