(1. 哈尔滨工业大学 应用化学系， 哈尔滨 150001；
2. 宝山钢铁集团公司 冷轧部， 上海 201900)
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。
关键字: 电镀锡； 黑灰； 阴极电解钝化
（1. Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001， P.R.China；
2. Cold Rolling Mill Plant， Bao Shan Iron and Steel Corp., Shanghai 201900， P.R.China）
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.
Key words: tinplating; smudge; electrolytic passivatio
