This document discusses migratory corrosion inhibitors and their benefits compared to other corrosion protection methods. It provides examples of how migratory corrosion inhibitors can double the service life of concrete in various industries. Modeling shows they increase service life from 15 to 50 years depending on the concrete's chloride content and cover depth. Field studies found migratory corrosion inhibitors reduced corrosion rates by 5 times compared to untreated concrete. They provide corrosion protection even with cracks and have fewer drawbacks than alternatives like epoxy-coated rebar or waterproofing. The cost of migratory corrosion inhibitors is low, around 0.07% of total construction costs for large projects.

1. Migratory
Corrosion
Inhibitors
Philip Horsford
Cortec Southeast Asia Pte Ltd

2. Presenter
Areas of expertise
• Transit and packaging solutions
• Preservation & Mothballing of equipment
• Mitigating soil-side corrosion for AST’s
• Corrosion control for heavy industry
• Lay up for assets exposed to marine and offshore Environments
• Corrosion mitigation for steel reinforced concrete structures
Philip Horsford
Regional Manager
Cortec Southeast Asia
phorsford@cortec-sea.com
+65 9148 1749

3. Water and Wastewater
Marine/Shipbuilding
Aviation/Aerospace
Power Generation
Construction
Automotive
Oil & Gas
Military
Mining

4. Life-365 Modelling
Cover DC (m2/Sec) Surface Chloride Service Life without MCI Service Life with MCI
40 4.0 X 10-12
0.90% 15 50
50 4.0 X 10-12
0.90% 25 80
60 4.0 X 10-12
0.90% 40 115
70 4.0 X 10-12
0.90% 55 150
75 4.0 X 10-12
0.90% 65 150
Mix design: 30% FA, 5% MS , W/C 0.35- 0.4

5. Life-365 Modelling

6. Field Study
0.00
2.00
4.00
6.00
8.00
10.00
12.00
2000 2002 2004 2006 2008 2010 2012
CORROSIONRATE(ΜM/YEAR)
TIME (YEARS)
MCI-2000
Control
Time Vs Corrosion Rate

7. MCI Vs Calcium Nitrites
MCI 2005 Calcium Nitrites
Dose 0.6 liter 10-30L (more than 17.5L to be effective
Performance
Increases Ct to .18%
Reduces CR by 5 times
Protects anode and cathode
Under dosing accelerates pitting corrosion
Only anodic
Setting problem becomes worse at high dosage rates
Increase shrinkage
Corrosion Inhibition Migrating effect (covers the steel)
Reacts with chlorides within the concrete (not
migrating)
Surface contact inhibitor
Concrete Strength
Similar to control @ day 7
More than control @ day 28
Increases early strength
Reduces ultimate strength
Setting Time Retarder Accelerator

8. MCI Vs Epoxy Coated Rebar
MCI 2005 Epoxy Coating
Dose 0.6 liter Dry Coat Thickness (50-100 microns/coat)
Practicality
No risk of accelerated pitting corrosion
No effect on the bond
Dosed easily at ReadyMix Plant
Risk of pitting corrosion
Affect bond
QC diffulty
Coating repair required when cutting or bending
Performance
Outperforms ECR life extension
Migrating
Externds service life when managed properly
Price
Fixed
Life cycle cost much less than ECR
Varies (normally higher)
LCC is higher
Environmental Impact Bio-based from renewable resource Not from renewable resource

9. MCI Vs Waterproofing
MCI 2005 Hydrophobic Water proofing Hydrophilic Waterproofing
Performance Corrosion Inhibitor (No effect on permeability)
Waterproofing that reduces
water adsorption
Waterproofing effect with
autogenous cracks healing
Advantages Migrating (performs even with cracks) Drops water adsorption
Works under hydrostatic
pressure
Replaces conventional
waterproofing
Disadvantages
Does not improve permeability
Retards setting
Reduced strength
Ineffective in cracked zones
Retards setting
Compatibility issues
Reduces strength
Self heals crack to specific
crack width
48 hours to heal
Costly
Requires redesign

10. Princess Tower
48
103
0
20
40
60
80
100
Without MCI-2005 With MCI-2005
SERVICELIFE(YEARS)
Item Cost (USD)
Construction Cost 188,010,899
Cost of MCI 2005 136,240
0.07%
of cost

11. Why MCI?
Effective protection
Biobased – renewable resource
Contributes to LEED credits
Effective at extending service life
Fixed low dosage
True second line of defense