Zinc Anodes
Extruded Zinc Anodes
Zinc anodes have been used since the 19th century
to protect steel structures from corrosion. Today,
these anodes are still widely utilized and have
proven to be an effective choice for preventing
corrosion in select soils and brackish waters. For
these environments, Corrpro offers zinc anodes
made to the ASTM B-418, Type II alloy standard.
The anodes generate an open circuit potential of 1.1
volts with respect to a Cu/CuSO4 reference cell.
Made from 99.99% pure high-grade zinc, Corrpro
zinc anodes offer a 90% current efficiency and
deliver a current capacity of 335 amp-hrs/lb. This
high purity composition also assures the anodes are
more resistant to passive films.
Corrpro zinc anodes are available in both cast and
extruded forms. The cast anodes are produced
in a variety of weights and are designed for
use in low-resistivity soil environments. These
anodes are manufactured with lead wires, and are
packaged in a backfill consisting of 75% gypsum,
20% bentonite and 5% sodium sulfate. Corrpro zinc
extruded anodes are produced in diamond-shaped
ribbon coils. The elongated shape allows for lower
resistance to earth than conventional zinc anodes and permits easy installation on a multitude of
structures.
Applications
Zinc cast anodes are recommended for use in soils
with resistivities below 1,000 ohm-cm. Because
these anodes have a driving voltage that is lower
than magnesium, they are most effective on well-coated
steel structures which require minimal
current output. The packaged anodes are commonly
used as grounding cells on electrical motors, panels
and conduits and across insulators on pipelines to limit
dangerously high voltages. The extruded ribbon anode
can be used in buried applications as well as in fresh,
brackish or salt water environments. Neither type of
zinc anode should be use in extremely alkaline conditions above
9.2 pH, acidic below 5 pH or high temperature above
140°F electrolytes.
Call 866.CORRPRO (866.267.7776) for more information or to place an order.
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