Study on detinning process of a reflow conductor roll

Adhering tin is the main reason of a reflow conductor roll which works in an electroplating tin line （ETL）. A det- inning agent whose main composition is NaOH and KOH and assistant composition is Na2PbO2 or K2PbO2 and NaNO3 or NaNO2 has excellent detinning effects when the temperature of detinning solution is 40-80℃ and the temperature of the reflow conductor roll reaches 40-70℃. After the adhering tin layer of the reflow conductor roll is removed, the roughness of the reflow conductor roll can resume to 4.0 μm, its service life increases by 80%, and the repairing cost decreases by 90%.

Failure Mechanism of Reflow Conductor Roll of Electroplating Tinning Line

The surface roughness of reflow conductor roll was checked on membrane sample. The surface morphology of conductor roll was observed by microscope, and the composition of adhered layer on conductor roll surface was analyzed by X-ray spectroscope. The results show that tin adhesion is the main reason for failure of conductor roll, and the failure of conductor roll is accelerated by wear. The measures to decrease tin adhesion and improve wear resistance were put forward.

电镀锡机组软熔导电辊脱锡技术研究

粘锡是电镀锡机组软熔导电辊失效的主要原因,应用化学方法脱锡是延长导电辊寿命的重要途径。开发了氢氯化钠(钾)为主要组成,并加入适量亚铅酸钠(钾)和硝酸(亚硝酸)钠配制而成脱锡剂,当脱锡剂温度为40- 80℃,导电辊表面温度为40-70℃时,对粘锡导电辊具有很好的脱锡效果。粘锡导电辊脱锡后的表面粗糙度可以恢复到4．0μm以上,导电辊使用寿命提高80％,降低导电辊修复成本90％,并大幅度减少导电辊更换时间,提高电镀锡机组生产作业率。

酸性脱锡剂在电镀锡机组软熔导电辊脱锡效果的研究

综述了脱锡剂的研究进展。研究了不同酸性脱锡剂对导电辊脱锡效果。结果表明,脱锡剂高锰酸钾脱锡效果较好,脱锡速度快,脱锡速度达0.023g/cm2,且添加剂亚硝酸钠有助于脱锡效果。粘锡的模拟导电辊脱锡过程表明,脱锡时间为5 min时,模拟导电辊表面平均粗糙度值达1.074μm,脱锡的效率达到97.3%。高锰酸钾-亚硝酸钠体系的脱锡剂对导电辊材质腐蚀性较小。