corrosion protection techniques
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Transcript of corrosion protection techniques
Corrosion protection techniques
Rak‐43.3312 Repair Methods ofRak 43.3312 Repair Methods of Structures II (4 cr)
E k SiEsko Sistonen
Some standards and publications related to corrosion protection techniques
• CATHODIC PROTECTION OF STEEL IN CONCRETE (ISO• 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 ANDDEFINITIONS, REQUIREMENTS, QUALITY CONTROL AND
EVALUATION OF CONFORMITY.• PART 9: GENERAL PRINCIPLES FOR THE USE OF
PRODUCTS AND SYSTEMSPRODUCTS AND SYSTEMS• Case Studies of Rehabilitation, Repair, Retrofitting, and
Strengthening of Structures By Mourad M. Bakhoum, IABSE 20102010
• Durability of Engineering Structures: Design, Repair and Maintenance By Jan Bijen, 2003y j ,
Principles and methods related to reinforcement corrosionEN 1504‐9:2008 (E)
i i i i• 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
Principles and methods related to reinforcement corrosionEN 1504‐9:2008 (E)
• 8. Increasing resistivity– 8.1 Hydrophobic impregnationy p p g
– 8.2 Impregnation
8 3 Coating– 8.3 Coating
• 9. Cathodic control– 9.1 Limiting oxygen content (at the cathode) by saturation or surface coatingg
Principles and methods related to reinforcement corrosionEN 1504‐9:2008 (E)
• 10. Cathodic protection– 10.1 Applying an electrical potentialpp y g p
• 11. Control of anodic areas11 1 A i i f h i f– 11.1 Active coating of the reinforcement
– 11.2 Barrier coating of the reinforcement
– 11.3 Applying corrosion inhibitors in or to the concrete
Simplified POURBAIX‐DIAGRAM / Tap Water / IronWater / Iron
Anodic protection
Protection by yAlkalization
Cathodic protectionCathodic protection
Simplified POURBAIX‐DIAGRAM / Clorides solution / Iron
7.3 Electrochemical Realkalisation
http://www.norcure.com/Realk.pdf
7.3 Electrochemical Realkalisation7.3 Electrochemical Realkalisation
Case: Pasila, Helsinki
7.4 Realkalisation of carbonated concrete by diffusion7.4 Realkalisation of carbonated concrete by diffusion
Not alkalied Coating
Not alkalied area area
Etki cs
7.5 Electrochemical chloride extraction
Vandex International Ltd 15/09/99, SBhttp://www.norcure.com/chloride.htm
Chloride extraction with renovation render / plaster / mortar)
M th d f t ti i f t i
metallic copper and/or copper compounds are added to the concrete mass, in which
Method for protecting reinforcement in concrete from chloride corrosion
mass the copper reacts with the chloride to form salts with a chloride content and of low solubility, thus substantially reducing the danger of steel corrosion caused by chloride. The copper or copper compound can also be brought into close contact with h f l i h f f i
Vandex International Ltd 15/09/99, SBhttp://www.google.com/patents/EP1290245B1?cl=en
the concrete, for example in the form of a repair mortar.
8.1 Hydrophobic impregnation8.1 Hydrophobic impregnation-based on Silanes or Siloxanes, or blends of these materialskth.diva-portal.org/smash/get/diva2:305538/FULLTEXT02
http://web byv kth se/shared/pdf/83 Johansson%20A %20http://web.byv.kth.se/shared/pdf/83_Johansson%20A.%20b84.pdf
8.2 Impregnation -water proof products (sealant)p p ( )-corrosion inhibitors
8.3 Coating
-Chemically and physically drying coatingsOrganic and inorganic coatings-Organic and inorganic coatings
9. Cathodic control9.1 Limiting oxygen content (at the cathode) by saturation or surface coating) y g
Creating condition in which potentiallyth di f i f t bl tcathodic areas of reinforcement are unable to
drive an anodic reaction
Advanced Concrete Technology 3: Processes, Volume 3edited by John Newman, B S Choo
10. Cathodic protection
http://www.norcure.com/Corrosion.pdf
Installation of Impressed Current Cathodic Protection System
http://www.cedd.gov.hk/eng/about/organisation/org_ceo_pm.htm
Cathodic protection with Titanium meshCathodic protection with Titanium mesh
Ted Kay: Assessment and renovation of concrete structures
http://www repairandprotect com/projects/pearl harbor/cathodic protection htmhttp://www.repairandprotect.com/projects/pearl_harbor/cathodic_protection.htm
Good anode materials:‐magnesium alloy(6 % Al, 3 % Zn, 0.15 % Mn)‐zinc‐aluminium (5 % Zn)‐titanium
http://www.accessscience.com/search.aspx?rootID=792458
http://www.norcure.com/Corrosion.pdf
11.1 Active coating of the reinforcement
Painting reinforcement with containing activei t A ti ti f i f t ipigments. Active coating for reinforcement is
coating which contain Portland cement orl t h i ll ti i t ( i ) hi helectrochemically active pigments (zinc) which
may function as inhibitors or which may providel li d th di t tilocalized cathodic protection
11.2 Barrier coating of the reinforcementBarrier coatings for reinforcement are coatingswith the aim of isolating it from the pore waterwith the aim of isolating it from the pore waterin the surrounding mortar or concrete
E C t d R i f t-Epoxy Coated Reinforcement-Galvanised reinforcing steel-Galvanised and Epoxy Coated Reinforcement-Galvanised and Epoxy Coated Reinforcement-Others
Concrete Structure Management:Guide to Ownership and Good Practice : pGuide to Good Practice Bulletin 44, FIB -Féd. Int. du Béton, 2008
11.3 Applying corrosion inhibitors in or to the concrete
Migrating corrosion inhibitors (MCI)
Volatile corrosion inhibitors (VCI)
http://www.cortecmci.com/
http://www.offshore-technology.com/contractors/corrosion/corroless
Other types of techniques
• non‐metallic FRP (Fibre Reinforced Polymer) bars and elements– Glass Fiber Reinforced Polymer (GFRP)
Carbon Fiber Reinforced Polymer (CFRP)– Carbon‐Fiber‐Reinforced Polymer (CFRP)• the risk of salt‐frost resistance
h i k f h lk li i• the risk of the alkali‐reaction
ACI 440.1R “Guide for the Design and Construction of StructuralConcrete Reinforced with FRP Bars”
FIB Task Group 9.3 – bulletin 40 “FRP Reinforcement in RCStructures”
http://aslanfrp.com/Aslan100/Resources/Aslan100a.pdf
Avoid combining idAvoid combining different metals
Avoid gaps