铝阳极氧化膜原位偶合反应着色工艺研究

Study of the Method for Coloring on Aluminum Anodic Oxide Films by Coupling Reaction

在铝阳极氧化(AAO)膜表面,通过N,N′-二苯基丙二酰胺衍生物与取代苯基重氮盐的原位偶合反应,得到有色的取代苯偶氮N,N′-二苯基丙二酰胺衍生物,使AAO膜呈黄色。研究结果表明,氧化膜的制作工艺为:电流密度3～3.5A/dm2(AC),温度25～35℃,时间为1h;偶合反应的条件为:DMF为溶剂,六氢吡啶为催化剂,温度0～10℃,反应时间5～20min。性能测试结果表明:着色膜层厚度大于20μm;168h耐盐雾实验腐蚀评级为10级,240h的耐交变湿热实验试片膜层无变化,连续730天自然气候暴露实验试片不变色,不腐蚀,具有较好的防护装饰效果。

Aluminum anodic oxide（AAO） films can be colored by a color pigment phenylazo-N,N-diphenyl propanicn diamide derivative,which is made through coupling reaction between N,N-diphenylpropanediamide derivatives and phenyl diazonium chloride on the AAO films.The process parameters for making AAO colored films and the property of AAO colored films were studied.The results show that the AAO films made under experiment conditions,ampere density 3-3.5A/dm2（AC）,reaction temperature 25-35℃ for 1h,can be colored easily;The coupling conditions for coloring the AAO films are reaction temperature 5-10℃ and reaction time 5-20min,piperidine as catalysis,DMF as solvent.The test results shown that the thickness of colored films is 20μm.The study on protection properties shown that the colored films has permanent protective property： the grade of 168h salt spray test is 10;there is no change of the films during the 240h alternate hygrothermal test;the eroded grade of continuous 730 days nature-exposure test is 10.So the colored films has permanent protective and decoration properties.