中文摘要：

采用高温高压冷凝反应釜模拟CO2湿气顶部腐蚀环境,研究了X70钢在不同腐蚀时间和温差条件下的腐蚀行为。采用SEM和EDS等分析方法究了腐蚀产物膜的宏观、微观形貌和结构特征,明确了湿气条件下腐蚀产物膜与局部腐蚀之间的关系,探讨了CO2湿气顶部腐蚀机理。结果表明,在不同的腐蚀时间条件下,X70钢的局部腐蚀与腐蚀产物膜脱落位置呈对应关系;在不同温差条件下,当腐蚀产物膜达到一定厚度后,腐蚀产物膜上也可能存在温度梯度,从而导致腐蚀膜更容易发生局部脱落。

英文摘要：

The corrosion behavior of X70 steel in static wet gas environment was investigated using a high-pressure high-temperature condensation autoclave,in order to simulate the corrosion environment of top line corrosion（TLC）.This experiment studied the influence of localized corrosion occurring on the surface of X70 steel in different test durations and different temperature differences.The composition and morphology of the corrosion scale were characterized by EDS and SEM.And the relationship between the formation of corrosion scale and localized corrosion in TLC was discussed.The results showed that the position of localized damage on corrosion scales corresponded with the position of localized corrosion after removal of corrosion scales.Under the condition of different temperature differences,when the corrosion scales reached a certain thickness,the temperature gradients maybe existed on the corrosion scales,which was more likely to cause corrosion scales to fall off.