 The
ELTECH Disk Anode was developed specifically for the rigors of
cathodically protecting dam and navigation lock gates. Since our disk anodes
are designed to operate in fresh, brackish and seawater environments, other
suitable applications include: marine structures, water tanks, and vessels.
With an optional primary seal spacer gasket, it can be used on the inside of
pipes, tanks, or other curved surfaces.
The active element in
ELTECH's Disk Anode is a 6" diameter x 1/2" thick titanium disk with a mixed
metal oxide coating. This mixed metal oxide is a crystalline,
electrically-conductive coating that activates the titanium and enables it
to function as an anode. When applied on titanium, the coating has an
extremely low consumption rate, measured in terms of milligrams per year. As
a result of this low consumption rate, the dimensions of the anode remain
nearly constant throughout the design life.
The mixed metal oxide
coated disk is secured into a 12" diameter x 1/2" thick dielectric shield
made of a durable, chlorine resistant, molded FRP-vinyl ester. This FRP
shield has been designed to resist damage from floating debris and ice, as
well as serving to enhance the current throwing capability of the disk. The
shield also minimizes excessive current damage to the coating on surrounding
steel. The low profile Disk Anode fits flush with the surface, so total
protrusion from the steel bulkhead is a mere 1/2"
The coated titanium
Disk and shield assembly is attached to a 1-1/4" diameter FRP stud via an
interlocking epoxy joint. This unique joint enhances torque capability and
subsequent sealing. A 100% compressible EPDM elastomeric o-ring molded into
the shield assures a watertight seal between the disk and steel bulkhead,
while simultaneously allowing the shield to fit flush against the bulkhead.
Rod threads are platinum plated to prevent oxidation of the titanium -
providing a low and constant contact resistance over the life of the anode.
Nickel plated brass nuts further ensure a reliable, low resistance contact.
And to prevent crevice corrosion of the titanium disk, a special, mixed
metal oxide coating has been applied on the edges and back. |
