低碳钢表面稀土改性化学镀镍-锌-磷  

Rare Earth Modified Electroless Nickel-zinc-Phosphorous Plating on Surface of Low Carbon Steel

作　　者：刘停[1] 邹友琴[2] 蒋柏泉[1,2] 陈正平[1] 刘贤相[2] 

机构地区：[1]南昌大学科学技术学院理工学科部生物化学系,江西南昌330029 [2]南昌大学资源环境与化工学院,江西南昌330031

出　　处：《稀土》2016年第6期20-25,共6页Chinese Rare Earths

基　　金：江西省重大科研专项计划(20124ABE02104)

摘　　要：研究了在基础镀液中添加镧系稀土化合物改善化学镀Ni-Zn-P的工艺和产品性能。首先采用单因素实验方法考察了基础镀液组成和工艺条件对Ni-Zn-P镀层的沉积速率和耐蚀时间的影响,确定了所有试剂的最佳组成浓度分别为:六水合硫酸镍27 g·L^(-1)、次亚磷酸钠16 g·L^(-1)、柠檬酸钠二水合物90 g·L^(-1)、七水合硫酸锌8 g·L^(-1)、氯化铵46 g·L^(-1),硫酸镉2×10^(-3)g·L^(-1),最佳操作条件分别为pH 9.0和温度90℃。然后重点考察了基础镀液中添加不同浓度的镧系稀土化合物氧化镧、硫酸高铈和氧化镱对镀层的沉积速率、外观形貌、耐腐蚀能力和晶相结构等性能的影响。结果表明,上述性能均随着三种稀土化合物浓度的增加呈先改善而后减弱的趋势,最适宜的浓度分别确定为10×10^(-3)g·L^(-1)、15×10^(-3)g·L^(-1)和15×10^(-3)g·L^(-1)。与基础镀液比较,在添加最适宜浓度的上述三种稀土化合物的情况下,可分别使沉积速率从3.7×10^(-3)g·cm^(-2)·h^(-1)提高至4.3×10^(-3)g·cm^(-2)·h^(-1)、4.4×10^(-3)g·cm^(-2)·h^(-1)和4.5×10^(-3)g·cm^(-2)·h^(-1),耐蚀时间从240 h延长至300 h、275 h和280 h,外观形貌由粗糙、暗淡、不均匀、有局部缺陷变为较平整、光亮、均匀和致密,并使镀层的非晶相程度得到改善,提高了产品的耐蚀性能。The study on the improvement of the process and performances of electroless plating Ni - Zn - P coatings by adding lanthanum rare earth compounds into the basic plating solution was carried out. The single factor test method was first applied to investigate the effects of compositions and technical conditions of basic plating solution on the targets of deposition rate and corrosion resistance time. The optimal concentrations were determined to be ： hexahydrate nickel sulfate 27 g · L- 1 , sodium hypophosphite 16 g·L-j, sodium citrate dihydrate 90 g· L-1 , zinc sulfate heptahydrate 8 g·L-1 , ammonium chlo- ride 46 g· L-1 ,cadmium sulfate 2 × 10-3 g. L-1 and the optimal operation conditions were pH 9.0 and temperature 90℃. Then, the effects of concentrations of lanthanum oxide, ceric sulfate and ytterbium oxide added in the basic plating solution on the deposition rate, exterior morphology, corrosion resistance ability and crystal phase structure of the Ni - Zn - P alloy were investigated. The results show that the deposition rates and performances are firstly improved and then weakened with the in- crease of the concentrations of the three kind of rare earths eomponds. The optimal concentrations of lanthanum oxide, ceric sulfate and ytterbium oxide are determined to be 10 ×10-3g·L-1 , 15 ×10-3g·L-1 and 15×10-3g·L-1 respectively, under which, compared with the basic plating solution, the deposition rate is increased from 3.7×10^-3g·cm-2·h-1 to 4. 3×10^-3g·cm-2·h-1 4.4×10^-3g·cm-2·h-1 and 4.5×10^-3g·cm-2·h-1 respectively; the corrosion resistance time is extended from 240 h to 300 h, 275 h and 280 h respectively; the coatings with roughness, grey dark, uneven surface and defectives become to be those with smoothness, brightness, uniform and dense. In addition, the amorphous phases of the coatings are strengthened, leading to the improvements of corrosion resistance ability of the products.

关 键 词：化学镀 稀土 镍-锌-磷 氧化镧 硫酸铈 氧化镱 

分 类 号：TQ153.3[化学工程—电化学工业] TQ028.8