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首页> 外文期刊>Corrosion Engineering, Science and Technology >Electrochemical study on corrosion behaviour of zircaloy-2 in aqueous medium containing permanganate ion
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Electrochemical study on corrosion behaviour of zircaloy-2 in aqueous medium containing permanganate ion

机译:Zircaloy-2在高锰酸根离子水介质中腐蚀行为的电化学研究

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摘要

The corrosion compatibility of zircaloy-2 was studied in strong oxidising permanganate based acidic (HMnO_4) medium using impedance spectroscopy and potentiodynamic anodic polarisation methods at room temperature (28℃) and elevated temperatures (65 and 90℃). The average corrosion rate of zircaloy-2 in HMnO_4 medium (0·417-8·33 mM) was found to be 1·32 × 10~(-4) μm h~(-1) at 28℃, 2·59 × 10~(-4) μm h~(-1) at 65℃ and 3·53 × 10~(-4) μm h~(-1) at 90℃. At 28℃, the polarisation resistance R_p values obtained from impedance spectrum were higher (in kΩ) when compared to R_p values at 65 and 90℃, indicating a lower corrosion rate at lower temperature. Comparative studies with 2·5 mM H_2SO_4 and platinum (as a working electrode) showed the effects of oxidising nature and participation of additional redox reactions in HMnO_4 medium. Cyclic polarisation studies showed the absence of pitting attack on zircaloy-2.
机译:在室温(28℃)和高温(65℃和90℃)下,采用阻抗谱和电位动力学阳极极化方法,研究了Zircaloy-2在强氧化高锰酸盐基酸性(HMnO_4)介质中的腐蚀相容性。在28℃,2·59×下,在HMnO_4介质(0·417-8·33 mM)中Zircaloy-2的平均腐蚀速率为1·32×10〜(-4)μmh〜(-1)。 65℃时为10〜(-4)μmh〜(-1),90℃时为3·53×10〜(-4)μmh〜(-1)。在28℃时,与在65℃和90℃时的R_p值相比,从阻抗谱获得的极化电阻R_p值较高(以kΩ为单位),表明较低温度下的腐蚀速率较低。与2·5 mM H_2SO_4和铂(作为工作电极)的比较研究表明,氧化性质的影响以及HMnO_4介质中其他氧化还原反应的参与。循环极化研究表明没有对Zircaloy-2产生点蚀。

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