41 © 2017 Proceq SA
vertical cursor. If the surface under test has both actively corroding as
well as passive rebars, then the two states exhibit two distinct partially
overlapping distributions, with the corroding areas centered on a more
negative potential.
Cumulative Distribution View
Figure 40: Cumulative Distribution View
The cumulative distribution graph is used to determine the active and
passive potential thresholds that will affect the Chipping Graph, discrimi-
nating actively corroding areas from passive areas where no corrosion is
to be expected.
If the surface under test has both actively corroding as well as passive
rebars, then the curve will typically exhibit a central region with a lower
gradient (more flat). The two points where the gradient changes can be
marked on the screen by dragging the two vertical cursors.The red cursor
will define the maximum (most positive) potential value expected of the
active distribution.
The green cursor will define the minimum (most negative) potential of the
passive distribution.
Active corrosion is to be expected in the region of the left hand (more
negative) straight section.
Once these cursor lines have been set, the surfaces in this potential
range will be automatically displayed in the corresponding color in the
Chipping Graph View.
NOTE! It is always advisable to perform direct visual check
on open locations in order to confirm/refine the expected
corrosion potential thresholds
Chipping Graph View
Figure 41: Chipping Graph View
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