不溶性阳极电铸中镍离子浓度变化及其对电铸镍的影响

Variation of Nickel Ions Concentration during Electroforming Using Insoluble Anode and the Influence on Nickel Electroforming

研究了不溶性阳极电铸中镍离子浓度变化及其对电铸镍的影响。利用EDTA配位滴定法、扫描电子显微镜、法拉第定律和硬度计等手段,对溶液中镍离子的浓度及电铸镍层的性能进行了检测。结果表明:采用不溶性阳极电铸镍,在4A/dm2、8A/dm2、12A/dm2的电流密度下电铸12h后,镍离子的浓度分别降低了19.0%、33.6%、54.2%,电流效率分别降至59.7%、51.0%、35.9%;在8A/dm2和12A/dm2的电流密度下,电铸镍层的晶粒得到细化,硬度增大。

Variation of nickel ions concentration during electroforming using insoluble anode and the influence on nickel electroforrning was investigated. The concentration of nickel ions in electroforrning solution and the properties of electroforrned nickel coatings were tested by EDTA complexometric titration, scanning electron microscope, Faraday＇s law and hardness tester. Results showed that, electroforrning of nickel using insoluble anode at the current density of 4 A/dm2, 8 A/dm2 and 12 A/dm2 for 12 h, the concentration of nickel ions was decreased by 19.0%, 33.6% and 54.2% respectively, and the current efficiency decreased to 59.7%, 51.0% and 35.9% respectively. When current density was 8 A/dm2 and 12 A/dm2, the grains of the electroformed nickel coatings were refined, and the hardness was increased.