鋼筋混凝土Cl~-離子檢測傳感器的制備與性能研究
發(fā)布時間：2018-09-10 09:29
【摘要】：氯鹽是引起鋼筋混凝土結構腐蝕的最主要因素,因此準確檢測其內氯離子濃度具有重要的意義。傳統的取樣檢測方法對混凝土結構本身產生損壞,且工作量大、操作繁瑣,而埋入式氯離子傳感器因電極壽命短、抗污染能力差也受到限制。本文以銀箔為基體制備了卷壓式Ag/AgCl電極,同時采用熱壓法制備了粉壓型Ag/AgCl電極以及粉壓型MnO2參比電極。實驗結果表明,電極具有較好的電化學響應特性曲線,適用于混凝土內氯離子含量的檢測。本文首先通過恒電流氧化法制備了卷壓式Ag/AgCl電極,并測試了其在模擬孔溶液中的響應,電極在溶液中浸泡230d內電位波動小于6mV,具有較接近理論值的線性響應斜率,且腐蝕電流密度大,具有一定的抗污染能力。SEM形貌分析表明:卷壓方式不僅增加了電極的活性比表面積,提高電極的穩(wěn)定性與反應活性;同時,借助AgCl/Ag的多層堆疊,增強了顆粒與基體間的附著力,提高Cl-離子檢測的可靠性及電極使用壽命。其次,對混凝土半透膜、堿性凝膠電解質、錳環(huán)體三部分進行了電化學測試并組裝制備MnO2參比電極。結果顯示,β-MnO2電化學活性更高,自制凝膠電解質的保水性和導電性良好,采用膨脹劑制備的混凝土半透膜電阻最小,MnO2電極埋置于混凝土中穩(wěn)定性良好,有一定的抗極化能力。本文還將卷壓式Ag/AgCl電極表面包裹含聚乙烯醇凝膠電解質的無紡布,并將其埋置于混凝土中,其養(yǎng)護齡期內電位穩(wěn)定性良好,電位與Log[Cl-]呈較好的線性度。在內摻低濃度的硫離子及胺類緩蝕劑情況下,電位漂移不大,表明其抗干擾能力強。與化學分析法相比,卷壓式電極所檢測的氯離子濃度偏小,但可通過誤差系數修正。本文最后還采用碳納米管(CNTs)與Ag/AgCl制備了碳基復合電極傳感器,發(fā)現Ag/AgCl/CNTs在溶液浸泡60d內電位穩(wěn)定性依然較好,其線性響應斜率為49.91mV,且具有較小的電荷傳遞電阻及較大的腐蝕電流密度,是一種有希望的混凝土Cl-濃度監(jiān)測傳感器。
[Abstract]:Chloride salt is the most important factor to cause corrosion of reinforced concrete structure, so it is very important to accurately detect the concentration of chloride ion in reinforced concrete structure. The traditional sampling and detection methods have caused damage to the concrete structure itself, and the workload is large and the operation is cumbersome. However, because of the short electrode life, the poor anti-pollution ability of the embedded chlorine ion sensor is also limited. In this paper, the rolled Ag/AgCl electrode was prepared with silver foil as the substrate, and the powder pressed Ag/AgCl electrode and the powdered MnO2 reference electrode were prepared by hot pressing method. The experimental results show that the electrode has a good electrochemical response curve and is suitable for the detection of chloride ion content in concrete. In this paper, the coil type Ag/AgCl electrode was prepared by constant current oxidation method, and its response in simulated pore solution was measured. The potential fluctuation was less than 6 MV within 230 days after immersion in the solution, which showed a linear response slope close to the theoretical value. Moreover, the corrosion current density is high, and it has some anti-pollution ability. SEM morphology analysis shows that the coiling method not only increases the specific surface area of the electrode, but also improves the stability and reaction activity of the electrode, at the same time, with the help of the multilayer stacking of AgCl/Ag, The adhesion between particles and matrix was enhanced, and the reliability of Cl- ion detection and the lifetime of electrode were improved. Secondly, the MnO2 reference electrode was prepared by electrochemical measurement on the three parts of semi-permeable concrete membrane, alkaline gel electrolyte and manganese ring. The results show that the electrochemical activity of 尾 -MnO2 is higher, the water retention and electrical conductivity of self-made gel electrolyte are good, and the semi-permeable film resistance of concrete prepared with dilatant has good stability and polarization resistance. In this paper, the non-woven fabric containing polyvinyl alcohol gel electrolyte is coated on the surface of the rolled Ag/AgCl electrode and buried in concrete. The potential has good stability during curing period, and the potential has a good linearity with Log [Cl-]. Under the condition of low concentration of sulfur ion and amine inhibitor, the potential drift is small, which indicates that its anti-interference ability is strong. Compared with the chemical analysis method, the chloride concentration detected by the coil electrode is smaller, but can be corrected by error coefficient. Finally, carbon nanotube (CNTs) and Ag/AgCl were used to fabricate the carbon based composite electrode sensor. It was found that the potential stability of Ag/AgCl/CNTs was still good within 60 days of immersion in solution. Its linear response slope is 49.91mV, and it has smaller charge transfer resistance and larger corrosion current density. It is a promising concrete Cl- concentration monitoring sensor.
【學位授予單位】：華中科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU375;TP212
[Abstract]:Chloride salt is the most important factor to cause corrosion of reinforced concrete structure, so it is very important to accurately detect the concentration of chloride ion in reinforced concrete structure. The traditional sampling and detection methods have caused damage to the concrete structure itself, and the workload is large and the operation is cumbersome. However, because of the short electrode life, the poor anti-pollution ability of the embedded chlorine ion sensor is also limited. In this paper, the rolled Ag/AgCl electrode was prepared with silver foil as the substrate, and the powder pressed Ag/AgCl electrode and the powdered MnO2 reference electrode were prepared by hot pressing method. The experimental results show that the electrode has a good electrochemical response curve and is suitable for the detection of chloride ion content in concrete. In this paper, the coil type Ag/AgCl electrode was prepared by constant current oxidation method, and its response in simulated pore solution was measured. The potential fluctuation was less than 6 MV within 230 days after immersion in the solution, which showed a linear response slope close to the theoretical value. Moreover, the corrosion current density is high, and it has some anti-pollution ability. SEM morphology analysis shows that the coiling method not only increases the specific surface area of the electrode, but also improves the stability and reaction activity of the electrode, at the same time, with the help of the multilayer stacking of AgCl/Ag, The adhesion between particles and matrix was enhanced, and the reliability of Cl- ion detection and the lifetime of electrode were improved. Secondly, the MnO2 reference electrode was prepared by electrochemical measurement on the three parts of semi-permeable concrete membrane, alkaline gel electrolyte and manganese ring. The results show that the electrochemical activity of 尾 -MnO2 is higher, the water retention and electrical conductivity of self-made gel electrolyte are good, and the semi-permeable film resistance of concrete prepared with dilatant has good stability and polarization resistance. In this paper, the non-woven fabric containing polyvinyl alcohol gel electrolyte is coated on the surface of the rolled Ag/AgCl electrode and buried in concrete. The potential has good stability during curing period, and the potential has a good linearity with Log [Cl-]. Under the condition of low concentration of sulfur ion and amine inhibitor, the potential drift is small, which indicates that its anti-interference ability is strong. Compared with the chemical analysis method, the chloride concentration detected by the coil electrode is smaller, but can be corrected by error coefficient. Finally, carbon nanotube (CNTs) and Ag/AgCl were used to fabricate the carbon based composite electrode sensor. It was found that the potential stability of Ag/AgCl/CNTs was still good within 60 days of immersion in solution. Its linear response slope is 49.91mV, and it has smaller charge transfer resistance and larger corrosion current density. It is a promising concrete Cl- concentration monitoring sensor.
【學位授予單位】：華中科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU375;TP212
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