Post on 26-Dec-2015
Rebuilding the Gulf Coast in the Aftermath of Hurricane Katrina: Corrosion Control and Mitigation
Janice K. Lomness
Corrosion Technology Laboratory
NASA Kennedy Space Center, FL 32899
Introduction
• Corrosion is a widespread and costly problem.• Corrosion costs the United States over $300 billion
each year.• Rebuilding or repairing hurricane damage.• Corrosion control and mitigation into the design,
materials selection, or repair stage of development.
• Avoid catastrophic failures and expensive repairs.
Corrosion Control and Mitigation
• Design Engineers, Material Science Engineers, and Corrosion Experts.
• Identify forms of corrosion that will affect system being developed.Uniform Corrosion, Pitting Corrosion, Crevice
Corrosion, Filiform Corrosion, Erosion Corrosion, Galvanic Corrosion, Selective Leaching/Dealloying, Intergranular and Exfoliation Corrosion, Stress Corrosion Cracking, Corrosion Fatigue, Fretting Corrosion
Corrosion Control and Mitigation
• Design considerationMaterial properties that influence the
degradation of the material and the probability for a particular form of corrosion of the material to lead to catastrophic failure.
Determine the extent by which a specific form of corrosion affects a material.
• Susceptibility of the material to corrosionSusceptible alloysResistant alloys
AMPTIAC Quarterly Volume 9, Number 3, 2005AMPTIAC Material Failure Modes Desk Reference
Kennedy Space Centers Experience with Corrosion
The launch environment at KSC is extremely corrosive:
Ocean salt sprayHeatHumiditySunlight
Vehicle Assembly Building
• 525 ft tall• 716 ft long• 518 ft wide• Covers 8 acres• Encloses 129,428,000 ft3
• Rose Bowl or Yankee Stadium could fit on roof.
VAB Corrosion Mitigation
• Corrosion due to the presence of salt resulting from the exposure to sea water or the use of contaminated aggregate in the original concrete mix.Destroy the structural integrity of steel
reinforced concrete structures.Cathodic protection can eliminate costly cycle
of concrete repairs and repeated assessments due to corrosion.
Cathodic Protection
PROTECTED STEEL
Mains Power Source
DATA OUTPUT
METERS
COMPUTER CONTROL
DC Power Supply Monitoring Unit
Signal
ANODECABLING CATHODE
CABLINGSIGNAL
CABLING
CONNECTIONS
ANODE SYSTEM CONCRETE(Electrolyte)
REFERENCEELECTRODE
CONNECTIONS