热处理对锌-镍-磷-纳米二氧化硅复合电镀层性能的影响  

Effect of heat treatment on properties of electroplated zinc-nickel-phosphorus-nano-silica composite coating

作　　者：苏琪 刘军松 刘定富[1] 吕小虎 SU Qi;LIU Jun-song;LIU Ding-fu;LYU Xiao-hu(School of Chemistry and Chemical Engineering,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学化学化学与化工学院

出　　处：《电镀与涂饰》2019年第23期1271-1274,共4页Electroplating & Finishing

摘　　要：先采用由110 g/L ZnCl2、100 g/L NiCl2·6H2O、80 g/L CH3COONH4、40 g/L CH3COONa、5~10g/L NaH2PO2·H2O、180 g/L KCl、0.04~0.08 g/L十二烷基硫酸钠和4~6 g/L纳米SiO2(平均粒径7~40 nm)组成的镀液,在pH为4~5、温度为45℃和电流密度为1.5 A/dm2的条件下电镀20 min得到厚度为30~40μm的Zn-Ni-P-纳米SiO2复合镀层。然后在氮气保护和不同温度(200、300、400和500℃)下热处理2 h。研究了热处理温度对复合镀层微观结构、显微硬度和耐蚀性的影响。结果表明,经300℃热处理的Zn-Ni-纳米SiO2复合镀层的综合性能较好,显微硬度为198 HV,耐蚀性最好。A Zn-Ni-P-nano-SiO2 composite coating with a thickness of 30-40 μm was prepared by electroplating in bath comprising ZnCl2 110 g/L,NiCl2·6 H2 O 100 g/L,CH3 COONH4 80 g/L,CH3 COONa 40 g/L,NaH2 PO2·H2 O 5-10 g/L,KCl180 g/L,sodium dodecyl sulfate 0.04-0.08 g/L,and nano-SiO2 with an average diameter of 7-40 nm 4-6 g/L at temperature45℃,pH 4-5,and current density 1.5 A/dm2 for 20 min,and then treated in nitrogen atmosphere at different temperatures(200,300,400,or 500℃) for 2 h.The effect of heat treatment temperature on microstructure,microhardness,and corrosion resistance of the composite coating was studied.The results showed that the Zn-Ni-P-nano-SiO2 composite coating treated at 300℃had a microhardness of 198 HV and the best corrosion resistances,showing a good comprehensive performnce.

关 键 词：锌-镍-磷合金 纳米二氧化硅 复合电镀 热处理 显微结构 耐蚀性 显微硬度 

分 类 号：TQ153.2[化学工程—电化学工业]