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.
By using a simulating of water-steam system at 350~560℃, the decomposition of octadecylamine was investigated, and the ODA film formation characteristics were studied for the T22 and P91 heat exchange pipes used in gas fired generating units. It was shown that Octadecylamine had a decomposing equilibrium at high temperature and the decomposition products didn't include harmful organic substances such as low molecular organic acids. Octadecylamine promoted formation on the steels of a good protective film in the range of 350~560℃ with the best film at 480℃. The protection property of the film formed with ODA at 560℃ was much better than that without ODA, which suggested the probability of application of octadecylamine for shutdown protection of heat exchange pipes without cooling in gas fired generating units. The optimal conditions were as follow: 560℃, 80 mg/L ODA, pH 9.5 and 2 h. The surface film was supposed to be a compound of ferroferric oxide and octadecylamine through analysis of X-ray photoelectron spectroscopy.
参考文献
| [1] | 龚洵杰. 热力设备的腐蚀与防护[M]. 北京: 中国电力出版社,1998.[2] Rohani-Rad A, Mofidi J, Modaress-Tehrani Z. Anticorrosive behaviour of octadecylamine for protection of boiler surfaces[J].Corros. Eng. Sci. Technol., 2003, 38(1):79.[3] 李永立, 王应高, 莫逆等. 600MW直接空冷机组停用防锈保护措施[J]. 材料保护, 2008, 41(10):57.[4] 张玉福. 热力设备停(备)用期间成膜胺防腐的应用技术[J].中国电力, 2001, 34(6): 28-30, 80.[5] 刘建平, 李正奉, 周晓湘.十八胺乳状液在热力设备停用保护中的应用研究[J]. 材料保护, 2002,35(3): 27.[6] 刘建平, 姚小露, 李正奉.热力设备停用保护缓蚀剂的研究与应用[J]. 腐蚀科学与防护技术, 2002,14(3): 161.[7] 张俊豪, 孔庆红, 陆卫良等.单分散四氧化三铁亚微球的合成、表征及磁性研究[J]. 科学通报, 2009, 54:1529.[8] 陆丽园, 杨磊. 十八胺改性硝酸铵的作用机理研究[J]. 火工品,2010, (2): 41. |
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