Evaluation of Galvanic Corrosion between Hot Dip Galvanized Steel and Ordinary Steel Rebar in Concrete Environment
Hot dip galvanized steel (GS) rebar has been mainly used to reinforced concrete, which requires longterm durability, because of its anti-corrosion effect by zinc.However, when two rebars which are GS and ordinary steel (OS) with mill scale are in contact with each other, this condition causes a concern of galvanic corrosion between zinc and iron.Despite the concern, few quantitative studies have been carried out regarding area ratio of anode as GS and cathode as OS.In this study, in order to investigate a property of galvanic corrosion between GS and OS, electrochemical experiment (Tafel extrapolation) was carried out in alkaline and carbonated solution, which simulated concrete environment.Specimens were decided in regard to area ratio of GS and OS.Furthermore, the scope of corrosion condition in this study was focused on initial state of GS surface which does not form passivation film.As a result, in alkaline environment, it was found that the galvanic corrosion of GS was considerably influenced by mill scale on OS, because of its resistivity.In carbonated environment, it was found that contacted GS (GS-OS coupled specimen) showed rapid corrosion rate than non-contacted GS.In conclusion, it is proposed that contacted GS in the concrete seems to corrode actively than non-contacted GS, especially in carbonated environment.
Hot dip galvanized steel rebar Ordinary steel rebar Galvanic Corrosion Ratio of Anode and Cathode electrochemical test
H.B.Choe Y.Nishio M.Kanematsu
Department of Architecture, Graduate School of Science and Technology, Tokyo University of Science, Department of Architecture, Faculty of Science and Technology, Tokyo University of Science, 2641,Yam
国际会议
福州
英文
731-738
2018-11-04（万方平台首次上网日期，不代表论文的发表时间）