镀液温度失调、密度不当对镀层有什么影响?如何控制?
天物彩板专注彩涂卷行业17年——镀液温度失调、密度不当对镀层有什么影响_青海彩钢板多少钱请拨打网站上方电话咨询
1、 镀液温度不平衡对涂层的影响及控制：提高温度有利于锡和铁的析出，但会使涂层粗糙、有灰色光泽；低温有利于锌的沉淀，但会使涂层灰白，亮度差。溶液温度应控制在20~35°C范围内。
2、 电流密度不当对涂层的影响：
随着电流的增加，镀层中的锌含量增加，在电流密度较高的区域会产生颗粒状的白色沉淀；
当电流减小时，镀层中的镍含量增加，在电流密度过低的区域会产生亮度较差的灰黑色镀层。
3、 电镀溶液应使用活性炭进行处理：
光亮Zn-Fe-Ni合金采用茉莉醛作为发光剂。由于茉莉醛在电镀过程中易氧化成羧酸类化合物并存在于镀液中，因此镀层的亮度随羧酸含量的增加而降低。用活性炭处理可以减少或消除这种影响。
处理方法：① 一般1.5~2个月用活性炭处理一次（按二班生产），活性炭用量3~5g/L，连续搅拌2h；
② 然后静置12小时以上，使活性炭有充分吸附的机会，然后过滤并加入新制备的茉莉花型和适量的酒石酸钾钠进行电镀。
1、 The influence and control of bath temperature imbalance on the coating: increasing the temperature is conducive to the precipitation of tin and iron, but makes the coating rough and gray luster; Low temperature is conducive to the precipitation of
zinc, but makes the coating gray white and poor brightness. The solution temperature shall be controlled within the range of 20 ~ 35 °℃.
2、 Effect of improper current density on coating:
With the increase of current, the amount of zinc in the coating increases, and granular white precipitates are produced in the area with high current density;
When the current decreases, the
nickel content in the coating increases, and the gray black coating with poor brightness is produced in the area where the current density is too low.
3、 The plating solution shall be treated with activated carbon:
Bright Zn Fe Ni alloy uses
jasmonal as luminescent agent. Because jasmonal is easy to oxidize into carboxylate compounds and exist in the solution in the electroplating process, the brightness of the coating decreases with the increase of carboxylate content. Treatment with activated
carbon can reduce or eliminate this effect.
Treatment method: ① generally, it is treated with activated carbon once in 1.5 ~ 2 months (according to the second shift production), the amount of activated carbon is 3 ~ 5g / L, and it is kept for 2h
under continuous stirring;
② Then stand for more than 12h, so that the activated carbon has the opportunity of full adsorption, and then filter and add the newly prepared Jasmine type and an appropriate amount of potassium and sodium tartrate for electroplating.
