Potassium chloride galvanizing process production plating tanks appear floating oil phenomenon, the specific gravity of the solution is relatively high, scooped out the solution into a beaker to stand overnight, the surface has a layer of oil, the solution is clarified and a small amount of precipitation at the bottom.
This is a common oil slick phenomenon, but trying to solve it is not easy, which reflects in two aspects, one is the elimination of the cause, and the other is the difficulty of treatment. Therefore, it is very necessary to talk about the causes of this problem and and how to solve them?
There are six reasons in general, and we'll talk about the first one in this article.
We know that potassium chloride galvanizing process has strong dependence on brightener, so most of the floating oil in potassium chloride galvanizing solution is related to brightener.Because the brightener is affected by electrochemical reaction and other factors in long-term use, which will decompose and produce some organic substances, especially when the brightener content in the plating solution is too high, will be due to "oil precipitation" and make the plating solution appear floating oil even turbidity, as a result, the organic impurities and zinc co-deposition in the plating solution will affect the quality of plating layer.
We not only need to be careful with brighteners, but also need to be careful with how we add them. This is due to the phenomenon of "oil precipitation" of the brightener, which occurs in certain parts of the potassium chloride concentration, causing these parts of the plating solution to be supersaturated with potassium chloride and picking out the organic matter.
For this reason,when galvanizing plants replenish potassium chloride galvanizing brightener,our technical engineers always advise that they must first dilute the brightener with water (or plating solution) at a ratio of 3~4:1, and then allow the brightener to be dispersed quickly and evenly in the plating solution in small quantities by stirring.
Here to say one more thing, galvanizing plant in the replenishment must strictly abide by the principle of adding less and adding diligently, if not, it will cause the plating solution turbidity.
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