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Definitions for corrosion classification
As an aid in finding what requirements should be made for pre-treatment, we can define different corrosion classification: Corrosion Class 0 Indoors with relative humidity over 60% Very little corrosion risk (aggressivity) CORROSION CLASS 1 Indoors in non-heated, well ventilated room Little corrosion risk (aggressivity) Corrosion Class 2 Indoors with fluctuating temperature and humidity. Outdoors in inland climates, far from sea and industry. Medium corrosion risk (aggressivity) CORROSION CLASS 3 In densely populated areas or near industrial areas. Above open waterRead More …
Filiform corrosion is special kind of corrosion appearing mostly on aluminum
Filiform corrosion is special kind of corrosion appearing mostly on aluminum. The phenomenon resembles a worm creeping under the coating, always starting from a cut edge or a damage in the layer. Filiform corrosion develops easily when the coated object is exposed to salt in combination with temperatures 30/40°C and relative humidity 60-90%. This problem is therefore limited to coastal areas and linked with unfortunate combination of aluminum alloys and pre-treatment. To minimize filiform corrosion it is advised to ensure aRead More …
Phosphate treatment for powder coating
Iron phosphate Treatment with iron phosphate (often called thin layer phosphating) provides very good adhesion properties and has no adverse effects in the mechanical properties of the powder coating. Iron phosphate provides good corrosion protection for exposure in the low and middle corrosion classes, though it cannot compete with zinc phosphate in this respect. Iron phosphate can be used in either spray or dip facilities. The number of steps in the process may vary from 2-7, depending on the basemetalRead More …
Comparison of Cyclone recycling and Filter recycling in powder coating manufacturing
Cyclone recycling Simple construction. Simple cleaning. Effectiveness of separation depends to a large extent on operating conditions. Can produce considerable waste. Filter recycling All powder is recycled. Accumulation of fine-grained particles. May produce problems with spraying process, particularly with friction charging. Extensive cleaning: filter change requirement between colors.
A major advantage of powder coatings over liquid paint-reuse overspray powder
A major advantage of powder coatings over liquid paint systems is the ability to reuse powder that does not adhere to an object (overspray). Air and powder are separated by either a cyclone or a filter system, as illustrated. Powder that is recycled will be recollected in the powder hopper. Particles which are more easily charged adhere themselves to the object whilst the proportion being recycled are of another particle distribution size than that of virgin powder. The relationship betweenRead More …
Powder coating line with dip-pre-treatment
The coating line is equipped with two moveable spray-booths. Allows easy and fast color changes. Curing is done in tunnel oven. Pre-treatment by dip immersion; chromating and/or phosphating process is usually employed. Typical coating line when coating long items, i.e. extrusions or larger sheets.
Automatic powder coating line application
Automatic Powder coating line with one booth, typical equipment used on large series in one color. Pre-treatment is either iron or zinc phosphating. The curing takes place in a U-TURN oven. The coating line is equipped with the Jotun Powder Coatings “Big Bag” system.
POWDER COATING BY MANUAL APPLICATION
Powder coating is done by a small handgun, ideal for smaller components and mixed goods. Pre-treatment can be done – as shown- by blast cleaning or any other method suited for the finished product. Curing takes place in a box oven
D5 Creation