摘要
为了改善镁合金无铬转化膜耐蚀性能，采用正交试验法确定压铸镁合金无铬转化的优化处理工艺，讨论了工艺参数对转化膜性能的影响机制，并通过SEM，EDS，XRD等方法分析了优化工艺转化膜的微观形貌、化学成分和相组成。研究表明：当A剂80g／L；B剂2g／L；C剂1g／L时转化膜的耐蚀性能最佳；在优化工艺条件下，转化膜由底层、致密的中间层以及由大量的宽度为1～3μm纵横交错的“裂纹”所分割成的小岛表层组成。表面成分由Mg，Al，O，P及少量的Ca和V元素组成，物相则主要由Mg，Mg17A112及不定形相组成。
In order to improve corrosion resistance of chrome-free conversion films on magnesium alloys, the process parameters of chrome-free conversion on die casting magnesium alloy had been optimized by orthogonal experiment. The effects of process parameters on properties of conversion film were discussed, and the morphology, chemical composition and phase structure were analyzed by SEM, EDS, XRD. The results show that the optimum corrosion resistance of films is acquired when the conversion solution concentration is as follows： 80 ＂cracks＂ with 1-3 μm width. Furthermore,the chemical composition of film surface consists of Mg, Al, O and P, as well as a small amount of Ca and V, while the phases compose of Mg, Mg17Al12 and amorphous phase.
出处
《表面技术》
EI
CAS
CSCD
北大核心
2010年第2期70-73,共4页
Surface Technology
基金
广东省教育部产学研结合项目(2009B090300319)
重庆市科技攻关项目(CSTC2009AB4010)
关键词
镁合金
无铬转化膜
耐蚀性
工艺优化
] magnesium alloy
chrome-free conversion film
corrosion resistance
process optimization
