摘要
采用X射线光电能谱仪(XPS)研究了NaNO_2对含氯盐砂浆内钢筋钝化膜微结构的影响,阐明了亚硝酸盐阻锈作用下砂浆内钢筋钝化膜的微结构变化规律及其特征.研究结果表明:NaNO_2在碱性环境下与Fe元素反应生成中间产物Na_2FeO_2和(NaFeO_2)_2,进一步促进Fe_3O_4的生成,提高了阻锈效果;NaNO_2的掺入促进了反应式向正向移动,提高了钝化膜中Fe_3O_4的含量;当普通碳钢钝化膜内5nm处Fe^(3+)/Fe^(2+)的百分比大于表层的Fe^(3+)/Fe^(2+)百分比时,钝化膜内部的致密性优于表面.NaNO_2不参与钝化膜的组成,但参与生成钝化膜的反应过程,该反应过程为缓慢的动态平衡过程,可通过改变反应物的含量控制钝化膜厚度.
The effects of NaNO 2 on the passivation film were studied through X-ray photoelectron spectroscopy(XPS)in the chloride environment of the mortar.The microstructural variation and characteristics of the passivation film of mortar in this condition were clarified.The results show that the intermediate products Na 2FeO 2 and(NaFeO 2)2 are formed at the reaction of NaNO 2 with Fe in alkaline environment,which promote the formation of Fe 3 O 4 and enhance the effect of rust.The increase of NaNO 2 content can promote the forward reaction process so as to increase the content of Fe 3 O 4 in the passivation film.The percentage of Fe 3+/Fe 2+on the surface of the passivation film is lower than that of Fe 3+/Fe 2+at 5 nm.That is to say,the internal density of the passivation film of steel is denser than that of the surface.
作者
柳俊哲
耿俊迪
巴明芳
贺智敏
李玉顺
LIU Junzhe;GENG Jundi;BA Mingfang;HE Zhimin;LI Yushun(Faculty of Architectural Civil Engineering and Environment,Ningbo University,Ningbo 315211,China)
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2018年第4期536-541,共6页
Journal of Building Materials
基金
国家自然科学基金资助项目(51478227
51778302)
关键词
亚硝酸盐
砂浆
钝化膜
X射线光电能谱
微结构
nitrite
mortar
passivation film
X-ray photoelectron spectroscopy(XPS)
microstructure
