Study on the Problem of High Temperature Yellowing on the Surface of Zinc-white Copper Strip
Zinc-white copper has excellent electromagnetic shielding performance,which widely used in e-lectromagnetic 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 bra-zing 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 annea-ling 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 tem-perature brazing has also been solved.
zinc-white copperhigh temperature yellowingroughnessfinished annealing
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