Institutional RepositoryThis is a postprint version of the following published document:A. Bautista (et al.).
HI GHLIGHTS• 5 corrugated stainless steel grades are studied in chloride contaminated mortars.• Ecorr and E IS are used for monitoring, and polarizations tests are also carried out • Spo ntaneous corrosion only appears in low Ni austenitic 520430 at partial immersion.• 532205 duplex does not show any sign of corrosion even at anodic high polarizations.
ABSTRA C T
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Stainless steel Steel reinforced mortar EISMortar sampl es reinforced with 5 different corrugated stainless steels were tested for 9 years in 2 differ ent conditions: partial immersion (P I) in 3. 5% NaC l, and chloride addition to the mortar and exposure to high relative humidity (H R H) . The monitoring during the exposures was carried out with corrosi on potential (Ecorr) and electrochemical impedance spectroscopy (E IS) measurements. A year before finishing (after 8 years of exposure), the reinforced mortar samples were anodically polarised to obtain more infor mation about the pitting resistance of the passi ve layers formed under the different conditions. The last year of exposure was established to study the pr ogress or repassivation of the pits. The P I is the most aggressive testing condition and it causes low intensity corrosion in 520430 austenitic stainless steel after 7 years of exposure. The 532205 duplex stainless steel shows very good corrosion behaviour.