Abstract
To evaluate the corrosion resistance of a novel stainless steel intended for use within reinforced concrete (RC) structures exposed to aggressive environments, the threshold chloride concentration of three stainless steels (316, 2205, novel 2205) and two carbon steels (HRB400, HRB500) exposed to pore solutions of fresh concrete was experimentally studied by means of electrochemical methods. The effect of steel surface state on the corrosion resistance was also experimentally investigated. The results showed that the novel stainless steel has a much higher corrosion resistance than those of the carbon steels and stainless steels when subjected to chloride environments. The presence of surface damage leads to significant decrease of corrosion resistance for carbon steel, however the corrosion can be certainly inhibited with the accumulation of rust on the steel surface. Although the oxide layer was worn, the novel 2205 stainless steel still has a great corrosion resistance.
Highlights
Reinforced concrete (RC) structures are one of the most affordable structures used globally.conventional RC structures have poor durability, especially under severe corrosion conditions, such as ocean, de-icing, or other chloride-contaminated environments
Considering the issues associated with corrosion, the use of stainless-steel reinforcement appears to be the most appropriate solution to increase the durability of RC structures existing in aggressive environments [2,3,4,5,6]
The use of stainless steels can essentially improve the corrosion resistance of embedded bars; this is because the alloying elements of chromium, nickel, and molybdenum can result in the formation of a more stable oxide layer, which protects the metallic matrix beneath the film from chloride corrosion [7,8]
Summary
Reinforced concrete (RC) structures are one of the most affordable structures used globally.conventional RC structures have poor durability, especially under severe corrosion conditions, such as ocean, de-icing, or other chloride-contaminated environments. Considering the issues associated with corrosion, the use of stainless-steel reinforcement appears to be the most appropriate solution to increase the durability of RC structures existing in aggressive environments [2,3,4,5,6]. The use of stainless steels can essentially improve the corrosion resistance of embedded bars; this is because the alloying elements of chromium, nickel, and molybdenum can result in the formation of a more stable oxide layer, which protects the metallic matrix beneath the film from chloride corrosion [7,8]. The use of stainless steels increases the cost of the construction phase, and their use is limited [9]. Based on the results of life-cycle cost analysis, the use of stainless steel is considered to be a more economical alternative
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