Electrochemical corrosion behavior of HRB500 steel bar in simulated concrete pore solutions
The electrochemical corrosion behavior of HRB500 steel bar in Simulated Concrete Pore (SCP) solutions contaminated by bicarbonate ions and (or) chloride ions was investigated by cyclic potentiodynamic polarization technique, and it was compared with that of HPB235 steel bar. The results show that the passivation and repassivation of HRB500 steel bar is remarkably in the conditions where pH is 12.5 and w (NaCl) is 0~0.1%, or pH is 11.5 and w(NaCl) is no more than 0.01%, or pH is 10.5 and w(NaCl) is less than 0.005%. These are almost similar to that of HPB235 steel bar. However, with the increase of the aggressivity of SCP solutions, the corrosion susceptibility of HRB500 to pH and chloride ions is greatly higher than that of HPB235. The threshold value of chloride ions is considerably decreased with the increase of carbonization. If the connection of HRB500 and HPB235 was exposed to the aggressive environments, HRB500 is anode which is corroded acceleratedly, and HPB235 steel bar is cathode.
HRB500 steel bar corrosion simulated concrete pore solution polarization
Bilan Lin Yuye Xu
Department of Mechanical Engineering Xiamen University of Technology Xiamen Fujian, China College of Civil Engineering Huaqiao University Xiamen Fujian, China
国际会议
哈尔滨
英文
2328-2332
2011-08-12(万方平台首次上网日期,不代表论文的发表时间)