To reliably protect a steel product from corrosion, it can be coated with zinc. Its layer is much stronger than paint and is also abrasion resistant. Zinc coating can be applied at home using a very simple technology: zinc waste (old battery electrolyte); from an old carburetor, or buy granulated zinc at a chemical store. Carburetor pieces or granules are poured into a jar with a small amount of battery electrolyte. After about a day, the zinc will dissolve and the bubbles will stop. The resulting cloudy solution must be filtered through a funnel with cotton wool. Then a bath of water and soda is prepared. You will also need another glass jar, which must be filled with clean electrolyte. The zinc-coated part is ground and wiped with a solvent. Then it must be immersed in pure electrolyte for 10-20 seconds. After this, it is soaked in a soda solution and dried. Now the part in the treated area must be heated to 400-500°C. This is done using a hair dryer or torch. The degree of heating can be determined by the color of the spot. You will have to heat the metal until it turns gray. Once it starts to turn reddish-brown, you need to immerse the part in a zinc solution. After this, the remaining acid is washed off with water and soda. The process can be repeated several times to obtain several layers of zinc. Only in this case, it is difficult to determine the temperature without a pyrometer, since the dull color is not visible through the coating. If the part is too large to be dipped, the zinc coating can be applied by brush.
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