Treatment process for concrete
US7909982B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Mar 14, 2006 |
| Grant date | Mar 22, 2011 |
| Priority date | — |
| Expiry date | Jan 4, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23F2213/31
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A single anode system used in multiple electrochemical treatments to control steel corrosion in concrete comprises a sacrificial metal that is capable of 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 then applied. This is preferably sacrificial cathodic prevention that is applied by disconnecting the power source and connecting the activated sacrificial anode directly to the steel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.