Corrosion Behavior of Cr Micro-alloyed Corrosion-resistant Rebar in Neutral Cl^--containing Environment  

作　　者：Dan SONG Wei SUN Jin-yang JIANG Han MA Jian-chun ZHANG Zhao-jun CHENG 

机构地区：[1]School of Material Science and Engineering,Southeast University [2]Nantong Ocean and Coastal Engineering Research Institute,Hohai University [3]College of Mechanics and Materials,Hohai University [4]Jiangsu Shagang Group Co.,Ltd.

出　　处：《Journal of Iron and Steel Research International》2016年第6期608-617,共10页

基　　金：Item Sponsored by National Basic Research Program of China(2015CB655100);National Natural Science Foundation of China(51308111;51278098);Postdoctoral Science Foundation of China(2013M531249);Industry-University-Research Cooperative Innovation Fund of Jiangsu Province of China(BY2013091);Postdoctoral Science Foundation of Jiangsu Province of China(1202008C);Applied Research Foundation of Nantong City of Jiangsu Province of China(BK2013001)

摘　　要：A new low-cost corrosion-resistant rebar（HRB400R）was designed and fabricated by Cr micro-alloying.The HRB400 Rrebar 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 HRB400 Rrebar was revealed.According to the corrosion-morphology observation and electrochemical monitoring during the constant immersion corrosion in the 3.5mass% NaCl solution,the HRB400 Rrebar presented alleviated corrosion damage,nobler Ecorr,lower Icorr,and larger Rtvalues,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 HRB400 Rrebar 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.A new low-cost corrosion-resistant rebar（HRB400R）was designed and fabricated by Cr micro-alloying.The HRB400 Rrebar 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 HRB400 Rrebar was revealed.According to the corrosion-morphology observation and electrochemical monitoring during the constant immersion corrosion in the 3.5mass% NaCl solution,the HRB400 Rrebar presented alleviated corrosion damage,nobler Ecorr,lower Icorr,and larger Rtvalues,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 HRB400 Rrebar 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.

关 键 词：alloyed systematically ferrite doping spray alloying grains immersion remarkable FeOOH 

分 类 号：TU511.32[建筑科学—建筑技术科学]