预烘烤对镀锡板表面膜层和润湿性的影响  

Effect of Preheating Treatment on the Surface Film and Wettability of the Tinplate

作　　者：王志登 王洺浩[3] 李宁[3] WANG Zhi-deng;WANG Ming-hao;LI Ning(Shanghai Meishan Steel Company,Nanjing 210039,China;Harbin Engineering University,Harbin 150001,China;Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]上海梅山钢铁公司,南京210039 [2]哈尔滨工程大学,哈尔滨150001 [3]哈尔滨工业大学,哈尔滨150001

出　　处：《表面技术》2020年第12期156-161,共6页Surface Technology

摘　　要：目的提高镀锡板与涂料匹配性,研究预烘烤消除缩孔对镀锡板表面膜层和润湿性能的影响。方法采用计时电位曲线、X光电子能谱仪、热重差热测试及表面接触角方法,分别评价烘烤处理前后的镀锡板表面钝化膜、氧化膜成分含量变化,并通过表面能对表面润湿性变化进行分析。结果120℃烘烤不同时间下,钝化膜铬含量由4.30μg/cm2增至5.16μg/cm2,膜层中的Cr(OH)3/Cr2O3含量比例显著下降,使Cr(OH)3脱水缩合生成电活性的Cr2O3被检出。氧化膜含量(库伦法计算)由1.5m C/cm2以上降至0.6m C/cm2左右,其组成进一步被氧化生成SnO2,无法被阴极还原,降低了可被检出的氧化膜含量。水接触角由86°快速降至65°左右稳定,表面能值由37.5 mN/m最高增至50 mN/m,说明烘烤处理大幅提高了材料表面被水极性介质的润湿作用。结论通过镀锡板涂膜前预烘烤处理,改变了镀锡板表面钝化膜和氧化膜组成以及含量比例,降低了水接触角,提高了表面能值,增强了材料对涂料表面张力适配范围,有利于漆膜稳定铺展,为涂料端配方优化,实现镀锡板缩孔控制提供了技术方向。The work aims to improve the adaptability performance between tinplate and lacquers and study the effect of preheating treatment for eliminating eye holes on the surface film and wettability of tinplate.Chronopotentiometric method,X-ray photoelectron spectroscopy,thermogravimetric differential thermal test and surface contact angle analysis were used to evaluate the changes in the passivation film and oxidation film on tinplate surface before and after preheating treatment and the wettability performance was analyzed by surface energy.After preheating treatment at 120℃for different time,the chromium content in the passivation film increased from 4.30μg/cm2 to 5.16μg/cm2,and the ratio of Cr(OH)3/Cr2O3 decreased significantly,leading to that the electroactive Cr2O3 produced by dehydration and condensation of Cr(OH)3 was detected.The oxide film content was reduced from above 1.5 mC/cm2 to about 0.6 mC/cm2,with composition further oxidized to SnO2,which could not be reduced by cathode,thus reducing the content of oxidation film that could be detected.Meanwhile,the water contact angle quickly decreased from 86°to about 65°,and the surface energy value increased from 37.5 mN/m to 50 mN/m,which indicated that the surface wettability was greatly improved for water and other polar mediums by preheating treatment.The preheating treatment before tinplate coating changes the composition and content ratio of passivation film and oxidation film on tinplate surface,reduces the water contact angle,improves the surface energy and enhances adaptation range for lacquers,which is conductive to the stable spread of lacquers and provides a technical direction for controlling eye holes on tinplate.

关 键 词：预烘烤 镀锡板 表面膜层 钝化膜 润湿性 接触角 

分 类 号：TQ153[化学工程—电化学工业]