Effects of Pollutants and Microorganisms on the Absorption of Electrolytic Hydrogen in Iron.

Abstract

The objective of this research is to define conditions under which pollutants, in particular those produced by bacteria such as sulfide end products of the SRB, affect the amount of hydrogen absorbed by iron/ steel. Thiosulfate in neutral solutions enhances the hydrogen evolution reaction (HER) and the hydrogen absorption reaction (HAR) on iron. A concentration of 10mM thiosulfate increases the hydrogen absorption rate by 3 fold. This promoting effect of thiosulfate in neutral solutions is due to its thermodynamic instability and its reduction to hydrogen sulfide. Iodide ion as one of the constituents of seawater has a different behavior towards both the HER and HAR on iron. It inhibits the HER while enhancing the HAR. Analysis of the results using the IPZ model shows that iodide ions inhibit the HER by decreasing its discharge rate constant and the hydrogen surface coverage. On the other hand, iodide ions enhance the HAR by increasing the absorption-desorption constant.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1999
Accession Number
ADA363779

Entities

People

  • H. W. Pickering

Organizations

  • Pennsylvania State University

Tags

DTIC Thesaurus Topics

  • Absorption
  • Anaerobic Bacteria
  • Corrosion
  • Current Density
  • Desorption
  • Environment
  • Equations
  • Hydrogen Sulfides
  • Materials
  • Materials Science
  • Microorganisms
  • Military Research
  • Personal Information Managers
  • Square Roots
  • Steady State
  • Stress Corrosion
  • Sulfides

Readers

  • Electrochemical Engineering/ Fuel Cell Technologies
  • Materials Science and Engineering.