Methods and apparatus for protecting metal structures
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United States of America Patent
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-
Jul 5, 1988
Grant Date -
N/A
app pub date -
Jun 3, 1986
filing date -
Jun 3, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Corrosion prevention methods and apparatus are disclosed for protecting a metal structure immersed in a corroding electrolyte wherein a continuously applied filtered direct current is passed therethrough. A reference electrode or cell, preferably one, is immersed with the electrolyte between anode means and the structure wall but spaced a considerable distance from the wall. The metal structure potential is sensed and measured against the reference electrode, free of IR drop effect of the protective current and electrolyte resistivity variations, by automatic and periodic modulation of the protective current. Calculations are suitably made by a microprocessor-based controller which also regulates the protective current for maintaining a selected structural potential.
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