Chloride resistance of Cr-bearing alloy steels in carbonated concrete pore solutions  

作　　者：Jing Ming Jin-jie Shi 

机构地区：[1]Jiangsu Key Laboratory of Construction Materials,School of Materials Science and Engineering,Southeast University,Nanjing 211189,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2020年第4期494-504,共11页矿物冶金与材料学报（英文版）

基　　金：the National Natural Science Foundation of China(No.51678144);the National Basic Research Program of China(No.2015CB655100);the Natural Science Foundation of Jiangsu Province,China(No.BK20161420);Southeast University“Zhongying Young Scholars”.

摘　　要：The effect of carbonation on the chloride resistance of low-carbon steel and two Cr-bearing alloy steels in simulated concrete pore solutions was investigated.The chloride threshold values of steels were determined on the basis of corrosion potential(Ecorr)and polarization resistance(Rp).Moreover,the chloride-induced corrosion behavior of steels was evaluated using electrochemical impedance spectroscopy,cyclic voltammetry,cathodic potentiodynamic polarization,and scanning electron microscopy/energy dispersive X-ray spectroscopy measurements.Alloy steels have higher chloride resistance than low-carbon steel in carbonated and non-carbonated concrete pore solutions.The chloride resistance of alloy steels improves with increasing Cr content.In addition,the chloride resistance of all steels is negatively affected by the carbonation of concrete pore solution,especially for alloy steel with high Cr content in the presence of high chloride content.

关 键 词：alloy steel concrete PORE solution CARBONATION CHLORIDE RESISTANCE ELECTROCHEMICAL measurements 

分 类 号：TU528[建筑科学—建筑技术科学] TG174.3[金属学及工艺—金属表面处理]