扫描电子显微镜
介电谱
溶解
材料科学
腐蚀
水溶液
极化(电化学)
压实
分析化学(期刊)
电化学
阴极保护
冶金
化学工程
复合材料
化学
电极
物理化学
工程类
色谱法
作者
Ashraf M. Abdel-Gaber,Ahmad Najem,Ramadan Awad
标识
DOI:10.1038/s41598-022-22663-6
摘要
The corrosion behaviour of (Bi, Pb)-2223 samples compacted at 0.3-1.9 GPa in 0.5 M of HCl, NaCl, and NaOH solutions at 30 °C was investigated using potentiodynamic polarization curves measurements and electrochemical impedance spectroscopy (EIS) technique as well as scanning electron microscopy (SEM) and energy dispersive X-ray emission spectroscopy (EDX). Polarization results showed that the increase in compaction decreases both cathodic hydrogen evolution or oxygen reduction and anodic (BiPb)-2223 superconductor dissolution in 0.5 M HCl, and 0.5 M NaOH. On the other hand, compaction mainly affects the anodic part of the polarization curves of (Bi, Pb)-2223 in 0.5 M NaCl solution. EIS measurements revealed that the highest protection of the superconductors was achieved in 0.5 M NaCl, while the lowest degree of protection was observed in 0.5 M HCl. SEM images show a random plate-like morphology fitted with the marker of (Bi, Pb)-2223 material. The compacted sample at 1.9 GPa indicates deformation of the grains and the formation of a micro-crack. The corrosion mechanism of the superconductor at different pH values was also discussed.
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