Steel structure corrosion and anticorrosion method
Surface treatment is the basis for the quality of the coating to ensure the quality of the coating, surface treatment, including rust removal and control of steel surface roughness. Rust can choose to deal with technical things, mechanical things disposal, sandblasting treatment. Chemical agent treatment [pickling, alkali washing, etc..
On the layout of the anti-corrosion treatment of the steel to the oak is not in the production conditions are not carried out, cough sand and chemical agents can not be used to dispose of the choice, the first is the use of technology and mechanical things rust:
Rust removal. Is old and simple way, that is common with the shovel, scraper, steel wire brush, grinding wheel, abrasive and hammer, by craft chipping, sanding away the steel surface rust, dirt and old paint and dust. The utility model has the advantages of convenient operation, and is not limited by the scale of the layout, but the labor intensity is large, the power is low, and the quality is difficult to ensure. It is necessary to choose the quality requirement.
Mechanical derusting. The use of pneumatic and electric tool grinder, 1 air gun (chipping), pneumatic needle scalers. It is better than the quality and power of rust removal technology, labor intensity is also a little smaller.
Sand blasting. In the production of local and open space can also be used for sand blasting derusting, it is reliable quality, rust completely. Sandblasting is the use of air compressor in the quartz sand from the steel surface to remove black skin eruption and rust, can also be used for steel, steel nine eruption (projection) on steel surface. The effect is very good, and can cut full of sand and dust. Sandblasting derusting quality is good, but poor working conditions.
Rust removal is the primary concern of coating corrosion. Disposal quality is crucial. The appearance of rust removal should be reached in the specification: the United States; the United Kingdom for BS4232; Germany for DlNl8364; Sweden for SIS, etc.. International standards used in Sweden, SIS specification will be divided into two types of surface treatment methods, St shows that the process of processing or electric things; Sa shows that sandblasting treatment. The degree of disposal will also be divided into o (untreated appearance), 1 (mild disposal appearance), 2 (moderate disposal appearance), the (nearly complete disposal of appearance), and the 3 (well disposed of appearance) level five, and the development of the standard color samples for comparison.
Normative rules:
The craft should be eradicated before the appearance of rust dirt grease, eradicate thick rust.
- wire brush.
- with the shovel, brush, grind stuff will loose scale, rust and oil dirt removed, then brush the compressed air will surface finishing, the treated surface with metallic luster on the county.
- the same as the above, but more complete, after the disposal of the table with a more significant metal luster.
The rapid - mild blasting, loose scale, rust and oil dirt removing foreign bodies.
-- selection of moderate sand blasting, get rid of some large scale, rust and oil dirt foreign body. Then brush compressed air will be the appearance of truth, after the appearance of a grey metal disposal.
- use a completely get rid of sand, scale, rust and oil dirt, and foreign body brush, compressed air will exist only appearance finishing, promised a handful of rust or rust marks, after disposal to approximate gray white metal surface appearance.
- very complete sandblasting treatment, completely remove the oxide, rust and foreign bodies, and then brush, compressed air completely finishing the surface, leaving no foreign body, after the treatment of a uniform appearance of white metal luster.
Rust removal process should not be less than ST3 level, as long as the adhesion of the paint coating to St2:
Any sand blasting is not less than Sal in non corrosive environment - disposal to reach Sa2 grade rubber derusting, heavy corrosion environment to reach the minimum surface rust disposal SA2 special level?.
After the surface treatment of steel, especially bump back, known as the appearance of roughness. The surface roughness is related to the selection of surface treatment methods and sand blasting data, and the influence of the rent on the corrosion resistance of the brown coating film. Roughness, adhesion helps Xu layer, but will reduce the thickness of the coating between the thin steel surface bump, simple occurrence of pinholes, reduces the coating anti rust ability; vice versa. Such as roughness, the adhesion of the coating will decline; blasting data more fine, coarse appearance more uniform, hospital the rust rate is better.
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