Methods and apparatus for protecting metal structures

Details Methods and apparatus for protecting metal structures Methods and apparatus for protecting metal structures

1986-06-03

1988-07-05

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204196, C23F 1300

Patent

active

047552670

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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