Table 1 Definitions of various electrochemical metrics for metal corrosion.

i_corr

Corrosion current density

Current density on the metal surface describing the general corrosion rate of metals.

i_pass

Passive current density

Current density in the passive region

E_corr

Corrosion potential

Potential at which the anodic and cathodic reaction rates are equal so that the measured current changes sign at this potential when the potential is scanned as in potentiodynamic polarization

E_pit

Pitting potential

Lowest potential at which stable pits form

E_rp

Repassivation potential

Potential at which stably growing localized corrosion (pits or crevices) repassivates and stops growing

E_crev

Crevice corrosion potential

Lowest potential at which stable crevice corrosion forms

T_pit (CPT)

Pitting temperature

Temperature above which stable pitting corrosion initiates

T_crev (CCT)

Crevice corrosion temperature

Temperature above which stable crevice corrosion initiates

Corrosion rate

Sample thickness loss per unit time, sometimes converted from weight loss per unit time normalized by sample area