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Ted Mooney, P.E. RET
Pine Beach, NJ

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Flash corrosion issues after soda blasting

Our cast iron and aluminum parts are blasted with sodium bicarbonate and then rinsed with citric acid ⇦ this on eBay or Amazon [affil links] to dissolve the carbonate film. However, in the intermittent period before painting (that could vary from a few hours to days), flash corrosion occurs. From research, it seems that amine-based inhibitors may work. Is this the way to go, or are there better options that I am missing?

Thanks,

Heinz Wormsbecker
Plating shop - Thunder Bay, ON, Canada
2007

Yes, you can use paintable sealers to give you some short term protection. However, in my opinion, the best option with cast parts is to paint them as quickly as possible.

Christian Restifo
- Pittsburgh, Pennsylvania, US
2007

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