Repairing the Future . . . Metal roof anti-corrosion repair system construction process.

Engineering Overview
A production workshop roof anti-corrosion project roof using metal plate, rock cotton composite steel plate, due to the poor quality of metal roof plate anti-corrosion paint, the production workshop internal temperature, humidity is high, resulting in serious corrosion of indoor roof metal plate.
construction preparation
material types
anti-corrosion 1 (water-based high-efficiency protective rust coating)
anti-corrosion 2 (water-based multi-functional anti-corrosion coating)
anti-corrosion 3 (water-based anti-corrosion surface coating)
main implements
implements: air compressor, airless sprayer, electric polishing machine, water cannon, etc.
tools: blades, wire brushes, brushes, etc.
Construction conditions
construction environment temperature should not be less than 5 degrees C, relative humidity should not be greater than 70%
construction environment should maintain good ventilation, no soot, dust and water vapor



it is strictly prohibited to paint in the sun, not with other chemical substances stacked in the
same place


construction process
grass-roots treatment→ anti-corrosion No. 1 →septhproofing No. 2→ anti-corrosion No. 3 →re-inspection
grass-roots treatment: clean up dirt oil, remove rust
a) artificial rust removal: the use of blades or wire brushes and other tools, will need to be applied The installation site of rust, welding slag, oil, dust and other debris clean up, and meet the ST2.0 standard, so that the surface of the coating without suspension, oil-free, water-free stains, dust-free, etc. ;
b) mechanical rust removal: the use of electric grinders or high-pressure water machinery and other equipment flushing, to meet the above requirements.
basic inspection: check cleanliness
for the attachment of more solid oxidizing skin, rust and other substances need to use anti-corrosion No. 1 for further treatment.
Anti-corrosion No. 1 construction (spraying, rolling, brushing)
a) after opening the barrel, the paint will be fully stirred for 2 to 3 minutes, to a uniform state (no steel bar stirring is strictly prohibited), if the selection of spray construction, the distance between the nozzle and the construction surface, in order not to produce a large number of paint mist, but also can spray the maximum area is appropriate, pre-construction test spray;
b) rust serious parts, need to be re-coated, that is, heavy rust re-painting,
c) if the use of brush coating, brushing should be used the principle of diligent, short brush, to prevent the brush with too much paint and fall;
d) If you need to work twice, you need to wait for the first drying, then brush the second time, the second brush direction should be perpendicular to the first brush direction, which will make the paint film thickness evenly consistent;
e) After work or work rest, should be spray gun, brush, etc. with clean water rinse clean, can also be spray gun, brush, etc. immersed in a plastic bucket filled with clean water, to avoid the paint solidified to block the gun or brush dry hard.
the construction of anti-corrosion No. 2 (spraying, rolling, brushing)
a) spraying or painting, the anti-corrosion No. 1 coating should be completely dry (dry), otherwise there will be a flow, uneven phenomenon;
b) after opening the barrel, the paint will be fully stirred for 2 to 3 minutes, to a uniform state
(no steel rod stirring is strictly prohibited), if the spray construction is selected, the distance between the nozzle and the construction surface, in order not to produce a large amount of paint fog, but also can spray the maximum area is appropriate, pre-construction test spray;
d) if the brush coating, brushing should be used the principle of diligent, short brush, to prevent the brush with too much paint and fall;
e) If you need to work twice, you need to wait for the first drying, and then brush the second time, the second brush direction should be perpendicular to the first brush direction, so that the thickness of the paint film will be uniform;
f) work or work rest. , spray guns, brushes, etc. should be rinsed with clean water, but also spray guns, brushes, etc. can be immersed in a plastic bucket filled with clean water, to avoid the paint solidified to block the mouth or brush dry hard.
construction
a) of anti-corrosion 3 opens the barrel, the paint is fully stirred to a uniform state (the use of steel rods is strictly prohibited);
b) the rest of the construction methods and precautions are the same.
rupover inspection
after each coating construction, the corner, side seam, horizontal hook, vertical hook, fan port, outstretched roof pipe, air conditioning pipe, metal plate and daughter wall junction, screw firmware and other steel structure roof waterproof weak link to be carefully examined, there are missing parts need to be re-coated.
note
a) must choose the appropriate weather conditions for construction, otherwise the coating will appear powder, cracking, rough and other phenomena;
b) If the grass-roots fail to clean up, after the construction of the coating surface will appear foaming, peeling, film failure and other phenomena, damage to coating performance;
c) before construction, should ensure that the substrate drying (steel wet, in the humidity of 70% of the climate, drying time should be greater than 12 hours), otherwise anti-rust phenomenon may occur;
d) If the same coating, the interval between the two constructions is longer, the paint needs to be stirred evenly again, otherwise the color difference may occur
e) open environment paint construction should avoid sun exposure, the next process of construction should be carried out after the material of the last construction.
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