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Powder coating defect due to alloy manufacturing process

I am powder coating aluminum castings made by pressure die casting (typically ADC6 & AlSi53 alloy). While powder coating some lots gives pinholes on film of powder coating I have checked all my processes for any defect but there is not any process defect so I want to ask is there any reason to get pin hole because of any process defect in die casting process?

Deo Ashutosh
Powder coater - Pune, Maharashtra, India
2004

Dear Deo Ashutosh

Please check your degreasing chemical, its non casting base, and than check your drying process.

Rakesh Sharma
- Harayana, Gurgoan
2004

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