镀铬板表面孔隙率的研究  

STUDY ON SURFACE POROSITY OF CHROMIUM PLATEING STEEL PRODUCT

作　　者：唐超[1] 徐冬梅[2] 张裕海[2] 郭明明[2] 李建中[2] 

机构地区：[1]宝山钢铁股份有限公司冷轧薄板厂,上海200431 [2]东北大学材料与冶金学院,沈阳110819

出　　处：《上海金属》2015年第5期15-19,24,共6页Shanghai Metals

摘　　要：采用扫描电镜、电化学分析和化学浸蚀方法,研究了镀铬板表面孔隙的形成及影响因素。结果表明,镀铬板表面形貌对孔隙的形成有着重要的影响。在镀层厚度相同的条件下,镀铬板表面孔隙主要产生于"凸起"的轧制纹处,而"凹陷"的轧制纹处不易产生孔隙。随着金属铬层厚度的增加,镀铬板表面孔隙减少,且呈粗大型。随着氧化铬层厚度的增加,镀铬板表面孔隙反而增多。结合电化学分析,金属铬层对改善镀铬板的耐蚀性要好于氧化铬层。低电流密度获取的镀铬板表面孔隙较多,而高电流密度获取的镀铬板表面孔隙明显较小。Effect of the surface properties of chromium plating steel product on finishing was studied by means of scanning electron microscopy （SEM）, electrochemistry and chemical etching methods. The results showed that surface morphology of chromium plating steel has an important influence on the formation of porosity. Under the same conditions the coating thickness, the surface porosity of chromium plating steel was mainly produced in the ＂bulge＂ of the rolling pattern, and was not easy to produce on a rolling pattern with the ＂sag＂. With the increase of chromium metal layer thickness, surface porosity of chromium plating steel was reduced, and showed large crude. With increasing layer thickness of chromium oxide, its surface porosity increased. Combined with electrochemical analysis, chromium metal layer was better in improving the corrosion resistance of chromium plating than chromium oxide layer. The coating of chromium plating steel obtained by low current density presented high surface porosity, but the coating obtained by a high current density showed a low porosity.

关 键 词：镀铬板 表面形貌 孔隙 耐蚀性 

分 类 号：TQ153.11[化学工程—电化学工业]