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麻福光 《中国石油和化工标准与质量》2013,(14):212
针对某工业区集输管网系统存在管线使用时间、管线集输内介质等因素的影响和制约而导致集输管线腐蚀穿孔严重的问题,采用多种方法多种角度对该区域管线分布特征、腐蚀机理进行分析和研究,探寻管线严重腐蚀以致管线穿孔的原因,主要为管线内结垢导致管线穿孔,同时聚驱采出液含聚浓度高和外界碱性土壤也加速了管线的腐蚀速度。 相似文献
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焦化装置液化气脱硫系统含氧尾气线设计为20#钢材质,在使用中管线腐蚀减薄严重,经分析主要是含氧尾气中的氧气、水与铁发生的吸氧腐蚀。 相似文献
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弯头在管路系统中主要起到改变介质流动方向的作用,是油气输送中最常用的管道部件之一。重点研究了液化气脱硫装置再生塔返塔管线弯头的腐蚀失效机制。从宏观和微观两个角度入手,研究了失效弯头部位的腐蚀孔孔径分布、减薄规律,进而利用X射线衍射(XRD)和扫描电镜-能谱仪(SEM-EDS)对样品进行了系统的理化分析。结果表明:沿流体流动方向,腐蚀逐渐加剧,在弯头的中部和出口形成完全破坏区;流体冲刷会破坏电化学腐蚀形成的产物保护膜,减弱产物膜对基体的保护作用,导致内壁不断被腐蚀,这是弯头腐蚀失效的主要原因。此外,热稳定性盐(HSS)的存在也加剧了弯头的腐蚀。 相似文献
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由于天然气中含有H_2S、CO_2和有机硫化物等酸性组分,因此天然气净化装置在常规的运行中极易受到含硫天然气的影响,导致装置的某些部位(再生塔及其内部构件、贫富液换热器、重沸器以及相连管线等)易出现较为严重的腐蚀。结合国内外关于H_2S、CO_2腐蚀行为的原因,针对性的分析了天然气净化装置腐蚀机理及其影响因素,提出了相应的脱酸气装置腐蚀防护措施,以提高管线和设备使用率和生产效率。 相似文献
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弯头在管路系统中主要起到改变介质流动方向的作用,是油气输送中最常用的管道部件之一。重点研究了液化气脱硫装置再生塔返塔管线弯头的腐蚀失效机制。从宏观和微观两个角度入手,研究了失效弯头部位的腐蚀孔孔径分布、减薄规律,进而利用X射线衍射(XRD)和扫描电镜-能谱仪(SEM-EDS)对样品进行了系统的理化分析。结果表明:沿流体流动方向,腐蚀逐渐加剧,在弯头的中部和出口形成完全破坏区;流体冲刷会破坏电化学腐蚀形成的产物保护膜,减弱产物膜对基体的保护作用,导致内壁不断被腐蚀,这是弯头腐蚀失效的主要原因。此外,热稳定性盐(HSS)的存在也加剧了弯头的腐蚀。 相似文献
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精脱硫系统是脱除水煤气中有机硫的气体净化装置,通过它将水煤气中的有机硫除去,为后系统变压吸附制一氧化碳装置提供合格的原料气,避免吸附剂中毒;但由于精脱硫设备R9401脱硫槽底部出口管线弯头出现腐蚀泄漏,对装置的安全运行形成了隐患,这就需要对管线弯头的腐蚀情况进行原因分析,彻底地把问题解决,真正地做到分析问题解决问题。 相似文献
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针对延安炼油厂年产量200万t催化裂化装置分馏塔顶空冷器内侧腐蚀问题,进行现场取样检测,配制模拟溶液,研究氯离子单一因素的变化对腐蚀结果的影响,选用了空冷管束常用的10钢、20钢和304不锈钢三种材料进行腐蚀试验。通过对试验的极化曲线和电化学阻抗的分析,得到氯离子对10#钢和20#钢的腐蚀机理相同;三种材料都会随着氯离子的加入,出现局部腐蚀点蚀,且随着氯离子浓度的增大都有腐蚀加剧的趋势;304钢随着氯离子浓度的变大,点蚀电位下降不明显,钝化膜变的不稳定。综合对比,304钢抗腐蚀性表现优于10#钢,10#钢优于20#钢,但10#钢对于氯离子变化更敏感。 相似文献
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为了进一步提高Ni-W-P合金镀层的硬度和耐蚀性,用脉冲电沉积法制备了(Ni-W-P)-TiO2复合镀层,并研究了镀液中TiO2加入量对镀层硬度和表面形貌的影响,且通过极化曲线和电化学阻抗谱研究了镀层在3.5%NaCl溶液中的耐蚀性能。结果表明,(Ni-W-P)-TiO2复合镀层的性能优于Ni-W-P镀层,而当镀液中TiO2质量浓度为6g/L时,复合镀层的硬度较高,表面形貌及耐蚀性能较优。自腐蚀电位较正,腐蚀电流密度较小,极化电阻较大,其交流阻抗谱对应的电阻值也较大。 相似文献
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Yanjun Li Weidi Cao Lianfeng Zhao Donghua Liu Jin Chen Yanzhi Cai Donghai Ding Guoqing Xiao 《International Journal of Applied Ceramic Technology》2022,19(4):2093-2103
Porous alumina, with monodispersed PMMA as pore former and Y2O3 as sintering additive, was prepared via a gel casting route with Isobam as a gelling agent. The effects of PMMA addition on its properties, including apparent porosity, bulk density, strength, permeability, and corrosion resistance to acid/alkali, were investigated. With PMMA addition increased, the apparent porosity and permeability were increased obviously, while strength and corrosion resistance to acid/alkali were deteriorated due to increased porosity. Higher firing temperature resulted in lower porosity, higher strength, lower permeability, and better corrosion resistance to acid/alkali. Coarser raw powders resulted in lower strength and higher permeability due to the coarser structure and larger pores of the fabricated samples. Because Y2O3 was used as a sintering additive, and no silica was introduced, the resulting samples possess better corrosion resistance to acid and alkali, especially much better corrosion resistance to alkali, than those reported with silica introduced. 相似文献
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The effect of Al on the galvanic ability of Zn-Al coating has been studied under thin electrolyte layers by measuring surface potential and surface pH. The changes of surface potential and surface pH over Zn-Al/steel galvanic couple corroding in artificial sea water (ASW) were measured at 60% and 90% RH at 298 K. In the initial stage of corrosion, Zn-55Al coating has shown better galvanic protection ability than Zn-5Al coating in both 60% and 90% RH. However, Zn-5Al coating was better in long term corrosion. The better galvanic ability of Zn-55Al coating in the initial stage of corrosion was related to the observation of pH as low as low as 2 on its surface. The low pH value was due to hydrolysis of Zn2+ and Al3+ ions. The low pH value was further confirmed by observing evolution of gas due to H+ reduction on the Zn-55Al coating. With the progress of corrosion, the low pH region of coating layer extended towards the base steel. This helped expand the deposition of zinc corrosion products on the steel surface. The enhanced dissolution of zinc in Zn-55Al coating led to the formation of a barrier layer which limited the galvanic protection of remaining steel. This was not the case in Zn and Zn-5Al coating. The X-ray analyses of the corroded samples have shown the deposition of zinc corrosion products on the steel surface, which greatly depended on the RH value. The part of the steel surface covered with zinc corrosion products has shown relatively less noble potential than other part indicating that zinc corrosion products took a role to protect the base steel against corrosion. The results from surface potential and surface pH measurements were substantiated by the surface observation of the corroded sample during and after the corrosion test. 相似文献
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通过复配实验筛选出一种不含NO2-的复配缓蚀剂,失重法实验表明,钢、铝、铜在含缓蚀剂的乙醇冷媒液中的腐蚀速度明显降低,当缓蚀剂浓度达到1.3%时,腐蚀速度近乎为零,有效地抑制了碳钢、紫铜和铝合金材料在冷媒液中的腐蚀,同时提高了冷媒液的沸点,改善了冷媒液的稳定性。 相似文献
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Lan-826缓蚀剂是一种多用型酸洗缓蚀剂,适用于氧化性酸、非氧化性酸及其混合酸液。但对于Lan-826缓蚀剂能否用于油水井酸化,以防止措施中酸液对设备及井下油、套管的腐蚀,还未见到相关报道。试验表明:Lan-826缓蚀剂具有较好的缓蚀性,且地层伤害较小,可满足油水井酸化的需要。 相似文献