Pre-treatment of substrate
This series of products are applied to aluminum substrates, such as thin aluminum plate, die-casting aluminum, etc
First, degrease the surface, and then apply rubbing or sandblasting treatment to the surface with corundum
(80# ~ 120#) to make the surface roughness in the range of Rat2.0μ ~ 3.0μ . The last step is to clean and dedust.
Preparation of coating
Dispersion
Fully disperse the coating by stirring or rolling on a ball grinder before operation.
Stirring standard: Give a low-speed and uniform stirring (300 r/min ~ 900r/min) for 10 minutes, be sure there is
No bubble.
Rolling standard: Roll the coating for 40 minutes at the speed of 30r/min ~ 50r/min on the ball grinder.
Viscosity adjustmen
The viscosity can be adjusted according to different spraying methods, dilute the coating with water if the
Viscosity is over high.
Coating Filtration
Filtrate the coating with stainless steel or nylon filter net (100M ~ 150M) before using to get rid of impurities
Spraying of coating
Spraying method
Compressed air spraying is available. All general spray guns (pressure feed type, gravity feed type
And siphon type) could be used. The caliber of spray nozzle is Ø 0.8mm ~ 1.5mm, the spray head
Pressure is 1.50kgf/cm² ~ 4.0kgf/cm² . The spray gun should keep a certain distance from
Workpiece in accordance with the spraying environment and coating properties.
Spraying process
The spraying environment should be dry, well-ventilated, no smoking and fire.
Air compressor should be degreased, dewatered and equipped with decantor before using.
Adjust atomization and oil pump capacity of the spraying gun, make sure the workpiece is clean
And level.
Basecoat spraying: Heat the substrate to about 350C before spraying basecoat.
Basecoat film thickness: 15μ M ~ 18μ M; Drying temperature: 120° C; Drying time: L0min ~ 20min.
Topcoat spraying: Spraying the topcoat after drying and cooling down the basecoat to normal
Temperature;
Topcoat film thickness: 8μ M ~ 12μ M; Drying temperature: 120° C ~ 150° C; Drying time: L0min ~ 15min.
Film curing
Set temperature within the drying oven (or tunnel drier) at 120° C ~ 150° C. Keep the sprayed
Workpiece in for l0min ~ 15min, then slowly increase the temperature to 380° C ~ 400° C and keep
For another 5min ~ l0min.
Please kindly note that both higher beginning temperature and rapid temperature increasing
Could lead to blister of film.
Besides, drying oven (or tunnel drier) should be well-ventilated, otherwise, the discoloration
Will occur.
Adjust the holding time according to the size of substrate and heat-transfer ability of the material
During curing or sintering process.
Cool down the workpiece
Water cooling, natural cooling and air cooling are all available.
Storage of coating
The storage place should be dry and well-ventilated. Avoid direct sun exposure,
And keep away from the source of ignition and heat. The storage temperature should
Be between 10° C ~ 30° C. Have a weekly shake on the ball grinder ( 30rpm ~ 50rpm *
15min ~ 30min ). Never make it freeze in winter.
The shelf life of the coating is 6 months.
Physico-chemical Parameters
ModelBasecoat
W8602-2001Topcoat
W8602-3002Test method
Solid content, %31± 140± 1220° C × 30min
Density, g/mL1.2± 0.11.3± 0.1Specific gravity cup
Viscosity, ( 25° C ) CP600 ~ 800300 ~ 500Rotational viscosimeter
AppearanceFlash blackEyeballing
Gloss15 ~ 2060° Gloss meter
SubstrateDie-casting aluminum/
Sintering temperature380° C × 10min/
Film thickness, μ 23 ~ 30Coating-thickness gauge
HardnessHZHONGHUA pencil
Normal temperature
pH value7 ~ 10pH meter
Adhesion100/100
Audited Supplier 
){kind=link}