Steel structure coating process
The coating of steel structure shall be carried out after the inspection of the quality of the components. Derusting brush paint in accordance with the design requirements.
Derusting grade steel surface should be based on the original state, determine the selection of primer, derusting method used and the project cost and other factors. When manual derusting, derusting quality should not be lower than the current national standard. Derusting process of steel structure can be divided into the following steps: primary treatment, application of phosphating primer, anti rust paint.
(I) primary treatment
The base is the foundation of steel structure rust coating, in primary processing, first of all to clean the metal surface air, mortar, rust and burr, and then from the surface rust, this method can be used for manual processing. For some of the more difficult to deal with rust, available sandpaper repeatedly polished, to ensure clean surface for corrosion; especially serious, can be rust with the shovel shovel, use sandpaper polished until they are bright.
(two) primer
In order to ensure that the metal surface of the paint has good stick force, prevent rust corrosion, can be on the surface of the steel structure of the first coating layer of phosphating primer.
(three) brush paint
In the process of painting, the surface of the coating must be kept dry. In the process of painting, be sure to brush in place, brushing uniform. The gap gap is not easy to brush the steel parts, should be split crevice derusting and painting process finished before assembling, but get into the paint shall not rivet hole, so as to avoid the eyes of slag nail after riveting.
(four) surface finish
After the completion of the installation of steel finishing paint.
In summary, the application of steel structure generally comprises the following steps: the component rust treatment should be immediately after spraying maintenance primer (red lead alkyd antirust paint, coating thickness 25~30 ~ m), and then coated with two alkyd antirust paint (intermediate paint), coating thickness of 50~60 m, the production is completed, then coated with two alkyd varnish (paint), coating thickness 40~50 m, one of the last topcoat after the installation site should be coated. Coating dry film thickness: outdoor not less than 150 m, indoor not less than 125 m, brushing times should not be less than 4 times. High strength bolts shall not be coated with anti rust paint, but should be coated with epoxy zinc rich paint. Repair paint a total of 5 times, each layer as above, coating thickness of 115~140 microns. The color of the paint shall be determined according to the actual engineering requirements.
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