You can do like the Navy and clean and paint. The best way is to clean the area with steel wool, a wire brush or sand blasting. Then apply a good rust preventive primer and a good top coat. Zinc is good to use since it is a sacrificial metal. That is that it corrodes rather than the metal you are trying to protect. It is the same material used for galvanizing. It can be found in hardware stores as cold galvanize. It sprays on like paint.
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