1 20 grams of rust-proof anhydrous sodium carbonate, 5 grams of emulsified oil, 1 g of sodium nitrite, 1000 g of water at 60--80°C, mix and stir these raw materials. Use this rust inhibitor to clean the metal rust and dry it. The washed metal objects will not rust for months. In addition, 1000 g of water was heated to 60--80°C, 20 g of anhydrous sodium carbonate was added, and 5 g of lactic acid was added. After mixing, the anti-rust effect was also good.
2 200 grams of rust ammonium citrate, 40 grams of sodium phosphate, 12 milliliters of sulfuric acid, 20 milliliters of formaldehyde, and 41 milliliters of 664 detergent. The above five kinds of raw materials were successively put into 800 g of clear water, mixed and stirred, and fully dissolved. When it is used, scrub it with a cotton gauze solution first. After a layer of black ash is produced, wipe it with a clean cotton yarn to make it bright. Another method of removing rust is to apply undiluted emulsified oil to the rusted surface of the metal and, after more than half an hour, wipe off the rust by gently wiping with a cotton yarn, grate, or hot water. The above methods are suitable for agricultural implements and are suitable for derusting and rust prevention of all metal objects.
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