Electrochemical characteristics of the dynamic progression of erosion-corrosion under different flow conditions and their effects on corrosion rate calculation

Ni-MOF composite polypyrrole applied to supercapacitor energy storage

“… 36 Diffusion-controlled control is beneficial for storing more charge, while the capacitive-dominant process is beneficial for fast charging and discharging. 37 According to Fig. 7a , the b value at oxidation and reduction peak voltages are close to 1, indicating the pseudocapacitance properties of the electrode material.…”

Coupling Effect of Hydrostatic Pressure and Erosion on Corrosion Behavior of X70 Steel in Simulated Seawater

“…By observing the anodes and cathodes of the polarization curves, it is found that the polarization curve shapes at 2 to 15 MPa are similar to those of the erosion–corrosion experiment, which is a combination of uniform corrosion and pitting (Figure ). The anodic polarization curve with a lower slope has no inflection point at 0.1 MPa; the cathode polarization curve hardly changes in the potential range of −0.64 V to −0.7 V. The diffusion of oxygen is considered the key to controlling the corrosion rate. ,,, In addition, the open circuit potential is much higher than other conditions at 0.1 MPa, indicating that the metal has higher thermodynamic stability and a lower tendency for corrosion . Pressure increases the corrosion rate of the X70 steel not only by affecting the thermodynamic stability of the material but also by promoting corrosion kinetics of the material.…”

“…The potentiodynamic polarization curves of X70 steels after 24 h of exposure to erosion–corrosion under different pressures are plotted in Figure c. The existence of the same corrosion mechanism is due to the similar shapes of the polarization curves under each condition . Pitting potential is defined as the potential at which the current density increases abruptly, such as that found in the rupture of the passivation film in stainless steel.…”

“…The potentiodynamic polarization curves of X70 steels after 24 h of exposure to erosion–corrosion under different pressures are plotted in Figure 4 c. The existence of the same corrosion mechanism is due to the similar shapes of the polarization curves under each condition. 16 Pitting potential is defined as the potential at which the current density increases abruptly, such as that found in the rupture of the passivation film in stainless steel. Although the apparent pitting potential on the polarization curve was not observed, there is one inflection point, and the slope value of the curve after the inflection point is smaller than that before the inflection point.…”

“…Moreover, a study 15 revealed that the rotating speed changed the corrosion type of X65 steel from pure uniform electrochemical corrosion into a combination of uniform corrosion and local damage, which was aggravated by increasing the rotating speed. Xu et al 16 calculated the critical impact energy for the initiation of erosion–corrosion of X65 steel.…”