Question

explain why Faraday's equation is related to corrosion rate?​

Answer 1

Answer:

Explanation:

Faraday’s law is used to compute corrosion rates according to the kinetics of the cathodic and anodic reactions or the oxidation-reduction. Based on this empirical law, a linear relationship exists between the rate of corrosion or metal dissolution and the corrosion current.

Answer 2

Faraday's theory:

Faraday's theory states that, "when current produced by anodic areas are known, it is possible to calculate the rate of corrosion penetration or corresponding mass loss"

Faraday's equation:

$RM = M/nFP (icorr)$

where,

RM - Corrosion rate

Icorr - Corrosion current

M - Atomic weight of metal

p - Density

n - Charge number of electrons exchanged within dissolution reaction

F - Faraday constant (96.485 C/mol)

M/n - Equivalent weight

Principles:

• Faraday’s law is used to determine corrosion rate based on the kinetics of the cathode and anode reactions otherwise known as the oxidation-reduction process.
• The determination of the rate of corrosion requires the determination of corrosion currents. This is possible only when the  reaction mechanisms which involves the corrosion reactions are also identified.
• In this case, Tafel slope analysis is used to calculate corrosion currents. Based on this, the Tafel plot is used in the  performance analyzing the currents.