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通过分子自组装技术在铜表面制备2-氨基-5-巯基-1,3,4-噻二唑缩对羟基苯甲醛(简称A)和2-氨基苯并咪唑缩对羟基苯甲醛(简称B)缓蚀膜。采用电化学测试方法研究了两种席夫碱自组装膜在质量分数为3%的NaCl溶液中对铜的缓蚀作用。结果表明,自组装分子膜能有效抑制铜片的腐蚀,对于席夫碱A,当溶液浓度为15 mmol·L-1,组装时间为6 h时缓蚀效果最佳;对于席夫碱B,当溶液浓度为20 mmol·L-1,组装时间为12 h时缓蚀效果最佳,A、B的缓蚀效率分别达到98.9%和96.73%。表面分析技术表明,席夫碱化合物在铜表面形成一层保护膜,有效阻挡了腐蚀粒子向金属基底的转移,从而抑制了腐蚀的发生。量化计算和分子动力学模拟分析了A、B两种缓蚀剂分子构型与缓蚀性能的关系以及在铜表面的吸附形态,结果表明,两种缓蚀剂具有很好的缓蚀性能,且缓蚀效果A>B,与实验结果一致。 相似文献
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无磷缓蚀阻垢剂TH-907在循环冷却水中的应用研究 总被引:1,自引:0,他引:1
TH-907为一种无磷缓蚀阻垢剂,对汉邦石化有限公司循环冷却水进行静态阻垢试验、旋转挂片腐蚀试验和动态模拟试验。结果表明,补充水的药剂投加量为15 mg/L,浓缩倍数为4.0时,阻垢率达90%以上,TH-907对碳钢、不锈钢材质都有较好的缓蚀效果,各项指标均符合GB50050-2007《工业循环冷却水设计规范》标准,并且药品不含磷,有效避免了磷在水中富营养化的问题。 相似文献
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石灰软化水pH值对冷却水系统铜管腐蚀结垢的影响 总被引:1,自引:0,他引:1
大型火电厂中,作为循环冷却水补充水的石灰软化水出水pH值范围较宽,一些机组凝汽器铜管因此产生腐蚀、结垢问题。通过腐蚀和阻垢试验,考察了石灰软化处理系统出水pH值对火电厂循环冷却水系统腐蚀和结垢的影响,试验表明,石灰软化水系统出水pH值为8.5~9.5时,凝汽器HSn70-1和BFe30-1-1铜管腐蚀均较轻;随pH值增高,冷却水结垢倾向略有增加。 相似文献
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采用溶剂法合成了两种新型咪唑啉缓蚀剂1-(2-氨乙基)-2-油酸基咪唑啉(A)和1-(2-氨基-硫脲乙基)-2-油酸基咪唑啉(B),通过静态失重法和电化学极化曲线对其缓蚀性能进行了评价,并通过量子化学和分子动力学模拟方法对其缓蚀机理进行了研究。结果表明,两种缓蚀剂均具有较好的抗盐酸腐蚀性能,能同时抑制Q235钢的阴、阳极反应过程。在0~250 mg·L-1浓度范围内,B的缓蚀性能优于A,且二者的最佳实验浓度均为150 mg·L-1。此外,A、B的活性区域主要分布在咪唑环和亲水支链上,其分子头基能够有效驱替H2O分子从而使缓蚀剂起到缓蚀作用,缓蚀性能的理论评价结果与实验规律相一致。 相似文献
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ZX-1为一种低磷高效复合型缓蚀阻垢剂,为考察其对火电厂循环冷却水的缓蚀阻垢效果,对长春热电有限公司循环冷却水进行静态阻垢试验、极限碳酸盐试验、旋转挂片腐蚀试验和动态模拟试验.结果表明,补充水缓蚀阻垢剂投加量为15 mg/L,浓缩倍数为4.0时,阻垢率达98%以上,ZX-1对碳钢、不锈钢材质都有较好的缓蚀效果,各项指标... 相似文献
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The transport properties of ionic liquids (ILs) are crucial properties in view of their applications in electrochem-ical devices. One of the most important advantages of ILs is that their chemical–physical properties and conse-quently their bulk performances can be well tuned by optimizing the chemical structures of their ions. This will require elucidating the structural features of the ions that fundamentally determine the characteristics of the nanostructures and the viscosities of ILs. Here we showed for the first time that the“rigidity”, the order, and the compactness of the three-dimensional ionic networks generated by the anions and the cation head groups determine the formation and the sizes of the nanostructures in the apolar domains of ILs. We also found that the properties of ionic networks are governed by the conformational flexibility and the symmetry of the anion and/or the cation head group. The thermal stability of the nanostructures of ILs was shown to be con-trolled by the sensitivity of the conformational equilibrium of the anion to the change of temperature. We showed that the viscosity of ILs is strongly related to the symmetry and the flexibility of the constitute ions rather than to the size of the nanostructures of ILs. Therefore, the characteristics of the nanostructures and the viscosities of ILs, especially the thermal stability of the nanostructures, can be fine-tuned by tailoring the symmetry and the conformational flexibility of the anion. 相似文献
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磷尾矿中元素赋存状态研究方法的探讨 总被引:3,自引:0,他引:3
对磷尾矿中元素赋存状态的一些研究方法进行了讨论,通过讨论对磷尾矿的综合研究、合理开发利用、重新设计选冶工艺流程等领域都具有十分重要的意义。 相似文献
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Claver IP Zhang H Li Q Zhu K Zhou H 《International journal of molecular sciences》2010,11(8):3002-3015
Starches were isolated from soaked and malted sorghum and studied to understand their physicochemical and functional properties. The swelling power (SP) and the water solubility index (WSI) of both starches were nearly similar at temperatures below 50 °C, but at more than 50 °C, the starch isolated from malted sorghum showed lower SP and high WSI than those isolated from raw and soaked sorghum. The pasting properties of starches determined by rapid visco-analyzer (RVA) showed that malted sorghum starch had a lower viscosity peak value (86 BU/RVU) than raw sorghum starch (454 BU/RVU). For both sorghum, X-ray diffractograms exhibited an A-type diffraction pattern, typical of cereal starches and the relative degrees of crystallinity ranged from 9.62 to 15.50%. Differential scanning calorimetry (DSC) revealed that raw sorghum starch showed an endotherm with a peak temperature (Tp) at 78.06 °C and gelatinization enthalpies of 2.83 J/g whereas five-day malted sorghum starch had a Tp at 47.22 °C and gelatinization enthalpies of 2.06 J/g. Storage modulus (G') and loss modulus (G″) of all starch suspensions increased steeply to a maximum at 70 °C and then decreased with continuous heating. The structural analysis of malted sorghum starch showed porosity on the granule's surface susceptible to the amylolysis. The results showed that physicochemical and functional properties of sorghum starches are influenced by soaking and malting methods. 相似文献