Corrosion Behavior of Cr Micro-alloyed Corrosion-resistant Rebar in Neutral Cl--containing Environment
Dan SONG1,2,3,Wei SUN1,Jin-yang JIANG1,Han MA4,Jian-chun ZHANG4,Zhao-jun CHENG3
1. School of Material Science and Engineering, Southeast University, Nanjing 210096, Jiangsu, China 2. Nantong Ocean and Coastal Engineering Research Institute, Hohai University, Nantong 226000, Jiangsu,China 3. College of Mechanics and Materials, Hohai University, Nanjing 210098, Jiangsu, China 4. Jiangsu Shagang Group Co., Ltd., Zhangjiagang 215600, Jiangsu, China
Corrosion Behavior of Cr Micro-alloyed Corrosion-resistant Rebar in Neutral Cl--containing Environment
Dan SONG1,2,3,Wei SUN1,Jin-yang JIANG1,Han MA4,Jian-chun ZHANG4,Zhao-jun CHENG3
1. School of Material Science and Engineering, Southeast University, Nanjing 210096, Jiangsu, China 2. Nantong Ocean and Coastal Engineering Research Institute, Hohai University, Nantong 226000, Jiangsu,China 3. College of Mechanics and Materials, Hohai University, Nanjing 210098, Jiangsu, China 4. Jiangsu Shagang Group Co., Ltd., Zhangjiagang 215600, Jiangsu, China
ժҪ A new low-cost corrosion-resistant rebar (HRB400R) was designed and fabricated by Cr micro-alloying. The HRB400R rebar had uniform distribution of Cr element in ferrite grains. The corrosion behavior of the rebar in the neutral Cl--containing environment was studied systematically, and the improved corrosion resistance of the HRB400R rebar was revealed. According to the corrosion-morphology observation and electrochemical monitoring during the constant immersion corrosion in the 3.5 mass% NaCl solution, the HRB400R rebar presented alleviated corrosion damage, nobler Ecorr, lower Icorr, and larger Rt values, and these phenomena were more remarkable in the initial corrosion period. The elevated electrode potential of the rebar, caused by the solid-solution of Cr micro-alloying in the ferrite grains, was the key to the corrosion-resistance improvement. The HRB400R rebar also presented much lower mass-loss rate in the salt spray corrosion test. Besides the elevated corrosion resistance of the matrix, the doping and enrichment of Cr element in the rust layer was another factor for the higher corrosion resistance, which retarded the penetration of aggressive medium through the rust layer.
Abstract��A new low-cost corrosion-resistant rebar (HRB400R) was designed and fabricated by Cr micro-alloying. The HRB400R rebar had uniform distribution of Cr element in ferrite grains. The corrosion behavior of the rebar in the neutral Cl--containing environment was studied systematically, and the improved corrosion resistance of the HRB400R rebar was revealed. According to the corrosion-morphology observation and electrochemical monitoring during the constant immersion corrosion in the 3.5 mass% NaCl solution, the HRB400R rebar presented alleviated corrosion damage, nobler Ecorr, lower Icorr, and larger Rt values, and these phenomena were more remarkable in the initial corrosion period. The elevated electrode potential of the rebar, caused by the solid-solution of Cr micro-alloying in the ferrite grains, was the key to the corrosion-resistance improvement. The HRB400R rebar also presented much lower mass-loss rate in the salt spray corrosion test. Besides the elevated corrosion resistance of the matrix, the doping and enrichment of Cr element in the rust layer was another factor for the higher corrosion resistance, which retarded the penetration of aggressive medium through the rust layer.
��������:National Basic Research Program of China;Natural Science Foundation of China;Industry-University-Research Cooperative innovation fund of Jiangsu Province;China Postdoctoral Science Foundation;Postdoctoral Science Foundation of Jiangsu Province of China;Applied Research Foundation of Nantong city;��Six talent Peak�� Project of Jiangsu Province
Dan SONG,,,Wei SUN,Jin-yang JIANG,Han MA,Jian-chun ZHANG,Zhao-jun CHENG. Corrosion Behavior of Cr Micro-alloyed Corrosion-resistant Rebar in Neutral Cl--containing Environment[J]. �й������ڿ���, 2016, 23(6): 608-617.
Dan SONG,,,Wei SUN,Jin-yang JIANG,Han MA,Jian-chun ZHANG,Zhao-jun CHENG. Corrosion Behavior of Cr Micro-alloyed Corrosion-resistant Rebar in Neutral Cl--containing Environment. Chinese Journal of Iron and Steel, 2016, 23(6): 608-617.
2016, Vol. 23 
