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Advantages and disadvantages of powder coating

There are several advantages of powder coating over conventional liquid coatings:
Powder coatings emit zero or near zero volatile organic compounds (VOC).
Powder coatings can produce much thicker coatings than conventional liquid coatings without running or sagging.
Powder coating overspray can be recycled and thus it is possible to achieve nearly 100% use of the coating.
Powder coating production lines produce less hazardous waste than conventional liquid coatings.
Capital equipment and operating costs for a powder line are generally less than for conventional liquid lines.
Powder coated items generally have fewer appearance differences between horizontally coated surfaces and vertically coated surfaces than liquid coated items.
A wide range of specialty effects is easily accomplished which would be impossible to achieve with other coating processes.
While powder coatings have many advantages over other coating processes, there are limitations to the technology. While it is relatively easy to apply thick coatings which have smooth, texture-free surfaces, it is not as easy to apply smooth thin films. As the film thickness is reduced, the film becomes more and more orange peeled in texture due to the particle size and TG (glass transition temperature) of the powder.
For optimum material handling and ease of application, most powder coatings have a particle size in the range of 30 to 50 μm and a TG > 40° C. For such powder coatings, film build-ups of greater than 50 μm may be required to obtain an acceptably smooth film. The surface texture which is considered desirable or acceptable depends on the end product. Many manufacturers actually prefer to have a certain degree of orange peel since it helps to hide metal defects that have occurred during manufacture, and the resulting coating is less prone to show fingerprints.
There are very specialized operations where powder coatings of less than 30 micrometres or with a TG < 40° C are used in order to produce smooth thin films. One variation of the dry powder coating process, the Powder Slurry process, combines the advantages of powder coatings and liquid coatings by dispersing very fine powders of 1–5 micon particle size into water, which then allows very smooth, low film thickness coatings to be produced.
Powder coatings have a major advantage in that the overspray can be recycled. However, if multiple colors are being sprayed in a single spray booth, this may limit the ability to recycle the overspray.

Powder Coating the PAINT TECHNIQUE that is ABOVE the REST by Maricon Williams

The paint can make and unmake the looks of your motorcycle. A wrong choice of paint can make you the laughing stock of your rider's club. So be very careful in choosing your motorcycle paint.

Have you ever heard of powder coating? Do you have any idea just what it is? Well if you don't, then this article is just what you need. Powder coating is one of the best painting technique out there however not everybody is aware of it. In powder coating the preparation is very important if you want to have the best paint job results. The preparation includes the stripping of the motorcycle parts of all its paint. It is very important that the motorcycle parts to be coated must be entirely stripped of any remaining paint, dirt, oil and any other substance. Sandblasting is required to completely clean the motorcycle parts. Afterwards, the motorcycle parts are going to be baked to get rid of the moisture from the metal. The motorcycle parts are now treated with degreasing solution to prevent from rusting.

The process of powder coating is used especially for selected motorcycle parts in which they are coated with fine powder of resin as well as pigment which is more of a ground up paint grains that form a powder-like substance. The items being coated are then hanged on a rack which grounds the item. A spray gun is then used to spray the powder onto the motorcycle parts. Afterwards, spraying on the motorcycle parts, these are then baked on a large oven in order to cure the coating. The usual temperature used for curing is between 400 and 450 degrees. Another purpose of curing and baking the motorcycle parts is to melt the pigments, melt the gel in order to come up with a hard-wearing finish. The end product is an even coating.

Powder coating can also be applied to steel, zinc, aluminum as well as to some other materials. The great thing about powder coating is that it has the ability to withstand and surpass the originally painted parts of your motorcycle. And aside from that, there are also hundreds of colors to choose from. Likewise, powder coated motorcycle parts can also withstand acids, solvents, impacts and even abrasions.

The process of powder coating can be used to paint items including valve covers, wheels, trim parts, sway bars, bumpers, coil springs, strut bars as well as other items. For those who are interested there are online as well as offline powder coating companies that you may turn to. The usual thing required is for you to either shipped mail or bring personally the part or the item of your motorcycle or even your car parts that you want to have powder coated.

About the Author

For Comments and Questions about the Article you may Log - on to http://www.yamahamotorcyclepartsonline.com

Core Coatings is regularly updated for more powder coating related equipment and supplies so please check back often!

Powder coatings are a type of dry coating, which is applied as a free-flowing, dry powder that has been fluidized to conduct a positive electrical charge usually with air pressure assistance. Conventional liquid paint and a powder coating differs in that the powder coating does not require any solvents as do many automotive VOC paints. The coating is typically applied electro statically or using a wet solution applied with an hvlp gun, and is then cured with heat using an Industrial Powder Coating Oven, Or a powder Coating oven or infrared heat lamp to allow it to "flow out" when the base metal material reaches the specified melting temperature. The powders may be a thermoplastic or a thermo set polymer. Powder Coating is used to create a hard finish that is tougher and less scratch resistant than regular conventional paints. Powder coating used to be used mainly for coating of metals, such as "white metals", aluminum extrusions, and car and bike parts. Newer technologies allow other materials, such as Cardboard, Wood, And virtually anything to be powder coated with newer curing options other than powder coating ovens. Keep an eye on Core Coatings as we show some new powder coating technologies in the near future.

Tips For Powder Coating

Powder coating is the youngest of the surface finishing techniques that is still in use today. It was first used in 1967 in Australia by Allan Davies.

Powder coating is the simple technique of applying dry paint to a part such as metal or plastic, and after the final coating is the same as a finished 2-coat wet paint job. Powder coating can be applied in two ways; either by lowering an item into a bed of powder which may or may not be electrically charged, or the powder paint is electrically charged and sprayed onto the part. After being coating with dry paint, the part is placed in an oven and the powder particles melt and combine to form a permanent layer of paint.

There are two main types of powder available to use, either the thermoplastic powder which re-melt when heated, and thermosetting powders that will not re-melt when heated. This is because during the initial heating process a chemical cross-linking reaction is triggered so that the bonds cannot be broken.

The foundation of any high-quality coating job is preparation. Most powder coating failures are linked to a poor preparation process. It is important to know that the preparation treatment is different for different materials.

For all applications the preparation treatment for aluminum is to clean, rinse, etch, chromate, rinse and denim rinse. Oils and greases can be removed by weak alkali or neutral detergent solutions and the surface is etched to remove heavy oxides. After rinsing, the aluminum is dipped into a chromate or phosphate solution to form a adaptation coating. After rinsing the aluminum it is rinsed in de-mineralized water which gets rid of chemical salts on the aluminums surface. This process has two functions which include giving the aluminum a surface which is better for adhesion and protects the aluminum from under the paint corrosion.

If you are preparing a steel part, the steps you take to prepare your part are as follows: clean, rinse, etch, rinse, grain refine, zinc phosphate, rinse and acidulated rinse. The grain refiner is used after acid cleaning of steel surfaces and before zinc phosphate, because otherwise the zinc phosphate coatings produced will be very coarse and have a low adhesion ability. The etch is required to remove the zinc corrosion products which begin to form almost immediately the zinc is removed from the galvanizing kettle. The grain refiner ensures a fine phosphate is produced.

Barney Garcia writes about many different topics. He is a proud contributing author and invites you to his websites. www.need-powder-coating.info and Powder Coating