本文選題：氨基醇 + 阻銹劑　； 參考：《湖南科技大學(xué)》2017年碩士論文

【摘要】：鋼筋混凝土是目前最常用的建筑結(jié)構(gòu),由于混凝土孔隙液中的pH接近12.6,使鋼筋在高堿性環(huán)境下形成鈍化膜,不易受侵蝕性離子的破壞。隨著工業(yè)的發(fā)展,酸雨日漸嚴(yán)重,尤其是工業(yè)重區(qū),隨著鋼筋混凝土服役時(shí)間的延長(zhǎng),受到較嚴(yán)重的酸雨侵蝕。本文選取能同時(shí)抑制腐蝕的陰、陽(yáng)極過程的氨基醇類阻銹劑,使用單氟磷酸鈉阻銹劑做對(duì)比,探究氨基醇類阻銹劑在酸雨環(huán)境下的阻銹性能,并分析其阻銹機(jī)理。本試驗(yàn)通過宏觀觀察和計(jì)算碳鋼和鋼筋表面銹蝕面積初步判斷鋼筋阻銹劑的阻銹效果。然后使用微觀表征法深入判斷阻銹劑的阻銹性能,通過SEM電鏡掃描法,測(cè)定碳鋼表面鈍化膜的完整性和致密度、混凝土孔隙的致密性;使用XRD物相分析法,測(cè)定碳鋼表面和混凝土內(nèi)的水化產(chǎn)物。最后對(duì)碳鋼電極和鋼筋混凝土電極采用電化學(xué)方法,測(cè)定其在添加不同阻銹劑的介質(zhì)條件下的電荷轉(zhuǎn)移電阻、腐蝕溶液電阻等。并與單氟磷酸鈉阻銹劑做比較,綜合評(píng)定氨基醇類阻銹劑在酸雨和氯鹽環(huán)境下的阻銹性能并探究其阻銹機(jī)理。通過試驗(yàn),本文主要得到了以下結(jié)論:1)鋼筋混凝土結(jié)構(gòu)中,氨基醇類阻銹劑一方面通過促進(jìn)鋼筋表面形成致密完整的鈍化膜,提高鋼筋表面活化能,來保護(hù)鋼筋,另一方面,外涂型阻銹劑通過在混凝土表面形成沉淀,阻礙侵蝕性離子和介質(zhì)進(jìn)入混凝土內(nèi);內(nèi)摻型阻銹劑促進(jìn)混凝土水化,形成凝膠物質(zhì),吸附侵蝕性離子和介質(zhì),抑制侵蝕性離子和介質(zhì)侵入混凝土內(nèi)。從而達(dá)到保護(hù)鋼筋的目的。2)模擬孔隙溶液中,不論氯鹽環(huán)境還是酸雨條件下,宏觀觀察、微觀表征和電化學(xué)阻抗測(cè)試均顯示氨基醇類阻銹劑阻銹性能優(yōu)于單氟磷酸鈉,其中外涂型阻銹劑效果最佳。相比粉末狀的單氟磷酸鈉,不論在模擬孔隙溶液還是混凝土結(jié)構(gòu)中,液狀的氨基醇類阻銹劑更易擴(kuò)散且與接觸物融合。外涂型阻銹劑效果更優(yōu),原因是其擴(kuò)散和毛細(xì)吸收能力強(qiáng),更易滲入混凝土,不僅在混凝土表面與水泥中的部分物質(zhì)形成白色沉淀,阻止外界侵蝕性離子的侵入,并且到達(dá)鋼筋表面后通過特定的官能團(tuán)或螯合物能與鋼筋表面形成更均質(zhì)穩(wěn)定的鈍化膜;內(nèi)摻型阻銹劑的XRD物象分析圖顯示,其C3S衍射峰升高,說明該類阻銹劑能促進(jìn)混凝土水化,增大其致密度起到阻止侵蝕性離子侵入的作用;到達(dá)鋼筋表面后兩類鋼筋阻銹劑在鋼筋表面形成保護(hù)膜。兩類阻銹劑雖均改善了混凝土的致密度,阻止侵蝕性物質(zhì)的進(jìn)入,但也抑制了阻銹劑的進(jìn)入。3)混凝土結(jié)構(gòu)中,氯鹽環(huán)境下的外涂型阻銹劑性能優(yōu)于內(nèi)摻型阻銹劑,而酸雨試劑條件下的內(nèi)摻型阻銹劑性能優(yōu)于外涂型阻銹劑,且均優(yōu)于單氟磷酸鈉阻銹劑。相比侵蝕介質(zhì)單一的氯鹽環(huán)境,酸雨試劑中較低的pH,復(fù)合離子能更快速改變?cè)嚰幍沫h(huán)境,加速鋼筋脫鈍,故鋼筋阻銹劑在氯鹽環(huán)境下能提供更好的阻銹效果。酸雨環(huán)境下,內(nèi)摻型阻銹劑性能更優(yōu)的原因是硫酸鹽與氯鹽的耦合作用影響了外涂型阻銹劑的遷移。4)氯鹽環(huán)境中,模擬混凝土孔隙溶液和混凝土試件中外涂型氨基醇阻銹劑阻銹性能優(yōu)于內(nèi)摻型氨基醇阻銹劑。酸雨溶液中模擬混凝土孔隙溶液中外涂型氨基醇阻銹劑阻銹性能優(yōu)于內(nèi)摻型氨基醇阻銹劑,但混凝土試件中內(nèi)摻型氨基醇阻銹劑阻銹性能優(yōu)于外涂型氨基醇阻銹劑。原因是模擬孔隙溶液中,水劑型阻銹劑可以快速充分的與碳鋼電極表面進(jìn)行反應(yīng),外涂型氨基醇阻銹劑對(duì)碳鋼表面的吸附能力強(qiáng)于內(nèi)摻型氨基醇阻銹劑的,能更快速形成致密完整的鈍化膜,保護(hù)鋼筋。混凝土試件中,氯鹽環(huán)境時(shí),外涂型氨基醇阻銹劑通過在混凝土表面形成白色沉淀,能夠直接抑制侵蝕性離子侵入混凝土內(nèi)部,外涂型氨基醇阻銹劑進(jìn)入混凝土內(nèi)部后,相比內(nèi)摻型氨基醇阻銹劑,通過毛細(xì)吸收、揮發(fā)等方式能更快速到達(dá)鋼筋表面;酸雨中的氫離子結(jié)合混凝土中的堿性物質(zhì),降低了混凝土的pH,并且酸雨中的硫酸鹽和混凝土中的堿性物質(zhì)形成沉淀,雖一定程度上抑制侵蝕性物質(zhì)的進(jìn)入,但也抑制阻銹劑的進(jìn)入。模擬孔隙溶液中,酸雨中的硫酸鹽和氯離子間存在競(jìng)爭(zhēng)關(guān)系,水化鋁酸鈣會(huì)先與氯離子結(jié)合,然后硫酸鹽再與剩余的水化鋁酸鈣反應(yīng),所以氯離子能夠延緩硫酸鹽侵蝕,但降低了溶液pH,惡化了鋼筋表面形成鈍化膜的條件。
[Abstract]:Reinforced concrete is the most commonly used building structure at present. Because the pH in the concrete pore fluid is close to 12.6, it makes the steel form passivating film under the high alkaline environment. It is not easy to be destroyed by the corrosive ion. With the development of industry, acid rain is becoming more and more serious, especially in industrial heavy area. With the extension of the service time of reinforced concrete, it suffers more severe acid. This paper selects the amino alcohol inhibitor which can simultaneously suppress the corrosion in the negative and anodic process, and compares the rust resistance of the amino alcohol rust inhibitor in the acid rain environment with the contrast of the sodium monotrate rust inhibitor, and analyzes its rust resistance mechanism. This test is used to determine the initial corrosion area of the surface of carbon steel and steel bar by means of macroscopic observation and calculation. In order to determine the resistance of rust inhibitor, the resistance of rust inhibitor is determined by microscopic characterization method. Through SEM scanning electron microscopy, the integrity and density of the passivation film on the surface of carbon steel, the density of the concrete pores are measured, and the hydration products in the surface of carbon steel and the concrete are determined by XRD phase analysis. Finally, carbon steel electrodes and steel are used. Electrochemistry method was used to determine the electric charge transfer resistance and corrosion resistance under the medium of adding different inhibitors. Compared with the sodium monotrate rust inhibitor, the rust resistance of amino alcohol inhibitor in acid rain and chloride environment was evaluated and the mechanism of rust resistance was explored. The following conclusions are obtained: 1) in the reinforced concrete structure, the amino alcohol rust inhibitor can form a compact and complete passivation film on the surface of the steel bar to improve the surface activation energy of the steel bar to protect the steel bar. On the other hand, the coating type corrosion inhibitor can form precipitate on the surface of the concrete, and obstruct the corrosive ions and the medium into the concrete. The internal doping inhibitor promotes the hydration of concrete, forms the gel material, adsorb the erosive ions and media, inhibits the invasive ions and mediators to intruder into the concrete. Thus, the purpose of protecting the reinforced bar is.2). In the simulated pore solution, the macro observation, micro characterization and electrochemical impedance tests show ammonia in both the chlorine and acid rain conditions. The anti rust property of the basic alcohol inhibitor is superior to that of sodium mono phosphate, of which the external coating type inhibitor has the best effect. Compared with the powder like sodium monofluoride, the liquid amino alcohol inhibitor is more easily diffused and fused with the contact matter in the simulated pore solution or the concrete structure. The effect of the coating type inhibitor is better, the reason is its diffusion and capillary. The absorption capacity is strong, and it is easier to infiltrate into the concrete. It not only forms white precipitation on the concrete surface and the cement, prevents the invasion of the external corrosive ions, and can form a more homogeneous and stable passivation film with the surface of the steel bar through the specific functional groups or chelates to the surface of the steel bar; the XRD image analysis diagram of the internal admixture rust inhibitor It shows that the C3S diffraction peak increases, indicating that the rust inhibitor can promote the hydration of concrete and increase its density to prevent the invasion of corrosive ions. After reaching the surface of the steel bar, two kinds of reinforcing rust inhibitor can form a protective film on the surface of the steel bar. The two kind of rust inhibitor improves the density of the coagulant soil and prevents the entry of the erosive substance, but also, it also prevents the entry of the erosive substance. Inhibition of the entry of rust inhibitor into the.3) concrete structure, the performance of the external coated rust inhibitor in the chloride environment is better than the internal admixture inhibitor, while the acid rain reagent is superior to the external coating inhibitor and is better than the sodium monofluoride rust inhibitor. Compared with the single chloride environment of the corrosive medium, the lower pH in the acid rain reagents is complex. In the environment of acid rain, the coupling action of sulphate and chlorine affects the migration of the external coating type corrosion inhibitor.4) in the chloride environment, the simulated concrete hole is simulated in the chloride environment. The resistance to rust in the gap solution and concrete specimen is better than that of the inner admixture amino alcohol inhibitor. In the acid rain solution, the corrosion resistance of the coated amino alcohol inhibitor in the simulated concrete pore solution is superior to the inner admixture amino alcohol inhibitor, but the resistance to rust in the concrete specimen is better than that of the outer coated ammonia. The reason is that the water inhibitor can react quickly and fully to the surface of carbon steel electrode in the simulated pore solution. The adsorption capacity of the coated amino alcohol inhibitor on carbon steel surface is better than that of the inner admixture amino alcohol inhibitor. It can form a compact and complete passivation film more quickly and protect the steel. In the environment, the outer coated amino alcohol inhibitor can form white precipitation on the surface of the concrete, which can directly inhibit the invasion of the corrosive ions into the concrete, and the outer coated amino alcohol rust inhibitor enters the concrete. Compared with the inner admixture amino alcohol inhibitor, it can reach the steel surface more quickly through the capillary absorption and volatilization, and the hydrogen in acid rain The alkaline substance in the ion combined with concrete reduces the pH of the concrete, and the sulfate and the alkaline substance in the acid rain forms precipitation. Although it inhibits the entry of the corrosive substance to a certain extent, it also inhibits the entry of the rust inhibitor. In the simulated pore solution, there is a competitive relationship between the sulfate and the chloride ions in the acid rain, and the hydration is hydrated. Calcium aluminate combined with chloride ion first, and then sulfate reacts with the remaining hydrated calcium aluminate, so the chloride ion can delay sulfate erosion, but reduce the solution pH and deteriorate the condition of the formation of passivation film on the surface of the steel bar.
【學(xué)位授予單位】：湖南科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU528.042.6

【參考文獻(xiàn)】

相關(guān)期刊論文 前9條

1 唐詩(shī);湯雁冰;王勝年;范志宏;;氨基醇阻銹劑對(duì)鋼筋表面鈍化膜性能的影響[J];材料保護(hù);2016年03期

2 陳明實(shí);孫叢濤;于景飛;;鋼筋阻銹劑在混凝土中的阻銹機(jī)理[J];混凝土;2015年06期

3 于和煦;胡獻(xiàn)軍;倪亮;;阻銹劑減緩氯離子侵蝕研究[J];市政技術(shù);2013年01期

4 耿國(guó)慶;施錦杰;孫偉;;混凝土模擬液中鋼筋腐蝕電化學(xué)測(cè)試結(jié)果比較[J];東南大學(xué)學(xué)報(bào)(自然科學(xué)版);2011年02期

5 李偉華;裴長(zhǎng)嶺;何橋;侯保榮;;混凝土中鋼筋腐蝕與鋼筋阻銹劑[J];材料開發(fā)與應(yīng)用;2007年05期

6 張學(xué)元,安百剛,韓恩厚,李洪錫;酸雨對(duì)材料的腐蝕/沖刷研究現(xiàn)狀[J];腐蝕科學(xué)與防護(hù)技術(shù);2002年03期

7 徐永模;遷移性阻銹劑——鋼筋混凝土阻銹劑的新發(fā)展[J];硅酸鹽學(xué)報(bào);2002年01期

8 劉曉敏,史志明,許剛,林海潮,宋光鈴,曹楚南;硫酸鹽和溫度對(duì)鋼筋腐蝕行為的影響[J];中國(guó)腐蝕與防護(hù)學(xué)報(bào);1999年01期

9 亢景富;混凝土硫酸鹽侵蝕研究中的幾個(gè)基本問題[J];混凝土;1995年03期

相關(guān)碩士學(xué)位論文 前2條

1 楊磊;高分子鋼筋阻銹劑阻銹效果的研究[D];華南理工大學(xué);2012年

2 余志鋼;銹蝕鋼筋混凝土結(jié)構(gòu)性能和鋼筋阻銹劑性能的研究及應(yīng)用[D];湖南大學(xué);2004年

，

本文編號(hào)：1997460