钢筋绿色高效水基防锈剂的开发及应用

发布时间：2018-08-19 09:45

【摘要】：本文通过电化学加速腐蚀实验和环境气氛腐蚀实验,研究缓蚀剂成分对缓蚀率的影响,分析防锈剂的防锈性能,建立防锈剂成分、钢筋温度、防锈剂温度和处理时间与缓蚀率的关系与规律,开发出高效、环保和低成本的防锈剂,实际应用于长江钢铁公司穿水处理的热轧钢筋的防锈生产。制备的无机复合防锈剂环保,不含铬离子、亚硝酸盐及有毒的物质。石墨烯及碳酸钠含量对缓蚀率的影响结果表明随着碳酸钠及石墨烯含量的增加,钢筋的自腐蚀电位明显升高,缓蚀率增加。碳酸钠的较优的含量分别为20wt.%,石墨烯的较优的含量分别为0.02wt.%,缓蚀率可以达到52.8%。大气暴露腐蚀结果表明所得无机复合防锈剂处理钢筋后,经过90天后,钢筋未出现锈蚀现象。在水环境腐蚀条件下,经过24 h淋雨试验,钢筋表面没有明显的锈蚀,经过48 h淋雨试验,其抗雨水腐蚀的效果明显降低。乳液种类对钢筋缓蚀率的影响结果表明不同种类的乳液都可以提高钢筋的自腐蚀电位及降低腐蚀电流,提高钢筋的耐腐蚀能力。防锈剂中添加氟碳乳液DF-1后,防锈剂的缓蚀率最高,可以达到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缓蚀剂,其较优的含量为5%。耐水腐蚀性能测试结果表明经过24 h的腐蚀后,经防锈剂处理后钢筋的表面锈蚀不明显,随着腐蚀时间增加至72 h,钢筋表面腐蚀程度明显增加,但是与未穿水钢筋表面的产生的重锈蚀相比,其发生锈蚀的程度轻得多。X-射线衍射(XRD)分析显示腐蚀产物由Fe2O3和Fe3O4构成,扫描电子显微镜(SEM)分析表明经过无机-高分子复合防锈剂处理后,钢筋表面被较致密的防锈膜层所覆盖,防锈膜层的厚度约为30μm,防锈膜层紧密附着于钢筋表面,形成由氟碳高分子、石墨烯相互交联、致密的具有疏水作用的防锈膜层,阻止了水分子进入钢筋表面,抑制了钢筋的锈蚀。防锈工艺参数对缓蚀率的影响结果表明不同防锈工艺参数下处理钢筋后的缓蚀率在61.2%到73.3%之间,防锈工艺参数对缓蚀率的影响不明显,可以在宽广的防锈工艺参数范围内对钢筋进行防锈处理。吨钢防锈剂用量估算结果表明伴随着钢筋直径的增大,防锈剂所使用的量明显减少。直径为10 mm的吨钢防锈剂的用量约5.8 kg,随着钢筋直径增加到25 mm,吨钢防锈剂的用量约2.6 kg。氟碳乳液F-117含量对缓蚀率的影响结果表明氟碳乳液含量为3.5wt.%时,钢筋的缓蚀率可以达到69.8%。采用含有0.5wt.%的聚胺酯固化剂MR-100形成的防锈剂处理后,钢筋的缓蚀率的最高,可以达到84.9%。“氟碳乳液F-117 3.5%、碳酸钠20%、石墨烯0.02%、聚胺酯固化剂MR-100 0.5%、十二碳醇酯0.1%”是优化出的防锈剂成分体系。钢筋在线中试生产结果表明螺纹钢筋防锈处理工艺高效,不影响生产节奏。在大气暴露腐蚀环境(日晒、湿度低于90%RH)下,防锈处理后钢筋表面至少3个月内不会出现锈蚀。在水环境(淋雨)腐蚀条件下,经过24 h淋雨试验,钢筋在线防锈处理后钢筋表面没有明显的锈蚀,经过168 h淋雨试验,钢筋表面的锈蚀程度明显轻于未经防锈处理的钢筋。规格Φ10 mm的热轧水冷螺纹钢筋的吨钢防锈剂用量为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.
【学位授予单位】：安徽工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG174.42

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