CorroMap - Half Cell Potential, Corrosion Rate and Resistance Mapping from PCTE

The CorroMap provides easy to use half-cell potential measurement with many
user-friendly features. The CorroMap is a rapid, non-destructive technique for
the evaluation of reinforcement half-cell potentials and corrosion rates. It maps
the contour plots of half cell potential and resistance in colour on the screen
and for transfer to PC.

The CorroMap is a lightweight system with rechargeable batteries for optimum
portability and is designed to be operated by one man. It offers reliable
evaluation of reinforcement corrosion also in wet, carbonated or inhibitor
treated concrete so that the Half-cell potential and electrical resistance to the
cover layer are given.

The system will also take galvanostatic pulse measurements which are an
indication of the rate of corrosion of the reinforcing steel.

The equipment comes with a Lightweight electrode and a hand held computer
pre-installed with easy to operate software. A durable steel ring for applying
the current field to the reinforcement allows for measurements possible on
uneven and curved surfaces with a replaceable sponge.

The system also includes a variety of connections and cables to make obtaining
reinforcement contact as simple as possible.

APPLICATIONS

The CorroMap is typically used in connection with:

Swimming pools
Bridges
Balconies
Parking houses
Concrete structures in a marine environment

FEATURES

New handheld Psion work about PC with Windows CE 5.0 and colour Touch
Screen.
Protected against dust, rain and snow (IP65).
Up to 2400 automated measurements, one-man operated with "auto trigger"
and "auto increment" options.
Can measure related values of electrochemical potential and resistance.
System can be purchased with or without corrosion rate measurement

BENEFITS

On site graphic display – in colour.
Each colour represents a measurement interval for potential and resistance.
Zoom function of detail area with display of measurement values.
Measurement results in Excel-format are easily transferred to PC for further
processing and presentation.

ADVANTAGES

Estimation of the corrosion rate in the reinforcement can be made in less than
10 seconds.
Reliable evaluation of reinforcement corrosion also in wet, carbonated or
inhibitor treated concrete.
Half-cell potential and electrical resistance of the cover layer are given.
Lightweight electrode / hand held computer and easy to operate software.
Durable Guard Ring system for focusing the cur-rent field to the reinforcement.
Measurements possible on uneven and curved surfaces.

MEASURING THE CORROSION RATE

The CorroMap uses a galvanostatic pulse principle to establish the corrosion
current and therefore the corrosion rate of reinforcing steel.

The Corromap works by inducing a short duration anodic current pulse into the
reinforcement galvanostatically from a counter electrode placed on the concrete
surface together with a reference electrode.

By utilizing the ohmic resistance (electrical resistance), the DC polarisation
resistance over time, and the applied current, the corrosion current can be
estimated with the Stern Geary equation.