锌白铜带材表面高温发黄问题的研究

Study on the Problem of High Temperature Yellowing on the Surface ofZinc-white Copper Strip

锌白铜具有优良的电磁屏蔽性能,被广泛应用于电磁屏蔽罩,但在实际使用过程中,需要通过高温钎焊实现与其他部件的连接,在钎焊过程中往往会出现高温发黄现象,影响产品的美观及使用特性。通过研究锌白铜高温发黄机理和清洗工艺、研磨工艺、工作辊表面粗糙度以及成品退火工艺对高温发黄的影响,解决了锌白铜高温发黄问题。结果表明,采用合适的清洗介质浓度和研磨刷转速、较低的工作辊表面粗糙度及合适的成品退火工艺,可以保证锌白铜在300℃保温5 min后不发黄;将该技术推广应用于铜镍锡、铜镍硅和铜锡磷等需要高温钎焊的合金中,同样也可解决高温钎焊发黄问题。

Zinc-white copper has excellent electromagnetic shielding performance,which widely used in electromagnetic shielding cover.But in the actual use process,it is necessary to realize the connection with other components through high temperature brazing,and high temperature yellowing often occurs in the brazing process,which affects the beauty and use characteristics of the product.By studying the mechanism of high temperature yellowing of zinc-white copper and the effects of cleaning process,grinding process,work roll surface roughness and finished annealing process on high temperature yellowing,the problem of zinc-white copper yellowing at high temperature is solved.The results show that using the appropriate cleaning medium concentration and grinding brush speed,low work roller surface roughness and appropriate annealing process for the finished product,it can ensure that zinc-white copper without yellowing at 300℃for 5 minutes.By promoting the application of this technology to copper-nickel-tin,copper-nickel-silicon and copper-tin-phosphorus alloys that require high-temperature brazing,the yellowing problem during high temperature brazing has also been solved.