摘要
建立了分光光度法测定镍基纳米复合镀层中纳米粉体Al2O3共析量的方法。在乙酸-乙酸钠缓冲溶液介质中,Al^3＋与铬天青S反应生成稳定络合物,体系的最大吸收波长为560nm,铝质量浓度在0～10.0μg/mL范围内遵守比尔定律,表观摩尔吸光系数为1.24×10^4L·mol^-1·cm^-1。研究了镀层的处理方法和共存离子的影响,结果表明,将镀件放在硝酸中3d可以将镀层从基板上完全解脱下来,同时溶解下来的铜和铁大部分经离心分离除去,余下部分用抗坏血酸掩蔽。方法已用于镍基纳米复合镀层中氧化铝共析量的测定,相对标准偏差为1.4%～3.5%,回收率在98.3%～102.0%之间。
A spectrophotometric method for the determination of total precipitated quantities of nanosized Al2O3 in Ni- based nano-composite coatings is developed. In HAc-NaAc medium, Al^3＋ reacts with chrome azurol S to form a stable complex, Whose the maximum absorption is at 560 nm. Beer＇s Law is obeyed when aluminium content is in the range of 0-10.0 μg/mL . The apparent molar absorptivity is 1.24×10^4 L·mol^-1·cm^-1. Coatings treatment method and co-existing ions was studied. Results showed that when a coating piece was immersed in nitric acid for three days, the coating species should be extricated from coating piece completely. The extricated Cu, Fe was mostly eliminated by centrifugal machine and the rest was masked by ascorbic acid. The method is used to determine total precipitated quantities of Al2O3 in Ni- based nano- composite coatings with RSDs of 1. 4% - 3.5% and recoveries of 98.3%-102.0%.
出处
《冶金分析》
EI
CAS
CSCD
北大核心
2008年第2期37-39,共3页
Metallurgical Analysis
基金
新乡市科技发展项目(No.06G107)
关键词
纳米氧化铝
分光光度法
复合镀层
铬天青S
nano-sized aluminium oxide
spectrophotometry
composite coating
chrome azurol S
