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通过化学浸渍在Al管表面钝化生成一层致密疏水的有机杂化膜.疏酸铜点滴实验、析氢实验和铜盐加速乙酸盐雾试验都表明,杂化膜显著提高了Al管的耐腐蚀性能,耐蚀效果超过了铬酸盐钝化膜.电化学Tafel极化曲线和交流阻抗谱(EIS)测定表明,杂化膜使Al的自腐蚀电位正移,阻抗值增大,自腐蚀电流密度降低,有效降低了Al的腐蚀速率.附着力及弯折性能实验结果表明,杂化膜具有良好的附着力和耐弯折性能.SEM和AFM对杂化膜表面形貌分析显示,杂化膜表面均匀、致密和平整,膜层由大量无定形的固体颗粒沉积而成,覆盖度高.EDS检测发现,杂化膜主要包含Al,C,O,Si和P等元素.成膜和耐蚀机理分析表明,有机掺杂钝化液中各组分间发生了反应,在Al管表面起到协同钝化作用,均匀成膜,从而有效增强了Al管的耐腐蚀性能.
The passivation of the surface of the Al tube by chemical immersion resulted in a dense and hydrophobic organic hybrid membrane.The experiments of dripping copper nitrate, hydrogen evolution experiment and copper salt accelerated acetic acid salt fog test showed that the hybrid membrane significantly improved the resistance of the Al tube The corrosion resistance and corrosion resistance of the films are higher than that of the chromate passivation film.The electrochemical Tafel polarization curves and the electrochemical impedance spectroscopy (EIS) measurements show that the self-corrosion potential of Al is shifted positively, the resistance value increases, The current density is reduced and the corrosion rate of Al is reduced effectively.Experimental results of adhesion and bending properties show that the hybrid films have good adhesion and bending resistance.SEM and AFM analysis of surface morphology of hybrid films show that hybrid The surface of the film is uniform, dense and smooth, the film is deposited by a large number of amorphous solid particles, the coverage is high.EDS test found that the hybrid film mainly contains elements such as Al, C, O, Si and P. The film formation and Corrosion-resistant mechanism analysis showed that the organic doping passivating solution in the reaction between the components in the Al tube surface synergistic passivation, uniform film, which effectively enhanced the corrosion resistance of the Al tube.