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针对土库曼斯坦某天然气田中酸性气体组成,以静态试验和动态试验对不同缓蚀剂进行筛选,用挂片失重法评价了缓蚀剂的缓蚀性能,并对温度及加药量进行了考察。缓蚀效果评价结果表明,新研制的缓蚀剂KO具有很好的防腐效果,可适用于酸性腐蚀介质。 相似文献
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延迟焦化工艺是目前渣油深度加工的主要手段,但在加工过程中会产生大量硫化氢气体并溶解于焦化酸性水中。在湿硫化氢环境中,硫化氢会电离,并与单质铁发生原电池反应,从而对设备造成严重腐蚀,常采用添加缓蚀剂的方法来减缓其对装置的腐蚀。目前评价缓蚀剂性能的指标是检测焦化酸性水中的铁离子含量,通常规定焦化酸性水中铁含量应小于3.0 mg/L。通过Fe S的溶度积,计算了不同p H值、不同H2S含量的水溶液中Fe2+的含量。结果显示:即使不添加缓蚀剂,焦化酸性水中Fe2+的理论最大浓度也不会高于现行标准中所规定的3.0 mg/L。比较可靠的缓蚀评价方法是将腐蚀挂片或腐蚀探针悬挂于管道设备内部,其监测数据能够比较真实体现腐蚀状况。 相似文献
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钼酸盐缓蚀剂在A20碳钢表面成膜行为研究 总被引:1,自引:0,他引:1
在标准配制水条件下,通过失重法、跟踪测定试验水中MoO42-和O2浓度及SEM形貌分析,研究了MoO42-对A20碳钢在循环冷却水中的缓蚀行为,分析其成膜机理。结果表明,钼酸盐在碱性水中具有一定缓蚀作用;是一种阳极型成膜剂,成膜过程分为诱导期、生长期和稳定期3个阶段。诱导期约24 h,生长期约48 h,药剂浓度愈高,愈有利于膜的生长。在稳定期,维持药剂质量浓度为100 mg/L即可;FeMoO4在生长期其晶核呈竹签状,在稳定期晶体呈玉米棒状。 相似文献
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防治金属腐蚀的五大对策 总被引:3,自引:0,他引:3
本文从理论和应用上概括介绍了防治金属腐蚀的五大对策,即隔离法,增大电极电势法,阴极保护法,改善腐蚀环境和介质(缓蚀剂法),以及研制开发新的耐腐蚀材料等。 相似文献
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金属贮罐及辅属设施劣化最常见的形式是遭受各种腐蚀,针对金属贮罐中常出现的腐蚀失效形式及其产生原因进行分析,总结若干种金属材料贮罐的腐蚀防护措施,并以一例腐蚀严重的液氯贮罐为例对抑制金属贮罐腐蚀的方法进行了讨论。 相似文献
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A. Ali Fathima Sabirneeza R. Geethanjali S. Subhashini 《Chemical Engineering Communications》2013,200(2):232-244
Several works have been reported on the corrosion inhibition of different metals in various corrosive environments. Initially attention was centered on organic compounds but later focused on green inhibitors. Green inhibitors include nontoxic, eco-friendly polymers and natural inhibitors. In recent years, there has been increased emphasis on applications of polymers, copolymers, grafted polymers, and polymer composites as green corrosion inhibitors. The prime controlling factors influencing the corrosion inhibitive performance of polymeric compounds on the corrosion of metals in various corrosive environments are discussed in this review. The superior performance of a polymeric corrosion inhibitor is due to its larger size and greater number of functional anchoring groups. Through the anchoring groups the polymers easily get adsorbed on the metal surface and cover considerably more surface than the corresponding monomers. The main factors influencing the corrosion mitigating properties of the polymers are molecular size, weight, composition, and nature of the anchoring groups. The solution pH, concentration, exposure time, and temperature also find their role in inhibition performance. In this review, we have tried to cover various types of polymeric corrosion inhibitors for iron and its alloys. 相似文献
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采用静态挂片失重法和电化学法考察了缓蚀剂的缓蚀性能,讨论了缓蚀剂加量、温度对腐蚀速率的影响。静态腐蚀评价可知:结果表明,温度为90℃时,在15%工业盐酸介质中N80钢片的腐蚀速率随着缓蚀剂加量的增大而减小、随着温度的升高而增大。当缓蚀剂的加量为1.0%时,仍可获得光亮钢片表面,该缓蚀剂对N80钢片的缓蚀率可达到98%。电化学极化曲线和交流阻抗图谱结果表明:该缓蚀剂对金属腐蚀的阴、阳极过程均有抑制作用,属于混合型缓蚀剂,缓蚀机理属于"负催化效应"。通过电镜扫描照片可知腐蚀容易发生在钢片有局部缺陷的地方,且缓蚀剂的加入可有效的在钢片表面形成保护膜,阻止了腐蚀介质与钢片的接触,抑制金属的腐蚀。 相似文献
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Environmentally Friendly Nonionic Surfactants Derived from Jatropha Oil Fatty Acids as Inhibitors for Carbon Steel Corrosion in Acidic Medium 下载免费PDF全文
Nabel A. Negm Emad A. Badr Khaled Zakaria Mohamed Abd El‐Raouf 《Journal of surfactants and detergents》2015,18(6):1011-1024
The inhibition effect of four novel environmentally friendly inhibitors (derived from vanillin and a fatty acid mixture obtained from the hydrolysis of Jatropha oil) on carbon steel corrosion in 0.5 M H2SO4 was investigated by weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS). The results show high efficiency of the inhibitors. The inhibition efficiency increases by increasing the polyethylene glycol chain length and the inhibitor concentration. From polarization curves, the inhibitors act as cathodic inhibitors. EIS spectra display a large capacitive loop at high frequencies followed by a large inductive loop at low frequencies. Environmental study shows inhibitors tendency towards biodegradation by the action of microorganisms after 28 days. 相似文献
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针对甲醇汽油对金属腐蚀性问题.制备了1种新的金属腐蚀抑制剂--H-G腐蚀抑制荆,进行了腐蚀抑制剂的实验室评定、台架试验及实际应用.介绍了甲醇汽油的腐蚀性及防止方法,探讨了H-G腐蚀抑制剂的防腐机理.结果表明.H-G腐蚀抑制剂对钢、铝、黄铜和紫铜等4种金属有较好的缓蚀效果:对甲醇汽油的动力性能和尾气排放没有明显影响,不会引入新的尾气污染物;甲醇汽油的储输配设施未见明显异常.是甲醇燃料的有效腐蚀抑制剂. 相似文献
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缓蚀剂类化学试剂生产对不锈钢设备的腐蚀 总被引:1,自引:0,他引:1
通过缓蚀剂类化学试剂生产对不锈钢设备的腐蚀及腐蚀对产品质量的影响分析,指出了设备腐蚀的原因,并在腐蚀机理的论述中,提出了硫脲异构体硫氰酸铵对设备的腐蚀机理及乌洛托品的水分解产物甲酸对设备的腐蚀机理;阐述了腐蚀产物对产品的质量带来的影响,提出了改善措施,并在生产设备、工艺、原料上进行了改进. 相似文献
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Mass transfer controlled corrosion of a copper pipe was studied using diffusion‐controlled dissolution of a copper tube in acidified potassium dichromate solution. The copper tube is considered as a plug flow and the reservoir through which recirculation takes place as an ideal stirred tank reactor. A model is formulated that enables to estimate the liquid phase mass transfer coefficient using the concentration‐time data. With the present experimental data, the Sherwood correlations are also found for different concentrations. 相似文献