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首页> 外文期刊>International Journal of Electrochemical Science >Electrochemical Investigation of Corrosion of Mild Steel in NH4Cl Solution
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Electrochemical Investigation of Corrosion of Mild Steel in NH4Cl Solution

机译：NH 4 Cl溶液中低碳钢腐蚀的电化学研究

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The corrosion from NH4Cl salt is an important reason for the failure of petroleum refining equipmentmade of mild steel, especially crude tower overhead system including tower top, overhead piping, andexchanger. The factors affecting the corrosion environment include the surface roughness, dissolvedoxygen, temperature, concentration of NH4Cl, corrosion time, pH, and partial pressure of CO2. Theeffects of these environmental factors on the NH4Cl corrosion of carbon steel were investigated byelectrochemical impedance spectroscopy (EIS) and polarization measurements. The EIS resultsshowed that the corrosion process was mainly controlled by the charge transfer process. Thepolarization measurement results showed that the corrosion rates increased with increasing surfaceroughness and temperature, but decreased with increasing pH. Decreasing the dissolved O2 canaccelerate the corrosion rate. Cl- accelerated the dissolution of iron while the NH4Cl concentration is inthe range of 0–1 mol%; and the adsorption of nitrogen in NH4+ inhibited the dissolution of iron in 2.5mol% NH4Cl solution. The X-ray diffraction surface spectroscopy analysis exhibited that the corrosionproducts comprise Fe2O3, Fe3O4, and FeOOH. Besides, the increased CO2 partial pressure sloweddown the corrosion rate of carbon steel in NH4Cl solution, and the corrosion environment favored theformation of FeCO3 film. This is the first comprehensive study on the effect of corrosion factors on thecorrosion rate and will provide guidance for operating conditions in real-time analyses.
机译：NH4Cl盐的腐蚀是低碳钢制石油精制设备尤其是塔顶，架空管道和交换器等粗塔架空系统失效的重要原因。影响腐蚀环境的因素包括表面粗糙度，溶解氧，温度，NH4Cl浓度，腐蚀时间，pH和CO2分压。通过电化学阻抗谱（EIS）和极化测量研究了这些环境因素对碳钢NH4Cl腐蚀的影响。 EIS结果表明，腐蚀过程主要受电荷转移过程控制。极化测量结果表明，腐蚀速率随表面粗糙度和温度的升高而增加，但随pH值的升高而降低。减少溶解的氧气可以加快腐蚀速度。 Cl-加速了铁的溶解，而NH4Cl的浓度在0-1 mol％的范围内。氮在NH4 +中的吸附抑制了铁在2.5mol％NH4Cl溶液中的溶解。 X射线衍射表面光谱分析显示腐蚀产物包括Fe 2 O 3，Fe 3 O 4和FeOOH。此外，增加的CO2分压使碳钢在NH4Cl溶液中的腐蚀速率减慢，腐蚀环境有利于FeCO3膜的形成。这是关于腐蚀因子对腐蚀速率影响的首次综合研究，将为实时分析中的操作条件提供指导。

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