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Why CRS is likely more chargeable versus tin plate ?

I am in to powder coating .We have experimenting a PE plastic coating which can be sprayed by a electrostatic gun. We are using two kind of panels.one is CRS and the other is Tin plate. We have notice if we use the CRS, the PE is sprayed easily while in the tin plate it seems to repelling the powder.I would like to now if their is something to do with the composition on the CRS and tin and the chargeability of the said two panels.

Thanks,

Erik ng
- Philippines
2006

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Erik, I suspect the problem is with the tin plate and not the charge on parts. When tin plate is manufactured, a small amount of hexavalent chrome is applied to the freshly plated tin to help prevent corrosion. Typically, tin plate is not painted as this chrome treatment makes it difficult to get good adhesion.

Hopefully, you do not have to apply the polyethylene powder to tin plate in production.

Roy Nuss
Trevose, Pennsylvania, USA
2006