In the process of using potassium chloride zinc plating additive, sometimes the workpiece at both ends of the hanger is prone to scorch. What is the reason?
According to the site experience and the characteristics of the product potassium chloride zinc plating additive BZ-528, Bigolly Technology has analyzed the reasons why the workpiece at both ends of the hanger is easy to burn:
1. The content of zinc chloride or potassium chloride in the plating solution is too low.When the zinc chloride content in the plating solution is low, the dispersion ability and deep plating ability of the plating solution will be better, but the allowable upper limit of current density will be reduced, so that the workpiece is prone to scorch.When the content of potassium chloride in the bath is low, the dispersion ability and deep plating ability of the bath will decrease, and the range of bright current density will also narrow, so that the workpiece is prone to scorch.Therefore, we should strictly control the content of zinc chloride and potassium chloride in the process.
2. The pH value of the plating solution is too high.When the pH value of potassium chloride zinc plating solution is too high, the zinc coating of the workpiece is prone to blackening, roughness, looseness, burning and other phenomena.Therefore, the pH value of the plating solution should be controlled within the range of 4.6-5.4 during production.
3. The brightener content is insufficient.Proper brightener can improve the brightness and filling ability of the coating, and expand the range of bright current density, so as to obtain a bright zinc coating.When the content of brightener is insufficient, the brightness and filling ability of the coating are insufficient, and the coating is prone to be rough and burnt.
4. There are many copper and iron impurities in the plating solution.When there are many copper and iron impurities in the plating solution, the zinc coating of the workpiece is prone to fogging, roughness, burning and other phenomena.Copper impurities in the plating solution can be removed by small current electrolysis or zinc powder treatment and filtration;Iron impurities can be treated with hydrogen peroxide regularly to oxidize divalent iron into trivalent iron to form ferric hydroxide precipitation and then filtered out.
Therefore, when we use potassium chloride zinc plating additive to produce, if the key at both ends of the hanger is prone to scorch, we can eliminate the above four points to solve the problem in time and reduce the loss caused by the fault.If you are interested in potassium chloride zinc plating additives, please contact Bigolly customer service for free samples and detailed technical information!
If you want to know more about zinc plating, you can check "Electroplating encyclopedia".