Sharp decreases in the current output of zinc galvanic anodes in sea water are attributed to the increase in the electrical resistance and tenacity of the corrosion product films which form on the anode’s surface. This behavior is influenced largely by the amount of iron present as a minor impurity in the zinc. Iron content should be kept below .0015 percent for best results. Zinc containing a higher iron concentration will develop a high resistance corrosion product film which will render the zinc less effective as an anode material. 5.2.2
Subject
Electric current,
Films,
Water,
Galvanic anodes,
Composition,
Zinc anodes,
Iron,
Corrosion products,
Hull,
Anodic current,
Steel,
Zinc,
Galvanic current
Copyright 1956 by the National Association of Corrosion Engineers.
1956
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