碳化作用下柠檬酸和水玻璃对硫氧镁水泥中钢筋锈蚀行为的影响  

Effect of Citric Acid and Sodium Silicate on Corrosion Behavior of Steel Bars in Magnesium Oxysulfate Cement under Carbonization

作　　者：周书夙 俞高科 徐之睿 邱月[1] 冯凯乐 薛涛 巴明芳[1] ZHOU Shusu;YU Gaoke;XU Zhirui;QIU Yue;FENG Kaile;XUE Tao;BA Mingfang(School of Civil and Environmental Engineering,Ningbo University,Ningbo 315211,China)

机构地区：[1]宁波大学土木与环境工程学院,浙江宁波315211

出　　处：《材料保护》2023年第12期50-57,共8页Materials Protection

基　　金：国家自然科学基金(51978346)资助。

摘　　要：为了探究碳化作用下柠檬酸(CA)和水玻璃(SS)分别对改性硫氧镁(MOS)水泥基材料中钢筋的锈蚀行为的影响,采用电化学交流阻抗法和钢筋锈蚀仪,测试了分别加入占氧化镁质量分数为0.5%的CA、SS以及CS(CA与SS以1:2质量比复合)的MOS水泥基材料时在碳化作用下内置钢筋的锈蚀速率和锈蚀程度。结果表明:在碳化作用下,添加CA降低了MOS水泥基材料中钝化钢筋和脱钝钢筋的锈蚀速率和锈蚀程度,其中单掺CA对MOS水泥基材料中的钝化钢筋和脱钝钢筋的阻锈效果最好,单掺SS对MOS水泥基材料中的钝化钢筋没有阻锈作用,而掺加CS对MOS水泥基材料中的脱钝钢筋的阻锈效果一般,对钝化钢筋没有明显的阻锈效果。In order to explore the effects of citric acid(CA)and water glass(SS)on the corrosion behavior of steel bars in modified magnesi-um oxysulfide(MOS)cement-based materials under carbonization,the corrosion rate and degree of embedded steel bars under carbonization in MOS cementitious materials with CA,ss,and CS(CA and ss ina 1:2 mass ratio)added at 0.5%mass percent of magnesium oxide,respee-tively,were tested using electrochemical impedance spectroscopy and steel bar corrosion tester.Results showed that under carbonization,the addition of CA reduced the corrosion rate and degree of passivated and depassivated steel bars in MOS cementtious materials.Among them,the single addition of CA had the best rust inhibition ffet on the passivated and depassivated steel bars in M0S cementitious materials.The single addition of ss had no rust inhibition efeet on the passivated steel bars in MOS cementitious materials,while the addition of CS had a general rust inhibition efect on the depassivated steel bars in MOS cementitious materials,and no signifcant rust inhibition effect on the passivated steel bars.

关 键 词：改性MOS水泥 电化学测试 钢筋锈蚀 化学外加剂 碳化 

分 类 号：TV431[水利工程—水工结构工程]