Common problems and corresponding measures when applying powder coating

First, the paint film color change
the cause:
1.
residual treatment fluid on the surface of the coating.
2.
too much baking, or there is a volatile gas in the oven.
3.
powder mixed with other colors in the construction of the
chinese
.
4.
the powder itself is not resistant to high temperatures or the resin is prone to yellowing.
solution:
1.
improved pre-processing methods.
2.
conditions and purify the oven by setting the appropriate baking conditions.
3.
to strengthen the pre-construction clean-up.
4.
can be replaced with a qualified powder coating.
, the surface of the coating film has particles
the cause:
1.
the surface of the coated work piece is not
2.
supply of powder is not equal, spray gun atomization is not good.
3.
powder is too fine or the powder is moisture-thyme, so that the spray gun powder.
4.
the coating site is not clean or powder drops in the spray room.
5.
the recycled powder or the powder itself is of poor quality.
solution:
1.
the quality of the workware substrate and strengthen the pre-treatment.
2.
air pressure, check the pilot and adjust to the optimum point.
3.
control the particle size distribution of the powder, keep the powder safe, strictly prevent moisture.
4.
clean up the site and purify the air.
5.
the recycled powder after screening the new powder mixed use, replace the qualified powder.
, the reason for the
:
1.
oil on the surface of the work piece.
2.
, oil, etc. in compressed air, resulting in contamination of the powder.
3.
is contaminated with dust or other impurities
4.
powder coating itself has a
solution:
1.
to strengthen pre-processing.
2.
to enhance the purification of compressed air before coating.
3.
clean up the environment thoroughly and replace the qualified powder.
four, poor flow or orange peel serious
cause:
1.
the surface of the work piece is rough.
2.
powder particles are coarse, moistureed, or the powder level itself is
3.
cure temperature is high or low
4.
film is too thin or too thick.
5.
work piece is not well grounded.
6.
different powders are mixed.
solution:
1.
improve the finish of the work piece.
2.
select high-quality powders with uniform particle size distribution and good leveling, and strictly prevent moisture.
3.
the appropriate curing conditions should be adjusted.
4.
control powder thickness is
60-80
μ
m
.
5.
to clean the hanger regularly.
6.
cleaning powder system and site before construction, to avoid different types or different manufacturers of powder mixing.
, coating surface loss of light
the cause:
1.
quality of the pre-treatment of the substrate is poor.
2.
bake for too long or at too high a temperature.
3.
volatile gas in the furnace.
4.
use of recycled powder is too large.
5.
are mixed with two powders of different properties.
6.
powder coatings are of poor quality.
solution:
1.
a suitable pre-treatment process.
2.
the appropriate curing conditions should be adjusted.
3.
clean the oven.
4.
the recycled powder is filtered and mixed with the new powder to <
30%
the new powder.
5.
clean the powder system thoroughly before changing the powder.
6.
replace the powder of good quality.
, the coating film has pores, pinholes
the cause:
1.
holes in the surface of the work piece.
2.
the surface of the work parts have treatment residue, skimming, rust prevention is not thorough.
3.
the conductive putty is too thick to dry out.
4.
gun is too close to the work piece, the construction voltage is too high, resulting in the coating to break through.
5.
gas in the oven.
6.
coating is too thick, or the coating is not fully cured.
7.
the problem of powder coatings
:
1.
the processing of work parts should be strengthened.
2.
improve the pre-treatment process.
3.
extend the baking time.
4.
the process parameters.
5.
the oven and purify the gas in the furnace.
6.
control the thickness of the coating film to
50
-
80
μ
m
, adjust the curing conditions.
7.
can be replaced with qualified powder
.
, the mechanical performance of the coating film is poor, the whole coating block falls off
the cause:
1.
quality of the substrate is poor, the pre-treatment method is not proper.
2.
baking conditions are not proper, curing is incomplete or over-baking.
3.
powder is of poor quality or has exceeded its shelf life.
solution:
1.
improved pre-treatment.
2.
determine the right baking process.
3.
the selection of qualified powder, over-time need to be fully checked.
, coating corrosion resistance is poor
the cause:
1.
coating film is not fully cured.
2.
oven is uneven in temperature and has a large temperature difference.
3.
work is not handled properly.
4.
powder coatings have poor
.
solution:
1.
the baking conditions according to the paint performance.
2.
choose the right oven, the temperature difference between the upper and lower ±
5
degrees C.
3.
the pre-treatment to avoid residual treatment fluid on the surface of the work piece.
4.
qualified powder coatings should be replaced.
9, powder fly adsorption difference
cause:
1.
static generator is not generated with high voltage or is insufficiently high voltage.
2.
work piece is not well grounded.
3.
pressure is too high.
4.
recovery device has a blocked stroke channel.
5.
treatment is not thorough (rust, oil).
6.
the problem of powder coatings
:
1.
check the static generator and adjust the voltage.
2.
to clean the hanger and stay grounded.
3.
adjust the air pressure.
4.
clean the recycling unit.
5.
to strengthen the pre-treatment process.
6
. Use qualified powder coatings
.
10, the supply of uneven amount of powder when high and low
cause:
1.
powder control department blocked, powder flow is poor.
2.
air pressure is insufficient and the pressure is unstable.
3.
mixed with oil and water in the air.
4.
the powder feeder fluidization is unstable, the powder feeder powder is too small.
solution:
1.
the powder tube debris or lumps, keep the powder tube open, adjust the powder coating dry powder flow
2.
choose the right air compressor.
3.
oil and water from the air compressor are ruled out on a timely day.
4.
the fluidized bed air pressure is stable and adds new powder on a timed day.