| Cathodic
protection has been successfully used to prevent corrosion of heat
exchangers, condensers, tanks and vessels used in fresh or salt
water. Cathodic protection is often used to supplement coatings
which have been applied to the wetted portions of these structures.
In cathodic protection, a very small electrical current flows from
an anode to the structure. This current will cause the electric
potential of the structure to shift in the negative direction. As
this shift occurs, the corrosion reaction slows down and eventually
stops. Cathodic protection can prevent corrosion from occurring
in the first place and it can stop the corrosion process if it has
already begun. Cathodic protection cannot, however, reverse corrosion
damage which has already occurred. |
Electrochemical
Devices, Inc. Products
Electrochemical
Devices, Inc. manufactures reference electrodes, impressed current
anodes and constant current rectifiers which are used for corrosion
prevention by the cathodic protection process.
To see an overview of our product line, click on Product
Line Guide.
Reference electrodes designed for through wall installation in heat
exchangers, condensers, tanks and vessels comprise our F
Series. Reference electrodes designed for mounting directly
on a heat exchanger or condenser tube sheet are found in our T
Series.
EDI also designs and manufactures custom corrosion monitoring and
prevention products for use in these applications. Click on the
appropriate Series to go to its Selection Guide for a further description
of the products. |
Featured
Product: Extreme Environment Reference Electrode
The performance and lifetime of a reference electrode is very
dependent upon its environment. High temperature will substantially
shorten the life of a reference electrode. High pressure may force
the working electrolyte into the gel chamber often contaminating
it. Certain chemical species, especially sulfides, will contaminate
a reference electrode even at ambient pressure. There are many
industrial applications such as oil separators, heater treaters,
bleach tanks, boilers and process vessels where the environment
is harmful to a reference electrode. Yet, some means of potential
measurement is required to monitor the cathodic protection system
for this equipment.
To
meet this need, EDI has developed a unique reference electrode
designed to operate in such extreme environments: Model
FE. It has two components, a conductive bridge and a reference
electrode body. The bridge is permanently threaded into the vessel
wall at each location where potential readings are required. It
serves as an ionically conducting link between the vessel contents
and the exterior. The materials and design of the bridge are such
that it can be used at temperatures up to 200F (95C) and pressures
up to 50psi (3.5 kg/sq.cm.). The reference electrode is designed
to mate with the bridge for making potential measurements. It
can be threaded into the bridge for a semi-permanent installation
when continuous measurements are required. For intermittent readings,
the reference electrode is simply pressed into the bridge; this
allows a single reference electrode to be used with several bridges.
The Model FE
reference electrode can take the heat; it can withstand the pressure;
it can deal with contaminants. The Model FE reference electrode
lets a corrosion engineer make potential measurements in places
never before possible.
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