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Cathodic Protection, Corrosion Monitoring, Mitigation, Control and Testing
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ENGINEERING AND DESIGN
A galvanic sacrificial anode system uses an anode with a more "negative" electrochemical potential than the metallic structure being protected. To create cathodic protection, the potential of the metallic surface is polarized more negative until it has a uniform potential. The polarization occurs due to the current flow from the anode to the cathode (structure) which is caused by the difference in electrochemical potential between the anode and the cathode. When this is accomplished, the corrosion of the structure is greatly reduced or halted. The galvanic anode begins to corrode in place of the structure it is protecting and eventually must be replaced. Impressed Current Large structures or large amounts of pipeline require greater amounts of current. Galvanic anodes do not provide an economically friendly way to produce complete protection. Impressed Current Cathodic Protection systems use anodes connected to a DC power source, typically an AC powered rectifier. Anodes for these systems are tubular and solid rod shapes made of various specialized materials including graphite, platinum and niobium coated wire.
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GOUDY ENGINEERING, INC. P.O. Box 18258 Tucson, AZ 85731 (520) 298-1104 - Phone (520) 721-9406 - Fax |