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Related Concept Videos

Corrosion02:49

Corrosion

24.7K
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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Colloidal precipitates01:09

Colloidal precipitates

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Preparation of Samples for Electron Microscopy01:20

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To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...
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Washing, Drying, and Ignition of Precipitates00:52

Washing, Drying, and Ignition of Precipitates

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After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
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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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Determining the Chemical Composition of Corrosion Inhibitor/Metal Interfaces with XPS: Minimizing Post Immersion Oxidation
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Corrosion-driven droplet wetting on iron nanolayers.

Aurelien Ricard1, Frederic Restagno1, Yun Hee Jang1,2,3

  • 1Laboratoire de Physique des Solides, Université Paris-Saclay, CNRS, 91405, Orsay Cedex, France.

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|October 25, 2023
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Corrosion-induced droplet spreading on iron nanolayers was observed, revealing merging pits that formed a corrosion front. This front drove non-radial spreading, extending beyond the electrolyte droplet, offering new insights into nanoscale electrochemical wetting.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Surface Science

Background:

  • The classical Evans' drop experiment involves an aqueous salt solution on a metal surface, leading to pit formation and oxide deposits due to metal dissolution.
  • Understanding corrosion-induced droplet dynamics is crucial for predicting material degradation and designing protective coatings.

Purpose of the Study:

  • To investigate corrosion-induced droplet spreading on iron nanolayers using optical methods.
  • To elucidate the relationship between corrosion propagation, electrolyte droplet behavior, and substrate properties at the nanoscale.

Main Methods:

  • Utilized semi-transparent iron nanolayers to enable simultaneous optical monitoring of iron corrosion and electrolyte droplet dynamics.
  • Observed pit growth, merging into a corrosion front, and its interaction with the droplet's triple contact line.

Main Results:

  • Corrosion pits grew and merged under the droplet, forming a distinct corrosion front that reached the triple contact line.
  • The corrosion front initiated non-radial spreading of the droplet, eventually propagating beyond the immobile electrolyte.
  • Chemically-active wetting was observed only on conductive substrates with strong iron nanofilm adhesion; weaker spreading was noted on thick iron films.

Conclusions:

  • Corrosion-driven electrochemical reactions can induce significant wetting phenomena at the nanometer scale, altering droplet behavior.
  • The findings suggest new perspectives on substrate wetting influenced by corrosion processes, particularly in systems with conductive substrates and nanofilms.
  • Further research is needed to fully explore the implications of these nanoscale electrochemical wetting behaviors.