cathodic polarization

cathodic polarization

[kə′thäd·ik ‚pō·lə·rə′zā·shən]
(physical chemistry)
Portion of electric cell polarization occurring at the cathode.
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In cathodic polarization the voltage increases with the corrosion current decreases until it reaches the lowest possible value.
The sacrificial zinc in the primer provides short-term protection to the exposed steel from corrosion through cathodic polarization, providing sufficient time for the silane to form an effective barrier layer.
The Icorr was determined by Tafel extrapolation of only the cathodic polarization curve alone, which usually produced a longer and better defined Tafel region [20].
Cathodic Polarization at Uncharged Surface Potential as the Way of Protection from Corrosive-Mechanical Destruction in Sea Water.
The anodic and cathodic polarization curves, according to ISO 17475, were recorded using two separated sweep potential scans in the range [+ or -] 1500 mV respect OCP with a scanning rate of 1 mV/s.
In addition, the obtained results revealed that the cathodic polarization curve of Zn--Ni--Fe alloy deposition (29) lies between the polarization curves of Zn and Ni or Zn and Fe.
cm would--in general--yield at least 100 mV cathodic polarization.
The time dependence of the anodic current response, which appears after a certain cathodic polarization, when the potential is returned to a value slightly more positive than open circuit potential, was also recorded.
In this study, cathodic polarization curves for ASTM A-36 steel was developed in geothermic fluid, using rotating electrode disc at different spin velocities, to characterize it kinetic mechanism.
Contrary to this, the DF of high strength ferritic steels is well known to produce strong AE signals [3, 4] and is accelerated by cathodic polarization where hydrogen cations can exist on the surface and in the crack.
After completion of the cathodic polarization, delamination of the coating is measured by placing tape across the scribe and pulling to remove the portion of the coating that has disbonded.