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Related Concept Videos

Corrosion02:49

Corrosion

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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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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.
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...
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Precipitation of Ions03:11

Precipitation of Ions

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Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
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Types of Coprecipitation01:10

Types of Coprecipitation

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Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
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Interfacial Electrochemical Methods: Overview01:06

Interfacial Electrochemical Methods: Overview

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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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The Sulfur Cycle01:22

The Sulfur Cycle

43.4K
Sulfur, an important element in the chemical makeup of proteins, is recycled through the atmosphere and aquatic and terrestrial environments. Found in the atmosphere as sulfur dioxide (SO2), sulfur is released by decaying organisms, weathered rocks, geothermal vents, volcanos, and burning fossil fuels. It is deposited into the ecosystem, cycled through the biotic community, and either released back into the atmosphere as gas or deposited in marine sediment for long-term storage and eventual...
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Complexity at a Humid Interface: Throwing Fresh Light on Atmospheric Corrosion.

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Water vapor causes metal corrosion, but surface carbon contamination complicates this process. New research shows micropore filling and capillary condensation on carbon layers are key factors in atmospheric corrosion mechanisms.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Corrosion Science

Background:

  • Atmospheric corrosion of metals by water vapor is a significant issue in various applications.
  • Existing models often overlook the role of surface contamination in corrosion initiation.

Purpose of the Study:

  • To investigate the interaction of water vapor with zinc surfaces.
  • To understand the influence of surface carbon contamination on water sorption and corrosion.

Main Methods:

  • Near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS).
  • Vibrational sum frequency spectroscopy (VSFS).

Main Results:

  • Water sorption on zinc is complex, involving micropore filling and capillary condensation.
  • An adventitious carbon layer significantly impacts water interaction with the zinc surface.
  • Corrosion initiation may be linked to water condensation within surface carbon features.

Conclusions:

  • Current atmospheric corrosion models need revision to include surface carbon contamination.
  • Understanding water-carbon interactions is crucial for predicting and preventing metal corrosion in humid environments.