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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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Metal Corrosion and the Efficiency of Corrosion Inhibitors in Less Conductive Media
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Filiform corrosion as a pressure-driven delamination process.

Fabian Brau1, Stephanie Thouvenel-Romans2, Oliver Steinbock2

  • 1Université libre de Bruxelles (ULB), Nonlinear Physical Chemistry Unit, Faculté des Sciences, CP-231, 1050 Brussels, Belgium. fabian.brau@ulb.ac.be.

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Summary
This summary is machine-generated.

Filiform corrosion creates distinct trails on coated metals by detaching the coating. This study quantitatively models the cross-sectional shape of these corrosion filaments, validating it with experimental data.

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Area of Science:

  • Materials Science
  • Corrosion Science
  • Surface Engineering

Background:

  • Filiform corrosion is a common degradation process affecting coated metals.
  • It is characterized by the formation of long, narrow trails due to coating delamination.
  • Understanding the morphology of these corrosion filaments is crucial for predicting material lifespan.

Purpose of the Study:

  • To quantitatively describe the cross-sectional shape of filiform corrosion filaments.
  • To develop and validate a theoretical model for filiform corrosion dynamics.
  • To investigate the influence of coating thickness on corrosion morphology.

Main Methods:

  • Combined experimental and theoretical analysis.
  • Systematic variation of coating thickness in experiments.
  • Development of a delamination model for filiform corrosion.

Main Results:

  • The study quantitatively characterizes the cross-sectional shape of filiform corrosion filaments.
  • A novel delamination model was introduced and shown to be compatible with experimental findings.
  • Experimental data demonstrated the impact of coating thickness on filament morphology.

Conclusions:

  • The developed delamination model accurately describes filiform corrosion dynamics.
  • The quantitative analysis provides insights into the geometry of corrosion trails.
  • This work contributes to a better understanding and prediction of coated metal degradation.