What are the causes of back ionization?

It mainly caused when the gun and product doesn’t have much space and particles emplacement leads to back ionization. Often, this issue happens in corona spraying guns, because the charging part is placed at tip of the gun, when the powder passes through the tip (on close coating that is less than one feet) the ions are negatively charged and grounded, some particles will jump over and form back ionization. In Tribo charging gun back ionization will not happen, because the powder particles got charged inside the gun (as internal parts of the gun are made up of Teflon). But

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Is it possible to remove powder coating?

Yes. It can be removed using highly concentrated Sulphuric acid (98%), but you have to be very cautious when using Sulphuric acid and it is one of the cheapest ways of removal. Other options such as using Methylene Chloride, Acetone are also effective in removal of powder coated parts. Burning or heating of the substrate to certain extent is also another option for removal, but take care of warping.