紫外辐射对2024铝合金表面钛盐转化膜形成的影响  

Effect of UV Irradiation on the Formation of Titanium-salt Conversion Coating on Al 2024

作　　者：张力[1] 郭瑞光[1] 房新建[1] 王娜娜[1] 

机构地区：[1]西安建筑科技大学西北水资源与环境生态教育部重点实验室,西安710055

出　　处：《表面技术》2012年第1期1-4,16,共5页Surface Technology

基　　金：国家自然科学基金(20976143);教育部高等学校博士学科点专项科研基金(20096120110007)

摘　　要：采用由硫酸氧钛、氟化钠为主盐的转化液,在60℃,pH 5～5.5及紫外光照射条件下处理5min,在2024铝合金表面制备了一种钛盐转化膜,中性盐雾时间超过96h。EDS和XPS分析结果表明,转化膜主要由O,Ti,Al,F,Mg及Cu等元素组成,转化膜中的Ti主要以TiO2的形式存在。电化学测试结果表明,紫外照射条件下,转化反应处理的2024铝合金腐蚀电位正移和阳极钝化区形成,使得2024铝合金惰性、防腐性能显著增强。A titanium-salt conversion coating, which was prepared on A1 2024 with a conversion solution made mainly of TiOSO4, NaF under the condition of 60℃, pH 5-5.5, UV irradiation and 5 minutes, could undergo more than 96 h of neutral salt spray test. The energy disperse spectroscopy （EDS） and x-ray photoelectron spectroscopy （XPS） analysis showed that the primary elements of conversion coating were O, Ti, Al, F, Mg, Cu and Ti element mainly existed in the form of TiO2. The result of electrochemical tests demonstrated that the more positive corrosion potential and an anode passivation area formation of 2024 Al alloy treated by conversion reaction under UV irradiation made the corrosion resistance of 2024 Al alloy improved significantly.

关 键 词：2024铝合金 转化膜 钛盐 紫外辐射 

分 类 号：TG174.45[金属学及工艺—金属表面处理]