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2009 Powder Coating Forum Set to Launch in September

The 2009 Powder Coating Forum is set to take place at the Embassy Suites in Cleveland, Ohio, from Sept. 16–17.

The 2009 Powder Coating Forum, which is sponsored by Cytec, Elcometer, and the Powder Coating Research Group, targets a wide range of attendees. Among them: coating formulators, raw materials suppliers, distributors, engineers, quality control managers, etc. Day one includes powder coating formulation basics as well as a live lab demonstration. Day two entails an emerging trends and technology symposium. Early-bird registration fees (before Aug. 17) are $395 for the full two-day program; a one-day pass is $245. Please see the full schedule to learn more about the event.
 

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bivek said

27 March 2011
Metal powder coating

Powder coating is by far the youngest of the surface finishing techniques in common use today. It was first used in Australia about 1967.

Powder coating is the technique of applying dry paint to a part. The final cured coating is the same as a 2-pack wet paint. In normal wet painting such as house paints, the solids are in suspension in a liquid carrier, which must evaporate before the solid paint coating is produced.In powder coating, the powdered paint may be applied by either of two techniques.The item is lowered into a fluidised bed of the powder, which may or may not be electrostatically charged, or
The powdered paint is electrostatically charged and sprayed onto the part. The part is then placed in an oven and the powder particles melt and coalesce to form a continuous film.There are two main types of powder available to the surface finisher:

Thermoplastic powders that will remelt when heated, and
Thermosetting powders that will not remelt upon reheating. During the curing process (in the oven) a chemical cross-linking reaction is triggered at the curing temperature and it is this chemical reaction which gives the powder coating many of its desirable properties.
Preparation. The basis of any good coating is preparation. The vast majority of powder coating failures can be traced to a lack of a suitable preparation.The preparation treatment is different for different materialsOils and greases are removed in weak alkali or neutral detergent solutions and the surface is etched to remove heavy oxides. After rinsing, the aluminium is dipped into a chromate or phosphate solution to form a conversion coating on the aluminium. This film is chemically attached to the aluminium. After rinsing the aluminium is finally rinsed in demineralised water. Some non-chrome, dried in place pretreatment is beginning to come onto the market; currently, these are not recommended for exterior applications.Oils and greases are removed in weak alkali or neutral detergent solutions and the surface is etched to remove heavy oxides. After rinsing, the aluminium is dipped into a chromate or phosphate solution to form a conversion coating on the aluminium. This film is chemically attached to the aluminium. After rinsing the aluminium is finally rinsed in demineralised water. Some non-chrome, dried in place pretreatment is beginning to come onto the market; currently, these are not recommended for exterior applications.
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