Hydrogen deposition as a rate determining step in metal corrosion

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During metal corrosion when hydrogen deposition is the cathodic process, the very first step of the cathodic process is deposition of adsorbed hydrogen atoms (Volmer reaction) onto the corroding metal surface. This is followed by formation of adsorbed hydrogen molecules (Tafel reaction), which then desorb and diffuse into the bulk of the electrolyte: H+ + e ↔ Ha ↔ H2ads ↔ H2,surf ↔ H2,sol The atomic hydrogen deposition and the formation of H2 molecules is a catalytic process in any medium. There is no equilibrium between H2 molecules and H+ or water molecules without some catalyst being present.

Original languageEnglish
Pages (from-to)183-192
Number of pages10
JournalCorrosion Reviews
Issue number3
Publication statusPublished - Jun 2004

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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