Effect of pH on High-temperature Electrochemical Corrosion Behavior of AlCrNbSiTi High Entropy Alloy Coatings on Zr-Sn-Nb Alloy
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摘要: 为了提高压水堆Zr-Sn-Nb合金包壳材料的耐腐蚀性，本文使用电弧离子镀法在Zr-Sn-Nb合金基底上制备了AlCrNbSiTi高熵合金涂层，并分别在3种不同pH的水环境中进行了开路电位和动电位极化电化学的测量，通过微观表征分析了表面氧化膜的形貌、化学成分和结构，研究了pH值变化对AlCrNbSiTi高熵合金涂层高温电化学行为的影响。研究结果表明，随着pH值（7.4~8.5）的增加，涂层的开路电位下降，极化曲线的腐蚀电流密度增加，涂层表面腐蚀程度加剧。因此，AlCrNbSiTi高熵合金涂层的耐腐蚀性随着pH值（7.4~8.5）的增加而下降。Abstract: In order to improve the corrosion resistance of Zr-Sn-Nb alloy cladding material in PWR, the AlCrNbSiTi high entropy alloy coatings were prepared on Zr-Sn-Nb alloy substrates by arc ion plating, and the open-circuit potential and potentiodynamic polarization electrochemistry were measured in three different pH water environments. The morphology, chemical composition and structure of the surface oxide film were analyzed by microscopic characterization, and the influence of pH change on the high-temperature electrochemical behavior of AlCrNbSiTi high entropy alloy coating was studied. The results show that with the increase of pH (7.4-8.5), the open circuit potential of the coating decreases, the corrosion current density of polarization curve increases and the corrosion degree of the coating surface intensifies. Therefore, the corrosion resistance of AlCrNbSiTi high entropy alloy coating decreases with the increase of pH(7.4~8.5).
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图 1 高熵合金涂层在不同pH条件下的开路电位
Figure 1. Open-circuit Potential of High Entropy Alloy Coating under Different pH Conditions
图 2 高熵合金涂层在不同pH条件下的极化曲线
Figure 2. Polarization Curves of High Entropy Alloy Coating under Different pH Conditions
图 4 高倍下试样表面腐蚀形貌SEM图像
Figure 4. SEM Images of Surface Corrosion Morphology at High Magnification
图 6 试样HEA-1截面氧化膜的能谱线扫分析结果
Figure 6. Energy Spectrum Analysis of Oxide Film on HEA-1 Section
图 7 试样HEA-3表面析出颗粒的能谱面扫分析结果
Figure 7. Mapping Result of Precipitated Particles on HEA-3 Surface
图 8 试样HEA-3表面析出颗粒的选区电子衍射（SAED）衍射图像
Figure 8. SAED Diffraction Pattern of Particles Precipitated on the Surface of HEA-3
图 9 试样HEA-3表面氧化膜的SAED衍射图像与分析
Figure 9. SAED Diffraction Pattern of Oxide Film on HEA-3
表 1 AlCrNbSiTi高熵合金涂层化学成分
Table 1. Chemical Composition of AlCrNbSiTi High Entropy Alloy Coating
元素 Al Cr Nb Si Ti 质量分数/% 8 49 12 12 19 
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