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Intermolecular Forces in Solutions02:28

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Kohlrausch's law explains that at infinite dilution, where dissociation is complete, each ion's contribution to the conductivity of the electrolyte is independent of the nature of other ions present in the solution. It also implies that when an electrolyte is highly diluted, the conductance of the electrolyte is the sum of the individual conductances of the ions it generates upon dissociation. The quantity of electricity an ion carries is proportional to its molar ionic conductance, which...
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Thermochemical Studies of Ni(II) and Zn(II) Ternary Complexes Using Ion Mobility-Mass Spectrometry
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Mn ion dissolution from MnS: a density functional theory study.

Y J Wang1, P Hu, X L Ma

  • 1Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Wenhua Road 72, 110016 Shenyang, China.

Physical Chemistry Chemical Physics : PCCP
|September 6, 2013
PubMed
Summary
This summary is machine-generated.

The dissolution of manganese sulfide (MnS) inclusions in stainless steel is a slow, three-step process with significant energy barriers. This atomic-level understanding of MnS dissolution is crucial for preventing pitting corrosion.

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Area of Science:

  • Materials Science
  • Corrosion Science
  • Computational Chemistry

Background:

  • Manganese sulfide (MnS) inclusions in stainless steels can initiate pitting corrosion.
  • The atomic-scale dissolution mechanism of MnS is not well understood.
  • Understanding this mechanism is key to developing corrosion-resistant stainless steels.

Purpose of the Study:

  • To investigate the atomic-scale mechanism of MnS dissolution.
  • To simulate the process of a manganese (Mn) ion leaving the MnS surface.
  • To elucidate the rate-limiting steps in MnS dissolution.

Main Methods:

  • Ab initio molecular dynamics (AIMD) calculations were employed.
  • The simulation focused on the detachment of a single Mn ion from the MnS surface.
  • Reaction pathways and energy barriers were analyzed.

Main Results:

  • The Mn ion dissolution from MnS occurs via a three-step reaction mechanism.
  • Two significant energy barriers were identified, indicating slow dissolution steps.
  • Mn ion dissolution barriers are substantially higher than those for sodium (Na) ion dissolution from sodium chloride (NaCl).

Conclusions:

  • The dissolution of MnS is a kinetically controlled process with rate-limiting barriers.
  • Differences in electronic structure explain the higher dissolution barriers for Mn ions compared to Na ions.
  • This study provides fundamental insights into MnS dissolution relevant to stainless steel corrosion.