Galvanic anode system for the corrosion protection of steel in concrete

Patent metadata

Field	Value
Publication number	US-10329673-B2
Application number	US-201515322308-A
Country	US
Kind code	B2
Filing date	Jun 29, 2015
Priority date	Jun 27, 2014
Publication date	Jun 25, 2019
Grant date	Jun 25, 2019

Abstract

A galvanic anode system for the corrosion protection of steel in concrete includes a galvanic anode material, which includes of zinc and alloys thereof, embedded in a solid electrolyte, and is characterized in that the galvanically available surface is larger, preferably at least twice as large, as the total geometrical surface of the metal anode. The galvanic anode system is also characterized in that, during operation, during which the anode disintegrates as a sacrificial anode, the galvanically active anode surface is reduced only slightly, preferably is not reduced up to at least 50%, in particular 75%, of the time during use.

First claim

The invention claimed is:

1. A galvanic anode system for corrosion protection of steel in concrete, the galvanic anode system comprising a galvanic stacked anode embedded into an ion-conductive matrix, wherein:
the galvanic stacked anode is composed of layered galvanic sub-anodes comprising holes, the sub-anodes each being selected from perforated plate, perforated sheet, grid and mesh, composed of zinc or an alloy thereof,
the thickness of each of the sub-anodes is ≤twice the hole diameter of the holes in the respective sub-anode, and as a result of the thickness of the sub-anodes, the hole diameter of the holes in the sub-anodes, and a distance between each of the sub-anodes, the sub-anodes are galvanically activated one after the other during operation of the galvanic anode system, and
the geometric total volume of the stacked anode is at least 2.3 times as high as the volume of the zinc or alloy thereof, such that the galvanically available surface area of the galvanic stacked anode is greater than its geometric total surface area.

2. The galvanic anode system for corrosion protection of steel in concrete as claimed in claim 1 , wherein the galvanically available surface area of the galvanic stacked anode is greater than the galvanically active surface area of the galvanic stacked anode.

3. The galvanic anode system for corrosion protection of steel in concrete as claimed in claim 2 , wherein the galvanically active surface area of the galvanic stacked anode does not decrease significantly.

4. The galvanic anode system for corrosion protection of steel in concrete as claimed in claim 1 , wherein the galvanically available surface area of the galvanic stacked anode is at least 1.7 times as high as its total surface area.

5. The galvanic anode system for corrosion protection of steel in concrete as claimed in claim 1 , wherein the diameter of the holes in each sub-anode is greater than the distance between the holes.

6. The galvanic anode system for corrosion protection of steel in concrete as claimed in claim 1 , wherein the ion-conductive matrix hardens.

7. The galvanic anode system for corrosion protection of steel in concrete as claimed in claim 1 , wherein the ion-conductive matrix has a pH of ≥7.

8. The galvanic anode system for corrosion protection of steel in concrete as claimed in claim 1 , wherein the ion-conductive matrix surrounds the galvanic stacked anode on all sides.

9. The galvanic anode system for corrosion protection of steel in concrete as claimed in claim 1 , wherein the volume of the ion-conductive matrix is greater than the galvanically available volume of the galvanic stacked anode.

10. The galvanic anode system for corrosion protection of steel in concrete as claimed in claim 1 , wherein the volume of the ion-conductive matrix is 1.5 times as high as the galvanically available volume of the galvanic stacked anode.

11. The galvanic anode system for corrosion protection of steel in concrete as claimed in claim 1 , wherein the hole diameters in the galvanic sub-anodes and the thickness of the sub-anodes are chosen such that the galvanic stacked anode can be galvanically active on all sides.

12. A process for producing a galvanic anode system as claimed in claim 1 , comprising embedding the galvanic anode material into the ion-conductive matrix.

13. The process as claimed in claim 12 , wherein the galvanic anode system is prefabricated.

14. The process as claimed in claim 13 , wherein the prefabricated galvanic anode system is bonded onto the concrete and/or embedded into the concrete.

Assignees

• Schwarz Wolfgang
• Sika Tech Ag

Inventors

• Schwarz Wolfgang

Classifications

• C04B41/50

  with inorganic materials · CPC title

• C23F13/08

  Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto · CPC title

• C23F13/10

  Electrodes characterised by the structure (C23F13/16 takes precedence) · CPC title

• C04B2111/265

  Cathodic protection of reinforced concrete structures · CPC title

• C23F13/16 Primary

  Electrodes characterised by the combination of the structure and the material · CPC title