1 / 20

Corrosion protection techniques

Corrosion protection techniques. Rak-43.3312 Repair Methods of Structures II (4 cr) Esko Sistonen. Some standards related to corrosion protection techniques. CATHODIC PROTECTION OF STEEL IN CONCRETE (ISO 12696:2012) SFS-EN 1504 (ten parts); Summarized in:

homer
Download Presentation

Corrosion protection techniques

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Corrosion protection techniques Rak-43.3312 Repair Methods of Structures II (4 cr) Esko Sistonen

  2. Some standards related to corrosion protection techniques • CATHODIC PROTECTION OF STEEL IN CONCRETE (ISO 12696:2012) • SFS-EN 1504 (ten parts); Summarized in: • PRODUCTS AND SYSTEMS FOR THE PROTECTION AND REPAIR OF CONCRETE STRUCTURES. • DEFINITIONS, REQUIREMENTS, QUALITY CONTROL AND EVALUATION OF CONFORMITY. • PART 9: GENERAL PRINCIPLES FOR THE USE OF PRODUCTS AND SYSTEMS

  3. Principles and methods related to reinforcement corrosionEN 1504-9:2008 (E) • 7. Preserving or restoring passivity • 7.1 Increasing cover with additional mortar or concrete • 7.2 Replacing contaminated or carbonated concrete • 7.3 Electrochemical realkalisation of carbonated concrete • 7.4 Realkalisation of carbonated concrete by diffusion • 7.5 Electrochemical chloride extraction

  4. Principles and methods related to reinforcement corrosionEN 1504-9:2008 (E) • 8. Increasing resistivity • 8.1 Hydrophobic impregnation [based on Silanes or Siloxanes, or blends of these materials] • 8.2 Impregnation [water proof products (sealant), corrosion inhibitors] • 8.3 Coating • 9. Cathodic control • 9.1 Limiting oxygen content (at the cathode) by saturation or surface coating

  5. Principles and methods related to reinforcement corrosionEN 1504-9:2008 (E) • 10. Cathodic protection • 10.1 Applying an electrical potential • 11. Control of anodic areas • 11.1 Active coating of the reinforcement • 11.2 Barrier coating of the reinforcement • 11.3 Applying corrosion inhibitors in or to the concrete

  6. Simplified POURBAIX-DIAGRAM / Tap Water / Iron Anodic protection Protection by Alkalization Cathodic protection

  7. Simplified POURBAIX-DIAGRAM / Clorides solution / Iron

  8. Electrochemical Realkalisation http://www.norcure.com/Realk.pdf

  9. Electrochemical Realkalisation

  10. Realkalisation of carbonated concrete by diffusion

  11. Chloride extraction (mortars) Extracting the aggressive chloride ions from concrete Vandex International Ltd 15/09/99, SB

  12. Electrochemical chloride extraction http://www.norcure.com/chloride.htm Vandex International Ltd 15/09/99, SB

  13. Cathodic protection http://www.norcure.com/Corrosion.pdf

  14. Installation of Impressed Current Cathodic Protection System http://www.cedd.gov.hk/eng/about/organisation/org_ceo_pm.htm

  15. Cathodic protection with Titanium mesh Ted Kay: Assessment and renovation of concrete structures

  16. http://www.repairandprotect.com/projects/pearl_harbor/cathodic_protection.htmhttp://www.repairandprotect.com/projects/pearl_harbor/cathodic_protection.htm

  17. http://www.norcure.com/Corrosion.pdf

  18. Good anode materials: -magnesium alloy -1.6 V (6 % Al, 3 % Zn, 0.15 % Mn) -zinc -1.1 V -aluminium (5 % Zn) -1.05 V

  19. Applying corrosion inhibitors in or to the concrete Migrating corrosion inhibitors (MCI) Volatile corrosion inhibitors (VCI)

  20. Avoid combining different metals Avoid gaps

More Related