Ceramic coated strip anode for cathodic protection
First Claim
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1. A cathodic protection device for hydraulic structures which comprises:
- an elongated shield having a generally convex outer surface, when viewed along a plane perpendicular to the longitudinal axis of the shield, and an inner surface;
said inner surface of said shield being generally concave when viewed along a plane perpendicular to the longitudinal axis of said shield, such that said shield has the configuration of a segment of an annular wall which can flex upon being impacted by an external force;
said shield being a segment of a cylindrical pipe and the angle of inclusion of said segment being in the range of about 30°
to about 180°
;
said shield having an elongated groove in at least said generally convex outer surface with said groove extending at least generally parallel to said longitudinal axis;
an elongated anode having a substrate of a suitable valve metal and a coating on one face of said substrate, said coating being a suitable electrically conductive ceramic material, said anode being positioned in said shield such that said coating faces outwardly from said shield through said groove;
means for securing said shield to a hydraulic structure to be protected; and
means for electrically connecting said anode to a suitable external source of electric power.
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Abstract
An elongated anode, comprising an electrically conductive ceramic material coated on a valve metal substrate, is secured in a correspondingly elongated groove which extends longitudinally in a shield of electrically non-conductive material. The shield has a convex outer surface when viewed in a plane perpendicular to its longitudinal axis. The shield can be a longitudinal segment of a cylindrical thermoplastic pipe containing spirally wound reinforcing filaments. The interior space of the annular segment can be filled with a resilient material to provide a cushion.
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Citations
30 Claims
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1. A cathodic protection device for hydraulic structures which comprises:
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an elongated shield having a generally convex outer surface, when viewed along a plane perpendicular to the longitudinal axis of the shield, and an inner surface; said inner surface of said shield being generally concave when viewed along a plane perpendicular to the longitudinal axis of said shield, such that said shield has the configuration of a segment of an annular wall which can flex upon being impacted by an external force; said shield being a segment of a cylindrical pipe and the angle of inclusion of said segment being in the range of about 30°
to about 180°
;said shield having an elongated groove in at least said generally convex outer surface with said groove extending at least generally parallel to said longitudinal axis; an elongated anode having a substrate of a suitable valve metal and a coating on one face of said substrate, said coating being a suitable electrically conductive ceramic material, said anode being positioned in said shield such that said coating faces outwardly from said shield through said groove; means for securing said shield to a hydraulic structure to be protected; and means for electrically connecting said anode to a suitable external source of electric power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification