Absolutely any ferrous metal is subject to the harmful effects of corrosion, however, as a result, not a single owner is interested in seeing on a metal product in his household that irritates the eye and consciousness "redheads". Special protective compounds will help to avoid the development of corrosion.
Before covering a metal product with any protective composition, it must be brought to the required condition. This may require a wide variety of tools, including metal brushes, scrapers, and sandpaper. First of all, all dust and dirt is removed from the product. Then we remove the rust that has already appeared and thoroughly clean the places of its formation. If the metal product is on the street, then you must definitely wait for good dry sunny weather.
Treating metal to protect against rust is highly recommended with cold zinc. It should be applied in three layers, after which any other paint is applied over the zinc. The first layer is done without fail in low humidity and sunny weather. Then a pause of 2-3 hours is maintained, after which the second layer is made. The third layer is applied 24 hours after the creation of the second. When another day has passed, any other decorative paint can be applied over the zinc.
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A three-layer paint coating with a high zinc content will protect any metal product from corrosion for 20-30 years. In any case, if everything was done completely correctly. When choosing paint for protection in a store, you should pay attention to the zinc content. It must be at least 95%. Any other protective paint will not boast impressive results in terms of protection.
In continuation of the topic, read about why the seams between armor plates on WW2 tanks won't rust for decades.
Source: https://novate.ru/blogs/120222/62147/