Abstract
The effect of hydride formation on the corrosion behaviour of Zr–1%Nb alloy was investigated by potentiodynamic polarisation (PDP) and electrochemical impedance spectroscopy (EIS) measurements in 1M H2SO4 solution. Hydride phase was created by electrochemical charging method in 0.02M H2SO4 solution at room temperature. Hydrogen atoms adsorb on the sample, and then diffuse to the bulk, which causes formation of the hydride phase. The results of the X-ray diffraction and scanning electron microscopy (SEM) confirm the formation of hydride phases in the samples. By long charging time (72 h) and high current density (100 mA/cm2), a massive hydride phase formed, which induced cracks on the surface with 30 μm depth. These cracks along with the variations of the ionic and electronic properties of the oxide layer dramatically increase the corrosion rate of the hydrided sample (∼46 times).
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