醇胺类迁移型阻锈剂对海洋钢筋混凝土的防腐蚀机理

	醇胺类迁移型阻锈剂对海洋钢筋混凝土的防腐蚀机理
	麻福斌1,2
学位类型	博士
导师	侯保荣
	2015-05
学位授予单位	中国科学院大学
学位授予地点	北京
学位专业	海洋腐蚀与防护-海工材料的腐蚀与防护
关键词	迁移型阻锈剂海洋钢筋混凝土氯离子传输机理
摘要	针对海洋钢筋混凝土结构的腐蚀防护与修复问题，本文主要研究了醇胺类迁移型阻锈剂（MCI）对海洋钢筋混凝土的防腐蚀性能和机理。利用混凝土耐久性试验、化学分析和电化学分析等实验方法，分析了醇胺类MCI对混凝土本体耐久性的作用机理、MCI在混凝土中的传输性能和机理，以及MCI对钢筋的防腐蚀作用机理；通过电化学实验和量子化学计算方法，研究了5种含氨基、羟基的简单醇胺类化合物对钢筋的阻锈性能、机理与分子结构的相关性。醇胺类MCI通过改善混凝土微观孔结构，提升混凝土抗碳化、抗水渗透、抗氯离子渗透等性能，从而提升混凝土耐久性。醇胺类MCI中磷酸盐、偏硅酸盐类组分与钙盐发生反应，在孔隙内吸附沉积，细化、堵塞孔隙，将多害孔和有害孔向少害孔和无害孔转变，降低最可几孔径和总孔隙率；同时硅烷类憎水组分起防水密封作用，各组分共同作用改善混凝土的耐久性。在自然条件下，醇胺类MCI在混凝土中以毛细吸收和扩散的方式传输；在外加电场作用下，MCI中带正电组分以电迁移方式传输。从阻锈剂含量和渗透深度测试分析可知，外加电场大大加速了MCI的传输速度，因此可以选用合理电场，在排出氯盐的同时，加速醇胺类MCI向混凝土内部迁移，对海洋钢筋混凝土起双重防护和修复作用。在混凝土模拟孔溶液中，醇胺类MCI对钢筋具备良好的阻锈作用，其阻锈机理是通过在钢筋表面吸附并参与钝化膜的形成，增加了膜电阻和电化学反应的电荷转移电阻，降低了维钝电流密度，提高了击穿电位。所选的5种简单醇胺类化合物的阻锈性能与其分子结构、-OH、-NH₂等作用基团有关，-NH₂比-OH更有利于提高化合物对碳钢的阻锈性能，分子构型对阻锈性能也有一定影响。
其他摘要	The performance and mechanism of amino alcohol based migrating corrosion inhibitors (MCI) for marine reinforced concrete were mainly studied in this paper. Experiments such as concrete durability tests, chemical and electrochemical analysis were used to investigate the effects and mechanism of MCI on concrete durability, the transporting mechanism of MCI in concrete under natural and electric field conditions, and inhibition mechanism on rebar in simulated concrete pore solution. The structure-function relationship between the inhibition performance and structure factors of 5 kinds of alcamines containing amino and hydroxyl groups were studied by electrochemical experiments and quantum chemical calculation. The following conclusions can be obtained. The concrete durability parameters such as carbonation resistance, water and chloride resistance are promoted as the concrete pore structures are improved by amino alcohol based MCI. The phosphate and metasilicate components react with calcium salts in the concrete pores whose reaction product can refine and block some pores. The harmful concrete pores are transformed into harmless pores. At the same time the silane hydrophobic components play a role of waterproof and sealing function. All of these components jointly promote the durability of concrete. Under natural conditions, positive charged component of amino alcohol based MCI transports by capillary absorption and diffusion, while it transports by electromigration under electric field. It could be inferred from the tests of MCI content and penetration depth that electric field largely accelerates the transmission of MCI. Therefore, a proper electric field can be selected for chloride extraction from concrete and MCI migrating into the concrete which plays a role of dual protection and restoration effect for marine reinforced concrete. In the simulated concrete pore solution, amino alcohol based MCI shows good inhibition effect on rebar. It works by adsorbing on the surface and participating in the formation of passive film which increases the film resistance and charge transfer resistance of corrosion process, reduces passive current density and increases the breakdown potential. The inhibition performance of the selected 5 kinds of alcamines is related to their molecular structure and -OH、-NH₂groups. The effect of –NH₂ on the inhibition performance for carbon steel is stronger than that of –OH. The molecular structures also have some effect on the inhibition performance.
学科领域	主要研究方向:海洋腐蚀与防护
语种	中文
文献类型	学位论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/22772
专题	海洋环境腐蚀与生物污损重点实验室
作者单位	1.中国科学院海洋研究所 2.中国科学院大学
第一作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	麻福斌. 醇胺类迁移型阻锈剂对海洋钢筋混凝土的防腐蚀机理[D]. 北京. 中国科学院大学,2015.

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