ROHRBACK COSASCO SYSTEMS CORRATER 9020, Руководство пользователя

Страница: 20 / 20

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).