硅酸盐学报

迁移性阻锈剂的优化及渗透阻锈性能

作者：刘志勇王子潇宋宁

单位：烟台大学土木工程学院山东烟台 264005

关键词：迁移性阻锈剂阻锈性能传输性能机理

分类号：TU5

出版年,卷(期):页码：2016,44(3):0-0

DOI：

摘要：

研究了迁移性阻锈剂(MCI)在氯盐溶液中的阻锈效果和在混凝土中的传输阻锈性能，基于阻锈效果和传输性能对MCI组成进行优化。结果表明：优化后的MCI (PCI-2015)在1%(质量分数)氯盐溶液中添加2%的PCI-2015后1 d，可使钢筋腐蚀电流密度(Icorr)降低到0.02 μA/cm2以下，并维持至28 d以上；其在立方体试件中渗透5 d的质量吸收率是优化前的6.78倍，在棱柱体试件中渗透5 d时，在70 mm高度处的氮含量为702 mg/kg；在含氯盐混凝土中渗透12 h后，可使钢筋Icorr降低到 0.1 μA/cm2以下。PCI-2015在混凝土中具有优异的传输阻锈性能，MCI分子可排除碳钢表面的氯离子，从而有效抑制碳钢锈蚀或使锈蚀碳钢修复。

The anti-corrosion effect of MCI in NaCl solution and the transmission efficiency of MCI in concrete were investigated. The composition of MCI was optimized based on these performances. The results show that when the optimized MCI (PCI-2015) of 2% (in mass fraction) in 1%NaCl solution is added for 1 d, the corrosion current density (Icorr) of corroded steel bar can be reduced to less than 0.02 μA/cm2, and Icorr can be below 0.02 μA/cm2 at least 28 d. The Icorr of steel bar in chloride contaminated concrete absorbed PCI-2015 for 12 h can be decreased to less than 0.1 μA/cm2. The absorbed weight of PCI-2015 is 6.78 times greater than that of the PCI-2010 in cubic concrete specimen, and the detected nitrogen content is 702 mg/kg at the depth of 70 mm in prism specimen in 5 d. The microscopic morphology and surface elements for mild steel immersed in 1%NaCl solution with 2% PCI-2015 were determined by atomic force microscopy and X-ray photoelectron spectroscopy. The results indicate the molecules of PCI-2015 could displace chloride ions, thus inhibiting the steel corrosion or making corroded carbon steel repaired.

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