Cathodic Protection, Corrosion Monitoring, 

Mitigation, Control and Testing

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GALVANIC ANODES

Galvanic anodes are used in cathodic protection to reduce corrosion. Once attached to a metallic structure, the anode draws corrosion away from the structure and onto itself.  The structure becomes the "cathode", or the negative entity through which reduction occurs.  

Anodes come in a variety of types and sizes.  There are two types of galvanic metal used most often for buried pipelines: magnesium and zinc. 

MAGNESIUM

Magnesium anodes can come bare or pre-packed in backfill.  Pre-packed anodes are packed in a biodegradable bag , the intention of which is to keep the gypsum within the anode hole.  Magnesium anodes are the most widely used for soil applications. 

ZINC

Zinc anodes are generally used in earth anode beds.  The anodes are typically slender in structure to achieve low resistances to the earth and to achieve practical current output.  Zinc anodes come bare, pre-packed and ribbon type.

IMPRESSED CURRENT

Impressed current anodes are used with larger structures on which a sacrificial galvanic anode system would not prove economical. This type of corrosion control utilizes an external source of direct current, namely a rectifier. There are many different types of impressed current anodes.  Here are two popular types used.

STANDARD GRAPHITE

This is an inexpensive impressed current anode in rod form.  

                                                  Click to enlarge

PLATINUM

This anode is consumed at at very low rate.  It's efficiency compensates for the higher cost of this type of anode.

GOUDY ENGINEERING, INC.

P.O. Box 18258 

Tucson, AZ  85731

(520) 298-1104 - Phone  (520) 721-9406 - Fax

goudyeng@theriver.com

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