Question

why painted iron does not rust
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Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

Painting prevents rust by excluding water, electrolytes, and air from the ferrous metal. Outside of the laboratory, chemically pure iron does not exist. Chemically pure iron in distilled water does not rust, even impure iron in distilled water takes much longer to start rusting than it does with electrolyes. There is a slight electrical potential difference between the tiny pockets of impurities in ferrous metals and the substrate. This, along with water with some electrolyte content can initiate rusting, which involves electrolysis in the same way as a battery discharging. In some cases anodization can eliminate enough of this action to be pretty rust inhibitive. The best method I know of which is easily available would be the use of a vinyl wash pretreatment prior to priming and painting. This has a slight etching activity in a very tightly adhering thin glaze, about 1/10th mil, which undercuts any possible contact of the metal with anything which can initiate rusting. The surface should be very clean before using. I don’t know if this is even still available. If it is it would be sold at a marine supply. Be sure to prime it as soon as it is dry to insure adhesion, if you wait 24 hours it will dry so tightly that it can interfere with adhesion. There are mildly acid prewash treatments like Ospho more readily available and barium based black preprimer/ rust conversion coatings. While I would guess these are better than nothing, they are not very effective in my experience. Good luck