Influence of the C-S-H Amount on [Cl^-]/[OH^-]Ratio of Simulated Concrete SPS and the Corrosion Susceptibility of Steel

作     者：唐聿明 DUN Yuchao MIAO Yongfa ZHAO Xuhui ZUO Yu 

作者机构：Beijing Key Laboratory of Electrochemical Process and Technology for MaterialsBeijing University of Chemical Technology 

出 版 物：《Journal of Wuhan University of Technology(Materials Science)》 (武汉理工大学学报（材料科学英文版）)

年 卷 期：2017年第32卷第2期

页      面：430-436页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：Funded by the National Natural Science Foundation of China(Nos.51171014 and 51210001) 

主　　题：C S H concrete SPS [Cl^ ]/[OH^ ] corrosion carbon steel 

摘      要：Two kinds of simulated concrete pore solutions（SPSs） were treated with different amounts of synthetic calcium silicate hydrate（C-S-H）. The variation of the [Cl^-]/[OH^-] ratio in SPS was measured and the corrosion susceptibility of carbon steel in the SPS was investigated with potentiodynamic polarization, EIS and weight lose tests. The experimental results showed that for the SPS at p H 12.5, as the amount of C-S-H increases, the [Cl^-]/[OH^-] ratio increases thereby causing an increase in the corrosion susceptibility of the steel. While for the SPS at p H 9.7, with increasing C-S-H amount, the drop amplitudes of both [Cl^-]/[OH^-] ratio and steel corrosion rate first decrease and then increase, and a 3% C-S-H addition shows the best inhibition effect. XPS results demonstrate that after C-S-H treating in p H 12.5 SPS the [Fe^（3＋）]/[Fe^（2＋）] ratio in the film on steel surface is reduced while in p H 9.7 SPS the [Fe^（3＋）]/[Fe^（2＋）] ratio is increased. The different effects of the C-S-H amount on the two SPSs and the steel corrosion behavior result from the influences of C-S-H on the SPS p H, which is related to the composition of the SPS.