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Related Concept Videos

Corrosion02:49

Corrosion

29.0K
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...
29.0K
Corrosion of Reinforcement01:27

Corrosion of Reinforcement

633
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.
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...
633
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

17
Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
17

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Related Experiment Video

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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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Defects Mediated Corrosion in Graphene Coating Layer.

Jincheng Lei1, Yaowu Hu, Zishun Liu1

  • 1International Center for Applied Mechanics, State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University , Xi'an 710049, China.

ACS Applied Materials & Interfaces
|March 21, 2017
PubMed
Summary
This summary is machine-generated.

Graphene coatings offer short-term corrosion protection but long-term defects, especially at grain boundaries, accelerate metal corrosion. Sulfur and oxygen impurities worsen graphene

Keywords:
corrosiondefectsfirst-principlesgrapheneprotective barrier

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Area of Science:

  • Materials Science
  • Surface Engineering
  • Corrosion Science

Background:

  • Graphene coatings show promise for metal anticorrosion due to low gas permeability.
  • However, galvanic effects and defects in graphene can lead to accelerated long-term corrosion.
  • Oxidizing species can permeate through graphene defects, compromising protective properties.

Purpose of the Study:

  • To investigate the role of defects in graphene coatings on metal anticorrosion.
  • To analyze the thermodynamic stability of sulfur (S) and oxygen (O) absorption at graphene grain boundaries.
  • To understand how impurities affect graphene's mechanical and chemical stability under reactive conditions.

Main Methods:

  • First-principles theoretical modeling using density functional theory (DFT).
  • Analysis of S and O absorption thermodynamics on graphene grain boundaries.
  • Experimental observations of oxidized product distribution in reactive environments.

Main Results:

  • Oxidized products were observed to concentrate along graphene grain boundaries.
  • Energetically favorable insertion of S and O at graphene vacancy sites, particularly grain boundaries.
  • Interstitial S and O impurities significantly reduce graphene's mechanical strength and chemical stability, promoting corrosion.

Conclusions:

  • Graphene grain boundary defects are critical pathways for corrosive species.
  • Impurities like S and O at these defects destabilize graphene, accelerating substrate corrosion.
  • Understanding and mitigating defects are crucial for effective long-term graphene-based anticorrosion strategies.