Galvanic corrosion of weldments, like other forms of localized corrosion, can result in unexpected failures of piping and vessels when the welds are anodic to the base metal. Weld metals normally have a higher alloy content than the base metal it is intended to be used with (1) ; however, this is not always sufficient to insure that the weld is cathodic to the base metal. A zero resistance ammeter can be used to measure the galvanic current between dissimilar base metals (2-5)  and between base and weld metals (1) .

Subject
Water, Corrosion rate, Potential measurements, Seawater, Base metals, Current densities, Metals, Galvanic corrosion, Hydrocarbons, Electrodes, Corrosion potential, Weld metal, Galvanic couple
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1980
Association for Materials Protection and Performance (AMPP)
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