Arrangement for cathodic protection
OwnerFranciscus Brummelhuisinventor
Life of this patent
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Abstract
Arrangement for cathodic protection from corrosion of metal bodies surrounded by an electrolytic medium, comprising a metal anode body which is to be introduced into the medium and has a lower (electric) quiescent potential in the medium than the bodies to be protected, where, by means of circuit comprising at least Schottky diode operating above a certain threshold voltage, one of the bodies to be protected and another one of the bodies to be protected have a difference in potential which is at least equal to the threshold voltage, but smaller than the quiescent-potential differences of the two bodies.
Claims16
An arrangement for cathodic protection from corrosion of at least first and second metal bodies surrounded by an electrolytic medium, comprising:
- the first metal body;
- the second metal body, with the first body having a lower electric quiescent potential in the electrolytic medium than a quiescent potential of the second body,
- a metal anode body which has a lower electric quiescent potential in the electrolytic medium than the first body,
- circuit means for controlling potential difference between at least the first and second metal bodies, wherein the anode body and the bodies to be protected are electrically coupled to one another by said circuit means, said circuit means comprising at least one rectifier device operating above a certain threshold voltage and providing a potential difference between the first and second metal bodies which is at least equal to said threshold voltage but is smaller than the difference in quiescent potential between the first and second bodies.
An arrangement for cathodic protection from corrosion of at least first and second metal bodies surrounded by an electrolytic medium, comprising:
- the first metal body having a quiescent potential in the electrolyte medium;
- the second metal body having a quiescent potential in the electrolyte medium;
- a metal anode body which has a lower quiescent potential in the electrolytic medium than the quiescent potential of the first body;
- wherein the quiescent potential of the first body is lower than the quiescent potential of the second body, the quiescent potential of the second body relative to the anode body is above a voltage level at which disbonding of plastics from the second body occurs;
- wherein the first body and the second body are electrically interconnected so that their surfaces are at the same potential;
- and
- a circuit means for controlling potential difference between the anode body and the first and second bodies, comprising at least one rectifier device operating above a certain threshold voltage and providing a potential difference between the anode body and the first and second metal bodies, said potential difference is at least equal to said threshold voltage but is smaller than the difference in quiescent potential between the first and second bodies, and is smaller than the voltage level at which disbonding of plastics from the second body occurs.
Dependencies are inferred from the claim text.