1 scope
The technology standard is suitable for use in construction steel structure anticorrosion construction technology for the project.
2 construction preparation
2.1 material
2.1.1 construction steel structure project selection of anticorrosive materials shall comply with the design requirements. Materials for anti-corrosion primer, paint, thinners, etc. Construction steel structure engineering with red lead oil antirust paint, anti-corrosion primer molybdate red epoxy ester antirust paint, etc.; Construction steel structure anticorrosion paint with various alkyd enamel and various alkyd ready-mixed paint, etc. All kinds of anti-corrosion materials should comply with the provisions of the relevant national technical indicators, shall also have the factory quality certificate.
2.2 the main equipment:
Sand blasting gun, air pump, recycling equipment, spray gun, spray pump, hose, shovel knife, hand wheel, emery cloth, wire brush, cotton silk, small small compressor, paint barrels, brush, pickling tank and accessories, etc.
2.3 operation conditions:
2.3.1 painter working operation certificate should have a special type of work assignments.
2.3.2 anticorrosion coating engineering steel structure engineering checked before acceptance, and meets the design requirements.
2.3.3 anticorrosion coating work site shall have security protection measures, fire and ventilation measures to prevent fire and poisoning accidents.
2.3.4 open-air anticorrosion construction work should choose appropriate weather, should wind, rain, cold should not work.
3 operation process
3.1 process:
Base cleaning to the primer coating, paint coating, acceptance check
3.2 base cleaning:
3.2.1 construction steel structure project upon the acceptance of the paint coating shall be installed in the steel structure. Before besmear to brush paint, to be part of the rust, weld coating, welding spatter, clean up the oil, dust and other sundry.
3.2.2 base cleaning derusting quality, directly related to the coating quality. So the base surface derusting quality of coating process is divided into primary and secondary, as shown in table 5-25.
Steel structure derusting quality grade table 5-25
Grade quality standard cleaning method
1 steel surfaces bared metal color sand blasting, shot blasting, pickling
2 steel products allowed to be kept clean the surface of the rolling skin clear general tools (wire brush, cloth)
3.2.3 in order to ensure the quality of coating, according to different needs can choose the following cleaning process.
3.2.3.1 sandblasting derusting, it is the use of compressed air pressure, continuously with quartz sand or iron ore impact the surface of the steel members, such as rust, oil on the surface of the steel cleaning to clean, bared metal steel as a method of cleaning. This method is of high efficiency, cleaning thoroughly, it is more advanced cleaning technology.
3.2.3.2 pickling, it is the need of coating of steel members, soaked in acid in the pool with acid to remove oil and rust on the surface of the component. Pickling process efficiency is high, derusting more thoroughly, but after pickling must use hot water or water components, if there is residual acid, component of corrosion will be more severe.
3.2.3.3 manual derusting, is by the artificial with some simple tools, such as blade, grinding wheel, emery cloth, steel wire brush tool, remove the rust on the steel members. This method is low working efficiency, poor working conditions, derusting nor completely.
Primer is 3.3:
3.3.1 blending red lead anti-rust paint, paint control the viscosity, consistency, degree, exchange should be fully mixing, paint color, viscosity uniform.
3.3.2 rainfall distribution on 10-12 brush the first layer when brushing paint the same direction, then if neat.
3.3.3 paint should be applied when frequently touch, the principle of the short brush, brush to prevent the flow with too many southbound crash.
3.3.4 brush for the first time, the gap should maintain a certain amount of time, to prevent the groove was dry on the second time, it would crash fat from the paint flow, lower quality.
3.3.5 for the first time after dry, brush again the second time, the second time brushing direction should be and for the first time brushing direction perpendicular to that can make the film thickness uniformity.
3.3.6 primer is to achieve at least 4 ~ 8 h after dry table, table dry before should not paint coating.
3.4 the paint coating:
3.4.1 track construction steel structure painting primer and finish among general clearance for a long time. Steel members to the site assembly after coating antirust paint, uniform coating paint only after assembly. So before coating paint for steel surface of clean, clear installation weld flux, go to burn or touch paint component, should also fill paint in advance.
3.4.2 topcoat modulation should choose color completely consistent paint, thinners exchange should be appropriate, paint should be fully mixing before use, maintain uniform color. Its viscosity, consistency, should guarantee the coating without flow doesn't brush lines.
Rule 3.4.3 paint in use process should be continuously stirred, coating method and the direction the same as the above process.
3.4.4 coating process using spraying construction, should adjust the nozzle diameter, spraying pressure, spray gun hose free to stretch to work area, air compressor air pressure should be kept in 0.4 ~ 0.7 N/was.
3.4.5 spraying should keep a good distance between nozzle and coating, spray gun and surface distance should be in commonly 100 mm or so, the spray gun with steel structure should keep vertical plane Angle, or slightly updip nozzle is advisable.
3.4.6 spraying nozzle should be parallel to the mobile, mobile should be smooth, speed is consistent, uniform coating. But using spraying, coating thickness is thinner, reason should be spray a few times more, each should be to the upper layer of spray paint film is dry.
3.5 coating inspection and acceptance:
3.5.1 track of surface coating construction and after construction, deal with protection coating of the workpiece, prevent the flying dust and other sundry.
3.5.2 coating processing after the check, it should be the coating color is consistent, clear bright color, not wrinkle the skin, no bumps.
3.5.3 of determining the thickness of coating film, film thickness is measured by touch point paint film thickness gauge, thickness of paint film thickness gauge measurement commonly 3 point, take the average.
4 quality standards
4.1 ensure project shall meet the following requirements:
4.4.1 paint, thinner and curing agent and other varieties, types and quality, and the state should comply with the design requirements of the standard rules.
Methods: to check the quality certificate or the reinspection report.
4.1.2 steel before painting surface rust removal and the state should comply with the design requirements of the standard provision: the chemical cleaning of steel surface should be metal color. After processing the steel surface should be no welding slag, welding scar, dust, oil, water and burr, etc.
Testing method: use the shovel to check and with the current national standard "steel surface before coating corrosion level and descaling grade image contrast observation of the check.
4.1.3 shall not coating, coating, coating should be no rust peeling and return.
Inspection method: to observe the examination.
4.2 the basic project shall meet the following requirements:
The appearance quality of the coating project of 2:
Qualified: coating should be uniform, no obvious wrinkled skin, bubble, good adhesion.
Good: coating should be uniform, colour and lustre is consistent, wrinkled skin, flow and bubble, good adhesion, color separation line clear and tidy.
Inspection method: to observe the examination.
4.2.2 component repair paint quality:
Qualification: paint film shall be complete.
Good: according to the coating process layered fill brush, paint film is complete, good adhesion.
Check the number: 10% selectiving examination by number of each type of component, but which should not be less than 3 pieces.
Inspection method: to observe the examination.
4.3 the dry film thickness of coating engineering allowable deviation of the project and inspection methods shall comply with the provisions of the table 5-26. Dry film thickness requirements value and deviation should be allowed to meet the construction and acceptance of steel structure engineering.
Check quantity: according to the same kind of numeral spot-check 10%, but should not be less than 3 pieces, each piece of measuring 5, the value of each for three point dry film thickness of about 50 mm apart the average.
Dry film thickness of the allowable deviation of project and inspection method table 5-26
Visual inspection method
Dry film thickness of components manufacture
Total dry film thickness
5 finished product protection
5.1 after coating steel members shall be temporary retaining isolation, prevent trod, damage to the coating.
5.2 after coating steel members, such as within 4 h in case of wind or rain, should be covered, prevent contamination of dust and moisture, affect coating adhesion.
5.3 after coating components to transport, attention should be paid to prevent knock against, prevent the drag on the ground, to prevent coating damage.
5.4 after coating of steel members do not contact with acids liquid, prevent bites coating.
6 should pay attention to quality problems
6.1 coating operating temperature should be between 5 ~ 38 ℃ advisable, when the weather temperature is below 5 ℃, should choose the corresponding application of coating material at low temperature.
6.2 when the temperature is higher than 40 ℃, should stop coating operations. Because of component temperature 40 ℃, in the steel surface besmear brushs the paint will produce bubbles, reduce the adhesion of paint film.
6.3 when air humidity is more than 85%, or component surface condensation, unfavorable coating operations.
6.4 steel members before the production, deal with hidden component parts, sandwich structure is difficult to cleaning, derusting, ahead of besmear to brush in advance.
7 quality records
Quality records of this process standards should possess the following:
7.1 steel grid structure primer coating product certificate.
7.2 steel grid structure paint coating product certificate.
7.3 the quality of the steel grid structure coating inspection records and reports.
The technology standard is suitable for use in construction steel structure anticorrosion construction technology for the project.
2 construction preparation
2.1 material
2.1.1 construction steel structure project selection of anticorrosive materials shall comply with the design requirements. Materials for anti-corrosion primer, paint, thinners, etc. Construction steel structure engineering with red lead oil antirust paint, anti-corrosion primer molybdate red epoxy ester antirust paint, etc.; Construction steel structure anticorrosion paint with various alkyd enamel and various alkyd ready-mixed paint, etc. All kinds of anti-corrosion materials should comply with the provisions of the relevant national technical indicators, shall also have the factory quality certificate.
2.2 the main equipment:
Sand blasting gun, air pump, recycling equipment, spray gun, spray pump, hose, shovel knife, hand wheel, emery cloth, wire brush, cotton silk, small small compressor, paint barrels, brush, pickling tank and accessories, etc.
2.3 operation conditions:
2.3.1 painter working operation certificate should have a special type of work assignments.
2.3.2 anticorrosion coating engineering steel structure engineering checked before acceptance, and meets the design requirements.
2.3.3 anticorrosion coating work site shall have security protection measures, fire and ventilation measures to prevent fire and poisoning accidents.
2.3.4 open-air anticorrosion construction work should choose appropriate weather, should wind, rain, cold should not work.
3 operation process
3.1 process:
Base cleaning to the primer coating, paint coating, acceptance check
3.2 base cleaning:
3.2.1 construction steel structure project upon the acceptance of the paint coating shall be installed in the steel structure. Before besmear to brush paint, to be part of the rust, weld coating, welding spatter, clean up the oil, dust and other sundry.
3.2.2 base cleaning derusting quality, directly related to the coating quality. So the base surface derusting quality of coating process is divided into primary and secondary, as shown in table 5-25.
Steel structure derusting quality grade table 5-25
Grade quality standard cleaning method
1 steel surfaces bared metal color sand blasting, shot blasting, pickling
2 steel products allowed to be kept clean the surface of the rolling skin clear general tools (wire brush, cloth)
3.2.3 in order to ensure the quality of coating, according to different needs can choose the following cleaning process.
3.2.3.1 sandblasting derusting, it is the use of compressed air pressure, continuously with quartz sand or iron ore impact the surface of the steel members, such as rust, oil on the surface of the steel cleaning to clean, bared metal steel as a method of cleaning. This method is of high efficiency, cleaning thoroughly, it is more advanced cleaning technology.
3.2.3.2 pickling, it is the need of coating of steel members, soaked in acid in the pool with acid to remove oil and rust on the surface of the component. Pickling process efficiency is high, derusting more thoroughly, but after pickling must use hot water or water components, if there is residual acid, component of corrosion will be more severe.
3.2.3.3 manual derusting, is by the artificial with some simple tools, such as blade, grinding wheel, emery cloth, steel wire brush tool, remove the rust on the steel members. This method is low working efficiency, poor working conditions, derusting nor completely.
Primer is 3.3:
3.3.1 blending red lead anti-rust paint, paint control the viscosity, consistency, degree, exchange should be fully mixing, paint color, viscosity uniform.
3.3.2 rainfall distribution on 10-12 brush the first layer when brushing paint the same direction, then if neat.
3.3.3 paint should be applied when frequently touch, the principle of the short brush, brush to prevent the flow with too many southbound crash.
3.3.4 brush for the first time, the gap should maintain a certain amount of time, to prevent the groove was dry on the second time, it would crash fat from the paint flow, lower quality.
3.3.5 for the first time after dry, brush again the second time, the second time brushing direction should be and for the first time brushing direction perpendicular to that can make the film thickness uniformity.
3.3.6 primer is to achieve at least 4 ~ 8 h after dry table, table dry before should not paint coating.
3.4 the paint coating:
3.4.1 track construction steel structure painting primer and finish among general clearance for a long time. Steel members to the site assembly after coating antirust paint, uniform coating paint only after assembly. So before coating paint for steel surface of clean, clear installation weld flux, go to burn or touch paint component, should also fill paint in advance.
3.4.2 topcoat modulation should choose color completely consistent paint, thinners exchange should be appropriate, paint should be fully mixing before use, maintain uniform color. Its viscosity, consistency, should guarantee the coating without flow doesn't brush lines.
Rule 3.4.3 paint in use process should be continuously stirred, coating method and the direction the same as the above process.
3.4.4 coating process using spraying construction, should adjust the nozzle diameter, spraying pressure, spray gun hose free to stretch to work area, air compressor air pressure should be kept in 0.4 ~ 0.7 N/was.
3.4.5 spraying should keep a good distance between nozzle and coating, spray gun and surface distance should be in commonly 100 mm or so, the spray gun with steel structure should keep vertical plane Angle, or slightly updip nozzle is advisable.
3.4.6 spraying nozzle should be parallel to the mobile, mobile should be smooth, speed is consistent, uniform coating. But using spraying, coating thickness is thinner, reason should be spray a few times more, each should be to the upper layer of spray paint film is dry.
3.5 coating inspection and acceptance:
3.5.1 track of surface coating construction and after construction, deal with protection coating of the workpiece, prevent the flying dust and other sundry.
3.5.2 coating processing after the check, it should be the coating color is consistent, clear bright color, not wrinkle the skin, no bumps.
3.5.3 of determining the thickness of coating film, film thickness is measured by touch point paint film thickness gauge, thickness of paint film thickness gauge measurement commonly 3 point, take the average.
4 quality standards
4.1 ensure project shall meet the following requirements:
4.4.1 paint, thinner and curing agent and other varieties, types and quality, and the state should comply with the design requirements of the standard rules.
Methods: to check the quality certificate or the reinspection report.
4.1.2 steel before painting surface rust removal and the state should comply with the design requirements of the standard provision: the chemical cleaning of steel surface should be metal color. After processing the steel surface should be no welding slag, welding scar, dust, oil, water and burr, etc.
Testing method: use the shovel to check and with the current national standard "steel surface before coating corrosion level and descaling grade image contrast observation of the check.
4.1.3 shall not coating, coating, coating should be no rust peeling and return.
Inspection method: to observe the examination.
4.2 the basic project shall meet the following requirements:
The appearance quality of the coating project of 2:
Qualified: coating should be uniform, no obvious wrinkled skin, bubble, good adhesion.
Good: coating should be uniform, colour and lustre is consistent, wrinkled skin, flow and bubble, good adhesion, color separation line clear and tidy.
Inspection method: to observe the examination.
4.2.2 component repair paint quality:
Qualification: paint film shall be complete.
Good: according to the coating process layered fill brush, paint film is complete, good adhesion.
Check the number: 10% selectiving examination by number of each type of component, but which should not be less than 3 pieces.
Inspection method: to observe the examination.
4.3 the dry film thickness of coating engineering allowable deviation of the project and inspection methods shall comply with the provisions of the table 5-26. Dry film thickness requirements value and deviation should be allowed to meet the construction and acceptance of steel structure engineering.
Check quantity: according to the same kind of numeral spot-check 10%, but should not be less than 3 pieces, each piece of measuring 5, the value of each for three point dry film thickness of about 50 mm apart the average.
Dry film thickness of the allowable deviation of project and inspection method table 5-26
Visual inspection method
Dry film thickness of components manufacture
Total dry film thickness
5 finished product protection
5.1 after coating steel members shall be temporary retaining isolation, prevent trod, damage to the coating.
5.2 after coating steel members, such as within 4 h in case of wind or rain, should be covered, prevent contamination of dust and moisture, affect coating adhesion.
5.3 after coating components to transport, attention should be paid to prevent knock against, prevent the drag on the ground, to prevent coating damage.
5.4 after coating of steel members do not contact with acids liquid, prevent bites coating.
6 should pay attention to quality problems
6.1 coating operating temperature should be between 5 ~ 38 ℃ advisable, when the weather temperature is below 5 ℃, should choose the corresponding application of coating material at low temperature.
6.2 when the temperature is higher than 40 ℃, should stop coating operations. Because of component temperature 40 ℃, in the steel surface besmear brushs the paint will produce bubbles, reduce the adhesion of paint film.
6.3 when air humidity is more than 85%, or component surface condensation, unfavorable coating operations.
6.4 steel members before the production, deal with hidden component parts, sandwich structure is difficult to cleaning, derusting, ahead of besmear to brush in advance.
7 quality records
Quality records of this process standards should possess the following:
7.1 steel grid structure primer coating product certificate.
7.2 steel grid structure paint coating product certificate.
7.3 the quality of the steel grid structure coating inspection records and reports.
No comments:
Post a Comment