不同添加剂对镁合金锡酸盐转化膜耐蚀性的影响  

Effects of Different Additives on Corrosion Resistance of Stannate Chemical Conversion Coatings on Magnesium Alloy

作　　者：崔作兴 戴诗行 邵忠财[2] CUI Zuoxing;DAI Shihang;SHAO Zhongcai(School of Environment and Ecology,Liaoning Geology Engineering Vocational College,Dandong 118303,China;School of Environmental and Chemical Engineering,Shenyang Ligong University,Shenyang 110159,China)

机构地区：[1]辽宁地质工程职业学院环境与生态系,辽宁丹东118303 [2]沈阳理工大学环境与化学工程学院,辽宁沈阳110159

出　　处：《电镀与环保》2019年第3期45-48,共4页Electroplating & Pollution Control

摘　　要：研究了不同添加剂对镁合金锡酸盐转化膜耐蚀性的影响。通过单因素试验,得出了镁合金锡酸盐化学转化的最优配方:锡酸钠25 g/L,焦磷酸钠35 g/L,乙酸钠7 g/L,氢氧化钠7 g/L,EDTA 0.3 g/L,温度70℃,时间80 min。5种添加剂中,EDTA对镁合金锡酸盐转化膜耐蚀性的提高效果最显著。最优配方下得到的锡酸盐转化膜晶粒细小、均匀,堆积十分紧密,无缝隙,其相组成为Mg、Al12Mg17和MgSn(OH)6。The effects of different additives on the corrosion resistance of stannate chemical conversion coatings on magnesium alloy were studied.Through the single factor experiment,the optimum formula of stannate chemical conversion for magnesium alloy was determined as follows:sodium stannate 25 g/L,sodium pyrophosphate 35 g/L,sodium acetate 7 g/L,sodium hydroxide 7 g/L,EDTA 0.3 g/L,temperature 70℃,time 80 min.Of the five additives,the effect of EDTA on the corrosion resistance of the stannate conversion coating on magnesium alloy was more remarkable.The stannate conversion coating obtained with optimum formula was fine and uniform,the grains arranged closely without cracks.The coating was mainly composed of Mg,Al(12)Mg(17),and MgSn(OH)6 phases.

关 键 词：锡酸盐 镁合金 添加剂 

分 类 号：TG174[金属学及工艺—金属表面处理]