Rust removal of steel

 Rust removal of steel

When steel corrodes, as the volume increases, the steel bars in reinforced concrete will cause the concrete to swell and crack.

At present, there are three general rust removal methods as follows.

1) Wire brush to remove rust

All the rust on the surface of the steel can be brushed off manually with a steel wire or a semi-automatic wire brush until the metal surface is exposed. This method has low work efficiency and the quality of rust removal cannot be guaranteed.

2) Pickling and derusting

Put the rusted steel into the pickling tank, remove the oil and rust respectively until the surface of the component is all iron gray, and clean it up to ensure that there is no residual acid on the surface. This method is more thorough than manual rust removal, with high work efficiency and good effect.

3) Sand blasting to remove rust

Clean the rust on the surface of the steel through a sandblasting machine until the surface of the component is off-white, and there must be no yellow. This method is a more advanced rust removal method.

The antirust measures for concrete reinforcement are mainly based on the nature of the structure and the environmental conditions, etc., considering the quality requirements of the concrete, that is, limiting the water-cement ratio and the amount of cement, and strengthening construction management to ensure the compactness of the concrete and sufficient The thickness of the protective layer limits the dosage of chlorine salt admixture.

For prestressed reinforcement, the carbon content is generally high, and most of them have been deformed or cold-drawn, so they are more sensitive to corrosion damage, especially high-strength heat-treated steel bars, which are prone to stress corrosion. Therefore, important prestressed load-bearing components should be strictly inspected for raw materials, except that chlorine salt cannot be used. For the rust removal measures of reinforcement, there is also a method of mixing rust removers (such as dichromate, etc.).

Shengtian Industrial provides a full range of steel products and products.Steel material manufacturers.In china.We can supply the steel plate,steel coil,round steel,structural steel,flat steel.