摘要
为了提高铝合金的耐蚀性能,采用化学刻蚀与阳极氧化相结合的方法在铝合金表面构造了微纳结构,经进一步化学修饰后得到耐蚀性能良好的表面防护膜层。利用扫描电子显微镜、红外光谱仪表征所制备膜层的表面形貌和化学成分,采用激光共聚焦显微镜测定样品的表面粗糙度,通过接触角测量仪和电化学工作站对膜层的润湿性和防腐性能进行表征,考察刻蚀时间对于膜层表面结构和耐蚀性能的影响规律。结果表明:当刻蚀时间为3min时,膜层的耐蚀性能最佳:相对于未经刻蚀的样品腐蚀电位正移了0.15V,腐蚀电流下降了两个数量级。且接触角最大(152°),这是由于此条件下制备的薄膜表面微/纳结构最完整、比例最合理。
To improve corrosion resistance performance of aluminum alloy, micro/nanostructures were formed by chemical etching and anodic oxidation methods on the surface of aluminum alloy. Then, anodic oxidation films with excellent anticorrosion performance were obtained after being chemically modified via a selfassembly layer to improve the corrosion resistance of aluminum alloys. The surface morphologies and chemical elements of the asprepared films were investigated by infrared spectroscopy and SEM. The values of surface roughness were measured by laser scanning confocal microscope. The hydrophilic/hydrophobic and anticorrosion properties of the films were characterized by optical contact angle meter and electrochemical workstation. The influence of etching time on the surface morphologies and anticorrosion performance was investigated. The results show that when the etching time is 3 min, the film owns the best corrosion resistance performance, the corrosion potential shifted 0.15 V positively, the corrosion current density decreased two orders of magnitude compared to bare aluminum alloy, and the static contact angle is 152°at its maximum which is due to the intact and suitable ratio of the micro/nanostructure of the films under this preparation condition.
出处
《中国表面工程》
EI
CAS
CSCD
北大核心
2015年第3期82-89,共8页
China Surface Engineering
基金
国家重点基础研究发展计划(973计划)(2014CB643305)
国家自然科学基金(51202263
51335010)
浙江省"海洋防护材料与工程技术"科技创新团队(2011R50006)
宁波市自然科学基金(2014A610132)
关键词
化学刻蚀
阳极氧化
表面形貌
耐蚀性
chemical etching
anodization
surface morphology
anti-corrosion property
