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Study on the corrosion properties of nanocrystalline nickel electrodepositied by reverse pulse current

机译：反向脉冲电流电沉积纳米晶镍的腐蚀性能研究

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摘要

Nanocrystalline nickel coatings were produced by the method of reverse pulse electrodepositing on the surface of steel sheets. The crystallite size of nanocrystalline nickel coatings was determined by X-ray diffraction (XRD). The effect of saccharin concentration on the crystallite size of the coatings was studied. The average crystallite sizes were diminished as a result of increasing saccharin concentration. CHI660C electrochemical workstation was used to determine the Tafel polarization curves and electrochemical impedance spectroscopy (EIS) of the coatings. The value of corrosion potential, natural corrosion current density, polarizaiton resistance and impedance was calculated, the results suggested that smaller grain size led to higher polarization resistance. EIS gave the charge transfer resistance R_(ct) and pore resistance R_(po) variation trend from beginning to 30 min. Scanning electron microscopy (SEM) examination showed the surface morphology of the nickel coatings after the neutral salt spray (NSS) test or bathing in 10% HCl. The images indicated that the corrosion behavior of nanocrystalline nickel coatings was pitting corrosion, the mechanism was also discussed.
机译：通过反向脉冲电沉积在钢板表面上的方法制备了纳米晶镍涂层。纳米晶镍涂层的微​​晶尺寸通过X射线衍射（XRD）确定。研究了糖精浓度对涂层微晶尺寸的影响。由于糖精浓度的增加，平均微晶尺寸减小了。使用CHI660C电化学工作站确定涂层的Tafel极化曲线和电化学阻抗谱（EIS）。计算了腐蚀电位，自然腐蚀电流密度，极化电阻和阻抗值，结果表明较小的晶粒尺寸导致较高的极化电阻。 EIS给出了从开始到30分钟的电荷转移阻力R_（ct）和孔阻力R_（po）的变化趋势。扫描电子显微镜（SEM）检查显示在中性盐雾（NSS）测试或在10％HCl中浸泡后，镍涂层的表面形态。图像表明纳米晶镍涂层的腐蚀行为是点蚀，并讨论了其机理。

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  • 来源
    《Applied Surface Science》 |2013年第1期|604-608|共5页
  • 作者

    Wen Cheng; Wen Ge; Qjan Yang; Xinxin Qu;

  • 作者单位

    Faculty of Materials and Chemistry, China University of Geosciences (Wuhan), Wuhan 430074, China;

    Faculty of Materials and Chemistry, China University of Geosciences (Wuhan), Wuhan 430074, China;

    Faculty of Materials and Chemistry, China University of Geosciences (Wuhan), Wuhan 430074, China;

    Faculty of Materials and Chemistry, China University of Geosciences (Wuhan), Wuhan 430074, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Reverse pulse current; Nanocrystalline nickel; Pitting corrosion;

    机译：反向脉冲电流;纳米晶镍;点腐蚀;

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