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The steel structure is generally pneumatic high-pressure airless sprayer.
Due to the relatively high viscosity of the coating, high-pressure airless spraying can effectively extend the service life of the steel structure, play an anti-corrosion role, the key words can effectively save costs, reduce equipment maintenance failures, the use of high-pressure airless spraying machine is still good.
Steel structure is a structure that is mainly composed of steel materials and is one of the main types of building structures. The structure is mainly composed of steel beams, steel columns, steel trusses and other components made of section steel and steel plates, etc., and the components or components are usually connected by welds, bolts or rivets. Because of its light weight and simple construction, it is widely used in large-scale factories, venues, super high-rise buildings and other fields.
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The general process of steel structure spraying is to spray three coats of paint, epoxy zinc-rich primer, epoxy micaceous iron intermediate paint and polyurethane. Therefore, it is recommended to use a high-pressure airless sprayer for construction work. And it needs to be equipped with an air compressor as the power source of the high-pressure airless sprayer.
Before painting, you need to use a sandblasting machine to remove rust, and the sandblasting machine can choose the appropriate model according to the size of your components. For details, please consult Hualian Machinery and Equipment****.
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Zinc-rich epoxy can easily clog and corrode airless sprayers.
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It mainly depends on whether you are on-site construction or plant construction, mainly conveying, spraying room, drying (drying) room, spraying system, paint transmission and distribution system, automation or robot coating system. We are a professional enterprise for automated painting, Qingyan Tongchuang Robot Company, dedicated to robot coating. At present, it has good applications in military industry, steel structure, auto parts, and containers.
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Dear, I am glad to answer for you: steel structure painting process A: The steel structure painting process is as follows:
Steel structure paint process base treatment, anti-rust paint, putty scraping, phosphating primer, topcoat. 1.The base treatment first removes the floating soil, sand, mortar, oil stains, rust spots, welding slag, burrs, etc. on the metal surface.
Surface rust removal is then carried out by hand treatment. If the metal surface is generally floating rust, you can first use a wire brush to reciprocate and brush, then use a coarse abrasive cloth to polish a new bright surface, and then use an old cloth or cotton yarn to wipe the floating ash and rust under the polishing; If the metal surface of the steel component is more seriously corroded (scaly rust spots), first use a shovel blade to shovel off the rust scales, and the side section can also be cleaned with a hammer or scraper, and then brush with a wire brush to clean, and then use an abrasive cloth to polish until it is bright, you can apply anti-rust paint. Large areas of rust can be removed with grinders, wind mills and other electric rust removal tools, and then equipped with wire brushes, files, steel shovels and abrasive cloths and other tools to remove the remaining rust and sundries through the brush, file and grinding.
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The process flow and construction method of steel structure painting are as follows:
First, the process flow:
Base treatment: 881-D07 Epoxy Zinc Phosphate Primer or 881-D02 Epoxy Cloud Iron Primer Brush 881-H01 modified epoxy topcoat.
Note: All processes should be carried out in the order of the arrows.
Second, the construction method:
Basic requirements for painting.
When the relative humidity is greater than 80% or the ambient humidity is lower than 5 or rainy days, it should not be applied. (The project can remove part of the top sun panel to reduce humidity).
The mixing ratio, mixing method, and application interval of the paint should be operated according to the product instructions.
Grassroots treatment. The original coating system and the corrosion products of the metal bottom layer are cleaned with a grinding disc to achieve ST2 level.
Remove dust and oil from surfaces.
Coated with 881-D07 Epoxy Zinc Phosphate Primer (recommended) or 881-D02 Epoxy Micaceous Iron Primer According to the ratio specified in the product manual, the type and amount of diluent.
Once the surface of the steel member has been cleaned, the zinc epoxy phosphate primer must be applied within 8 hours.
A total of 3 coatings.
The brushing method is adopted, and the brushing method is applied evenly, and the coating must not be missed, so that the thickness of the dry film is 150 m.
Painted 881-H01 modified epoxy topcoat (white).
Prepare according to the requirements of the product manual.
The primer is applied after 6 hours of drying.
A total of 2 coats, each pass interval of >2 hours, < 24 hours.
Use the brush coating method, evenly brush, and do not sag, miss the coating, so that the paint film reaches 80 m.
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The practice of painting steel structures.
1. The general arc spraying equipment is composed of a rectifier power supply, a control device, a spray gun, a wire reel frame or a wire feeding device, and a compressed air supply system. The wire reel holder and compressed air supply system are the same as wire flame spraying. In addition to having a great relationship with the spraying material, the process parameters of arc zinc spraying and aluminum spraying also depend on the equipment and production efficiency requirements used.
2. The application of steel structure spraying in China, arc spraying, long-term anti-corrosion technology, since the 90s of the 20th century, especially the arc spraying application in metal spraying technology, is the most common, and its application prospect is also more extensive. The principle of arc spraying anti-corrosion is to use arc spraying equipment to heat, melt, atomize and spray two live metal wires (such as zinc, aluminum, etc.) to form an anti-corrosion coating, plus a long-term anti-corrosion composite coating of organic sealing coating The significant characteristics of the coating are:
It has a long corrosion resistance life, and its anti-corrosion life can reach more than 50 years, and the anti-corrosion coating does not need any other anti-corrosion maintenance during the 30-year service life; After 30 years, only the sealing coating needs to be brushed on the arc spray coating; There is no need to re-spray, and the coating is effective for a long time.
The arc spray coating has excellent coating adhesion with the metal substrate (up to more than 10MP), and the metal spray coating is combined with the base metal with mechanical inlay and micrometallurgy, which can also ensure that the anti-corrosion coating does not fall off, does not peel, is firmly bonded and has a long-term effect of anti-corrosion under slight bending, impact or collision, which is not achieved by any other surface anti-corrosion coating.
The application of steel structure painting.
1. It has been widely used in coal mines, railways, water conservancy, ports and wharves, metallurgy, machinery, radio and television, medical treatment, electric power, fire protection and other fields. China has fully capable of using arc spraying long-term anti-corrosion technology to solve the corrosion protection problem of national large-scale steel structure bridges.
2. The heavy anti-corrosion technology of bridge steel structure has gradually formed two major development trends, which is a rapidly developing heavy anti-corrosion system based on inorganic zinc-rich coatings, and a relatively mature heavy anti-corrosion system based on metal spray coatings.
Anti-corrosion system, these two systems have attracted the attention of various types of steel structure bridge anti-corrosion due to their excellent anti-corrosion performance and environmental adaptability.
In the next few decades, it will save the country a lot of anti-corrosion maintenance costs for steel structure bridges, and reduce.
Environmental pollution, prolonging the service life of steel bridges, and producing huge economic and social benefits.
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(1) Surface treatment of steel before painting.
General provisions for the surface treatment of steel.
1) The surface treatment of the building steel structure engineering should be carried out in strict accordance with the rust removal method specified in the design after the steel structure production and installation acceptance is qualified, and reach the specified rust removal grade.
2) Clean up the burrs, weld coatings, welding spatter, oil, dust, acid, alkali, salt and other pollutants on the surface of the steel before rust removal. The method of removing oil stains is determined according to the material of the workpiece, the type of oil stain and other factors, and usually solvent cleaning or lye cleaning is used.
3) The maintenance paint of the component should be treated according to the specific situation, if the coating is intact, it can be fluffed with abrasive cloth and steel wool, and the primer can be sprayed directly after cleaning. If the coating is damaged, it must be completely removed.
Steel surface rust and rust removal grade standards.
The steel surface corrosion grade and rust removal grade (GB8923-88) standard divides the steel surface into four rust grades of A, B, C, D
a. Completely covered with oxide scale, with almost no rust;
b. Rust has occurred, and part of the oxide scale has peeled off;
c. The oxide scale is peeled off due to rust, or it can be scraped off with a small amount of pitting;
dThe oxide scale is fully peeled off due to rust, and some pitting corrosion occurs.
The standard divides the rust removal grade into three types: jet or projectile rust removal, manual and power tool descaling, and flame descaling
1) Jet or projectile rust removal, represented by the letter "sa", is divided into four grades:
SA1 mild spray or projectile rust removal. The surface of the steel should be free of visible grease or dirt, and there should be no build-up such as scale, rust and paint coating that is not firmly adhered to. See GB8923-88 or ISO8501-1 for typical samples**BSA1, CSA1, and DSA1.
SA2 is thoroughly sprayed or projectile to remove rust. There is no visible grease and dirt on the surface of the steel, and the oxide scale, rust and other attachments have been basically removed, and the residue should be firmly attached. See BSA2, CSA2, DSA2.
Very thorough spray or projectile rust removal. There are no visible grease, dirt, scale, rust and paint coating and other build-up on the surface of the steel, and there are no traces of any residue.
It should be only a slight pigmentation in the form of punctates or strips. See..
SA3 makes the steel appear clean by jetting or projectile rust removal. The surface of the steel is free of visible grease, dirt, scale, rust and paint. This surface should show an even metallic sheen. See ASA3, BSA3, CSA3, DSA3.
2) Hand and power tool rust removal, denoted by the letter "ST", there are only two grades: ST2 Thorough Hand and Power Tool Rust Removal. There is no visible grease and dirt on the surface of the steel, and there are no build-ups such as scale, rust and paint that are not firmly adhered to.
See BST2, CST2, DST2.
ST3 is very thorough for manual and power tool rust removal. The surface of the steel should be free of visible grease and dirt, and free of build-up such as scale, rust, and paint coatings that are not firmly attached. Rust removal should be more thorough than ST2, and the substrate should be exposed on the surface.
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To put it bluntly, the steel structure is to clean the steel structure and remove the dust and stains. The use of steel structures has been more than 2,200 years old, and it is very important to paint and maintain the steel structures regularly.
For high-quality blankets or antique steel structures, it is best to use natural vegetable acids and plant alkaline agents for spray painting and rust removal. It will not damage the hair cuticle of the wool and damage the hair quality. It will also make the washed steel structure wool both shiny and oily, adding to the beauty.
The step of spraying paint and removing rust is to first beat the soil, put it on the barbed wire and lay it flat face down, whip the back of the blanket with a soft whip, and blow out the dust that has entered the root of the hair. Then the painting is carried out, some by machine, some by hand. Xu's steel structure still adopts the ancient method of manual painting and rust removal, which can not only master the strength of brushing, but also protect the pile of the steel structure with plant acid and alkali agents.
Spray paint and rust removal: Paint needs to be sprayed regularly.
Paint and rust removal, painting tips: Experienced and trained employees will regularly paint and remove rust for buildings and office buildings, so as to extend the service life of steel structures and provide a healthy office environment.
Spray paint and rust removal service - spray paint and rust removal must be sprayed regularly, and the benefits of spray paint and rust removal must be sprayed regularly;
Almost all the decoration of modern offices are made of steel structure, because laying steel structure can reduce the noise of the office, provide great convenience for indoor computer wiring, and it is more magnificent. But laying the steel structure also has a very bad side, that is, the problem of cleaning and hygiene, if the steel structure is soiled, it is not only very ugly, but also can breed bacteria or dust mites. Therefore, each Beijing center should arrange a steel cleaning plan for its office to keep the steel structure clean at all times and prevent the growth of bacteria.
From a professional point of view, it is recommended that the steel structure of the office be painted at least once a quarter. If the office is crowded or if the painting conditions allow, it is best to spray once a month.
Painting and rust removal - thorough painting of steel structures.
During the service life of the steel structure, sometimes cleaning with a vacuum cleaner cannot restore the clean appearance of the steel structure. There are four main indicators to determine whether a thorough painting is required: the steel structure is tangled and sticky; The color of the steel structure is no longer the same as the color of the leftovers of the new steel structure that you have left; The steel structure around the chair has a whole circle of stains; The steel structure will kick up a lot of dust as you run through the room.
If your steel structure meets any of the above four conditions, it will need to be thoroughly painted. If you don't have the time and energy to do a thorough painting yourself, it's best to hire a professional to do it; Taicang Machinery and Equipment Refurbishment Painting Center will serve you wholeheartedly;
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