文献类型：期刊文献

中文题名：稀土化合物对碳钢表面化学镀镍层无铬钼酸盐钝化的影响

英文题名：Effect of rare earth compounds on chromium-free molybdate passivation for electroless nickel coating on carbon steel

作者：杨春

第一作者：杨春

机构：[1]贵州理工学院化学工程学院

第一机构：贵州理工学院化学工程学院

年份：2017

卷号：36

期号：19

起止页码：1029-1032

中文期刊名：电镀与涂饰

外文期刊名：Electroplating & Finishing

收录：CSTPCD;;北大核心:【北大核心2014】；CSCD:【CSCD_E2017_2018】；

语种：中文

中文关键词：碳钢;化学镀镍;无铬钝化;钼酸盐;氧化钇;硝酸铈;耐蚀性

外文关键词：carbon steel; electroless nickel plating; chromium-free passivation; molybdate; yttrium oxide; cerous nitratecorrosion resistance

摘要：先对比了铬酸盐体系与钼酸盐体系对化学镀镍层的钝化效果,然后研究了氧化钇和硝酸铈对钼酸盐钝化的影响,并通过正交试验得到最优钝化液配方为:钼酸铵16 g/L,硝酸铈8 mg/L,氧化钇8 mg/L,氟硅酸铵0.5 g/L,1+1磷酸适量(使pH为2.00±0.02)。采用最优钝化液在(70±2)°C的温度下对Ni–P合金镀层钝化8 min时,钝化膜表面平整,呈深灰色,耐硝酸变色时间可达458 s,与传统铬酸盐钝化膜的耐硝酸变色时间(461 s)相当。
The effectiveness of passivation respectively using a chromate system and a molybdate system was compared. The effects of rare earth compounds i.e. yttrium oxide and cerium nitrate on molybdate passivation were studied. The optimal composition of molybdate passivation bath was obtained by orthogonal test as follows： ammonium molybdate 16 g/L, cerous nitrate 8 mg/L, yttrium oxide 8 mg/L, ammonium fluorosilicate 0.5 g/L, and 50vol% phosphoric acid as required （adjusting pH to 2.00 ±0.02）. The passivation film obtained on Ni-P alloy coating from the optimal bath at （70 ± 2） ℃ for 8 rain is smooth and dark gray, and can endure up to 458 s in nitric acid without discoloration, which is comparable to that of the traditional chromate passivation film （461 s）.