【摘要】：本文通過電化學(xué)加速腐蝕實驗和環(huán)境氣氛腐蝕實驗,研究緩蝕劑成分對緩蝕率的影響,分析防銹劑的防銹性能,建立防銹劑成分、鋼筋溫度、防銹劑溫度和處理時間與緩蝕率的關(guān)系與規(guī)律,開發(fā)出高效、環(huán)保和低成本的防銹劑,實際應(yīng)用于長江鋼鐵公司穿水處理的熱軋鋼筋的防銹生產(chǎn)。制備的無機復(fù)合防銹劑環(huán)保,不含鉻離子、亞硝酸鹽及有毒的物質(zhì)。石墨烯及碳酸鈉含量對緩蝕率的影響結(jié)果表明隨著碳酸鈉及石墨烯含量的增加,鋼筋的自腐蝕電位明顯升高,緩蝕率增加。碳酸鈉的較優(yōu)的含量分別為20wt.%,石墨烯的較優(yōu)的含量分別為0.02wt.%,緩蝕率可以達到52.8%。大氣暴露腐蝕結(jié)果表明所得無機復(fù)合防銹劑處理鋼筋后,經(jīng)過90天后,鋼筋未出現(xiàn)銹蝕現(xiàn)象。在水環(huán)境腐蝕條件下,經(jīng)過24 h淋雨試驗,鋼筋表面沒有明顯的銹蝕,經(jīng)過48 h淋雨試驗,其抗雨水腐蝕的效果明顯降低。乳液種類對鋼筋緩蝕率的影響結(jié)果表明不同種類的乳液都可以提高鋼筋的自腐蝕電位及降低腐蝕電流,提高鋼筋的耐腐蝕能力。防銹劑中添加氟碳乳液DF-1后,防銹劑的緩蝕率最高,可以達到71.5%,表明在所研究的高分子乳液中,氟碳乳液DF-1是最佳的高分子乳液緩蝕劑,其較優(yōu)的含量為5%。耐水腐蝕性能測試結(jié)果表明經(jīng)過24 h的腐蝕后,經(jīng)防銹劑處理后鋼筋的表面銹蝕不明顯,隨著腐蝕時間增加至72 h,鋼筋表面腐蝕程度明顯增加,但是與未穿水鋼筋表面的產(chǎn)生的重銹蝕相比,其發(fā)生銹蝕的程度輕得多。X-射線衍射(XRD)分析顯示腐蝕產(chǎn)物由Fe2O3和Fe3O4構(gòu)成,掃描電子顯微鏡(SEM)分析表明經(jīng)過無機-高分子復(fù)合防銹劑處理后,鋼筋表面被較致密的防銹膜層所覆蓋,防銹膜層的厚度約為30μm,防銹膜層緊密附著于鋼筋表面,形成由氟碳高分子、石墨烯相互交聯(lián)、致密的具有疏水作用的防銹膜層,阻止了水分子進入鋼筋表面,抑制了鋼筋的銹蝕。防銹工藝參數(shù)對緩蝕率的影響結(jié)果表明不同防銹工藝參數(shù)下處理鋼筋后的緩蝕率在61.2%到73.3%之間,防銹工藝參數(shù)對緩蝕率的影響不明顯,可以在寬廣的防銹工藝參數(shù)范圍內(nèi)對鋼筋進行防銹處理。噸鋼防銹劑用量估算結(jié)果表明伴隨著鋼筋直徑的增大,防銹劑所使用的量明顯減少。直徑為10 mm的噸鋼防銹劑的用量約5.8 kg,隨著鋼筋直徑增加到25 mm,噸鋼防銹劑的用量約2.6 kg。氟碳乳液F-117含量對緩蝕率的影響結(jié)果表明氟碳乳液含量為3.5wt.%時,鋼筋的緩蝕率可以達到69.8%。采用含有0.5wt.%的聚胺酯固化劑MR-100形成的防銹劑處理后,鋼筋的緩蝕率的最高,可以達到84.9%。“氟碳乳液F-117 3.5%、碳酸鈉20%、石墨烯0.02%、聚胺酯固化劑MR-100 0.5%、十二碳醇酯0.1%”是優(yōu)化出的防銹劑成分體系。鋼筋在線中試生產(chǎn)結(jié)果表明螺紋鋼筋防銹處理工藝高效,不影響生產(chǎn)節(jié)奏。在大氣暴露腐蝕環(huán)境(日曬、濕度低于90%RH)下,防銹處理后鋼筋表面至少3個月內(nèi)不會出現(xiàn)銹蝕。在水環(huán)境(淋雨)腐蝕條件下,經(jīng)過24 h淋雨試驗,鋼筋在線防銹處理后鋼筋表面沒有明顯的銹蝕,經(jīng)過168 h淋雨試驗,鋼筋表面的銹蝕程度明顯輕于未經(jīng)防銹處理的鋼筋。規(guī)格Φ10 mm的熱軋水冷螺紋鋼筋的噸鋼防銹劑用量為5kg。
[Abstract]:In this paper, the effect of corrosion inhibitor composition on corrosion inhibition rate is studied by electrochemical accelerated corrosion test and environmental atmospheric corrosion test. The antirust performance of antirust agent is analyzed. The relationship and law between corrosion inhibitor composition, steel bar temperature, antirust agent temperature and treatment time and corrosion inhibition rate are established. The results show that with the increase of sodium carbonate and graphene content, the corrosion potential of steel bar increases obviously and the corrosion inhibition rate increases. The optimum content of sodium carbonate is 20wt.%, graphene is 0.02wt.% and corrosion inhibition rate is 52.8%. The results of atmospheric exposure corrosion show that the steel bars treated with the inorganic compound rust inhibitor have no rust after 90 days. Under the condition of water environment corrosion, the steel bars surface is tested by 24 h rain. There is no obvious rust. After 48 h rain test, the effect of anti rain corrosion is obviously reduced. The effect of emulsion type on the corrosion inhibition rate of steel bar shows that different types of emulsion can improve the corrosion potential of steel bar and reduce corrosion current, and enhance the corrosion resistance of steel bar. After adding fluorocarbon emulsion DF-1 to rust inhibitor, rust inhibitor can be used. The highest inhibition rate can reach 71.5%, indicating that the fluorocarbon emulsion DF-1 is the best polymer emulsion inhibitor in the polymer emulsion studied. The best content is 5%. water resistance test results show that after 24 h corrosion, the surface corrosion of the steel bar is not obvious after the corrosion inhibitor treatment, and the corrosion time increases to 72 h steel. X-ray diffraction (XRD) analysis showed that the corrosion products were composed of Fe2O3 and Fe3O4, and scanning electron microscopy (SEM) analysis showed that the surface of the steel bar was relatively induced by inorganic-polymer composite antirust agent. The thickness of the rust-proof film is about 30 micron. The rust-proof film adheres closely to the surface of the steel bar, forming a dense and hydrophobic rust-proof film with fluorocarbon polymer and graphene crosslinking, which prevents water molecules from entering the surface of the steel bar and inhibits the corrosion of the steel bar. The results show that the corrosion inhibition rate of treated steel bars is between 61.2% and 73.3% under different anti-rust technological parameters, and the influence of anti-rust technological parameters on corrosion inhibition rate is not obvious. The steel bars can be treated with anti-rust treatment in a wide range of anti-rust technological parameters. The dosage of the steel rust inhibitor with diameter of 10 mm is significantly reduced by 5.8 kg. With the increase of the diameter of the steel bar to 25 mm, the dosage of the corrosion inhibitor for the steel is about 2.6 kg.. The influence of the F-117 content of the fluorocarbon emulsion on the corrosion inhibition rate shows that the corrosion inhibition rate of the reinforcing steel can reach 69.8%. when the content of fluorocarbon emulsion is 3.5wt.%, and the polyurethane curing agent containing 0.5wt.% is used. 00 after the rust inhibitor is formed, the maximum corrosion inhibition rate of the steel bar can reach 84.9%. "fluorocarbon emulsion F-117 3.5%, sodium carbonate 20%, graphene 0.02%, polyamine curing agent MR-100 0.5%, twelve carbon alcohol ester 0.1%" is the optimized rust inhibitor composition system. The results of online pilot production of reinforcing bar show that the corrosion prevention process of the reinforcing steel bar is highly effective. In the atmospheric exposure corrosion environment (sunshine, humidity below 90% RH), the surface of steel bars treated with anti-rust will not rust for at least 3 months. Under the water environment (rain) corrosion conditions, after 24 hours rain test, the surface of steel bars treated with on-line anti-rust has no obvious rust. After 168 hours rain test, the surface of steel bars rusted. The corrosion degree of the steel bars is obviously lighter than that of the steel bars without anti-rust treatment.
【學(xué)位授予單位】：安徽工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG174.42

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