Specific characteristics metallics | Axalta Powder Coatings

Identification	Possible cause	Remedial action
From insufficient film thickness to finely textured surface	Insufficient deposition	Increase high voltage, check spray nozzles
	Output of powder too low	Increase powder flow
	Blowing-off effect	Reduce amount of air
	Flow of powder too high, together with low application voltage	Reduce powder output, increase voltage
	Insufficient charging during tribo application	Use appropriate charging method (corona charging)

Identification	Possible cause	Remedial action
"greying", missing metallic effect	Wrong or different charging procedure, hence a different alignment of metal effect pigments	Corona charging recommended, standard application procedures need to be used for each powder
Objects do not match in terms of colour or effect	Powder being used is not correctly bonded and cannot be reclaimed; results in separation of powder base and metal effect pigments	Use powder that can be reclaimed (bonded), ensure that the ratio of virgin powder to reclaim meets the powder manufacturers recommendations; motto "Stop messing about with half measures, and do the thing properly."
		Use powder "spray to waste" (costs, disposal)
	Batch change during a job	Use same batch of powder during a single job
	Powder separating in powder hopper	Use fluidised bed hopper to avoid partial separation
Objects do not match in terms of colour or effect	Colour differences between automatic and manual coating process	If possible, do not use manual coating after automatic application but do any manual coating prior to automatic application
	Different substrates	Produce colour standard and colour tolerance standards for different substrates
	"Differences" with the customer regarding the colour	Agree upon colour standard and agree tolerances confirmed by standard panels

Identification	Possible cause	Remedial action
Appearance of irregular light dark effects on substrate	Wrong space between sprayguns, different charging, improper sine curve, insufficient earthing	Optimise coating plant parameters
	Obviously different film thicknesses	Minimise variations in film thickness
	Automatic coating process with subsequent manual application	Use manual pre-coating where manual reinforcement is required

Checklist for a problem-free powder coating process