绿色化迁移性阻锈剂及对含氯盐砼中钢筋腐蚀行为的影响

发布时间：2018-02-02 03:55

本文关键词： 迁移性阻锈剂(MCI) 环境友好阻锈机理气相传输传质　出处：《烟台大学》2017年硕士论文　论文类型：学位论文

【摘要】：基于环境友好理念,在已有工作基础上开发了一种无不友好气味的水性迁移性阻锈剂(PCI-2016)。采用电化学工作系统测试了在1%氯化钠溶液中添加PCI-2016对钢筋工作电极阻锈性能的影响,结果表明PCI-2016表现出优异的抑制钢筋锈蚀的能力。利用SEM-EDS和AFM-XPS等微观实验手段对添加和不添加PCI-2016的两组钢片表面进行成像观察和元素分析,结果表明添加PCI-2016的钢片无锈蚀,其表面形貌可清楚的观察到PCI-2016分子吸附在钢片表面形成一层致密保护膜动电位扫描实验结果支持上述结果。应用Temkin吸附方程对PCI-2016在钢片表面成膜的稳定性分析结果表明,PCI-2016在钢片表面的吸附行为是化学吸附。对添加PCI-2016修复氯盐溶液中锈蚀钢筋电极的临界修复浓度进行了初步研究,得出了氯离子浓度和PCI-2016浓度的关系式。初步研究了在不饱和条件下阻锈剂在混凝土中的数学简化传输模型,采用低场核磁技术对短期传输模型进行验证,结果表明该短期液相传输模型可用于分析PCI-2016在饱和条件下的传质过程,在此基础上研究了以Fick定律为基础的长期气相传质模型及传质过程,并通过实验测得钢筋界面区处氮含量的浓度与数值计算结果进行对比分析,验证模型的适用性。研究了将PCI-2016涂覆在新成型混凝土表面对其抗压强度以及非稳态迁移系数的影响,测试了在混凝土表面涂覆两道PCI-2016后非稳态迁移系数,分别降低到涂覆前的85.53%、79.39%和60.59%;以及测试了加涂一道防水剂后非稳态迁移系数降低到涂覆PCI-2016前的35.22%、29.09%和23.53%。剖开试件中钢筋XPS元素分析表明,PCI-2016可迁移至保护层下钢筋表面,甚至其氮元素可取代原有的氯。采用LPR方法研究了混凝土中钢筋经过四个烘浸循环腐蚀电流密度变化,采用三维扫描技术对剖出钢筋进行三维扫描和重构,应用数理统计方法对锈蚀钢筋进行了统计分析,结果表明在混凝土表面涂覆两道PCI-2016和一道防水剂后防护效果显著。
[Abstract]:Based on the concept of environmental friendliness. On the basis of the previous work, a kind of waterborne migration rust inhibitor, PCI-2016, without unfriendly odor has been developed. The effect of adding PCI-2016 in 1% sodium chloride solution on corrosion resistance of steel bar working electrode was measured by electrochemical working system. The results show that PCI-2016 has excellent ability to inhibit the corrosion of steel bars. The microcosmic experimental methods such as SEM-EDS and AFM-XPS were used to study the effect of adding and non-adding PCI-2016 on the two groups. The surface of steel sheet was observed by imaging and elemental analysis. The results show that there is no rust in the steel with PCI-2016. It was observed that PCI-2016 molecules adsorbed on the surface of steel sheet to form a dense protective film. The results of potentiodynamic scanning experiments supported the above results. Temkin adsorption equation was applied to PCI. The stability analysis of -2016 film on steel sheet shows that. The adsorption behavior of PCI-2016 on the surface of steel sheet is chemisorption. The critical repair concentration of corroded steel bar electrode in chloride solution by adding PCI-2016 was studied preliminarily. The relationship between chloride ion concentration and PCI-2016 concentration was obtained, and the mathematical simplified transport model of rust inhibitor in concrete under unsaturated conditions was studied. The short term transport model is verified by low field NMR technique. The results show that the short term liquid phase transport model can be used to analyze the mass transfer process of PCI-2016 under saturated conditions. On the basis of this, the long-term gas phase mass transfer model and mass transfer process based on Fick's law are studied, and the concentration of nitrogen at the interface of steel bar is measured by experiment and the numerical results are compared and analyzed. The effect of PCI-2016 coating on the compressive strength and unsteady transfer coefficient of newly formed concrete was studied. The unsteady-state migration coefficients of concrete coated with PCI-2016 were measured, and the unsteady transfer coefficients were reduced to 79.39% and 60.59% of those before coating, respectively. The unsteady migration coefficient of PCI-2016 was decreased to 35.22% after adding a waterproof agent. 29.09% and 23.53.The analysis of the XPS element of the steel bar in the dissected specimen shows that the PCI-2016 can be transferred to the surface of the steel bar under the protective layer. Even its nitrogen element can replace the original chlorine. The change of corrosion current density of steel bar in concrete after four drying cycles was studied by LPR method. Three-dimensional scanning technique was used to scan and reconstruct the steel bar. The statistical analysis of corroded steel bar is carried out by means of mathematical statistics. The results show that the protective effect of two PCI-2016 and one water-repellent on the surface of concrete is remarkable.
【学位授予单位】：烟台大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU375;TU528.042.6

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