The corrosion behaviour of nickel in molten NaNO3KNO3 eutectic

A. Baraka, R.M.S. Baraka, A. Abdel-Razik
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引用次数: 6

Abstract

The corrosion (oxidation) of nickel in molten (Na, K)NO3 eutectic has been investigated at temperatures ranging from 250 °C to 450 °C, for exposure periods of up to 12 h. The results of both weight-gain and potential measurements under open-circuit conditions reveal the formation of a passivating film consisting mainly of NiO. The thickening of the oxide film proceeds according to a parabolic law, at a rate depending on the temperature of the melt. The activation energy of the process was estimated to be 14.95 kcal mol−1, indicating that the oxidation process of nickel is determined by diffusion of nickel in the form of ions and electrons via vacancies and holes. A break was observed in the parabolic plots at higher temperatures; this may indicate a change in the mechanism of film growth. The results are discussed in terms of oxidation kinetics data for nickel in both molten nitrates and air at high temperatures.

镍在熔融NaNO3KNO3共晶中的腐蚀行为
研究了镍在熔融(Na, K)NO3共晶中在250°C至450°C的温度范围内的腐蚀(氧化),暴露时间长达12小时。开路条件下的重量增加和电位测量结果显示,形成了一层主要由NiO组成的钝化膜。氧化膜的增厚按照抛物线规律进行,其速度取决于熔体的温度。该过程的活化能估计为14.95 kcal mol−1,表明镍的氧化过程是由镍通过空位和空穴以离子和电子的形式扩散决定的。在较高的温度下,抛物线图出现了断裂;这可能表明薄膜生长机制发生了变化。根据镍在熔融硝酸盐和高温空气中的氧化动力学数据对结果进行了讨论。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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