摘要
用浸渍法在50℃制备了硅烷有机缓蚀剂复合膜,并添加尿素对钝化膜耐蚀性进行改善。采用析氢实验、盐雾试验和电化学测试对铝管表面两种复合膜耐蚀性能进行对比。盐雾试验结果表明,复合膜具有较好的耐蚀性,添加少量尿素后的复合膜耐蚀性显著提高。Tafel极化曲线和交流阻抗测试结果表明,与空白相比,复合膜自腐蚀电流降低了两个数量级,阻抗值提高了近5倍。添加尿素后,复合膜自腐蚀电流降低三个数量级,阻抗值提高了7倍。SEM图显示添加尿素的复合膜较均匀致密,能谱图显示膜层主要由Al,C,O,Si,P和少量N组成,并初步探讨了耐蚀性机理。
Silane-organic inhibitor composite film was prepared by impregnation at 50 ℃,and urea was added to improve the film.Corrosion resistance of aluminum tube surface with these two films were studied by collecting hydrogen experiment,neutral salt spray test and electrochemical methods.The neutral salt spray test results show the composite film has good corrosion resistance.And the corrosion resistance improved greatly by adding a small amount of urea.Tafel curves and electrochemical impedance spectroscopy indicate,compared with the blank the corrosion current density of composite film reduced by two orders of magnitude,impedance increased by nearly five times.The values of urea-containing film were three and seven.Scanning electron microscope（SEM） observation show urea-containing film was well-distributed and dense,energy spectrum show the urea-containing film was mainly composed of Al,C,O,Si,P and a little of N.The corrosion protection mechanism of the film was discussed.
出处
《应用化工》
CAS
CSCD
2010年第12期1874-1877,共4页
Applied Chemical Industry
关键词
铝管
硅烷
复合膜
缓蚀剂
耐蚀性
aluminum tube
silane
composite film
corrosion inhibitor
corrosion resistance
