cathodically protected carbon steel. The results show that the corrosion
rate is independent of transfer current density (0-200 A/m2) and power
frequency (50-200 Hz) on cathodically protected carbon steel. On the
anodes (AlZnIn), the corrosion rate increases as a function of transfer
current density (0-80 A/m2). However, the correlation is less prominent
at higher frequencies (100-200 Hz). For the freely corroding super
duplex, the correlation is similar to that on the anodes for the highest
current density (1000 A/m2). For the lowest current densities (100 A/m2),
the corrosion rate was independent of power frequency. Safe levels for
AC induced transfer current densities are proposed at power frequencies
of 50, 100 and 200 Hz.
KEY WORDS: Alternating Current Corrosion; Laboratory Tests;
Carbon Steel; AlZnIn Anodes; 25Cr Duplex; Current Transfer Density.