本文選題：電化學(xué)阻抗譜 + 陰極保護��； 參考：《北京交通大學(xué)》2015年碩士論文

【摘要】：隨著近年來海洋資源的不斷開發(fā),以鋼筋混凝土材料為主的海洋平臺大幅度投入使用。但是,由于其所處海洋環(huán)境的復(fù)雜性,時時處處受到腐蝕的危害,從而造成鋼筋銹蝕、平臺破壞、經(jīng)濟損失甚至人員傷亡。因此如何有效的對海洋環(huán)境下遭到電化學(xué)腐蝕的鋼筋材料進行腐蝕防護,成為了近年來的熱點問題。目前腐蝕防護普遍采用的方法包括覆蓋腐蝕防護層、選用耐腐蝕材料、陰極保護。根據(jù)國內(nèi)外的研究現(xiàn)狀,電化學(xué)領(lǐng)域的陰極保護技術(shù)是一項有效的防護技術(shù)。陰極保護技術(shù)中最佳電位值的確定往往采用經(jīng)驗值法或陰極極化曲線法,但是這兩種方法的準確性不高。通過調(diào)研發(fā)現(xiàn),電化學(xué)阻抗譜對于確定電化學(xué)系統(tǒng)的各項參數(shù)非常直觀準確,并且在腐蝕防護層的研究中已經(jīng)取得了良好的效果。 為了解決陰極保護中存在的準確度不高的問題,本文對陰極保護技術(shù)進行改進,提出了一種將電化學(xué)阻抗譜測量技術(shù)應(yīng)用于確定強制電流陰極保護中最佳保護電位的方法,并進行實驗驗證。本文主要工作內(nèi)容如下： 1、對海洋環(huán)境下陰極保護技術(shù)的發(fā)展應(yīng)用以及電化學(xué)阻抗譜的發(fā)展應(yīng)用進行分析。詳細描述電化學(xué)阻抗譜的理論基礎(chǔ),為等效電路的確定、電化學(xué)阻抗譜技術(shù)在陰極保護中的應(yīng)用提供理論依據(jù)。并分析了海洋環(huán)境下鋼筋腐蝕機理、強制電流陰極保護原理,為基于電化學(xué)阻抗譜的陰極保護方案設(shè)計提供依據(jù)。 2、對陰極保護技術(shù)進行改進,將電化學(xué)阻抗譜技術(shù)應(yīng)用到陰極保護中,應(yīng)用直流信號和交流信號同時對電極系統(tǒng)進行擾動并在頻率域?qū)﹄姌O體系的電化學(xué)阻抗譜進行分析,以達到確定強制電流陰極保護中最佳保護電位值的目標。在該最佳保護電位值的控制下,使得電極系統(tǒng)的腐蝕電阻值最大,腐蝕程度最小,保護效果最佳。 3、通過仿真驗證改進方案下陰極保護技術(shù)的可行性與準確性。首先搭建三電極體系,并通過Zview軟件擬合體系的阻抗譜,分析出電極系統(tǒng)的等效電路。其次結(jié)合開路狀態(tài)電極系統(tǒng)電化學(xué)阻抗譜分析,確定等效電路中元件參數(shù),最后,通過以上確定的等效電路與元件參數(shù),在Matlab軟件中對于腐蝕系統(tǒng)的電化學(xué)等效電路進行建模,并應(yīng)用直流信號和交流信號同時對電極系統(tǒng)進行擾動,仿真出極化過程的電化學(xué)阻抗譜、奈奎斯特圖、波特圖,確定出強制電流陰極保護的最佳保護電位值。此外對比陰極極化曲線的分析結(jié)果以及經(jīng)驗值,驗證了本文對陰極保護技術(shù)的改進方法的可行性與準確性。
[Abstract]:With the continuous development of marine resources in recent years, the offshore platform with reinforced concrete material as the main material has been put into use. However, due to the complexity of its marine environment, corrosion is always and everywhere, resulting in steel corrosion, platform damage, economic losses and even casualties. Therefore, how to effectively prevent the corrosion of steel bars which are corroded by electrochemistry in marine environment has become a hot issue in recent years. At present, the common methods of corrosion protection include covering corrosion protection layer, selecting corrosion resistant material and cathodic protection. The cathodic protection technology in electrochemical field is an effective protection technology according to the current research situation at home and abroad. The best potential value in cathodic protection technology is usually determined by experience value method or cathodic polarization curve method, but the accuracy of these two methods is not high. It is found that electrochemical impedance spectroscopy is very intuitive and accurate in determining the parameters of electrochemical system and has achieved good results in the study of corrosion protection layer. In order to solve the problem that the accuracy of cathodic protection is not high, the cathodic protection technology is improved in this paper, and a method of determining the best protection potential in forced current cathodic protection by electrochemical impedance spectroscopy is proposed. Experimental verification was carried out. The main work of this paper is as follows: 1. The development and application of cathodic protection technology and electrochemical impedance spectroscopy in marine environment are analyzed. The theoretical basis of electrochemical impedance spectroscopy is described in detail, which provides a theoretical basis for the determination of equivalent circuit and the application of electrochemical impedance spectroscopy in cathodic protection. The corrosion mechanism of reinforcement in marine environment and the principle of forced current cathodic protection are analyzed in order to provide the basis for the design of cathodic protection scheme based on electrochemical impedance spectroscopy. 2. The cathodic protection technology is improved. Electrochemical impedance spectroscopy (EIS) was applied to cathodic protection. DC and AC signals were used to disturb the electrode system and the electrochemical impedance spectrum of the electrode system was analyzed in the frequency domain. In order to achieve the goal of determining the best protection potential in forced current cathodic protection. Under the control of the optimum protection potential, the corrosion resistance of the electrode system is the largest, the corrosion degree is the least, and the protection effect is the best. 3. The feasibility and accuracy of the cathodic protection technology under the improved scheme are verified by simulation. First, the three-electrode system is built, and the equivalent circuit of the electrode system is analyzed by fitting the impedance spectrum of the system with ZVIEW software. Secondly, combining with the electrochemical impedance spectrum analysis of the open circuit state electrode system, the element parameters in the equivalent circuit are determined. Finally, the electrochemical equivalent circuit of the corrosion system is modeled in Matlab software through the above determined equivalent circuit and component parameters. At the same time, the DC signal and AC signal are used to disturb the electrode system, and the electrochemical impedance spectrum, Nyquist diagram and Porter diagram of polarization process are simulated, and the best protection potential of forced current cathodic protection is determined. In addition, the feasibility and accuracy of the improved method for cathodic protection are verified by comparing the analytical results and experience values of cathodic polarization curves.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE985;TP273

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