钝化液的老化及其对镀锡板钝化膜性能的影响  

Aging of passivating solution and its effect on performances of passivation film on tinplate surface

作　　者：王洺浩[1] 王志登[1] 陆永亮[2] 王熙禹 王紫玉[1] 李宁[1] 

机构地区：[1]哈尔滨工业大学化工学院,黑龙江哈尔滨150001 [2]上海梅山钢铁股份有限公司技术中心,江苏南京210039

出　　处：《电镀与涂饰》2016年第4期184-188,共5页Electroplating & Finishing

摘　　要：为研究钝化液老化对镀锡板钝化膜性能的影响,首先研究了老化过程中钝化液的变化,再通过单因素试验考察了钝化液的变化对钝化膜性能的影响。在此基础上结合生产实际,研究了钝化液老化对钝化膜铬含量、耐蚀性与黑灰程度的影响。结果表明,钝化液的老化过程伴随着Cr、Fe不溶物的生成以及pH和槽压的升高,这些变化都会影响钝化膜的生成及其性能。生产现场都会对钝化液pH进行实时监控,因此由钝化液老化引起的钝化膜铬含量和耐蚀性的下降以及黑灰量的增加,主要与不溶物在阴极表面的吸附有关。生产中通电量达到37.5 A·h/L时,需通过加强钝化液的过滤与加快溶液的更新速率来降低其老化程度。In order to study the effect of aging of passivating solution on the performances of passivation film on tinplate surface, the change of passivating solution during aging process was examined, and the effects of parameter variation of passivating solution on the performances ofpassivation film were studied by single factor experiment. On the basis of the above investigations, the effect of solution aging on chromium content, corrosion resistance and smudge degree of passivation film was researched. It is indicated that the process of aging is accompanied with the generation of insoluble compounds containing Cr and Fe as well as the increase ofpH and tank voltage, which influence the formation and properties of passivation film. Since the pH ofpassivating solution is monitored and controlled at real time in practical production, the decrease of chromium content and corrosion resistance and the increase of smudge amount of passivation film caused by solution aging are mainly correlated with the adsorption of insoluble compounds on cathode surface. The aging level of passivating solution should be reduced through enhancing solution filtration and accelerating the solution renewal when the charge load is up to 37.5 A.h/L in practical production.

关 键 词：镀锡板 铬酸盐钝化 老化 黑灰 铬含量 耐蚀性 

分 类 号：TG178[金属学及工艺—金属表面处理] TQ153.13[金属学及工艺—金属学]