电镀锡机组软熔导电辊粗糙度异常的分析及控制

Analysis and control of abnormal roughness of reflow conductive roller in electrolytic tinning line

某电镀锡机组2#软熔导电辊(位于淬水槽之后)在使用过程中粗糙度异常下降,寿命较短,在一定程度上制约了机组的正常生产。采用扫描电镜和能谱对因此而产生的镀锌板缺陷进行了微观形貌及元素成分的分析,比较了1#(位于淬水槽前)、2#导电辊的粗糙度变化,以及下机后2#导电辊在清洗前后的粗糙度。认为粘锡是造成粗糙度下降的根本原因,磨损所造成的粗糙度下降可以忽略不计。提出了控制2#软熔导电辊粗糙度下降的措施,如提高2#软熔导电辊的压辊压力,降低淬水槽中Sn2+的浓度,降低淬水槽温度,防止带钢边部产生锡须等。

The No.2 reflow conductive roller located after quench tank in an electrolytic tinning line （ETL） has a short service life due to the abnormal decrease of its surface roughness, which restricts the normal production to a certain extent. The microscopic morphology and elemental composition of the defect resulted from the roughness decrease on tinned sheet were analyzed by scanning electron microscopy and energy-dispersive spectroscopy. The roughness variation of No.1 （located before quench tank） and No.2 conductive rollers and that of the used No.2 conductive roller before and after cleaning were compared. It is considered that tin sticking is the main reason leading to the abnormal roughness decrease, and the effect of abrasion is negligible. Some measures for controlling the roughness decrease of No.2 reflow conductive roller were presented, such as increasing its rolling pressure, decreasing the Sn2＋ content and solution temperature in quench tank, and preventing the formation of tin whiskers at the edges of steel strips.