When a metal electrode is immersed in a corrosive electrolyte,
anodic and cathodic reactions occur simultaneously on its surface.
Generally, the anodic reaction involves the oxidation of the metal
to metal ions, which are released into the environment, while the
cathodic reaction involves the reduction of species present in the
environment, such as molecular oxygen or hydrogen ions [1]. The
rate at which the anodic and cathodic reactions proceed can fluctuate
with time but, overall, the rate of the anodic and cathodic reactions
are balanced, at open-circuit potential, in order to preserve
electroneutrality [2]. Generally, the rate of the anodic reaction increases
with increasing electrode potential, while the rate of the
cathodic reaction increases with decreasing electrode potential.
Consequently, the average corrosion potential represents the potential
at which the average rates of anodic and cathodic reaction
are balanced. However, if for example, a rapid increase of the anodic
reaction rate proceeds, some of the charge generated by metal oxidation
can be transiently stored in the capacitance that is generated
due to charge separation at the metal-solution interface, known as
the double-layer capacitance, before being consumed by the cathodic
reaction on the electrode surface
When a metal electrode is immersed in a corrosive electrolyte,anodic and cathodic reactions occur simultaneously on its surface.Generally, the anodic reaction involves the oxidation of the metalto metal ions, which are released into the environment, while thecathodic reaction involves the reduction of species present in theenvironment, such as molecular oxygen or hydrogen ions [1]. Therate at which the anodic and cathodic reactions proceed can fluctuatewith time but, overall, the rate of the anodic and cathodic reactionsare balanced, at open-circuit potential, in order to preserveelectroneutrality [2]. Generally, the rate of the anodic reaction increaseswith increasing electrode potential, while the rate of thecathodic reaction increases with decreasing electrode potential.Consequently, the average corrosion potential represents the potentialat which the average rates of anodic and cathodic reactionare balanced. However, if for example, a rapid increase of the anodicreaction rate proceeds, some of the charge generated by metal oxidationcan be transiently stored in the capacitance that is generateddue to charge separation at the metal-solution interface, known asthe double-layer capacitance, before being consumed by the cathodicreaction on the electrode surface
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When a Metal electrode is immersed in a corrosive electrolyte,
anodic and cathodic reactions occur simultaneously on ITS surface.
Generally, the anodic Reaction involves the oxidation of the Metal
to Metal ions, which are Released Into the Environment, while the
cathodic Reaction involves the Reduction. of species present in the
Environment, such as molecular Oxygen ions or hydrogen [1]. The
rate at which the anodic and cathodic reactions PROCEED Can fluctuate
with time but, overall, the rate of the anodic and cathodic reactions
are Balanced, open-Circuit at potential, in Order to Preserve
Electroneutrality [2]. Generally, the rate of the anodic Reaction increases
with increasing electrode potential, while the rate of the
cathodic electrode Reaction increases with decreasing potential.
Consequently, the average corrosion potential represents the potential
at which the anodic and cathodic average of Reaction Rates
are Balanced. However, if for example, a increase of the anodic Rapid
Reaction rate proceeds, Some of the Charge Generated by oxidation Metal
Can be transiently stored in the capacitance that is Generated
Due to Charge Separation at the Metal-Solution interface, Known as
the Double. capacitance layer, before being consumed by the cathodic
electrode Reaction on the surface.
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