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首页> 外文期刊>Journal of power sources >Effects of cell size and macrosegregation on the corrosion behavior of a dilute Pb-Sb alloy
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Effects of cell size and macrosegregation on the corrosion behavior of a dilute Pb-Sb alloy

机译：晶胞大小和宏观偏析对稀Pb-Sb合金腐蚀行为的影响

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摘要

The aim of this study was to examine the effect of cooling rate on the cellular growth of a Pb-0.85 wt percent Sb alloy and to evaluate the influences of cell size and of the corresponding macrosegregation profile on the resultant corrosion behavior. In order to obtain the as-cast samples a water-cooled unidirectional solidification system was used. Such experimental set-up has permitted the development of a clear cellular structural array even for relative high cooling rates and has allowed a wide range of solidification conditions to be analyzed. Macrostructural and microstractural aspects along the casting were characterized by optical microscopy and scanning electron microscope (SEM) techniques. The electrochemical impedance spectroscopy technique and potentiodynamic curves (Tafel extrapolation) were used to analyze the corrosion resistance of samples collected along the casting length and immersed in a 0.5 M H_2SO_4 solution at 25 deg C. It was found that the corrosion rate decreases with increasing cell spacing and that the pre-programming of microstracture cell size can be used as an alternative way to produce as-cast components of Pb-Sb alloys, such as battery grids, with better corrosion resistance.
机译：这项研究的目的是检查冷却速率对Pb-0.85 wt％Sb合金的孔道生长的影响，并评估孔道尺寸和相应的宏观偏析轮廓对所得腐蚀行为的影响。为了获得铸态样品，使用了水冷单向凝固系统。即使相对较高的冷却速率，这种实验设置也允许开发出清晰的蜂窝结构阵列，并允许分析各种固化条件。利用光学显微镜和扫描电子显微镜（SEM）技术对铸件的宏观和微观结构进行了表征。用电化学阻抗谱技术和电位动力学曲线（Tafel外推法）分析沿铸件长度收集并浸入25°C的0.5 M H_2SO_4溶液中的样品的耐蚀性。发现腐蚀速率随电池数量的增加而降低间距以及微结构单元尺寸的预编程可以用作生产Pb-Sb合金铸态组分（例如电池栅）的替代方法，并具有更好的耐腐蚀性。

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