Corrosion products of reinforcement in concrete in marine and industrial environments

ROSA DE LAS MERCEDES VERA ARAVENA, M. Villarroel, A. M. Carvajal, E. Vera, C. Ortiz

Research output: Contribution to journalArticlepeer-review

59 Scopus citations

Abstract

The corrosion products formed on embedded steel in concrete under simulated marine and industrial conditions and natural marine environment were studied. A 0.50 water/cement ratio concrete was used and 3.5% NaCl and 180 g L-1 of H2SO4 with 70 ppm of chloride ions solutions were used to simulate the synthetic medium. The initial electrochemical variables of the steel and pH, chlorides and sulfates profiles were measured according to the concrete depth. The morphology of the corrosive attack was determined via scanning electron microscopy (SEM), and the composition of the corrosion products was determined using an X-ray analyzer and an X-ray diffractometer (XRD). The protective power of the corrosion products was evaluated through anodic polarization curves in a saturated Ca(OH)2 solution. The results from XRD and SEM show that all the resulting corrosion products correspond to lepidocrocite, goethite and magnetite mixtures; moreover, akaganeite was also identified under natural and simulated marine environments. Siderite was only detected in samples exposed to a natural marine environment. Concerning the protective nature of the corrosion products, these show lower performance in a simulated industrial environment, where the corrosion rate of the steel is up to 1.48 μm year-1.

Original languageEnglish
Pages (from-to)467-474
Number of pages8
JournalMaterials Chemistry and Physics
Volume114
Issue number1
DOIs
StatePublished - 15 Mar 2009
Externally publishedYes

Keywords

  • Corrosion
  • Corrosion products
  • Industrial environment
  • Marine environment
  • Reinforced concrete
  • Steel

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