碳钢和不锈钢在高温环烷酸介质中的腐蚀行为

采用失重法和表面分析研究了碳钢和不锈钢在高温环烷酸油介质中的腐蚀行为规律。结果表明：酸值和温度是影响金属环烷酸腐蚀行为的主要因素，其反应动力学遵循Arrhenius公式。腐蚀速度随着温度的上升而增加，同一温度下酸值影响气相腐蚀速度与液相腐蚀速度之间的关系。腐蚀速度与酸值的平方根成线性关系。随着腐蚀时间的增加，腐蚀速度迅速降低，最后趋于稳定的腐蚀速度。

HIGH TEMPERATURE NAPHTHENIC ACID CORROSION OF STEEL IN HIGH TAN REFINING MEDIA

Corrosion behavior of carbon steel and stainless steel in white oil withm naphthenic acid were studied under high temperature by mass loss method and surface analysis. Naphthenic acid corrosion (NAC) rates were directly related to experimental temperature and total acid number (TAN). The activation energy was calculated and the process kinetics could be represented by Arrhenius-type equation. The relationship between the isothermal line in liquid phase and that in vapor phase at different TAN values had a significant distinction with the change of temperature. The relationship between corrosion rate and square root of TAN is linear. The corrosion rate decreased sharply with the increase of exposure time from 1.5 h to 12 h, and then remained comparative steady state after 12 h. The findings have important implications for assessing the corrosivity of crude oils with high TAN value from various resources.