复合硅烷膜及双层硅烷膜对Mg-Gd-Y稀土镁合金耐蚀性的影响  

Effects of Composite and Dual-layer Silane Films on the Corrosion Resistance of Mg-Gd-Y Rare Earth Magnesium Alloys

作　　者：谢陈凯 金建港 张立军 林才渊 XIE Chenkai;JIN Jiangang;ZHANG Lijun;LIN Caiyuan(Shanghai Spaceflight Precision Machinery Institute,Shanghai 201600,China)

机构地区：[1]上海航天精密机械研究所,上海201600

出　　处：《上海航天(中英文)》2025年第1期102-109,共8页Aerospace Shanghai(Chinese&English)

基　　金：国家自然科学基金资助项目(52405391)。

摘　　要：针对镁合金耐蚀性方面的劣势,基于Mg-Gd-Y稀土镁合金的存储期及工序间腐蚀问题,利用硅烷化表面处理技术以提高镁合金耐蚀性。在传统单一硅烷膜的基础上,开发了多种硅烷复合而成的复合硅烷膜和双层硅烷膜,对其膜层结构做出了解释,并用电化学试验和浸泡试验进行耐蚀性试验验证。结果表明:复合及双层硅烷膜相较于单一硅烷膜,其自腐蚀电流密度降低了一个数量级,在质量分数为3.5%的NaCl溶液中腐蚀时间由24 h提升到了168 h。In response to the disadvantages of magnesium alloy corrosion resistance,based on the storage period and inter process corrosion issues of Mg-Gd-Y rare earth magnesium alloys,a silanization surface treatment technology is developed to improve the corrosion resistance of magnesium alloys.On the basis of traditional single silane films,composite silane films and dual-layer silane films composed of multiple silane composites are developed,and their film layer structures are explained.Electrochemical and immersion tests are conducted for corrosion resistance verification.The results show that compared with a single silane film,the self-corrosion current densities of the composite and duallayer silane films are decreased by an order of magnitude.The corrosion time in the NaCl solution with a mass fraction of 3.5%increases from 24 h to 168 h.

关 键 词：硅烷化 稀土镁合金 耐蚀性 复合膜 表面处理 

分 类 号：TG178[金属学及工艺—金属表面处理]