化学镀镍低铬钝化添加剂的优化  

Optimization of additives for low-chromium passivation of electroless nickel plating

作　　者：曾庆雨[1] 刘定富[1] 毕晨[1] 杨明悦[1] 

机构地区：[1]贵州大学化学与化工学院,贵州贵阳550025

出　　处：《贵州科学》2016年第4期52-57,共6页Guizhou Science

基　　金：2013贵州省科技计划(黔科合GY字[2013]3035号)

摘　　要：在pH 2.0±0.1、温度70±2°C和时间10 min的条件下,采用5 g/L K2Cr O3+0.5 g/L(NH4)2Si F6低铬钝化液对化学镀Ni-P层进行钝化。以钝化试样的耐硝酸变色时间为指标,通过单因素试验和正交试验对钝化液有机类添加剂进行筛选和优化,得到的有机添加剂的最优组合为植酸12 ml+一乙醇胺35 ml+丙烯酸树脂12 ml。同时借鉴于实验室前期对无机钝化剂的研究成果,将无机与有机添加剂进行正交复配,得到钝化添加剂的最优组合是:16 g/L钼酸铵+4 mg/L氧化钇+18ml植酸+35 ml一乙醇胺。采用最佳添加剂后,钝化膜试样的耐硝酸变色时间和中性盐雾腐蚀时间各为465 s和48 h,膜层表面平整、致密,综合性能改善。Under the conditions of pH 2.0±0. 1,70± 2℃ and 10 min, the electroless plated Ni-P layer was passivatedwith the low chromium passivation solution of 5g/L K2Cr03＋ 0.5g/L（ NH4 ）2SiF6. With the nitric-acid-resistant discol-oration time of passivation samples as the index, the passivation solution additives were screened and optimized by singlefactor test and orthogonal test. The optimal combination of additives obtained was 12 ml phytic acid ＋ 35 ml monoethano-amine＋12 ml acrylic resin. Drawing on previous study on inorganic passivating agents in the laboratory, the inorganic andorganic additives were compounded orthogonally to obtain the optimal combination of passivation additives： 16 g/L ammo-nium molybdate＋4 mg/L yttrium oxide＋ 18 ml phytic acid＋35 ml monoethanoamine. With the best combination of addi-tives, the nitric-acid-resistant discoloration time and the neutral salt spray erosion time of the passivation film sample were465 s and 48 h respectively, and the film surface was smooth and dense with improved comprehensive performance.

关 键 词：低铬 钝化 化学镀镍 有机—无机复合添加剂 耐蚀性 

分 类 号：TQ153.12[化学工程—电化学工业]