铝合金磷化膜性能的研究  

Properties of Phosphating Coating on Aluminium Alloy

作　　者：王昕[1] 李思昊[1] 任广军[1] 

机构地区：[1]沈阳理工大学环境与化学工程学院,辽宁沈阳110159

出　　处：《电镀与精饰》2012年第1期36-38,共3页Plating & Finishing

摘　　要：采用中温锌系磷化工艺对LY12硬铝合金进行磷化处理获得磷化膜。通过硫酸铜点滴试验,电化学测试等考查了磷化膜的耐蚀性;利用扫描电子显微镜、能谱仪等对磷化膜的表面形貌、化学成分进行分析。结果表明,该磷化膜外观颜色呈浅灰色,均匀光亮,耐蚀性好,硫酸铜试验耐蚀t为63 s,线性极化电阻为4.174 kΩ;表面形貌为片状晶体层层堆积形成的磷化膜结构,膜层的元素组成主要是Zn、P、O,磷酸锌为磷化膜的主要物质。The phosphating coating were obtained by zinc phosphating system on LY12 aluminum alloy under medium temperature. Corrosion resistance of the coating was investigated by copper sulfate titration and electrochemical tests, surface morphology and composition of the coating were observed and deter- mined by SEM and EDS respectively. Results showed that the phosphating coating was in light grey col- or, bright and uniform with higher corrosion resistance. In dropping experiment, color of the coating was changed after 63 seconds, and linear polarization resistance is about 4. 174 kΩ. The phosphating coating was in flake like structure, which composed by zinc, phosphorous and oxygen in the phase of zinc phos-phate.

关 键 词：铝合金 锌系磷化 磷化膜性能 

分 类 号：TQ153.2[化学工程—电化学工业]