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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%PCI-2015 1 d后,可使钢筋腐蚀电流密度(Icorr)降低到0.02μA/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0.1μA/cm2以下。表明PCI-2015在混凝土中具有优异的传输阻锈性能。采用原子力显微镜和X光电子能谱研究了在氯盐溶液中添加PCI-2015后碳钢的微观形貌及表面元素,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 corrosion resistance of migratory rust inhibitor (MCI) in chloride solution and the transmission rust resistance in concrete were studied. The composition of MCI was optimized based on the corrosion inhibition effect and transmission performance. The results show that the corrosion current density (Icorr) can be reduced to less than 0.02μA / cm2 after the optimized MCI (PCI-2015) is added with 1% PCI- And maintained above 28 d. The mass absorption rate of 5 d after being infiltrated into the cube specimen was 6.78 times that before optimization, and the nitrogen content at the height of 70 mm was 702 mg / kg; Icorr can be reduced to less than 0.1μA / cm2 after infiltration for 12h in chloride concrete. PCI-2015 shows excellent resistance to transport rust in concrete. Atomic force microscopy and X-ray photoelectron spectroscopy were used to study the microstructure and surface elements of carbon steel after adding PCI-2015 to the chloride salt solution. The MCI molecule can eliminate the chloride ion on the surface of carbon steel so as to effectively inhibit the corrosion of carbon steel or make the corrosion Carbon steel repair.