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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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Area of Science:

  • Materials Science
  • Corrosion Science
  • Nanotechnology

Background:

  • Graphene's impermeability and inertness suggest superior corrosion protection for metals.
  • However, prior studies show limited or even detrimental effects of graphene on metal corrosion.
  • The underlying reasons for graphene's low corrosion inhibition efficiency require investigation.

Purpose of the Study:

  • To identify the origin of limited corrosion inhibition by graphene on metal surfaces.
  • To develop strategies for achieving reliable and complete corrosion passivation using graphene.
  • To evaluate the effectiveness of defect passivation for enhancing graphene's protective properties.

Main Methods:

  • Electrochemical characterization techniques were employed to assess corrosion behavior.
  • Morphological analysis was used to examine graphene structure and defects.
  • Atomic layer deposition (ALD) was utilized for selective passivation of graphene defects.

Main Results:

  • Nanometer-sized structural defects in chemical vapor deposition (CVD) grown graphene were identified as the cause of low passivation.
  • High mass transport rates across and parallel to graphene layers contribute to limited inhibition efficiency (∼50%) for copper.
  • Selective defect passivation via ALD resulted in enhanced corrosion protection exceeding 99%.

Conclusions:

  • Structural defects are the primary limitation for graphene's corrosion protection.
  • Atomic layer deposition (ALD) effectively passivates these defects, enabling superior corrosion resistance.
  • This defect passivation strategy offers a promising alternative to commercial corrosion protection methods.