为了提高铝合金表面的耐蚀性和与有机涂层的粘接耐久性,首先对铝合金进行水煮(65℃、15 min)处理,在其表面形成富含羟基氢氧化物层,然后经两步浸涂后再高温固化(100℃×60min),在被氧化的铝合金表面形成了双-[3-(三乙氧基)硅丙基]四硫化物(BTSPS)和γ-缩水甘油醚丙基三甲氧基硅烷(GPTMS)复合硅烷化膜层.用反射吸收红外光谱、俄歇电子能谱(AES)和扫描电子显微镜(SEM)对复合膜层进行分析和表征.结果表明,在富含羟基氢氧化物的铝合金表面与BTSPS内膜层形成Al-O-Si共价键网络,BTSPS内层与GPTMS外层形成Si-O-Si共价键网络,环氧乙基位于复合膜层最外层.
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