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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:

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Corrosion protection techniques

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  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

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