What PPM concentration of zinc ions should be maintained in the water during circulating water pre-coating?
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What PPM concentration of zinc ions should be maintained in the water during circulating water pre-coating?
The concentration of Zn2+ ions: Zn2+ ions and Ca2+ ions have essentially the same effect. The remaining polyphosphate compounds are capable of rapidly forming a dense protective film, possess strong durability, and play a crucial role in protecting metals from corrosion. Like Ca2+ ions, Zn2+ ions are also important components that play a role in film formation. However, Zn2+ ions enable faster film formation; the resulting protective film is more durable, and it can also provide cathodic protection. Based on the above, the concentration of zinc ions added to water should be maintained at 20–30 mg/L, as this yields a better film-forming effect on the metal strips.
Is it the owner’s practical experience or a theoretical calculation that the concentration of zinc ions added to water should be maintained at 20–30 mg/L?
I hope the theoretical calculations are useful to you:P
In actual operation, 20PPM is already high enough; moreover, a high concentration of zinc ions can lead to precipitation, increased turbidity, and an elevation in pH
This post was last edited by rrstar on 2015-6-15 11:17. I agree with the view from the third floor – even 20 is already too high.