本文關(guān)鍵詞： 遷移性阻銹劑(MCI) 環(huán)境友好 阻銹機理 氣相傳輸 傳質(zhì)　出處：《煙臺大學》2017年碩士論文　論文類型：學位論文

【摘要】：基于環(huán)境友好理念,在已有工作基礎(chǔ)上開發(fā)了一種無不友好氣味的水性遷移性阻銹劑(PCI-2016)。采用電化學工作系統(tǒng)測試了在1%氯化鈉溶液中添加PCI-2016對鋼筋工作電極阻銹性能的影響,結(jié)果表明PCI-2016表現(xiàn)出優(yōu)異的抑制鋼筋銹蝕的能力。利用SEM-EDS和AFM-XPS等微觀實驗手段對添加和不添加PCI-2016的兩組鋼片表面進行成像觀察和元素分析,結(jié)果表明添加PCI-2016的鋼片無銹蝕,其表面形貌可清楚的觀察到PCI-2016分子吸附在鋼片表面形成一層致密保護膜動電位掃描實驗結(jié)果支持上述結(jié)果。應用Temkin吸附方程對PCI-2016在鋼片表面成膜的穩(wěn)定性分析結(jié)果表明,PCI-2016在鋼片表面的吸附行為是化學吸附。對添加PCI-2016修復氯鹽溶液中銹蝕鋼筋電極的臨界修復濃度進行了初步研究,得出了氯離子濃度和PCI-2016濃度的關(guān)系式。初步研究了在不飽和條件下阻銹劑在混凝土中的數(shù)學簡化傳輸模型,采用低場核磁技術(shù)對短期傳輸模型進行驗證,結(jié)果表明該短期液相傳輸模型可用于分析PCI-2016在飽和條件下的傳質(zhì)過程,在此基礎(chǔ)上研究了以Fick定律為基礎(chǔ)的長期氣相傳質(zhì)模型及傳質(zhì)過程,并通過實驗測得鋼筋界面區(qū)處氮含量的濃度與數(shù)值計算結(jié)果進行對比分析,驗證模型的適用性。研究了將PCI-2016涂覆在新成型混凝土表面對其抗壓強度以及非穩(wěn)態(tài)遷移系數(shù)的影響,測試了在混凝土表面涂覆兩道PCI-2016后非穩(wěn)態(tài)遷移系數(shù),分別降低到涂覆前的85.53%、79.39%和60.59%;以及測試了加涂一道防水劑后非穩(wěn)態(tài)遷移系數(shù)降低到涂覆PCI-2016前的35.22%、29.09%和23.53%。剖開試件中鋼筋XPS元素分析表明,PCI-2016可遷移至保護層下鋼筋表面,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鋼筋經(jīng)過四個烘浸循環(huán)腐蝕電流密度變化,采用三維掃描技術(shù)對剖出鋼筋進行三維掃描和重構(gòu),應用數(shù)理統(tǒng)計方法對銹蝕鋼筋進行了統(tǒng)計分析,結(jié)果表明在混凝土表面涂覆兩道PCI-2016和一道防水劑后防護效果顯著。
[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.
【學位授予單位】：煙臺大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU375;TU528.042.6

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