Problems and solutions in the application of powder coatings

The baking temperature is too low or the time is too short

White powder will produce a color that is white and not yellow enough

Increased powder gloss

Impact, bending, adhesion, surface hardness of the coating film,

Poor chemical resistance and other performance

The difference between gas stove and diesel stove and electric stove

When the gas is baked, it is white, and the light gray powder is easy to use

The powder is yellowish and darker

Diesel furnace and electric furnace are relatively close to the laboratory effect

Common symptoms

The appearance of the customer sprayed product has particles

v cause

? Coating film is too thin

? The workpiece is not thoroughly cleaned

? Poor spraying environment

?The spraying operator wears fiber clothing or there are fibers on the surface of the workpiece

? There is no oil baffle on the suspension chain

The drying tunnel is not cleaned regularly or incorrectly

?The powder itself has particles

Judgment method

v Observe on-site product quality

v Understand the size, shape, quantity and distribution of shrinkage holes

v Pass the comparison test

There is shrinkage on the surface of the sprayed product of the customer

cause:

The substrate or powder is contaminated, which makes the local surface tension of the powder inconsistent

? Incomplete treatment before painting, including insufficient oil removal

? Environmental factors, such as suspension chain lubricating oil, compressed air oil

The water is not separated in time, and the drying effect is not good

? The quality of the powder itself

The powder penetration is poor and cannot reach the dead corner of the workpiece

cause

? Poor grounding between the equipment and the workpiece

The set voltage of the spray gun is too high, the powder

The powder output is too large or too small

The distance between the spray gun and the workpiece is too far or too close

The proportion of recycled powder used is too large

?Powder cause

Poor leveling and obvious orange peel

cause

? Coating is too thin

?The curing heating speed is too slow or the curing temperature and time are not enough

?Powder cause

There are pinholes on the coating surface

cause

? The coating is too thick

?The spray gun voltage setting is too high

? Poor grounding of spray equipment

The distance between the spray gun and the workpiece is too close

The powder is contaminated or damp, and the compressed air has more moisture

?The reason for the base material of the customer's workpiece

?Powder cause

(Source: Global Coatings Network) (For more information, please log in: Global Coatings Network http:// )