Steel structure heavy anti-corrosion coating common coating ills and preventive measures.

At present, the steel structure heavy anti-corrosion coating construction is still mainly artificial construction operation, in the construction process, there will certainly be more or less there are some coating ills, the author of the steel structure heavy anti-corrosion coating in the main common coating ills for reason analysis, treatment and preventive measures analysis.
01 flow hanging
main causes: (1) spray gun is too close to the spray surface, or horizontal movement speed is too slow, or spray a single overlap too much, or nozzle wear too much, resulting in excessive local paint film; Small; (3) the applied surface (or the coating itself) temperature is too high, affecting the denaturation of the coating, or the applied surface (or the paint itself) temperature is too low, affecting the evaporation rate of solvents in the coating, so that the drying time is too long; (4) the coating's tentacles are not sufficient, leveling problems.
the
of the stream: the paint that produces the flow hook is polished flat, and the

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Corrective prevention: (1) the spray gun and the surface of the coating to maintain a suitable distance, control the speed of movement, reduce the number of overlaps of a single spray, timely replacement of worn nozzles, control the thickness of the paint film;
02 leakage
main reasons: self-test is not in place, the lack of responsibility of employees.
of the
: timely inspection, re-painting.
prevention: strengthen staff quality awareness education, improve the process self-test ability.
03 Obvious brush marks
the main causes: (1): when brushing, the paint sticks too much; (2) the brush hair is too hard or the brush is used many times, has been worn out; (3) after brushing, not timely leveling, dressing in place, (4) the surface temperature or ambient temperature is too high, solvent volatile speed is too fast, (5) paint flow performance is not good.
brush marks
treatment method: brush marks are serious, need to re-polish flatten, re-brush.
corrective prevention: (1) add the appropriate amount of thinner, adjust the brush viscosity, (2) replace the brush application tool in time, (3) correct operation, timely smoothing after brushing, (4) when the ambient temperature is higher than 35 degrees C, Do not apply outdoors, in indoor coating, conditional, can remove the wet mechanism cold function, reduce the ambient temperature or the surface temperature of the coating, while adding thinners to reduce its volatility speed, (5) contact technical services, according to the guidance, add suitable leveling agent.
04 Orange peel
main causes: (1) the ambient temperature (or the surface temperature of the coating) is too high, the solvent evaporates too fast; Improper operation, spray gun is too far away from the component, (4) spray pressure is too low or nozzle wear, resulting in poor paint atomization, (5) the paint itself is not smooth, in the paint film drying process, the internal fluidity of the coating stopped prematurely.
Orange Peel
Treatment: Slight orange peel, if the owner can accept the range, can be treated, the owner unacceptable orange peel or serious orange peel, must be polished with a grinder, and then repair.
corrective prevention: (1) reduce the ambient temperature (or surface temperature of the coating), or add the appropriate amount of solvent, reduce the viscosity of the coating, reduce the speed of solvent volatility of the coating; Training, adjustment and control of the appropriate spray distance, spray speed, (4) select the appropriate spray pressure, and replace the appropriate nozzle to ensure good atomization, (5) contact technical services to assist in the solution, according to the guidance, add the appropriate amount of leveling agent to improve the fluidity of the coating.05 The main causes of whitening of the coating surface
are: (1) the relative humidity is large, the coating is not dry, rain, fog or condensation and other moisture deposited on the surface of the coating that is not dry through;coating surface whitening
treatment method: (1) slightly whitening, with water (or warm water) wipe removal, or a small area of the use of thinner wipe removal, (2) serious whitening, the need to use sandpaper polishing or hair treatment, and remove the paint film surface of the white layer, and then re-spray.
corrective prevention: (1) control the relative humidity of the construction, after the coating is dry, and then move out, or avoid moisture deposition before the coating is not dried out, (2) the coating dilution moderate amount, (3) the correct coating ratio.
06 Pinhole
main causes: (1) the closed coating is too thick, resulting in primers, especially inorganic zinc-rich primer void air and solvents can not be discharged in time, in the subsequent coating curing process, the temperature rises, rapid volatilization, resulting in the coating rupture, pinholes; The solvent is not balanced properly, or the wrong solvent is used, resulting in the evaporation of a solvent at some stage in the drying process too quickly, (3) spray equipment problems, resulting in excessive or low atomization, resulting in pinholes, (4) the paint itself, poor leveling, (5) the surface is not clean, there is dirt.
pinhole
treatment method: mechanical grinding, the pinhole polished flat, and then repair;
Corrective prevention: (1) control the thickness of the closed coating, the thickness of the general closed paint is controlled at about 30 to 50 m, to ensure that the air in the primer gap and the thinner evaporates and discharges in a timely manner;
07 Chroma
main causes: (1) paint equipment or brushes used (rollers) residual unwashed paint;
color difference
method: sandpaper, cleaning, reapplying.
Corrective Prevention: (1) ensure that tools such as paint equipment or brushes are clean, (2) paint adjusts viscosity, needs to be added with correct, clean thinners, (3) correct paint, correct ratio and mixing, (4) notify technical services to assist in handling.
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