缓蚀剂对混凝土模拟液中HRBF500钢筋耐蚀性的影响  

Effect of Inhibitors on Corrosion Properties of HRBF500 Reinforcement in Simulated Concrete Pore Solution

作　　者：林碧兰[1,2] 徐玉野[3] 

机构地区：[1]厦门理工学院材料科学与工程学院,福建厦门361024 [2]福建省功能材料及应用重点实验室,福建厦门361024 [3]华侨大学土木工程学院,福建厦门361021

出　　处：《建筑材料学报》2016年第6期1082-1087,共6页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51408517;51578255);福建省科技计划重点项目(2014Y0033)

摘　　要：应用动电位极化、交流阻抗谱(EIS)、Mott-Schottky曲线测量及扫描电镜(SEM)观察,研究了缓蚀剂D-葡萄糖酸钠(SD)、苯并三氮唑(BTA)、亚硝酸钠(SN)对含质量分数为3.5%NaCl的模拟混凝土孔隙液(SCP溶液)中细晶高强钢筋(HRBF500钢筋)耐蚀性的影响,并与文献报道的此类缓蚀剂对碳素钢筋的缓蚀效果进行了比较.结果表明:在SCP溶液中添加SD后,HRBF500钢筋的腐蚀过程受到抑制,阻抗增大,钝化膜为n型半导体,载流子密度降低,钢筋表面光整致密;添加BTA后,HRBF500钢筋的各项电化学指标下降,钢筋表面布满腐蚀坑;添加SN后,HRBF500钢筋的腐蚀过程也受到抑制.SD,SN可作为HRBF500钢筋的缓蚀剂;BTA不适合作为HRBF500钢筋的缓蚀剂,不同于其对碳素钢筋的缓蚀作用.The effect of the corrosion inhibitors of sodium D-gluconate（SD）, benzotriazole（BTA） and sodium nitrite（SN） on corrosion properties of fine-grain high-strength reinforcement （HRBF500 reinforcement） in simulated concrete pore solution（SCP solution） containing 3. 5% NaCl（by mass） was investigated using dynamic potential polarization, electrochemical impedance spectroscopy（EIS）, Mott-Schottky curves and SEM techniques. The results show that adding SD to SCP solution, the corrosion processes of HRBF500 reinforcement are inhibited; the impedance value increases; the passivation film displays a typical n-type semiconductor and the carrier density decreases. There are no corrosion pits on the surface of HRBF500 reinforcement. However, the corrosion electrochemical indexes of HRBF500 reinforcement are declined when BTA was added, and a great many of corrosion pits are formed. The corrosion processes of HRBF500 reinforcement are also prohibited when SN was added. SD and SN can be used as the corrosion inhibitors for HRBF500 reinforcement; while BTA is unsuitable, different from that for the plain carbon steel.

关 键 词：HRBF500钢筋 缓蚀剂 模拟混凝土孔隙液 耐蚀性 电化学 

分 类 号：TG174.4[金属学及工艺—金属表面处理]