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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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Abrasion resistance is an essential characteristic of concrete that determines its durability and longevity under various wear conditions. Concrete surfaces are vulnerable to different types of abrasion. For instance, surfaces may wear down due to the constant movement of vehicles or be eroded by solids carried in water, as seen in concrete canal linings. Specific tests are conducted to measure the abrasion resistance of concrete.
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  11. Advanced Nodular Thin Dense Chromium Coating: Superior Corrosion Resistance

Advanced Nodular Thin Dense Chromium Coating: Superior Corrosion Resistance

Ehsan Rahimi1, Thijs Nijdam2, Adwait Jahagirdar2

  • 1Department of Materials Science and Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands.

ACS Applied Materials & Interfaces
|January 22, 2025

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View abstract on PubMed

Summary
This summary is machine-generated.

Advanced chromium-based functional coatings (CFCs) show superior corrosion resistance due to their unique microstructure. This study details how thin dense chromium (TDC) coatings prevent degradation in harsh environments.

Area of Science:

  • Materials Science
  • Corrosion Engineering
  • Surface Engineering

Background:

  • Chromium-based functional coatings (CFCs) offer excellent wear and corrosion resistance but can degrade in aggressive conditions.
  • Existing CFCs face limitations in highly corrosive environments despite microstructural improvements.

Purpose of the Study:

  • To characterize the corrosion resistance of advanced CFCs, specifically a 5 μm thin dense chromium (TDC) coating.
  • To investigate the microstructural features contributing to the enhanced corrosion performance of TDCs.

Main Methods:

  • Fabrication and characterization of a 5 μm TDC coating.
  • Electrochemical testing in aqueous NaCl electrolyte to assess corrosion resistance.
  • Microstructural analysis of the TDC coating and its oxide layer.
Keywords:
Compact bilayer oxideCorrosion protectionElectroplated coatingNear-nanocrystalline structure

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Main Results:

  • TDC coatings exhibit a uniform nodular microstructure with near-nanocrystalline grains (227 ± 75 nm).
  • The coating promotes rapid formation of a stable, dense bilayer oxide, enhancing electrochemical nobility.
  • Significantly low corrosion susceptibility was observed, with impeded charge/mass transport and sustained high polarization resistance.

Conclusions:

  • The unique microstructure of TDC coatings provides exceptional corrosion resistance in aggressive environments.
  • These findings are crucial for designing CFCs with improved durability for extreme conditions.
  • The study highlights the potential of TDCs for applications requiring robust anti-corrosion performance.
Thin dense chromium