Generally, when we use potassium chloride acid zinc additive for production, the temperature of the plating solution should be controlled at 15-30 ℃, so that a zinc coating with excellent performance can be obtained.So what is the effect of high temperature on the plating solution?
Bigolly Technology made an analysis based on the field experience and the characteristics of the product's potassium chloride acid zinc additive BZ-528,The working conditions of the acid galvanizing process are mainly determined by the brightener (cloud point temperature).The temperature of the plating solution increases, which accelerates the reaction speed and ion diffusion speed of the cathode, reduces the polarization of the cathode, and makes the crystallization of the coating thicker.
When the temperature of the plating solution is too high, exceeding 35°C, the brightener will decompose and the plating solution will become cloudy.At this time, the brightness of the galvanized layer will deteriorate, especially in the low current density area; the deep plating ability and dispersion ability of the coating will also decrease.
In the daily production process, as the temperature of the plating solution changes, the current density should also be adjusted accordingly.When the bath temperature is low, the current density should be adjusted to the middle and lower limit of the process range, and the deposition rate becomes slower at this time;When the bath temperature is high, the current density should be adjusted to the upper middle limit of the process range. At this time, the deposition rate of the coating is fast and the production efficiency is high.
In addition, if the temperature is high, the conductivity of the plating solution will be improved, which will promote the dissolution of the anode, improve the anode current efficiency, reduce pinholes, and reduce the internal stress of the coating.
Therefore, in the production process of using potassium chloride zinc zinc additive, the temperature has a great influence on the plating solution, and it needs to be strictly controlled within the process range.