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How To Remove and Prevent Rust Stains on Concrete

Rust is the flaky coating of iron oxide. It is reddish or orangish-brown in color and is the chemical reaction that occurs on iron by oxidation and moisture. If not addressed quickly or properly, it can permanently damage the item and potentially compromise its functionality. It can also cause stains to the item and on whatever the item is resting.

Causes of Rust on Concrete

Rust will likely form on the surface of concrete if iron items are left out in the rain, snow, humidity, and other wet elements or conditions. For example, if bolts, tools, or chains are left on concrete in the rain, rust will form on the slab as well as the metal. Another common cause of rust on concrete is the reinforcing rebar inside the concrete wall or slab. If the concrete is damaged or cracked near the rebar or if the rebar was carelessly placed so that it is near the surface, water can get in causing the rebar to rust and expand. This will eventually cause too much pressure on the slab and the slab will break, allowing for more damage and rust to occur.

Removing Rust from Concrete

The rust stains will not necessarily cause damage to your concrete slab, but it is considered by many to be an eyesore. Thankfully, ridding your concrete of these unsightly stains is fairly simple. Like with all stains, the sooner it is addressed the better. Keep in mind that rust stains differ from actual rust. Before you attempt to remove the stain, you must remove the solid chunks and flakes of rust. Along with the solid pieces of rust, you’ll want to remove any other debris, like leaves, concrete chunks or rocks, and dust. Next, you’ll need to decide if you’ll approach the stain with a natural cleaner or a chemical cleaner. A natural approach can be just as effective as chemical cleaners and is inexpensive. An added bonus — you might even have most or all of these products at home already. Lemon juice and vinegar are both great options and can easily remove rust stains. The more concentrated the liquid, the more acidic and effective it is. Pour either the lemon juice or vinegar right onto the stain and let it soak for ten or so minutes. Then, with a firm-bristled brush and plenty of elbow grease, scrub the stain. Rinse the area after a few minutes of scrubbing or once you see the stain has lifted. For more serious stains or for stains where the natural method didn’t work, purchase a commercial grade rust remover from your local hardware store. This stuff contains acids that are much stronger than lemon juice and vinegar, so you’ll want to take proper and protective precautions for yourself and others. For the best, most effective results, be sure to follow the manufacturer’s instructions closely. Whether you choose a natural or chemical approach, be careful of the surrounding flora and fauna.

Preventing Rust on Concrete

The best way to prevent rust stains on your concrete is to remove any metal objects from the surface. For objects, like metal furniture, that can’t be moved or that you don’t want to move, apply a coat of sealant or paint each year before the wet/rainy season.

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Tags: concrete decking, concrete decks, concrete epoxy, concrete repair

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Hard Rock Concrete Coatings is Utah’s premier concrete coating expert. We specialize in everything from acid staining, waterproof decking, epoxy coatings, concrete sealing, repair, and the most unique concrete countertops in the state. With our experience and top of the line products, we can guarantee satisfaction. We take the time to make each job unique so it will be something that we and the customer can be proud of.

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Hard Rock Concrete Coatings

140 W Lazy Acres Ln, Kamas, UT 84036
801-918-3656
801-918-3852

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