Advantages and disadvantages of derusting methods for steel structure

1, Manual rust removal

This method is the use of scraper, shovel knife, hammer, steel wire brush and other steel work, by hand knock shovel, as well as with emery cloth, sandpaper and grinding wheel for manual grinding to remove dirt, so that the surface of the component is basically no oil, no rust, no burr.

Advantages: convenient, simple equipment required, low labor cost, not limited by the size of the construction site conditions, is often used in steel structure maintenance engineering rust removal method.

Disadvantages: poor working conditions, low efficiency, rust removal is not complete, quality is not guaranteed.

2, Sand blasting rust removal

Sandblasting derusting is to use compressed air, the sand of a certain size is sprayed on the surface of the workpiece rust through sandblasting gun, which can achieve rapid derusting and surface preparation for painting, spraying, electroplating and other processes.

Advantages: through the sand blasting machine will be steel structure members of the day rust clean, exposed to the natural color of metal. This method removes rust thoroughly. It is also more efficient.

Disadvantages: it will cause dust flying, which has certain influence on the health of the operator. It is suitable to be used in the construction and maintenance projects.

3, Pickling rust removal

Pickling rust and scale removal is a physical and chemical process, mainly chemical process, its mechanism is very complex, the role of various acid washing liquid is not exactly the same, but mainly due to the dissolution, stripping and loosening of acid.

Advantages: will not cause metal material deformation, processing surface is not rough, simple operation, high efficiency, metal products in each corner of the rust can be removed, suitable for a large number of small products rust removal, and do not need special equipment, low cost.

Disadvantages: pickling rust is mostly used in oxalic acid, hydrochloric acid and other strong acid pickling, strong acid is very corrosive, not only easy to cause harm to the human body, but also easy to cause damage to steel, easy to make steel brittle hydrogen problem.

4, Rust conversion coating - rust conversion agent

Using special emulsion as film forming material, adding wetting and permeability additives and functional additives refined. After transformation, passivation coating prevents oxygen, water vapor, chloride ions from further corrosion of the substrate, to achieve the purpose of rust prevention. Water-based products, high viscosity, can be applied to facade construction, construction process save time, effort, worry and money.

Advantages: water-based products, non-toxic non-flammable non-explosive; No need to remove rust or simple cleaning, construction efficiency is doubled, reduce construction cost. Direct reaction with rust, steel structure of the tiny corner can also be rust removal rust in one step, good adhesion to the metal substrate.