科研之友
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摘要
Steel reinforced concrete has the potential to withstand a variety of adverse environmental conditions. Nowadays, corrosion in reinforced concrete is highly regarded due to the durability of the structures. In this research, concrete cubes containing 50 wt.% Limestone and reinforced with 316L austenitic and 2304 duplex stainless steels were subjected to study on corrosion behavior in 0.5 M H2SO4 solution using open-circuit potential and electrochemical impedance spectroscopy techniques. The corrosion current density of the 316L austenitic and 2304 duplex steels were 0.052 and 0.063 mu A/cm(2), respectively, which determined by potentiodynamic polarization diagrams. These results show that both steel reinforced concretes remained completely in the passive state during the test which indicates their good corrosion resistance in the acidic environment. Niquist diagram of the 316L austenitic stainless steel rebar indicates only an incomplete capacitive semi-circle, indicating the formation of a passive layer with a high protective property.An inductive behavior at high frequency was observed for 2304 duplex steel. Scanning electron microscope image indicates that 316L austenitic stainless steel surface was without evidence of pores/defects and unevenness which can reduce the influence of aggressive ions and moisture on the surface.
