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.硫酸铜点滴实验、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.
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