What should be done if the cloud point is low when using potassium chloride zinc plating brightener?
One major drawback of the traditional potassium chloride galvanizing solution is the cloud point issue, which is a unique characteristic of nonionic surfactants. The reason for this is that when the temperature rises, the solubility of the nonionic surfactant, which serves as the carrier brightener, decreases to a certain extent and precipitates in the galvanizing solution, causing the solution to become turbid. After the plating solution has been standing for a period of time, there will be obvious oily substances floating on the liquid surface.
So, how can the cloud point be improved? Generally speaking, this issue can be addressed by adding anionic surfactants that have no cloud point under high-temperature carriers to the brightener. Since anionic surfactants do not have salting out in the plating solution and do not precipitate at high temperatures, they can also play a solubilizing role for nonionic carrier brighteners and increase the cloud point.
Anionic surfactants are in an ionized state in the plating solution. A high pH value of the plating solution is conducive to the ionization of anionic surfactants and can significantly reduce the cloud point.
When the pH value decreases, the ionization degree of anionic surfactants decreases. The unionized anionic surfactants are in a nonionic state and possess the properties of nonsurfactants. Their solubilizing effect declines, so the increase in cloud point is not significant.
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