铝合金表面氟铝酸钠转化膜改性研究  

Modification Research of Sodium Fluoroaluminate Conversion Coating on Aluminum Alloy

作　　者：全先厚[1] 郭瑞光[1] 唐长斌[1] 卢双堡[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》2013年第3期59-62,共4页Surface Technology

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

摘　　要：对6063铝合金的氟铝酸钠转化膜进行了改性,确定改性后的最佳工艺条件为:氟化钠7.5 g/L,硅酸钠5 g/L,六偏磷酸钠3 g/L,偏钒酸铵5 g/L,pH值3.0～4.0,常温,转化时间20 min。采用该工艺对铝合金进行转化处理,极化曲线测试结果表明,铝合金表面的腐蚀电位正移了大约70 mV,腐蚀电流密度减小了大约90%,耐蚀性显著提高,耐中性盐雾时间可达264 h。Sodium fluoroaluminate conversion coating on the surface of 6063 aluminum alloy was modified.The optimal operation parameters were as follows： NaF 7.5 g/L,Na2SiO3 5 g/L,（NaPO3）6 3 g/L,NH4VO3 5 g/L,pH 3.0-4.0,ordinary temperature,20 minutes.After conversion treatment by the process,the polarization curve measurement of the Al alloy showed that corrosion potential increased by about 70 mV and corrosion current density decreased by about 90%,the corrosion resistance of the Al alloy was improved obviously,the neutral salty test time of Al specimen reached up to 264 hours.

关 键 词：6063铝合金 氟铝酸钠转化膜 硅酸钠 耐蚀性 

分 类 号：TG174.45[金属学及工艺—金属表面处理]