电解钝化对镀锡钢板黑灰程度的影响

来源期刊：中国有色金属学报2000年第4期

论文作者：李宁 李平 黎德育 贡雪南

文章页码：587 - 590

关键词：电镀锡； 黑灰； 阴极电解钝化

Key words：tinplating; smudge; electrolytic passivatio

摘    要：弥散在镀锡材料表面的颗粒状黑色物质—黑灰，主要产生于软熔阶段和阴极电解钝化阶段。 采用扫描电镜与能谱分析， 测试了黑灰的形貌及黑灰的主要成分。 研究了阴极电解钝化处理时， 钝化液浓度、 pH值、 温度、 老化程度、 阴极钝化电量以及杂质离子对黑灰程度的影响。 在电解钝化工艺条件为钝化液浓度 ρ (Na₂Cr₂O₇·2H₂O)=25 g/L， pH=4.5， θ =38～45 ℃及钝化电量 σ =1.62～4.86 C/dm²时， 产生黑灰最少。

Abstract: The smudges on tinplating steel sheet are mainly formed during flowing and electrolytic passivation treatment. The appearanceand component of smudges were analyzed by means of SEM and EDS. The factors of electrolytic passivation, including the concentration of passivation solution, pHvalue, temperature, aging time, electric charge of passivation and impurity were studied. It is shown that smudges are least produced at technique parameters ρ(Na₂Cr₂O₇·2H₂O)=25g/L, pH=4.5,θ =38～45 ℃, electric charge of passivation σ =1.62～4.86 C/dm².