Galvanized iron is a unique type of metal that must be treated with care when you are removing rust. At first, you might think that any chemical rust removal product would do the trick, but in fact many of these chemicals will remove the galvanized coating that makes this type of iron idea for outdoor uses--especially if they contain phosphorous. The best way to remove rust from galvanized iron requires a combination of tactics that will strip off the rust while leaving the galvanization intact.
Instructions
1. Clean off the galvanized iron. If you have a large piece of metal, pressure-wash it to remove as many rust flakes as possible. If the item is smaller, rinse it with a garden hose. Once the item is rinsed clean, wipe it down with a damp rag that has three drops of liquid detergent on it. This will remove dust, dirt and grime so that the rusted areas are easier to spot.
2. Mix up your oxalic acid. Oxalic acid, also called wood bleach, comes in a powdered form and generally is mixed with water to form a liquid. To treat rust on galvanized iron, however, measure several cups of the powder into the plastic bucket, then add water a cup at a time until a thick paste has formed that can be spread, but that will not run. Wear your gloves and goggles during this step and from this time forward.
3. Spread the oxalic acid paste on the rust spots. Cover them completely, and allow the paste to sit on the spots for five to 10 minutes. You may see the rust lifting off the metal and staining the paste. Do not leave the paste on the metal for more than 10 minutes.
4. Rinse off the wood bleach paste. Use the pressure washer or the garden hose to thoroughly rinse off the area. Once it is clear, tackle any remnants of rust or rust stains with the wire brush until they are completely gone.
5. Clean the galvanized metal thoroughly. Use the pressure washer or hose and the cleaning rags with liquid detergent to wipe down the entire area and make sure that all oxalic acid residue and rust residue is completely gone. Dry the metal rather than allow it to air dry to prevent flash rust formation.
Tips Warnings
If you are planning to paint the galvanized iron, use an oil-based, rust-inhibitive primer to help prevent the recurrence of rust.
Oxalic acid is a common cleaner but it is still an acid. Wear protective gloves and eyewear, and keep it out of reach of children.
Tags: remove, rust, iron, galvanized iron, Clean galvanized, completely gone, garden hose, liquid detergent, oxalic acid, pressure washer, that will, will remove, wipe down, wood bleach
