Table 2 Comparison of polarization/impedance tests in bulk electrolyte and salt spray tests under thin-film electrolyte conditions

From: Effect of iron and manganese on the corrosion resistance of contaminated secondary Al-Si-Mg cast alloys

Feature

Polarization & EIS (Bulk electrolyte)

Salt spray (Thin film)

Electrolyte environment

Quasi-homogeneous bulk immersion

Highly aggressive53

Corrosion type

Phase-selective dissolution

Localized attack (pitting)

Limiting current density

Constant ((80 ± 30) μA/cm2 15)

Geometry of thin film electrolyte45

Interface dynamics

Stable interface

Subject to evaporation-condensation cycles

Cathodic kinetics

Diffusion-limited ORR

ORR with reaction control

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