CORROSION INHIBITORS (1).pptx

CORROSION INHIBITORS (1).pptx

• 1.
  CORROSION INHIBITORS
• 2.
  Type of CorrosionProtection •As per NACE international, “a corrosion inhibitor is a substance when added to an environment, either continuously or intermittently to prevent corrosion by forming a passive film on the metal.” •However, the performance of an inhibitor in concrete is a function of numerous inter-related factors that is difficult to be predicted. Hence formation of the passive layer on the steel is not guaranteed. •Fusion Bonded Epoxy Coating is barrier layer coating which is directly applied to the steel bar surface. Hence, corrosion inhibitors can be described as secondary protection which alone will not ensure corrosion protection to steel bars.
• 3.
  Codal Provisions Corrosion Inhibitoris not recommended for corrosion protection for steel reinforcement bars under Durability Recommendations for Service Life of at Least 100 Years Does not recommend corrosion inhibitors for corrosion protection for steel reinforcement bars for severe environment. IRC 112-2020 Code of practice for concrete road bridges IRC SP 80-2008 Corrosion Resistance
• 4.
  Performance Performance of corrosioninhibitors is not documented much to provide conclusive evidence of its effectiveness. Based of studies and reports, manufacturers suggest different corrosion inhibitor dosage in concrete based on environment factors. However, behavior of these inhibtors also change based on the grade and quality of concrete. Hence it is very difficult to achieve same performance in large valumes of concrete. Hence, corrosion inhibtors are suggested for use in repar works where concrete volume is less. If the corrosion inhibitor dosage is higer or lower than the needed dosage will result in non formation of the passive layer, hence leading to inefficient protection of the steel rebars. Some inhibitors get leached out over an extended period of exposure.
• 5.
  Applications Corrosion Inhibitors canfind application in repair works of small volume as it is difficult to achieve perfect batches of concrete over a large scale.