Need Methods to stop and prevent rust on cast iron

Gantt · Jan 19, 2020

I am refurbishing a 1946 Ford 2N and I have some pretty deep rust pitting on the cast iron transmission case. It s under the battery and at some point in its 70 years a battery had puked acid into the casing underneath. I have pitting about 1/4 inch deep. I know to stop rust you have to get it all out. Other than manually removing the rust, is there anything I can use to help prevent rust from coming back?? I plan on wire brushing all the loose rust out but I am hoping there is a chemical I can use to help stop it.

SkipperII · Jan 19, 2020

NAPA carries a product that oxidizes black, and seals it, it then acts as a primer, if you wanted to fill it.

rrlund · Jan 19, 2020

I would imagine Fluid Film would work on cast. I know it stopped the rust on my pickup fenders dead in its tracks two and a half years ago. It comes in a spray can like WD40.

Stephen Newell · Jan 19, 2020

Phosphoric acid works pretty good but the metal would then need to be coated with epoxy primer to keep the rust from coming back.

Traditional Farmer · Jan 19, 2020

I've used POR 15 on similar things with good results.

Fatamus · Jan 19, 2020

I would use any one of the products mentioned but first I would clean the heck out of everything extremely well with a heavy solution of Baking Soda and water to neutralize any acid residue. then let dry and clean again with either or acetone to remove any oily residue.
Good luck

Need Methods to stop and prevent rust on cast iron

Gantt

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SkipperII

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rrlund

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Stephen Newell

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Traditional Farmer

Well-known Member

Fatamus

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