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Corrosion resistance of low-nickel duplex stainless steel rebars
Corrosion resistance of stainless steel reinforcing bars in chloride bearing concrete does depend on the chemical composition and microstructure of the steel. The role of the different alloy elements is complex and simple parameters such as the PREN (pitting resistance equivalent number) are not reliable in order to rank the corrosion resistance of stainless steels in alkaline environments. Duplex stainless steels 1.4362 and 1.4162, with low nickel and molybdenum content, showed a lower corrosion resistance, and a lower chloride threshold, compared to traditional austenitic stainless steels in mild exposure condition, in spite they have a higher value of PREN. This may be attributed to a positive influence of nickel on the corrosion resistance of stainless steels in concrete. 1.4162 showed the lowest corrosion resistance in solution and in concrete, probably due to the negative effect of the high manganese content. The comparison of different types of tests showed that the testing procedure may have a great influence on the evaluation of the chloride threshold level and may also affect the ranking of the corrosion resistance of stainless steels.
Corrosion resistance of low-nickel duplex stainless steel rebars
Corrosion resistance of stainless steel reinforcing bars in chloride bearing concrete does depend on the chemical composition and microstructure of the steel. The role of the different alloy elements is complex and simple parameters such as the PREN (pitting resistance equivalent number) are not reliable in order to rank the corrosion resistance of stainless steels in alkaline environments. Duplex stainless steels 1.4362 and 1.4162, with low nickel and molybdenum content, showed a lower corrosion resistance, and a lower chloride threshold, compared to traditional austenitic stainless steels in mild exposure condition, in spite they have a higher value of PREN. This may be attributed to a positive influence of nickel on the corrosion resistance of stainless steels in concrete. 1.4162 showed the lowest corrosion resistance in solution and in concrete, probably due to the negative effect of the high manganese content. The comparison of different types of tests showed that the testing procedure may have a great influence on the evaluation of the chloride threshold level and may also affect the ranking of the corrosion resistance of stainless steels.
Corrosion resistance of low-nickel duplex stainless steel rebars
Der Korrosionswiderstand von rostfreiem Duplex-Bewehrungsstahl mit geringem Nickelgehalt
Bertolini, L. (author) / Gastaldi, M. (author)
Materials and Corrosion ; 62 ; 120-129
2011
10 Seiten, 13 Bilder, 3 Tabellen, 31 Quellen
Article (Journal)
English
Corrosion resistance of low-nickel duplex stainless steel rebars
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