CORRATER
Transmitter User Manual
16
material in the aqueous environment. This is the measurement technique that it is
utilized in CORRATER
instruments to provide a qualitative measure of pitting tendency.
In CORRATER
instruments, the imbalance (or pitting) units have been established to
be 2.5 microamperes (
µ
a.) which scales to a current density of 0.5
µ
a./cm
2
(the
CORRATER
electrode surface area is 5 cm
2
).
The scale factor above was established from empirical data so that the relative
magnitudes of corrosion rates in mils per year (MPY) and imbalance readings could be
compared. At this scale factor, the dominant corrosion mechanism is the one which
exhibits the greater magnitude (i.e. corrosion rate > imbalance indicates more general
corrosion and imbalance > corrosion rate indicates more pitting activity).
Summary of Contents for CORRATER 9020
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