15CrMo在含NaCl高温高压水/水蒸气中的腐蚀行为

Corrosion behavior of 15CrMo steel exposed in saline (NaCl) water/steam at high temperature and pressure

为研究15CrMo钢在高温高压含NaCl工质中的腐蚀行为,搭建了高温高压反应釜实验台。利用SEM,EDS,XRD测试方法对在不同工况下的15CrMo腐蚀样品进行了分析。结果表明,当腐蚀温度为280℃时,相比于饱和水,Fe_(3)O_(4)的晶体结构在饱和蒸汽中的生成速率更快。当腐蚀温度上升到360℃时,15CrMo在含盐饱和蒸汽与含盐饱和水中腐蚀产物的晶体结构均已无明显变化,其表面的晶体结构各自趋于稳定。在饱和蒸汽中FeOCl的生成反应对温度变化的敏感性较高,温度为280℃时,该生成反应仅在腐蚀工质为含盐饱和水时发生,而在360℃,含盐饱和蒸汽中的样品表面也能够发生。在280~360℃,15CrMo在含NaCl饱和水中的腐蚀程度相较其在饱和蒸汽中更高。

In order to study the corrosion behavior of 15CrMo in saline(NaCl)medium at high temperature/pressure,a high temperature and high pressure autoclave test bench was built.The corroded samples under different conditions were analyzed by SEM,EDS and XRD.The results show that the formation rate of Fe_(3)O_(4) crystal structure in saturated steam is faster than that in saturated water at 280℃.When the temperature rises up to 360℃,the crystal structures of the corrosion products in both steam and water have not changed significantly.The crystal structures on their surface tend to be stable.The formation reaction of FeOCl in saturated steam is highly sensitive to temperature.It occurs only when the medium is saline saturated water at lower temperatures(T=280℃).At high temperature(T=360℃),the reaction can also occur on the sample surface in saline saturated steam.In the range of experimental temperature(280~360℃),the corrosion of 15CrMo in saturated water containing NaCl is more severe than that in saturated steam.