钢结构浪溅区腐蚀防护技术及缓蚀剂在干湿交替下的研究
发布时间：2018-10-08 16:48
【摘要】：浪花飞溅区是海洋环境中腐蚀最严重的区带。复层矿脂包覆防腐技术（PTC）已经被证明为一种长期有效的钢结构浪花飞溅区腐蚀防护技术。矿脂防蚀膏是PTC技术的核心内容，它的性能决定了PTC技术的稳定性和耐久性，对矿脂防蚀膏的配方进行优化具有重要意义。本文采用山东省地方标准《矿脂防蚀膏》中规定的耐温流动性和锥入度检测方法，结合中性盐雾和电化学交流阻抗实验，通过选用不同种类的基础油，添加降凝剂和硬脂酸钙等功能组分，，对矿脂防蚀膏的基础配方进行优化。研究结果表明：当硬脂酸钙含量为3%时，以T13号石蜡油为基础油配制的矿脂防蚀膏的各项性能良好。 干湿交替是导致钢结构在浪花飞溅区腐蚀严重的一个重要因素，矿脂防蚀膏中含有的缓蚀剂成分可以从腐蚀电化学的角度对碳钢进行保护，研究缓蚀剂在干湿交替环境下对碳钢的缓蚀作用有助于人们理解PTC技术的内在保护机理，同时为人们提供了一种研究缓蚀剂的新方法。本文选取单宁酸和聚天冬氨酸作为缓蚀剂，采用极化曲线和交流阻抗等电化学实验方法，研究了它们在干湿交替环境下对碳钢的缓蚀作用；采用表面扫描电镜、X-射线衍射和傅里叶红外光谱等手段对腐蚀产物进行表征。研究结果表明：单宁酸可以有效抑制碳钢在干湿交替环境下的腐蚀；单宁酸浓度为1g/L时，缓蚀效率可达86%；单宁酸与FeOOH的优先反应抑制了锈层的腐蚀加速作用。含有聚天冬氨酸的复配缓蚀剂对碳钢在干湿交替环境下的缓蚀效果更好；复配缓蚀剂的缓蚀效率为92.6%；经过8次干湿交替后，碳钢表面的腐蚀程度明显减弱。 作为对聚天冬氨酸研究的拓展，考察了它在酸洗缓蚀剂领域中的应用。本文利用极化曲线、交流阻抗、扫描电镜和光电子能谱等技术，研究了聚天冬氨酸与碘化钾（KI）复配后对碳钢在硫酸溶液中的缓蚀作用。研究结果表明：聚天冬氨酸与KI复配使用，缓蚀效率达到95%以上；缓蚀效率提高是由于I-的阴离子效应加强了聚天冬氨酸在金属表面的吸附。
[Abstract]:The spray splash zone is the most corroded zone in the marine environment. (PTC) has been proved to be a long-term effective corrosion protection technology in spray zone of steel structure. Mineral grease corrosion inhibitor is the core of PTC technology. Its performance determines the stability and durability of PTC technology. It is of great significance to optimize the formula of mineral grease anticorrosion paste. In this paper, the testing method of temperature resistance fluidity and cone penetration is adopted in Shandong Province, which is stipulated in the local standard "Mineral Lipid Anti-corrosion paste", combined with neutral salt spray and electrochemical AC impedance test, through the selection of different kinds of base oil. Adding functional components such as pour point depressant and calcium stearate, the basic formula of mineral grease anticorrosion paste was optimized. The results show that when the content of calcium stearate is 3, the properties of the oil base oil T13 are good. The alternation of dry and wet is one of the important factors leading to the serious corrosion of steel structure in the spray zone. The corrosion inhibitor component contained in the anti-corrosion paste of mineral grease can protect carbon steel from the angle of corrosion electrochemistry. The study of corrosion inhibition effect of corrosion inhibitor on carbon steel in dry and wet alternate environment is helpful for people to understand the inherent protection mechanism of PTC technology and provide a new method for studying corrosion inhibitor. In this paper, tannic acid and polyaspartic acid were selected as corrosion inhibitors, and electrochemical experiments such as polarization curve and AC impedance were used to study their corrosion inhibition on carbon steel under the alternating dry and wet environment. Surface scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) were used to characterize the corrosion products. The results show that tannic acid can effectively inhibit the corrosion of carbon steel in dry and wet alternate environment, the corrosion inhibition efficiency can reach 86 when the concentration of tannic acid is 1g/L, and the preferential reaction between tannic acid and FeOOH inhibits the accelerated corrosion of rust layer. The corrosion inhibition effect of the composite corrosion inhibitor containing polyaspartic acid is better than that of the carbon steel under the alternating dry and wet environment. The corrosion inhibition efficiency of the complex inhibitor is 92.60.After 8 times of dry and wet alternation, the corrosion degree of carbon steel surface is obviously weakened. As an extension of the study of polyaspartic acid, the application of polyaspartic acid in the field of acid pickling inhibitor was investigated. The inhibition effect of polyaspartic acid (PAA) combined with potassium iodide (KI) on the corrosion of carbon steel in sulfuric acid solution was studied by means of polarization curve, AC impedance, scanning electron microscopy and photoelectron spectroscopy. The results show that the inhibition efficiency of polyaspartic acid combined with KI is over 95%, and the increase of inhibition efficiency is due to the enhancement of adsorption of polyaspartic acid on metal surface by the anionic effect of I-.
【学位授予单位】：中国科学院研究生院（海洋研究所）
【学位级别】：博士
【学位授予年份】：2014
【分类号】：P755.3
本文编号：2257518
[Abstract]:The spray splash zone is the most corroded zone in the marine environment. (PTC) has been proved to be a long-term effective corrosion protection technology in spray zone of steel structure. Mineral grease corrosion inhibitor is the core of PTC technology. Its performance determines the stability and durability of PTC technology. It is of great significance to optimize the formula of mineral grease anticorrosion paste. In this paper, the testing method of temperature resistance fluidity and cone penetration is adopted in Shandong Province, which is stipulated in the local standard "Mineral Lipid Anti-corrosion paste", combined with neutral salt spray and electrochemical AC impedance test, through the selection of different kinds of base oil. Adding functional components such as pour point depressant and calcium stearate, the basic formula of mineral grease anticorrosion paste was optimized. The results show that when the content of calcium stearate is 3, the properties of the oil base oil T13 are good. The alternation of dry and wet is one of the important factors leading to the serious corrosion of steel structure in the spray zone. The corrosion inhibitor component contained in the anti-corrosion paste of mineral grease can protect carbon steel from the angle of corrosion electrochemistry. The study of corrosion inhibition effect of corrosion inhibitor on carbon steel in dry and wet alternate environment is helpful for people to understand the inherent protection mechanism of PTC technology and provide a new method for studying corrosion inhibitor. In this paper, tannic acid and polyaspartic acid were selected as corrosion inhibitors, and electrochemical experiments such as polarization curve and AC impedance were used to study their corrosion inhibition on carbon steel under the alternating dry and wet environment. Surface scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) were used to characterize the corrosion products. The results show that tannic acid can effectively inhibit the corrosion of carbon steel in dry and wet alternate environment, the corrosion inhibition efficiency can reach 86 when the concentration of tannic acid is 1g/L, and the preferential reaction between tannic acid and FeOOH inhibits the accelerated corrosion of rust layer. The corrosion inhibition effect of the composite corrosion inhibitor containing polyaspartic acid is better than that of the carbon steel under the alternating dry and wet environment. The corrosion inhibition efficiency of the complex inhibitor is 92.60.After 8 times of dry and wet alternation, the corrosion degree of carbon steel surface is obviously weakened. As an extension of the study of polyaspartic acid, the application of polyaspartic acid in the field of acid pickling inhibitor was investigated. The inhibition effect of polyaspartic acid (PAA) combined with potassium iodide (KI) on the corrosion of carbon steel in sulfuric acid solution was studied by means of polarization curve, AC impedance, scanning electron microscopy and photoelectron spectroscopy. The results show that the inhibition efficiency of polyaspartic acid combined with KI is over 95%, and the increase of inhibition efficiency is due to the enhancement of adsorption of polyaspartic acid on metal surface by the anionic effect of I-.
【学位授予单位】：中国科学院研究生院（海洋研究所）
【学位级别】：博士
【学位授予年份】：2014
【分类号】：P755.3
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