常压塔塔顶冷凝系统NH_4Cl盐腐蚀机理的研究
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摘要
针对常压塔塔顶冷凝系统铵盐垢下腐蚀和露点腐蚀问题,提出了从微观角度研究碳钢在NH_4Cl多元腐蚀体系中的腐蚀机理,从微观离子层面探讨了NH~(4+)对碳钢腐蚀过程的影响及作用。采用电化学联合SEM/EDS、AFM和XRD等方法研究表面粗糙度、温度、溶解氧和pH等因素对碳钢腐蚀影响的规律,揭示多元腐蚀环境下的腐蚀机理,为塔顶腐蚀失效防控提供了理论基础和工程指导。
In order to investigate the corrosion problem of overhead condensing system of atmospheric tower, the corrosion mechanism of carbon steel in NH_4Cl multi-element corrosion system was studied from the microscopic perspective, and the effect of NH~(4+) on the corrosion process of carbon steel was analyzed from the microscopic ion level. The effect of surface roughness,temperature, dissolved oxygen and pH on the corrosion of carbon steel was investigated by electrochemical methods, such as SEM/EDS, AFM and XRD. The corrosion mechanism under multi-element corrosion environment was revealed. The paper can provide theoretical basis and engineering guidance for the prevention and control of corrosion failure on the top of the tower.
In order to investigate the corrosion problem of overhead condensing system of atmospheric tower, the corrosion mechanism of carbon steel in NH_4Cl multi-element corrosion system was studied from the microscopic perspective, and the effect of NH~(4+) on the corrosion process of carbon steel was analyzed from the microscopic ion level. The effect of surface roughness,temperature, dissolved oxygen and pH on the corrosion of carbon steel was investigated by electrochemical methods, such as SEM/EDS, AFM and XRD. The corrosion mechanism under multi-element corrosion environment was revealed. The paper can provide theoretical basis and engineering guidance for the prevention and control of corrosion failure on the top of the tower.
引文
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[4]George KS,Ne?i?S.Investigation of carbon dioxide corrosion of mild steel in the presence of acetic acid-Part 1:basic mechanisms[J].Corrosion,2007,63(2):178-186.
[5]Yan Y,Wang X,Zhang Y,et al.Molecular dynamics simulation of corrosive species diffusion in imidazoline inhibitor films with different alkyl chain length[J].Corrosion Science,2013,73(13):123-129.
[6]王海博.炼油常压塔冷凝系统腐蚀机理研究与离子平衡模型应用[D].西安:西安交通工大学,2018.