According to the parts, the boiler paint can be divided into boiler outer wall, water tank inner wall, buried part, equipment base and insulation pipeline outer wall. Epoxy, polyurethane coating, epoxy water tank coating, epoxy coal tar pitch and high temperature resistant coating are selected for coating.
1、 Surface treatment before boiler paint construction
(1) before the implementation of anti-corrosion paint coating, the inner wall must be sandblasted, and after sandblasting, it shall reach Sa21 / 2 in rust grade and rust removal grade of steel surface before coating (GB / t8923). The sand blasting treatment grade of the outer wall surface is the same as that of the inner wall. If power tools are used for mechanical grinding and derusting, the derusting grade must reach ST3.
(2) the surface of thermal insulation outer wall shall be derusted by hand and power tools, and the derusting level shall reach ST2.
(3) after surface treatment, the steel surface shall be free of visible grease, dirt, oxide skin, rust, paint coating and other attachments, and any residual trace shall be only a slight spot or stripe, and the surface shall be clean, dust-free and dry to before coating.
(4) the primer shall be applied as soon as possible after the pretreatment of the painted surface is qualified. If it is too late to apply primer or the painting money is drenched in the rain, the painting money shall be re treated.
2、 Paint construction
(1) in addition to the implementation of specifications and design, the anti-corrosion construction shall also be carried out in accordance with the product instructions of the coating manufacturer.
(2) the surface treatment shall reach the specified derusting level before anticorrosion, and the surface shall be clean, dry and free of grease before coating, and the roughness and cleanliness shall be maintained until the first coating. All dust requires thorough cleaning.
(3) coating shall be carried out under the allowable climate conditions. The ambient temperature is 5-35 ℃, the relative humidity of air is not more than 85%, and the temperature of steel plate must be higher than the dew point by more than 3 ℃. When the construction environment temperature and relative humidity change, please refer to the product description of the material manufacturer.
(4) during the construction, when the coating may be polluted by oil, corrosive medium, etc., corresponding protective measures shall be taken. Avoid construction in rainy and snowy days, humid and foggy environment.
(5) for the two-component packaging of paint, the mixing ratio must be mixed according to the proportion given by the material manufacturer, and the paint can be used only after it is evenly stirred and the curing time reaches the specified value, and it will be used up within the specified mixing service life.
(6) before construction, the quality of anticorrosive materials shall be inspected, and the construction can only be carried out after the coating, name, color and design regulations are met.
(7) the painting work shall be careful, and it is not allowed to be uneven, concave, air hole, sagging, spraying, peeling, blistering, peeling, paint cracking, insufficient curing or rust on the bottom layer.
(8) after the completion of each process, the quality inspection shall be carried out, and the unqualified must be handled again. The acceptance shall be carried out according to the specification requirements after the construction.
(9) the media of the same system shall be painted with the same color (base color), and the various media of the system shall be distinguished by pipeline signs.
3、 Boiler paint coating supporting system (a boiler coating anti-corrosion scheme)
1. Anti atmospheric corrosion
Primer: modified thick paste epoxy primer 2 × 40 μ M
Finish: acrylic polyurethane 2 × 40 μ M
Total film thickness (dry film): 160 μ M
2. Anti corrosion of inner wall of water tank
Modified abrasion resistant epoxy paint 4 × 50 μ M
Total film thickness (dry film): 200 μ M
3. Soil corrosion (external wall of uninsulated buried pipeline)
Modified epoxy aluminum powder paint 4 × 125 μ M
Total film thickness: 500 μ M
4. Equipment base (including thermal insulation equipment)
Thick pitch paint 3 × 100 μ M
Total film thickness (dry film) 300 μ M
After the installation of the equipment, the epoxy cement shall be filled between the steel plates of the wall and the base, and the whole base shall be scraped to form a smooth slope, and then the top coat shall be applied twice.
5. Insulated steel equipment and pipes
Option 1
Oil red lead Antirust Paint 2 × 30 μ M
Total film thickness (dry film): 60 μ M
Option 2
Inorganic zinc rich primer 1x50 μ M
Total film thickness (dry film): 50 μ M
Paint, paint consulting phone 4000-197-58013980509008
Welcome to inquire, factory direct sales, large quantity is preferred
TEL : 13980509008 , 028-85188757
4000-197-580 Sichuan Xingyuan special coating Co., Ltd
{ipn8710 non toxic drinking water coating, IPN POLYMER interpenetrating network coating, FHC fluorocarbon paint, conductive and anti-static paint, tank outer wall thermal insulation and anti-corrosion paint, aviation marking paint, FVC heavy anti-corrosion paint, polyurethane paint, acrylic polyurethane paint, acrylic aliphatic polyurethane paint, epoxy zinc rich primer, inorganic zinc rich primer, epoxy sealing primer, epoxy glass flake mastic, epoxy Coal tar pitch paint, epoxy resin self leveling, solventless epoxy floor coating, silicone high temperature resistant, epoxy micaceous iron intermediate paint, epoxy iron red primer, bridge special coating}
Sichuan Xingyuan special coating XY -- 19724 hours free consultation hotline: 4000-197-580
Official website: http://www.xy97.cn
Find official account: Sichuan Xingyuan special coating