海水海砂混凝土中低合金钢筋钝化膜结构及厚度预测模型  

Study on the Structure and Thickness Prediction Model of Passivation Film for Low-alloy Steel Reinforcement in Seawater Sea-sand Concrete

作　　者：潘杜 牛荻涛[1] 罗大明[1] PAN Du;NIU Ditao;LUO Daming(Department of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,西安710055

出　　处：《材料导报》2025年第6期136-143,共8页Materials Reports

基　　金：国家自然科学基金(52078413);深圳市重大科技项目(CJGJZD20220517141806015);西安建筑科技大学优秀博士学位论文培育基金(2023XYBPY008)。

摘　　要：本工作采用电化学手段监测海水海砂混凝土中普通钢筋(OS)和低合金钢筋(LS)钝化膜的形成过程,通过XPS刻蚀技术分析钝化膜的物相组成、结构及厚度,并建立钝化膜厚度预测模型。研究结果表明:海水海砂混凝土中OS和LS均能形成稳定钝化膜;OS钝化膜为主要由Fe的氧化物/氢氧化物构成的双层结构,LS钝化膜除Fe的氧化物/氢氧化物外,还存在Cr的氧化物/氢氧化物,为三层结构,但两种钢筋钝化膜厚度相差较小。Electrochemical methods were employed to monitor the passivation behavior of ordinary steel reinforcement(OS)and low-alloy steel rein-forcement(LS)in seawater sea-sand concrete(SSC).The X-ray photoelectron spectroscopy(XPS)was utilized to analyze the phase composition,structure,and thickness of the passivation film,along with the development of a prediction model for passivation film thickness.Ex-perimental results reveal that the passivation film on OS primarily consisted of a dual-layer structure composed of Fe oxides/hydroxides,while the passivation film on LS featured a triple-layer structure with the addition of Cr oxides/hydroxides alongside Fe oxides/hydroxides.Nonetheless,the thickness of the passivation film between the two types of steel bars is relatively equal.

关 键 词：耐久性 海水海砂混凝土 低合金钢筋 钝化 

分 类 号：TU528.59[建筑科学—建筑技术科学]