Effect of hydride formation on corrosion behaviour of Zr–1%Nb alloy in sulphuric acid solution

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 H 2 SO 4 solution. Hydride phase was created by electrochemical charging method in 0.02M H 2 SO 4 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 m\ \ A cm 2 ), a massive hydride phase formed, which induced cracks on the surface with 30 mm 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).

Chemical Vapor Deposition Synthesis and Characterization of Hollow Carbon Nanospheres with High Specific Capacitance and Excellent Cycling Stability

“…The small arc (at high frequency) is related to the charge-transfer resistance (R ct ), which is a result of the Faradaic reactions between an electrolyte solution and HCNS electrode. 43,44 As seen in Fig. 9, the almost straight line at lower frequencies illustrates that the HCNS electrode has lower charge-transfer resistance.…”