Influence of nitrogen immersion and NiO nanoparticles on the electrochemical behavior of (Bi, Pb)-2223 superconductor in sodium sulfate solution

Abstract

Purpose

The paper aims to examine the inhibition effect of NiO nanoparticles and the influence of liquid nitrogen immersion on the corrosion behavior of (NiO)_x(Bi_1.6 Pb_0.4)Sr₂Ca₂Cu₃O_10-δ and (NiO)_x (Bi, Pb 2223), where x = 0.00 and 0.05 Wt.% phase superconductor in 0.1 M Na₂SO₄ at 30°C.

Design/methodology/approach

This study was done using open-circuit potential electrochemical impedance spectroscopy, potentiodynamic polarization curves and chronoamperometry measurements.

Findings

Potentiodynamic polarization technique showed that NiO nanoparticles suppress both the anodic and cathodic parts of the polarization curves of (NiO)_x(Bi, Pb)-2223 superconductor in 0.1 M Na₂SO₄ solution. A significant enhancement in the corrosion resistance of the prepared superconductors is observed on immersing them in liquid nitrogen. This is owing to the fact that immersion in liquid nitrogen increases the volume contraction of the superconductor matrix, causing the shrinkage of the pores and voids present in the samples and thus reducing the active surface area for the dissolution of (NiO)_x(Bi, Pb)-2223 superconductor matrix.

Originality/value

This paper fulfills the need to investigate the corrosion behavior of superconductors and the influence of liquid nitrogen immersion on such behavior.

Citation

Rahal, H.T., Abdel-Gaber, A.M., Awad, R. and Abdel-Naby, B.A. (2018), "Influence of nitrogen immersion and NiO nanoparticles on the electrochemical behavior of (Bi, Pb)-2223 superconductor in sodium sulfate solution", Anti-Corrosion Methods and Materials, Vol. 65 No. 4, pp. 430-435. https://doi.org/10.1108/ACMM-02-2018-1900