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Corrosion of Reinforcement01:27

Corrosion of Reinforcement

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The corrosion of steel reinforcement within concrete is a process influenced by the material's inherent properties and external factors. The high pH level of around 13, provided by calcium hydroxide present in concrete, initially protects the steel reinforcement by promoting the formation of a passive iron oxide layer on its surface.
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The degradation of metals due to natural electrochemical processes is known as corrosion. Rust formation on iron, tarnishing of silver, and the blue-green patina that develops on copper are examples of corrosion. Corrosion involves the oxidation of metals. Sometimes it is protective, such as the oxidation of copper or aluminum, wherein a protective layer of metal oxide or its derivatives forms on the surface, protecting the underlying metal from further oxidation. In other cases, corrosion is...
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When acids come into contact with concrete, they initiate a chemical reaction that dissolves the hydrated cement paste. This process leads to softening and structural weakening of the concrete. This issue is commonly observed in environments such as chimneys, sewers, and industrial settings. The severity of the damage increases as the pH of the water interacting with the concrete drops below 6.5. In particular, a pH under 4.5 can cause significant concrete damage.
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Concrete's susceptibility to water absorption is due to the capillary action within the pores of its hydrated cement paste. This action draws water in, creating the need for waterproofing admixtures to prevent such penetration. The efficacy of these admixtures is contingent upon the water pressure, with variations arising from different conditions such as rain, capillary rise, or hydrostatic pressure in structures intended to hold water.
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Sulfate Attack on Concrete01:29

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Sulfate attack on concrete is a deterioration process characterized by a whitish discoloration beginning at the edges and corners, accompanied by cracking and spalling. This phenomenon occurs when sulfates react with the components of hardened concrete, forming compounds like calcium sulfate and calcium sulfoaluminate which occupy more space than the substances they replace, causing the concrete to expand and disrupt.
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Corrosion-Responsive Self-Healing Coatings.

Tiwa Yimyai1, Daniel Crespy1, Michael Rohwerder2

  • 1Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong, 21210, Thailand.

Advanced Materials (Deerfield Beach, Fla.)
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Summary
This summary is machine-generated.

Organic coatings protect metals from corrosion. Advanced self-healing coatings require understanding corrosion stimuli and agent transport for optimized performance.

Keywords:
anticorrosionresponsive coatingsself-healingsmart coatingsstimuli-responsive materials

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Area of Science:

  • Materials Science
  • Corrosion Engineering
  • Polymer Chemistry

Background:

  • Organic coatings are widely used for metal corrosion protection due to their flexibility and cost-effectiveness.
  • Self-healing organic coatings represent an emerging research area, heavily relying on responsive materials.
  • Current research often focuses on responsive materials and active agents, potentially overlooking critical aspects of coating-stimuli interaction.

Purpose of the Study:

  • To discuss the requirements and possibilities for designing materials for self-healing organic coatings.
  • To highlight the importance of understanding stimuli-induced reactions, stimulus spread, and agent transport within coatings.
  • To bridge the gap between material design and practical application for enhanced corrosion protection.

Main Methods:

  • Review of existing literature on organic coatings and self-healing mechanisms.
  • Analysis of requirements from both corrosion science and material synthesis perspectives.
  • Discussion of stimuli-responsive materials and active agent delivery systems.

Main Results:

  • Identified the need for a holistic approach beyond just responsive materials.
  • Emphasized the critical role of understanding the dynamic interplay between corrosion stimuli and the coating matrix.
  • Highlighted the importance of efficient transport pathways for self-healing agents to defect sites.

Conclusions:

  • Designing high-performance self-healing coatings necessitates a deeper understanding of corrosion-induced stimuli and their propagation within the coating.
  • Optimizing material design requires considering how coatings react to and interact with their corrosive environment.
  • Future advancements depend on integrating knowledge of corrosion mechanisms with advanced material synthesis for targeted self-healing applications.