In the production process of using zinc nickel alloy color passivator, sometimes the passivation film of the workpiece will have uneven colors of black, yellow and blue. What causes this?
According to the field experience and the characteristics of the product zinc nickel alloy color passivator Zn-324, Bigolly Technology has made analysis, mainly including the following four points:
1. The temperature of zinc nickel alloy plating solution is high.When the bath temperature is above 30 ℃, the nickel ion deposition rate will be faster, so the nickel content in the alloy coating is higher.Generally, nickel content in alloy coating is more than 16%, which will cause uneven passivation color, and the passivation film will appear black or yellow blue.At this time, stop adding nickel salt supplement and adjust the nickel ion concentration in the plating solution.
2. The current density of zinc nickel alloy electroplating is high.High current density and rapid deposition of nickel ions will lead to high nickel ion content in the alloy coating and uneven passivation color.
3. The temperature and pH value of the passivation solution fluctuate greatly.During the production process, large fluctuations in the temperature or pH value of the plating solution will affect the co deposition rate of nickel, thus changing the passivation performance of the alloy coating.The temperature of the bath solution shall not exceed 30 ℃, and the pH value shall be controlled within the range of 1.8~2.2.
4. The passivation solution is uneven.The color of the passivation film is uneven due to uneven stirring or uneven aeration of the passivation solution.In the production process, the concentration of the passivation solution should be well controlled, so as not to affect the uniformity of the color of the passivation film of the workpiece.
Therefore, in the production of zinc nickel alloy color passivator, when the color of the passivation film of the workpiece is uneven, we can check the causes of the failure from the above four points and try to solve them to reduce the loss caused by the failure.If you are interested in zinc nickel alloy color passivator, please contact Bigolly customer service for free samples and detailed technical information!
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