In order to achieve the best spraying effect of die casting parts, we suggest that some special treatment should be carried out when spraying powder coating for die casting 1. The workpiece is pretreated and pre baked; 2. Use sealing liquid (or professional primer) for primer, and try to make the coated workpiece smooth and flat without micro pores on the surface; 3.Spray and bake the surface.
Powder coating for die casting
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The powder coating for die casting is a kind of coating, which is specially produced to solve the problems in the spraying of die casting parts.
In the metal work pieces coated with powder coating, some materials, such as castings (iron, aluminum), hot-rolled steel plates, galvanized steel, etc., have rough surface and micro pores, which makes the film prone to pores. The formation mechanism is that during the baking and curing process of the powder coating, the workpiece is in a closed state at the melting level, which makes the melting level coating arched, resulting in poor flatness of the coating surface.
In order to achieve the best spraying effect of die casting parts, we suggest that some special treatment should be carried out when spraying powder coating for die casting
1. The workpiece is pretreated and pre baked;
2. Use sealing liquid (or professional primer) for primer, and try to make the coated workpiece smooth and flat without micro pores on the surface;
3. Spray and bake the surface.
Physical properties of powder coating for die casting
Proportion: 1.4-1.7, depending on color and gloss
Granularity:
100% less than 100 μ m, please inform in advance if you have special requirements
Mobility : 120-140
Coating Performance of powder coating for die casting
Coating performance |
Performance |
Testing standard |
Test results |
|
Gloss 60° |
|
GB/T9754-88 |
1°-95° |
|
Impact test |
ISO6272 |
GB/T1723-1993 |
50cm/kg |
|
Cupping test |
ISO1520 |
GB/T9753-1988 |
8mm |
|
Adhesion |
ISO2409 |
GB/T 9286-1998 |
Grade 0 |
|
Bending test |
ISO1519 |
GB/T 6742-1986 |
2mm |
|
Pencil hardness |
ASTMD3363 |
GB/T 6739-1996 |
1H-2H |
|
Salt spray test |
ISO7253 |
GB/T 1771-1991 |
>500h |
|
Moisture resistance |
ISO6270 |
GB/T 1740-1979 |
>1000h |
|
Heat resistance |
110℃/24h (white) |
Excellent gloss retention △E≤0.3-0.5 |
||
Note: 1. The above test is completed with a 0.8mm thick rust-removing and oil-removing cold-rolled steel plate under the experimental conditions, and the coating thickness is about 70μm; |
Construction Conditions of powder coating for die casting
Curing Conditions |
Standard Curing |
180℃ (Temperature of Workpiece) 15-20min |
Low temperature curing |
160℃(Temperature of Workpiece) 15min |
|
Fast curing |
200℃(Temperature of Workpiece) 3min |
|
Pretreatment |
Different pretreatment for different substrates (phosphating, sandblasting, shot peening) |
|
Spraying |
Corona electrostatic spraying, if special spraying method is used, please inform in advance |
|
Theoretical coverage |
In 8-10 square meters / kg, the film thickness is 60 microns, which varies with the type and color |
|
Application |
Indoor |
Packaging and transportation of powder coating for die casting
25kg / box, carton lined with polyethylene plastic bag, non dangerous goods, can be transported in various ways, but should avoid direct sunlight, moisture and heat, avoid contact with chemical substances