MECHANISM OF NITRITE INHIBITION OF CHLORIDE ATTACK ON REINFORCING STEEL IN ALKALINE AQUEOUS ENVIRONMENTS

Calcium nitrite effectively inhibits corrosion of steel reinforcing bars by chlorides. Polarization curves were made of steel bars in aqueous solutions of varying compositions of Na chloride and Ca nitrite plus Ca hydroxide. Precipitation experiments were conducted with solutions containing Ca chloride, ferrous sulfate, and triethanolamine. Ca nitrite delayed onset of attack when Na chloride was added. Mechanism of attack by chloride ion is discussed. The nitrite ion oxidizes ferrous ions to ferric and thus blocks passage of ferrous ions from the steel.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00941492
• Corporate Authors:

  National Association of Corrosion Engineers

  P.O. Box 1499
  Houston, TX  United States  77001
• Authors:
  • Rosenberg, A M
  • Gaidis, J M
• Publication Date: 1979-11

Media Info

• Features: References;
• Pagination: p. 45-48
• Serial:
  • Materials Performance (MP)
  • Volume: 18
  • Issue Number: 11
  • Publisher: National Association of Corrosion Engineers
  • ISSN: 0094-1492
  • Serial URL: http://www.nace.org/Publications/Materials-Performance/

Subject/Index Terms

• TRT Terms: Alkali; Calcium compounds; Concrete bridges; Corrosion; Corrosion protection; Reinforced concrete; Reinforcement (Engineering); Reinforcing steel
• Old TRIS Terms: Alkalies
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00314833
• Record Type: Publication
• Source Agency: Engineering Index
• Files: TRIS
• Created Date: Jul 22 1980 12:00AM