Journal
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
Volume 64, Issue 3, Pages 185-194Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/maco.201106488
Keywords
concrete; mild steel; polarisation; Raman spectroscopy; SEM
Funding
- French Commissariat a l'Energie Atomique
- Electricite de France
- ANDRA through the CIMETAL
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This paper deals with the characterisation by means of electrochemical, gravimetric and analytical methods of chloride-induced-corrosion behaviour of steel coupons embedded in chloride-containing-cement pastes. Corrosion rates were estimated from electrochemical measurements as well as gravimetric ones. They vary from 2.6 to 5.7 mu m/year for 5 and 10g/L chloride-containing-cement pastes. Analytical characterisations (including optical and electronical microscopy and Raman micro-spectroscopy) showed that corrosion patterns are not depending on the chloride content of the cement paste (5 and 10g/L chloride in the interstitial solution). A localised corrosion pattern composed of pits growing inside the metallic substratum, a corrosion products layer (CPL) and a transformed medium (TM) was pointed out. CPL can be divided into two sub-layers (CPL1 and CPL2), characterised by the presence or absence of calcium coming from the cement matrix.
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