Stress corrosion cracking of new 2001 lean-duplex stainless steel reinforcements in chloride contained concrete pore solution: An electrochemical study

摘要

An experimental SCC tests has been performed on 2001 lean-duplex stainless steel (LDSS) and 2205 duplex stainless steel (DSS) reinforcements. Specimens were tested by loads up to 85% of their yield strength and simultaneously exposed to 8% chloride in simulated concrete pore solution. Although the maximum corrosion current density value obtained for 2001 LDSS was three times higher than 2205 DSS, specimens demonstrated passivity. Cycling polarization curve was performed which shows that 2205 DSS does not develop any pit but 2001 LDSS does. Finally, specimens were loaded until failure; fracture surface analysis detected a combination of ductile and brittle fracture mode in 2001 LDSS. Even if 2001 LDSS shows worse SCC performance, it is enough to ensure the nominal service life of reinforced concrete structures with lower cost. (C) 2018 Elsevier Ltd. All rights reserved.