Disk Anode
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 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.
