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首页> 外文期刊>Applied Surface Science >Electrochemical properties of the passive film on bulk Zr-Fe-Cr intermetallic fabricated by spark plasma sintering
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Electrochemical properties of the passive film on bulk Zr-Fe-Cr intermetallic fabricated by spark plasma sintering

机译：火花等离子体烧结制备的块状Zr-Fe-Cr金属间化合物钝化膜的电化学性能

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摘要

Although Zr-based second phase particles (SPPs) are important factors influencing corrosion resistance of zircaloy cladding materials, the corrosion behavior of SPPs has not been investigated by means of electrochemical method so far. In order to clarify the role of SPPs commonly existed in zircaloy, bulk Zr-based intermetallics were firstly fabricated by spark plasma sintering (SPS) at temperatures 1373 K and an applied pressure of 60 MPa in this work. Both the natural passive film on surface and oxidation behavior of intermetallic has been investigated in this work. X-ray diffraction (XRD) pattern showed that as -prepared intermetallic of crystal structure belongs to Laves phase with AB(2) type. Electrochemical measurement of passive film on surface of bulk Zr-based intermetallic exhibited significant difference with that of zirconium. Potentiodynamic measurements results revealed that intermetallic exhibited higher corrosion potential and lower corrosion current density than that of pure zirconium, implying that Zr-based second phase will act as cathode when they are included in zirconium matrix. Meanwhile, significant improvement of Zr-Fe-Cr intermetallic on the water chemistry corrosion resistance was demonstrated comparing with Zr-Fe and Zr-Cr binary intermetallics. (C) 2016 Elsevier B.V. All rights reserved.
机译：尽管基于Zr的第二相颗粒（SPPs）是影响锆合金熔覆材料耐蚀性的重要因素，但到目前为止，尚未通过电化学方法研究SPPs的腐蚀行为。为了阐明在锆合金中通常存在的SPP的作用，在这项工作中，首先通过火花等离子体烧结（SPS）在1373 K的温度和60 MPa的施加压力下制造了块状Zr基金属间化合物。在这项工作中，已经研究了表面上的自然钝化膜和金属间化合物的氧化行为。 X射线衍射（XRD）图谱表明，所制备的晶体结构的金属间化合物属于AB（2）型的Laves相。块状Zr基金属间化合物表面的钝化膜的电化学测量与锆有显着差异。电位动力学测试结果表明，金属间化合物比纯锆具有更高的腐蚀电势和更低的腐蚀电流密度，这意味着当锆基中包含Zr基第二相时，它们将充当阴极。同时，与Zr-Fe和Zr-Cr二元金属间化合物相比，Zr-Fe-Cr金属间化合物在水化学腐蚀方面具有显着改善。 （C）2016 Elsevier B.V.保留所有权利。

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