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采用GCF型高压釜模拟350～560℃的高温水汽环境,研究了十八胺(ODA)分解特性和燃气机组高温管材T22及P91的ODA成膜特性.结果表明,ODA在高温下存在分解平衡,且产物无危害;ODA在350～560℃温度范围内均能在金属表面形成性能良好的保护膜,480℃时的成膜效果最佳;560℃时经ODA成膜后金属表面膜的保护性较自身氧化膜保护性提高数倍,证明不降温加ODA停炉保养是可行的.建议的最优工艺条件为:温度560℃、ODA浓度80 mg/L、pH为9.5及恒温时间2 h.膜层X射线光电子能谱分析表明,表面膜为含ODA的氧化铁层,ODA中N与Fe发生化学吸附形成保护膜.
The GCF-type autoclave was used to simulate the high temperature water vapor environment at 350-560 ℃, and the decomposition characteristics of octadecylamine (ODA) and the ODA film formation characteristics of T22 and P91 high-temperature gas pipes were studied. The results show that ODA has a decomposition equilibrium at high temperature, And the product is harmless. ODA can form a good protective film on the metal surface at the temperature range of 350-560 ℃, and the best film formation effect at 480 ℃. The protective effect of ODA film on the metal surface film at 560 ℃ Which is several times more protective than that of the oxide film, which proves that it is feasible to reduce the temperature without ODA shutdown and the best process conditions are as follows: temperature 560 ℃, ODA concentration 80 mg / L, pH 9.5 and constant temperature time 2 h. X-ray photoelectron spectroscopy analysis of the film showed that the surface film was an iron oxide layer containing ODA, and N and Fe in ODA were chemisorbed to form a protective film.