A corrosion protection cathode using an external power supply in which a reinforcing layer formed of a fiber base material is laminated with an adhesive layer on one surface of a conductive layer formed of a graphite sheet, and an electrolyte layer of an electrolyte-containing resin formed in a sheet shape and having adhesive power such that the layer is capable of being adhered to the conductive layer and to a surface layer of an object to be protected from corrosion is adhered by the adhesive power thereof to the other surface of the conductive layer, wherein the conductive layer always has a resistance value of 4 or less between any two points on the surface thereof on a side that comes into contact with the electrolyte layer.

A cathode protection method of embedded CFRP anode for reinforced concrete structure includes the following steps. Provide a preformed groove with a predetermined shape and size in a surface of a protection area of a reinforced concrete body, and remove dust in the preformed groove. Provide a CFRP member on the surface of the protection area of the reinforced concrete body. Coat an electrical conductive adhesive material between side surfaces of the reinforcing column of the CFRP member and the preformed groove and between the reinforcing plate and the reinforced concrete body. Connect the CFRP member with a positive electrode of an external DC power supply and the steel reinforcing element with a negative electrode of the external DC power supply.

In a method for cathodically protecting and/or passivating a metal section in an ionically conductive material such as steel reinforcement in concrete or mortar, an impressed current or sacrificial anode communicates electrical current to the metal section and a storage component of electrical energy which can be a cell, battery or capacitor is provided as a component of the anode. The storage component can have replacement energy introduced by re-charging or replacing the component from an outside supply. Typically the cell or storage capacitor has an outer case which carries an anode material as an integral outer component.

A single anode system used in multiple electrochemical treatments to control steel corrosion in concrete comprises a sacrificial metal that is capable to supporting high impressed anode current densities with an impressed current anode connection detail and a porous embedding material containing an electrolyte. Initially current is driven from the sacrificial metal [1] to the steel [10] using a power source [5] converting oxygen and water [14] into hydroxyl ions [15] on the steel and drawing chloride ions [16] into the porous material [2] around the anode such that corroding sites are moved from the steel to the anode restoring steel passivity and activating the anode. Cathodic prevention is them applied. This is preferably sacrificial cathodic prevention that is applied by disconnecting the power source and connecting the activated sacrificial node directly to the steel.

Provided are an aluminum cladding material having excellent corrosion resistance, a production method therefor, an aluminum cladding material for heat exchangers having excellent corrosion resistance, a production method therefor, an aluminum heat exchanger using said aluminum cladding material for heat exchangers, and a production method therefor. Said aluminum cladding material comprises an aluminum alloy core material and a sacrificial anode material layer clad on at least one surface thereof. The sacrificial anode material layer comprises an aluminum alloy containing 0.10 mass % or more and less than 1.50 mass % Si, 0.10 to 2.00 mass % Mg. Present therein is 100 to 150000 pieces/mm.sup.2 of MgSi-based crystallized product having a circle-equivalent diameter of 0.1 to 5.0 m, 7 pieces/mm.sup.2 or less of MgSi-based crystallized product having a circle-equivalent diameter of more than 5.0 m and 10.0 m or less in the sacrificial anode material layer.

Provided is a CFRP active-passive-confined compression-cast RC column incorporating cathodic protection, which includes a CFRP pipe; multiple longitudinal reinforcements inside the CFRP pipe; a stirrup inside the CFRP pipe connected to the longitudinal reinforcements; compression-cast concrete arranged in the CFRP pipe, the multiple longitudinal reinforcements and the stirrup are embedded in the compression-cast concrete; a power supply having a positive electrode connected to the CFRP pipe and a negative electrode connected to the multiple longitudinal reinforcements. The CFRP pipe with a present thickness forms an active confinement on the compression-cast concrete, and the power supply applies a current to the CFRP pipe as an anode to enable the multiple longitudinal reinforcements to obtain electrons, thus stably protecting the multiple longitudinal reinforcements as a cathode.

An anode apparatus for mounting on an external surface of a concrete structure to provide cathodic protection of metal members in the concrete uses a pre-assembled body which is typically elongate carrying a longitudinal anode, which can be sacrificial or impressed current, together with a supporting material having a front face for attachment to the surface and an impermeable plastic covering material at the rear face covering the anode and the supporting material when the front face is attached to the surface of the concrete. A channel defined on the front face is arranged to receive a layer of a conformable ionically conductive adhesive material for attachment to the external surface. A distance of the edge of the covering material is arranged to be similar to a distance of the metal from the external surface such that wetting and drying effects of environmental moisture are the same for the anode as for the metal components.

Provided is a CFRP active-passive-confined compression-cast RC column incorporating cathodic protection, which includes a CFRP pipe; multiple longitudinal reinforcements inside the CFRP pipe; a stirrup inside the CFRP pipe connected to the longitudinal reinforcements; compression-cast concrete arranged in the CFRP pipe, the multiple longitudinal reinforcements and the stirrup are embedded in the compression-cast concrete; a power supply having a positive electrode connected to the CFRP pipe and a negative electrode connected to the multiple longitudinal reinforcements. The CFRP pipe with a present thickness forms an active confinement on the compression-cast concrete, and the power supply applies a current to the CFRP pipe as an anode to enable the multiple longitudinal reinforcements to obtain electrons, thus stably protecting the multiple longitudinal reinforcements as a cathode.